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What is your fuel consumption?
Guys,
I am thinking about getting a harbercraft jetboat ... these things are made from aluminum and have the 175 HP Mercury sportjet.. So far so good ... Now what raises the fuel warning flag are the terms: - jet - 2 stroke - carburator (two of them ;) The boat will burn about 5 gallons per hour at 30 mph... now I was wondering how this compares to a similar sized fiberglass hboat with 115-150 HP 4 Stroke outboard.. What is the fuel you burn at cruise speed and WOT, whats your boat size/weight and what motor are you running .. I am interested in how the relatively light alu jetboat compares to a more conventional boat with 4 stroke motor.. Any info is appreciated :) Matt |
What is your fuel consumption?
I run a Jetcraft 21' Bluewater and get about 1.75-2 mpg depending on
throttle opening. Mostly WOT. You might also look at the Willy boats Predator. It is also a Sportjet powered boat. I have heard that the Harbercraft's are not as good as the former Jetcraft's (they bought jetcraft and moved it to BC). Call Willy boats and ask them. Mine is a 1991 Kodiak pump, but I understand the newer Hamilton's are about 95% of a prop boat now. Bill "Matt Lang" wrote in message om... Guys, I am thinking about getting a harbercraft jetboat ... these things are made from aluminum and have the 175 HP Mercury sportjet.. So far so good ... Now what raises the fuel warning flag are the terms: - jet - 2 stroke - carburator (two of them ;) The boat will burn about 5 gallons per hour at 30 mph... now I was wondering how this compares to a similar sized fiberglass hboat with 115-150 HP 4 Stroke outboard.. What is the fuel you burn at cruise speed and WOT, whats your boat size/weight and what motor are you running .. I am interested in how the relatively light alu jetboat compares to a more conventional boat with 4 stroke motor.. Any info is appreciated :) Matt |
What is your fuel consumption?
Calif Bill wrote:
I run a Jetcraft 21' Bluewater and get about 1.75-2 mpg depending on throttle opening. Dang, we measure fuel in gallons per hour (1.75 on our last trip). Of course, we burn diesel and only go about 8 knots. Speed costs! Fair Skies Doug King |
What is your fuel consumption?
"Matt Lang" wrote in message om... now I was wondering how this compares to a similar sized fiberglass hboat with 115-150 HP 4 Stroke outboard.. I don't know about 4 strokes but I believe there was a rule of thumb that said for 2 stroke outboards they would burn about 10% of their rated horsepower at WOT. So a 115 HP would burn somewhere around 11 gallons per hour @ WOT. Though I may be wrong.... |
What is your fuel consumption?
1985 Bayliner 1952 cuddy
18.5' fiberglass 'modified V' hull 19.5' Length over all 2200 lbs dry weight 1985 Volvo Penta AQ125B 4 cyl 105 hp 4 stroke 1 barrel Solex carb 35 mm Volvo Penta 270 Stern drive 14 X 19 modified SS 3-blade prop (14 X 21 effective) StingRay Hydrofoil 35 mph WOT @ 4800 RPM 32 mph cruise @ 4400 RPM Premium unleaded fuel (92 octane) 4 adults & 1 dog, ski equipment, coolers, etc- 6-7 gph WOT 5 gph cruise "Matt Lang" wrote in message om... Guys, I am thinking about getting a harbercraft jetboat ... these things are made from aluminum and have the 175 HP Mercury sportjet.. So far so good ... Now what raises the fuel warning flag are the terms: - jet - 2 stroke - carburator (two of them ;) The boat will burn about 5 gallons per hour at 30 mph... now I was wondering how this compares to a similar sized fiberglass hboat with 115-150 HP 4 Stroke outboard.. What is the fuel you burn at cruise speed and WOT, whats your boat size/weight and what motor are you running .. I am interested in how the relatively light alu jetboat compares to a more conventional boat with 4 stroke motor.. Any info is appreciated :) Matt |
What is your fuel consumption?
Stanley Barthfarkle wrote:
1985 Bayliner 1952 cuddy 18.5' fiberglass 'modified V' hull 19.5' Length over all 2200 lbs dry weight 1985 Volvo Penta AQ125B 4 cyl 105 hp 4 stroke 1 barrel Solex carb 35 mm Volvo Penta 270 Stern drive 14 X 19 modified SS 3-blade prop (14 X 21 effective) StingRay Hydrofoil 35 mph WOT @ 4800 RPM 32 mph cruise @ 4400 RPM Premium unleaded fuel (92 octane) 4 adults & 1 dog, ski equipment, coolers, etc- 6-7 gph WOT 5 gph cruise 5 MPG at WOT ! Wow, there are some RV owners that would like to do that well at any speed... Rob |
What is your fuel consumption?
Dang, how do you get so much speed out of your little Volvo engine? I
have a newly rebuilt AQ130C ( 4 cyl. 130 hp) and it only takes my boat up to 31 mph at WOT, about 5000 rpm with two adults in it. My boat is a 17' fiberglass v-hull and weighs about 2000 lbs I would guess, and has a Volvo 270 outdrive on it. BTW, it consumes just 3-4 gph at cruise speed (4200 rpm, 27 mph). Bob Stanley Barthfarkle wrote: :1985 Bayliner 1952 cuddy :18.5' fiberglass 'modified V' hull :19.5' Length over all :2200 lbs dry weight :1985 Volvo Penta AQ125B 4 cyl 105 hp 4 stroke :1 barrel Solex carb 35 mm :Volvo Penta 270 Stern drive :14 X 19 modified SS 3-blade prop (14 X 21 effective) :StingRay Hydrofoil :35 mph WOT @ 4800 RPM :32 mph cruise @ 4400 RPM : :Premium unleaded fuel (92 octane) :4 adults & 1 dog, ski equipment, coolers, etc- :6-7 gph WOT :5 gph cruise : : : :"Matt Lang" wrote in message . com... : Guys, : : I am thinking about getting a harbercraft jetboat ... these things are : made from aluminum and have the 175 HP Mercury sportjet.. : : So far so good ... Now what raises the fuel warning flag are the : terms: : : - jet : - 2 stroke : - carburator (two of them ;) : : The boat will burn about 5 gallons per hour at 30 mph... now I was : wondering how this compares to a similar sized fiberglass hboat with : 115-150 HP 4 Stroke outboard.. : : What is the fuel you burn at cruise speed and WOT, whats your boat : size/weight and what motor are you running .. : : I am interested in how the relatively light alu jetboat compares to a : more conventional boat with 4 stroke motor.. : : Any info is appreciated :) : : : Matt : : |
What is your fuel consumption?
"DSK" wrote in message ... Calif Bill wrote: I run a Jetcraft 21' Bluewater and get about 1.75-2 mpg depending on throttle opening. Dang, we measure fuel in gallons per hour (1.75 on our last trip). Of course, we burn diesel and only go about 8 knots. Speed costs! Fair Skies Doug King Speed is addictive. Why I drove a Corvette when I raced sports cars. |
What is your fuel consumption?
trainfan1 wrote:
Stanley Barthfarkle wrote: 1985 Bayliner 1952 cuddy 18.5' fiberglass 'modified V' hull 19.5' Length over all 2200 lbs dry weight 1985 Volvo Penta AQ125B 4 cyl 105 hp 4 stroke 1 barrel Solex carb 35 mm Volvo Penta 270 Stern drive 14 X 19 modified SS 3-blade prop (14 X 21 effective) StingRay Hydrofoil 35 mph WOT @ 4800 RPM 32 mph cruise @ 4400 RPM Premium unleaded fuel (92 octane) 4 adults & 1 dog, ski equipment, coolers, etc- 6-7 gph WOT 5 gph cruise 5 MPG at WOT ! Wow, there are some RV owners that would like to do that well at any speed... Rob 2003 Parker 2520XL Yamaha 225 four stroke About 32' overall (pulpit and transom bracket) About 6500 pounds with engine, half tank of fuel, stuff 39+ mph at 6000 rpm, WOT 20 gph 24-25 mph at 4100-4300 rpm, 10 gph Because of the incessant hard chop on Chesapeake Bay, I usually run at 20-22 knots, keeping gph under 10. I watch the fuel flow meter more than anything else. |
What is your fuel consumption?
What prop are you using? Do you have a Sting Ray Hydrofoil? If not, get
one. Boat planes better, and it allows use of a higher pitched prop (14 X 21 SS cupped in my case). Less cavitation, and no "rooster tail"- energy that would have been wasted with a rooster tail is sent rearward, increasing propulsion. "Bob" wrote in message ... Dang, how do you get so much speed out of your little Volvo engine? I have a newly rebuilt AQ130C ( 4 cyl. 130 hp) and it only takes my boat up to 31 mph at WOT, about 5000 rpm with two adults in it. My boat is a 17' fiberglass v-hull and weighs about 2000 lbs I would guess, and has a Volvo 270 outdrive on it. BTW, it consumes just 3-4 gph at cruise speed (4200 rpm, 27 mph). Bob Stanley Barthfarkle wrote: :1985 Bayliner 1952 cuddy :18.5' fiberglass 'modified V' hull :19.5' Length over all :2200 lbs dry weight :1985 Volvo Penta AQ125B 4 cyl 105 hp 4 stroke :1 barrel Solex carb 35 mm :Volvo Penta 270 Stern drive :14 X 19 modified SS 3-blade prop (14 X 21 effective) :StingRay Hydrofoil :35 mph WOT @ 4800 RPM :32 mph cruise @ 4400 RPM : :Premium unleaded fuel (92 octane) :4 adults & 1 dog, ski equipment, coolers, etc- :6-7 gph WOT :5 gph cruise : : : :"Matt Lang" wrote in message . com... : Guys, : : I am thinking about getting a harbercraft jetboat ... these things are : made from aluminum and have the 175 HP Mercury sportjet.. : : So far so good ... Now what raises the fuel warning flag are the : terms: : : - jet : - 2 stroke : - carburator (two of them ;) : : The boat will burn about 5 gallons per hour at 30 mph... now I was : wondering how this compares to a similar sized fiberglass hboat with : 115-150 HP 4 Stroke outboard.. : : What is the fuel you burn at cruise speed and WOT, whats your boat : size/weight and what motor are you running .. : : I am interested in how the relatively light alu jetboat compares to a : more conventional boat with 4 stroke motor.. : : Any info is appreciated :) : : : Matt : : |
What is your fuel consumption?
BTW- if your Volvo AQ130 is like my AQ125, it isnt 130 hp. My "125" is
actually 105 hp effective. I'll wager that other Volvo engines are similarly mis-labeled. "Bob" wrote in message ... Dang, how do you get so much speed out of your little Volvo engine? I have a newly rebuilt AQ130C ( 4 cyl. 130 hp) and it only takes my boat up to 31 mph at WOT, about 5000 rpm with two adults in it. My boat is a 17' fiberglass v-hull and weighs about 2000 lbs I would guess, and has a Volvo 270 outdrive on it. BTW, it consumes just 3-4 gph at cruise speed (4200 rpm, 27 mph). Bob Stanley Barthfarkle wrote: :1985 Bayliner 1952 cuddy :18.5' fiberglass 'modified V' hull :19.5' Length over all :2200 lbs dry weight :1985 Volvo Penta AQ125B 4 cyl 105 hp 4 stroke :1 barrel Solex carb 35 mm :Volvo Penta 270 Stern drive :14 X 19 modified SS 3-blade prop (14 X 21 effective) :StingRay Hydrofoil :35 mph WOT @ 4800 RPM :32 mph cruise @ 4400 RPM : :Premium unleaded fuel (92 octane) :4 adults & 1 dog, ski equipment, coolers, etc- :6-7 gph WOT :5 gph cruise : : : :"Matt Lang" wrote in message . com... : Guys, : : I am thinking about getting a harbercraft jetboat ... these things are : made from aluminum and have the 175 HP Mercury sportjet.. : : So far so good ... Now what raises the fuel warning flag are the : terms: : : - jet : - 2 stroke : - carburator (two of them ;) : : The boat will burn about 5 gallons per hour at 30 mph... now I was : wondering how this compares to a similar sized fiberglass hboat with : 115-150 HP 4 Stroke outboard.. : : What is the fuel you burn at cruise speed and WOT, whats your boat : size/weight and what motor are you running .. : : I am interested in how the relatively light alu jetboat compares to a : more conventional boat with 4 stroke motor.. : : Any info is appreciated :) : : : Matt : : |
What is your fuel consumption?
5 MPG at WOT ! Wow, there are some RV owners that would like to do that well at any speed... This is an educated guess- could be inaccurate, but after several outings and refilling at the same gas station to a full tank after every outing, it seems to be about right. I'm using the Hour meter on my electronic compass, since the engine doesn't have one. The stated GPH rating for this boat/engine/outdrive/prop combo is a little over 7 GPH at WOT, mine may be better because I dont reach the 5100 RPM max engine speed due to my over-pitched prop. Also, the StingRay hydrofoil supposedly improves fuel economy 10% to 50%. We skied/tubed for about 2.5 hours Sunday, and puttered around for about 2 more, on a calm lake, and burned less than 14 gallons. 3 adults and 1 dog plus equipment. I'm not complaining at all...:) |
What is your fuel consumption?
I am using a standard (aluminum?) 14x17 prop, which seems to match the
boat well because my WOT is about 5200 rpm, but than again I don't know much about props. I do have a Sting Ray hydrofoil but I prefer not to use it unless I am going to be carrying a large load...it surely helps me get up on plane faster, but it also reduces my top end by a few mph as well as making the steering feel "tight" and not as responsive as without it. One thing that is different on my boat than many of the newer boats, is that the bow is closed so I can't put passengers up there, which probably does not affect the top speed, but sure does impact the ability to plane quickly when the boat has more than a few adults in it. Stanley Barthfarkle wrote: : What prop are you using? Do you have a Sting Ray Hydrofoil? If not, get :one. Boat planes better, and it allows use of a higher pitched prop (14 X 21 :SS cupped in my case). Less cavitation, and no "rooster tail"- energy that :would have been wasted with a rooster tail is sent rearward, increasing :propulsion. : : :"Bob" wrote in message ... : Dang, how do you get so much speed out of your little Volvo engine? I : have a newly rebuilt AQ130C ( 4 cyl. 130 hp) and it only takes my boat : up to 31 mph at WOT, about 5000 rpm with two adults in it. My boat is : a 17' fiberglass v-hull and weighs about 2000 lbs I would guess, and : has a Volvo 270 outdrive on it. : : BTW, it consumes just 3-4 gph at cruise speed (4200 rpm, 27 mph). : : Bob : : Stanley Barthfarkle wrote: : :1985 Bayliner 1952 cuddy : :18.5' fiberglass 'modified V' hull : :19.5' Length over all : :2200 lbs dry weight : :1985 Volvo Penta AQ125B 4 cyl 105 hp 4 stroke : :1 barrel Solex carb 35 mm : :Volvo Penta 270 Stern drive : :14 X 19 modified SS 3-blade prop (14 X 21 effective) : :StingRay Hydrofoil : :35 mph WOT @ 4800 RPM : :32 mph cruise @ 4400 RPM : : : :Premium unleaded fuel (92 octane) : :4 adults & 1 dog, ski equipment, coolers, etc- : :6-7 gph WOT : :5 gph cruise : : : : : : : :"Matt Lang" wrote in message : . com... : : Guys, : : : : I am thinking about getting a harbercraft jetboat ... these things are : : made from aluminum and have the 175 HP Mercury sportjet.. : : : : So far so good ... Now what raises the fuel warning flag are the : : terms: : : : : - jet : : - 2 stroke : : - carburator (two of them ;) : : : : The boat will burn about 5 gallons per hour at 30 mph... now I was : : wondering how this compares to a similar sized fiberglass hboat with : : 115-150 HP 4 Stroke outboard.. : : : : What is the fuel you burn at cruise speed and WOT, whats your boat : : size/weight and what motor are you running .. : : : : I am interested in how the relatively light alu jetboat compares to a : : more conventional boat with 4 stroke motor.. : : : : Any info is appreciated :) : : : : : : Matt : : : : : : : : |
What is your fuel consumption?
Bob, what model is your outdrive? Do you know the gear ratio? Seems to me
that you should be able to swing a more aggressively pitched prop (more top-end speed) with that engine, but it would help to know your outdrive specs. "Bob" wrote in message ... I am using a standard (aluminum?) 14x17 prop, which seems to match the boat well because my WOT is about 5200 rpm, but than again I don't know much about props. I do have a Sting Ray hydrofoil but I prefer not to use it unless I am going to be carrying a large load...it surely helps me get up on plane faster, but it also reduces my top end by a few mph as well as making the steering feel "tight" and not as responsive as without it. One thing that is different on my boat than many of the newer boats, is that the bow is closed so I can't put passengers up there, which probably does not affect the top speed, but sure does impact the ability to plane quickly when the boat has more than a few adults in it. Stanley Barthfarkle wrote: : What prop are you using? Do you have a Sting Ray Hydrofoil? If not, get :one. Boat planes better, and it allows use of a higher pitched prop (14 X 21 :SS cupped in my case). Less cavitation, and no "rooster tail"- energy that :would have been wasted with a rooster tail is sent rearward, increasing :propulsion. : : :"Bob" wrote in message ... : Dang, how do you get so much speed out of your little Volvo engine? I : have a newly rebuilt AQ130C ( 4 cyl. 130 hp) and it only takes my boat : up to 31 mph at WOT, about 5000 rpm with two adults in it. My boat is : a 17' fiberglass v-hull and weighs about 2000 lbs I would guess, and : has a Volvo 270 outdrive on it. : : BTW, it consumes just 3-4 gph at cruise speed (4200 rpm, 27 mph). : : Bob : : Stanley Barthfarkle wrote: : :1985 Bayliner 1952 cuddy : :18.5' fiberglass 'modified V' hull : :19.5' Length over all : :2200 lbs dry weight : :1985 Volvo Penta AQ125B 4 cyl 105 hp 4 stroke : :1 barrel Solex carb 35 mm : :Volvo Penta 270 Stern drive : :14 X 19 modified SS 3-blade prop (14 X 21 effective) : :StingRay Hydrofoil : :35 mph WOT @ 4800 RPM : :32 mph cruise @ 4400 RPM : : : :Premium unleaded fuel (92 octane) : :4 adults & 1 dog, ski equipment, coolers, etc- : :6-7 gph WOT : :5 gph cruise : : : : : : : :"Matt Lang" wrote in message : . com... : : Guys, : : : : I am thinking about getting a harbercraft jetboat ... these things are : : made from aluminum and have the 175 HP Mercury sportjet.. : : : : So far so good ... Now what raises the fuel warning flag are the : : terms: : : : : - jet : : - 2 stroke : : - carburator (two of them ;) : : : : The boat will burn about 5 gallons per hour at 30 mph... now I was : : wondering how this compares to a similar sized fiberglass hboat with : : 115-150 HP 4 Stroke outboard.. : : : : What is the fuel you burn at cruise speed and WOT, whats your boat : : size/weight and what motor are you running .. : : : : I am interested in how the relatively light alu jetboat compares to a : : more conventional boat with 4 stroke motor.. : : : : Any info is appreciated :) : : : : : : Matt : : : : : : : : |
What is your fuel consumption?
It's a model 270D...2.15:1 gear ratio. When the boat was brand new
(1972) and using the same pitch prop, the top-end was always 31-32 mph, so I feel good that I can get there with a rebuilt engine. Will a higher pitched prop, say a 14x19, drop the WOT rpms? If so, how does that equate to a higher WOT speed? Seems like it would do the opposite, but like I say I don't know much about props. Stanley Barthfarkle wrote: :Bob, what model is your outdrive? Do you know the gear ratio? Seems to me :that you should be able to swing a more aggressively pitched prop (more :top-end speed) with that engine, but it would help to know your outdrive :specs. : : :"Bob" wrote in message ... : I am using a standard (aluminum?) 14x17 prop, which seems to match the : boat well because my WOT is about 5200 rpm, but than again I don't know : much about props. I do have a Sting Ray hydrofoil but I prefer not to : use it unless I am going to be carrying a large load...it surely helps : me get up on plane faster, but it also reduces my top end by a few mph : as well as making the steering feel "tight" and not as responsive as : without it. One thing that is different on my boat than many of the : newer boats, is that the bow is closed so I can't put passengers up : there, which probably does not affect the top speed, but sure does : impact the ability to plane quickly when the boat has more than a few : adults in it. : : : Stanley Barthfarkle wrote: : : What prop are you using? Do you have a Sting Ray Hydrofoil? If not, get : :one. Boat planes better, and it allows use of a higher pitched prop (14 X :21 : :SS cupped in my case). Less cavitation, and no "rooster tail"- energy :that : :would have been wasted with a rooster tail is sent rearward, increasing : :propulsion. : : : : : :"Bob" wrote in message : ... : : Dang, how do you get so much speed out of your little Volvo engine? I : : have a newly rebuilt AQ130C ( 4 cyl. 130 hp) and it only takes my boat : : up to 31 mph at WOT, about 5000 rpm with two adults in it. My boat is : : a 17' fiberglass v-hull and weighs about 2000 lbs I would guess, and : : has a Volvo 270 outdrive on it. : : : : BTW, it consumes just 3-4 gph at cruise speed (4200 rpm, 27 mph). : : : : Bob : : : : Stanley Barthfarkle wrote: : : :1985 Bayliner 1952 cuddy : : :18.5' fiberglass 'modified V' hull : : :19.5' Length over all : : :2200 lbs dry weight : : :1985 Volvo Penta AQ125B 4 cyl 105 hp 4 stroke : : :1 barrel Solex carb 35 mm : : :Volvo Penta 270 Stern drive : : :14 X 19 modified SS 3-blade prop (14 X 21 effective) : : :StingRay Hydrofoil : : :35 mph WOT @ 4800 RPM : : :32 mph cruise @ 4400 RPM : : : : : :Premium unleaded fuel (92 octane) : : :4 adults & 1 dog, ski equipment, coolers, etc- : : :6-7 gph WOT : : :5 gph cruise : : : : : : : : : : : :"Matt Lang" wrote in message : : . com... : : : Guys, : : : : : : I am thinking about getting a harbercraft jetboat ... these things :are : : : made from aluminum and have the 175 HP Mercury sportjet.. : : : : : : So far so good ... Now what raises the fuel warning flag are the : : : terms: : : : : : : - jet : : : - 2 stroke : : : - carburator (two of them ;) : : : : : : The boat will burn about 5 gallons per hour at 30 mph... now I was : : : wondering how this compares to a similar sized fiberglass hboat with : : : 115-150 HP 4 Stroke outboard.. : : : : : : What is the fuel you burn at cruise speed and WOT, whats your boat : : : size/weight and what motor are you running .. : : : : : : I am interested in how the relatively light alu jetboat compares to :a : : : more conventional boat with 4 stroke motor.. : : : : : : Any info is appreciated :) : : : : : : : : : Matt : : : : : : : : : : : : : : : : : : |
What is your fuel consumption?
Stanley Barthfarkle wrote:
5 MPG at WOT ! Wow, there are some RV owners that would like to do that well at any speed... This is an educated guess- could be inaccurate, but after several outings and refilling at the same gas station to a full tank after every outing, it seems to be about right. I'm using the Hour meter on my electronic compass, since the engine doesn't have one. The stated GPH rating for this boat/engine/outdrive/prop combo is a little over 7 GPH at WOT, mine may be better because I dont reach the 5100 RPM max engine speed due to my over-pitched prop. Also, the StingRay hydrofoil supposedly improves fuel economy 10% to 50%. We skied/tubed for about 2.5 hours Sunday, and puttered around for about 2 more, on a calm lake, and burned less than 14 gallons. 3 adults and 1 dog plus equipment. I'm not complaining at all...:) There is one Volvo AQ131A-powered Glastron on our lake that is really good on gas too (and quiet!). I just didn't realize they were THAT good! Rob |
What is your fuel consumption?
Your theoretical top speed with your current configuration is 32.5 mph at
5100 rpm. Your theoretical top speed with a 14 x 19 prop is 34.1 mph at 4800 rpm. Your theoretical top speed with a 14 x 21 prop is 35.8 mph at 4550 rpm. Prop info: (note- 15% is the average amount of prop "slip") http://powerboat.about.com/cs/propel...llingfacts.htm http://www.a1discountprop.com/propinfo.htm http://www.rbbi.com/folders/prop/propcalc.htm http://www.csgnetwork.com/marinepropcalc.html http://www.go-fast.com/Prop_Slip_Calculator.htm http://www.fishweb.com/recreation/bo...ps/props1.html "Bob" wrote in message ... It's a model 270D...2.15:1 gear ratio. When the boat was brand new (1972) and using the same pitch prop, the top-end was always 31-32 mph, so I feel good that I can get there with a rebuilt engine. Will a higher pitched prop, say a 14x19, drop the WOT rpms? If so, how does that equate to a higher WOT speed? Seems like it would do the opposite, but like I say I don't know much about props. Stanley Barthfarkle wrote: :Bob, what model is your outdrive? Do you know the gear ratio? Seems to me :that you should be able to swing a more aggressively pitched prop (more :top-end speed) with that engine, but it would help to know your outdrive :specs. : : :"Bob" wrote in message ... : I am using a standard (aluminum?) 14x17 prop, which seems to match the : boat well because my WOT is about 5200 rpm, but than again I don't know : much about props. I do have a Sting Ray hydrofoil but I prefer not to : use it unless I am going to be carrying a large load...it surely helps : me get up on plane faster, but it also reduces my top end by a few mph : as well as making the steering feel "tight" and not as responsive as : without it. One thing that is different on my boat than many of the : newer boats, is that the bow is closed so I can't put passengers up : there, which probably does not affect the top speed, but sure does : impact the ability to plane quickly when the boat has more than a few : adults in it. : : : Stanley Barthfarkle wrote: : : What prop are you using? Do you have a Sting Ray Hydrofoil? If not, get : :one. Boat planes better, and it allows use of a higher pitched prop (14 X :21 : :SS cupped in my case). Less cavitation, and no "rooster tail"- energy :that : :would have been wasted with a rooster tail is sent rearward, increasing : :propulsion. : : : : : :"Bob" wrote in message : ... : : Dang, how do you get so much speed out of your little Volvo engine? I : : have a newly rebuilt AQ130C ( 4 cyl. 130 hp) and it only takes my boat : : up to 31 mph at WOT, about 5000 rpm with two adults in it. My boat is : : a 17' fiberglass v-hull and weighs about 2000 lbs I would guess, and : : has a Volvo 270 outdrive on it. : : : : BTW, it consumes just 3-4 gph at cruise speed (4200 rpm, 27 mph). : : : : Bob : : : : Stanley Barthfarkle wrote: : : :1985 Bayliner 1952 cuddy : : :18.5' fiberglass 'modified V' hull : : :19.5' Length over all : : :2200 lbs dry weight : : :1985 Volvo Penta AQ125B 4 cyl 105 hp 4 stroke : : :1 barrel Solex carb 35 mm : : :Volvo Penta 270 Stern drive : : :14 X 19 modified SS 3-blade prop (14 X 21 effective) : : :StingRay Hydrofoil : : :35 mph WOT @ 4800 RPM : : :32 mph cruise @ 4400 RPM : : : : : :Premium unleaded fuel (92 octane) : : :4 adults & 1 dog, ski equipment, coolers, etc- : : :6-7 gph WOT : : :5 gph cruise : : : : : : : : : : : :"Matt Lang" wrote in message : : . com... : : : Guys, : : : : : : I am thinking about getting a harbercraft jetboat ... these things :are : : : made from aluminum and have the 175 HP Mercury sportjet.. : : : : : : So far so good ... Now what raises the fuel warning flag are the : : : terms: : : : : : : - jet : : : - 2 stroke : : : - carburator (two of them ;) : : : : : : The boat will burn about 5 gallons per hour at 30 mph... now I was : : : wondering how this compares to a similar sized fiberglass hboat with : : : 115-150 HP 4 Stroke outboard.. : : : : : : What is the fuel you burn at cruise speed and WOT, whats your boat : : : size/weight and what motor are you running .. : : : : : : I am interested in how the relatively light alu jetboat compares to :a : : : more conventional boat with 4 stroke motor.. : : : : : : Any info is appreciated :) : : : : : : : : : Matt : : : : : : : : : : : : : : : : : : |
What is your fuel consumption?
Great info, Stanley...thanks. I had *absolutely* no clue that I could potentially increase the speed by using a higher pitch prop. My impression was always that your prop should allow your engine to get to it's max rpm in order to get max speed (which mine does)...guess I was wrong. But still, I'm not sure I want to spend ~$200 for a new prop to gain a few mph. Stanley Barthfarkle wrote: :Your theoretical top speed with your current configuration is 32.5 mph at :5100 rpm. :Your theoretical top speed with a 14 x 19 prop is 34.1 mph at 4800 rpm. :Your theoretical top speed with a 14 x 21 prop is 35.8 mph at 4550 rpm. : :Prop info: (note- 15% is the average amount of prop "slip") :http://powerboat.about.com/cs/propel...llingfacts.htm :http://www.a1discountprop.com/propinfo.htm :http://www.rbbi.com/folders/prop/propcalc.htm :http://www.csgnetwork.com/marinepropcalc.html :http://www.go-fast.com/Prop_Slip_Calculator.htm :http://www.fishweb.com/recreation/bo...ps/props1.html : : : :"Bob" wrote in message ... : It's a model 270D...2.15:1 gear ratio. When the boat was brand new : (1972) and using the same pitch prop, the top-end was always 31-32 mph, : so I feel good that I can get there with a rebuilt engine. Will a : higher pitched prop, say a 14x19, drop the WOT rpms? If so, how does : that equate to a higher WOT speed? Seems like it would do the opposite, : but like I say I don't know much about props. : : : Stanley Barthfarkle wrote: : :Bob, what model is your outdrive? Do you know the gear ratio? Seems to me : :that you should be able to swing a more aggressively pitched prop (more : :top-end speed) with that engine, but it would help to know your outdrive : :specs. : : : : : :"Bob" wrote in message : ... : : I am using a standard (aluminum?) 14x17 prop, which seems to match the : : boat well because my WOT is about 5200 rpm, but than again I don't know : : much about props. I do have a Sting Ray hydrofoil but I prefer not to : : use it unless I am going to be carrying a large load...it surely helps : : me get up on plane faster, but it also reduces my top end by a few mph : : as well as making the steering feel "tight" and not as responsive as : : without it. One thing that is different on my boat than many of the : : newer boats, is that the bow is closed so I can't put passengers up : : there, which probably does not affect the top speed, but sure does : : impact the ability to plane quickly when the boat has more than a few : : adults in it. : : : : : : Stanley Barthfarkle wrote: : : : What prop are you using? Do you have a Sting Ray Hydrofoil? If not, :get : : :one. Boat planes better, and it allows use of a higher pitched prop :(14 X : :21 : : :SS cupped in my case). Less cavitation, and no "rooster tail"- energy : :that : : :would have been wasted with a rooster tail is sent rearward, :increasing : : :propulsion. : : : : : : : : :"Bob" wrote in message : : ... : : : Dang, how do you get so much speed out of your little Volvo engine? :I : : : have a newly rebuilt AQ130C ( 4 cyl. 130 hp) and it only takes my :boat : : : up to 31 mph at WOT, about 5000 rpm with two adults in it. My boat :is : : : a 17' fiberglass v-hull and weighs about 2000 lbs I would guess, and : : : has a Volvo 270 outdrive on it. : : : : : : BTW, it consumes just 3-4 gph at cruise speed (4200 rpm, 27 mph). : : : : : : Bob : : : : : : Stanley Barthfarkle wrote: : : : :1985 Bayliner 1952 cuddy : : : :18.5' fiberglass 'modified V' hull : : : :19.5' Length over all : : : :2200 lbs dry weight : : : :1985 Volvo Penta AQ125B 4 cyl 105 hp 4 stroke : : : :1 barrel Solex carb 35 mm : : : :Volvo Penta 270 Stern drive : : : :14 X 19 modified SS 3-blade prop (14 X 21 effective) : : : :StingRay Hydrofoil : : : :35 mph WOT @ 4800 RPM : : : :32 mph cruise @ 4400 RPM : : : : : : : :Premium unleaded fuel (92 octane) : : : :4 adults & 1 dog, ski equipment, coolers, etc- : : : :6-7 gph WOT : : : :5 gph cruise : : : : : : : : : : : : : : : :"Matt Lang" wrote in message : : : . com... : : : : Guys, : : : : : : : : I am thinking about getting a harbercraft jetboat ... these :things : :are : : : : made from aluminum and have the 175 HP Mercury sportjet.. : : : : : : : : So far so good ... Now what raises the fuel warning flag are the : : : : terms: : : : : : : : : - jet : : : : - 2 stroke : : : : - carburator (two of them ;) : : : : : : : : The boat will burn about 5 gallons per hour at 30 mph... now I :was : : : : wondering how this compares to a similar sized fiberglass hboat :with : : : : 115-150 HP 4 Stroke outboard.. : : : : : : : : What is the fuel you burn at cruise speed and WOT, whats your :boat : : : : size/weight and what motor are you running .. : : : : : : : : I am interested in how the relatively light alu jetboat compares :to : :a : : : : more conventional boat with 4 stroke motor.. : : : : : : : : Any info is appreciated :) : : : : : : : : : : : : Matt : : : : : : : : : : : : : : : : : : : : : : : : : : : : : : : : |
What is your fuel consumption?
I'm sitting here looking at this info in amazement... I have dual 283
engines on the ChrisCraft which I haven't even had running to get any idea of what RPM's should be on it... Wondering what difference there could be with props and such... Will get the ratio, gearbox info when I get back to the shop tonight... Perhaps someone could help me figure it out. http://www.wildhorse-webdesign.com/boat "Bob" wrote in message ... Great info, Stanley...thanks. I had *absolutely* no clue that I could potentially increase the speed by using a higher pitch prop. My impression was always that your prop should allow your engine to get to it's max rpm in order to get max speed (which mine does)...guess I was wrong. But still, I'm not sure I want to spend ~$200 for a new prop to gain a few mph. Stanley Barthfarkle wrote: :Your theoretical top speed with your current configuration is 32.5 mph at :5100 rpm. :Your theoretical top speed with a 14 x 19 prop is 34.1 mph at 4800 rpm. :Your theoretical top speed with a 14 x 21 prop is 35.8 mph at 4550 rpm. : :Prop info: (note- 15% is the average amount of prop "slip") :http://powerboat.about.com/cs/propel...llingfacts.htm :http://www.a1discountprop.com/propinfo.htm :http://www.rbbi.com/folders/prop/propcalc.htm :http://www.csgnetwork.com/marinepropcalc.html :http://www.go-fast.com/Prop_Slip_Calculator.htm :http://www.fishweb.com/recreation/bo...ps/props1.html : : : :"Bob" wrote in message ... : It's a model 270D...2.15:1 gear ratio. When the boat was brand new : (1972) and using the same pitch prop, the top-end was always 31-32 mph, : so I feel good that I can get there with a rebuilt engine. Will a : higher pitched prop, say a 14x19, drop the WOT rpms? If so, how does : that equate to a higher WOT speed? Seems like it would do the opposite, : but like I say I don't know much about props. : : : Stanley Barthfarkle wrote: : :Bob, what model is your outdrive? Do you know the gear ratio? Seems to me : :that you should be able to swing a more aggressively pitched prop (more : :top-end speed) with that engine, but it would help to know your outdrive : :specs. : : : : : :"Bob" wrote in message : ... : : I am using a standard (aluminum?) 14x17 prop, which seems to match the : : boat well because my WOT is about 5200 rpm, but than again I don't know : : much about props. I do have a Sting Ray hydrofoil but I prefer not to : : use it unless I am going to be carrying a large load...it surely helps : : me get up on plane faster, but it also reduces my top end by a few mph : : as well as making the steering feel "tight" and not as responsive as : : without it. One thing that is different on my boat than many of the : : newer boats, is that the bow is closed so I can't put passengers up : : there, which probably does not affect the top speed, but sure does : : impact the ability to plane quickly when the boat has more than a few : : adults in it. : : : : : : Stanley Barthfarkle wrote: : : : What prop are you using? Do you have a Sting Ray Hydrofoil? If not, :get : : :one. Boat planes better, and it allows use of a higher pitched prop :(14 X : :21 : : :SS cupped in my case). Less cavitation, and no "rooster tail"- energy : :that : : :would have been wasted with a rooster tail is sent rearward, :increasing : : :propulsion. : : : : : : : : :"Bob" wrote in message : : ... : : : Dang, how do you get so much speed out of your little Volvo engine? :I : : : have a newly rebuilt AQ130C ( 4 cyl. 130 hp) and it only takes my :boat : : : up to 31 mph at WOT, about 5000 rpm with two adults in it. My boat :is : : : a 17' fiberglass v-hull and weighs about 2000 lbs I would guess, and : : : has a Volvo 270 outdrive on it. : : : : : : BTW, it consumes just 3-4 gph at cruise speed (4200 rpm, 27 mph). : : : : : : Bob : : : : : : Stanley Barthfarkle wrote: : : : :1985 Bayliner 1952 cuddy : : : :18.5' fiberglass 'modified V' hull : : : :19.5' Length over all : : : :2200 lbs dry weight : : : :1985 Volvo Penta AQ125B 4 cyl 105 hp 4 stroke : : : :1 barrel Solex carb 35 mm : : : :Volvo Penta 270 Stern drive : : : :14 X 19 modified SS 3-blade prop (14 X 21 effective) : : : :StingRay Hydrofoil : : : :35 mph WOT @ 4800 RPM : : : :32 mph cruise @ 4400 RPM : : : : : : : :Premium unleaded fuel (92 octane) : : : :4 adults & 1 dog, ski equipment, coolers, etc- : : : :6-7 gph WOT : : : :5 gph cruise : : : : : : : : : : : : : : : :"Matt Lang" wrote in message : : : . com... : : : : Guys, : : : : : : : : I am thinking about getting a harbercraft jetboat ... these :things : :are : : : : made from aluminum and have the 175 HP Mercury sportjet.. : : : : : : : : So far so good ... Now what raises the fuel warning flag are the : : : : terms: : : : : : : : : - jet : : : : - 2 stroke : : : : - carburator (two of them ;) : : : : : : : : The boat will burn about 5 gallons per hour at 30 mph... now I :was : : : : wondering how this compares to a similar sized fiberglass hboat :with : : : : 115-150 HP 4 Stroke outboard.. : : : : : : : : What is the fuel you burn at cruise speed and WOT, whats your :boat : : : : size/weight and what motor are you running .. : : : : : : : : I am interested in how the relatively light alu jetboat compares :to : :a : : : : more conventional boat with 4 stroke motor.. : : : : : : : : Any info is appreciated :) : : : : : : : : : : : : Matt : : : : : : : : : : : : : : : : : : : : : : : : : : : : : : : : |
What is your fuel consumption?
Good God!
Does anyone actually pay you for your web design services? |
What is your fuel consumption?
Actually, yes.. The page you saw was just thrown up because some friends
wanted to see the boat when I first bought it... Haven't done much with it since throwing it up. Needless to say, my own site isn't what I worry about.... I spend too much time on everyone else's. "Joe" wrote in message ... Good God! Does anyone actually pay you for your web design services? |
What is your fuel consumption?
"Matt Lang" wrote in message
om... Guys, I am thinking about getting a harbercraft jetboat ... these things are made from aluminum and have the 175 HP Mercury sportjet.. So far so good ... Now what raises the fuel warning flag are the terms: - jet - 2 stroke - carburator (two of them ;) The boat will burn about 5 gallons per hour at 30 mph... now I was wondering how this compares to a similar sized fiberglass hboat with 115-150 HP 4 Stroke outboard.. What is the fuel you burn at cruise speed and WOT, whats your boat size/weight and what motor are you running .. I am interested in how the relatively light alu jetboat compares to a more conventional boat with 4 stroke motor.. Any info is appreciated :) Matt Matt: I'm fairly familiar with the Harborcraft hulls, the old Jetcraft hulls and the sportjet. First, as someone pointed out, Harbaorcraft bought out Jetcraft - and pretty much changed all the lines to the Harborcraft hulls, whether they be labeled Jetcraft or Harborcraft. The new Jetcrafts are really nothing like the old ones, and they are exactly like the Harborcrafts. Not to say Harborcraft/jetcraft aren't decent enough hulls - they are very fine hulls. But, they're not of the Grade A+++, bulletproof build quality of the old Jetcraft. And you're not paying that kind of money either, probably. Just mho, of course. AND, this isn't your question anyway! the Merc 175 carbeurated sportjet. I've spent a lot of time with my friend's and have gone on a very long trip with him as well as many short ones. Where are you getting the 5 GPH at 30 mph stat? Product literature (propaganda) or actual experience? Our experience, with a hull that's a bit lighter than any Harborcraft hull I've seen is more like 10 GPH at cruising speed which indeed is around 30mph (with over 40 at wot). About 3 miles per gallon, rule of thumb. Which, by the way, is excellent mileage for a 2 stroke jet. With a comparable large outboard jet on a boat of any size, one is lucky to get 2 - 2.5 miles per gallon at that speed/rpms, so we've always figured the sportjet is a good 30-50% better - and this is measured, not manufacturer's info. Your mileage estimation at 5 gph would be 6 mpg, which would be unbelievable for any jet boat with a large V6 two stroke - and about double what an inboard Chevy-based jet would get (which are generally considered to be quite a bit more fuel efficient than any two stroke jet) - which indicates to me how far fetched it is. My 90s era carbeurated Chevy 5.7 L inboard jet (on an old Jetcraft, by the way) burned 8-10 gph at cruising (around 30 mph) speed; anything under 10 gph was considered pretty good for that speed. By the way, the info my friend received in the sales brochure for his boat also said 5 mpg at that speed and it's just not proven to be true. That said, I really think the Merc sport jet line is a great option for a jet boat. In my opinion, the Merc. sport jet is BY FAR the most efficient 2 stroke carbeureated jet - far more efficient than a comparably powered outboard jet. I would assume the 200 hp Optimax is even more efficient. I like them a lot and wouldn't hesitate to recommend them. I definitely like them better than any outboard jet option because of the efficiency and a lot more than any chevy-based jet because they're so much lighter and take up less interior space. And don't get me wrong - there's absolutely nothing wrong with the Harborcraft. It's a fine fairly light weight and good value in a hull. In other words, even though I disagree with your mileage estimate, this sounds like a great, good valued rig to me, based on what I've seen of the hulls and what I know of the motors. Hope this helps. Cam |
What is your fuel consumption?
|
What is your fuel consumption?
On Tue, 18 May 2004 13:29:24 -0400, DSK wrote:
Dang, we measure fuel in gallons per hour (1.75 on our last trip). Of course, we burn diesel and only go about 8 knots. ========================== Doug, what kind of boat/engines? |
What is your fuel consumption?
My 15 hp Merc 2 stroke burns about 1 gph.
I have been tracking my fuel for about 200 hours. I am doing a tad over 1 GPH on a 20' pontoon with a 60 merc 4 stroke but I don't go fast very often. I cruise at around 3000rpm |
What is your fuel consumption?
"Calif Bill" wrote in message nk.net...
"DSK" wrote in message ... Calif Bill wrote: I run a Jetcraft 21' Bluewater and get about 1.75-2 mpg depending on throttle opening. Dang, we measure fuel in gallons per hour (1.75 on our last trip). Of course, we burn diesel and only go about 8 knots. Speed costs! Fair Skies Doug King Speed is addictive. Why I drove a Corvette when I raced sports cars. So you could be slow? There are, and were, many, many sports cars, in racing trim faster than a 'vette. |
What is your fuel consumption?
Wayne.B wrote:
Doug, what kind of boat/engines? 36' hard chine tugboat with a Ford Lehman 135SP. http://community.webshots.com/photo/...76569411zLxjAQ We have a four blade prop which I suspect has a bit too much pitch, clean & light the engine will not get up to rated RPMs. http://community.webshots.com/photo/...73346078zEdpFX 1600 rpm (which is a little below recommended cruise) gives us about 7.25 knots average and is relatively quiet & efficient. Other cruises we've been in more of a hurry and burned 2 ~ 2.2 gph. Fair Skies Doug King |
What is your fuel consumption?
"basskisser" wrote in message om... "Calif Bill" wrote in message nk.net... "DSK" wrote in message ... Calif Bill wrote: I run a Jetcraft 21' Bluewater and get about 1.75-2 mpg depending on throttle opening. Dang, we measure fuel in gallons per hour (1.75 on our last trip). Of course, we burn diesel and only go about 8 knots. Speed costs! Fair Skies Doug King Speed is addictive. Why I drove a Corvette when I raced sports cars. So you could be slow? There are, and were, many, many sports cars, in racing trim faster than a 'vette. 1966. But in racing trim those other cars / sports racers were much more costly. When the 911B came out, the cost jumped to $30k for a race ready car. This from the $7k range. I almost bought a Ferrari GTO. They were available after the Datona race for $5500. Did not buy it, as I figured I could not afford to replace a ZF trannie. Bad decision. Most collectable Ferrari. Highest price paid during the 90's boom was $16.5 million. Would have been are really fantastic ROI. |
What is your fuel consumption?
"Calif Bill" wrote in message ink.net...
"basskisser" wrote in message om... "Calif Bill" wrote in message nk.net... "DSK" wrote in message ... Calif Bill wrote: I run a Jetcraft 21' Bluewater and get about 1.75-2 mpg depending on throttle opening. Dang, we measure fuel in gallons per hour (1.75 on our last trip). Of course, we burn diesel and only go about 8 knots. Speed costs! Fair Skies Doug King Speed is addictive. Why I drove a Corvette when I raced sports cars. So you could be slow? There are, and were, many, many sports cars, in racing trim faster than a 'vette. 1966. But in racing trim those other cars / sports racers were much more costly. When the 911B came out, the cost jumped to $30k for a race ready car. This from the $7k range. I almost bought a Ferrari GTO. They were available after the Datona race for $5500. Did not buy it, as I figured I could not afford to replace a ZF trannie. Bad decision. Most collectable Ferrari. Highest price paid during the 90's boom was $16.5 million. Would have been are really fantastic ROI. As I said, there were many, many faster sports cars in 66 than a vette. You didn't even mention McLaren |
What is your fuel consumption?
"basskisser" wrote in message om... "Calif Bill" wrote in message ink.net... "basskisser" wrote in message om... "Calif Bill" wrote in message nk.net... "DSK" wrote in message ... Calif Bill wrote: I run a Jetcraft 21' Bluewater and get about 1.75-2 mpg depending on throttle opening. Dang, we measure fuel in gallons per hour (1.75 on our last trip). Of course, we burn diesel and only go about 8 knots. Speed costs! Fair Skies Doug King Speed is addictive. Why I drove a Corvette when I raced sports cars. So you could be slow? There are, and were, many, many sports cars, in racing trim faster than a 'vette. 1966. But in racing trim those other cars / sports racers were much more costly. When the 911B came out, the cost jumped to $30k for a race ready car. This from the $7k range. I almost bought a Ferrari GTO. They were available after the Datona race for $5500. Did not buy it, as I figured I could not afford to replace a ZF trannie. Bad decision. Most collectable Ferrari. Highest price paid during the 90's boom was $16.5 million. Would have been are really fantastic ROI. As I said, there were many, many faster sports cars in 66 than a vette. You didn't even mention McLaren Take a reading comprehension course. As I quote"But in racing trim those other cars / sports racers were much more costly. " A McLaren was a sports racer. A cobra was $8800 in full race trim from Shelby. A McLaren was probably in the $40k range. I was working full time and going to college 1/2 time. Could not afford a $40k car. $12-16k a year income was good for the times, but still did not qualify to run a custom racer. Then you had Holman -Moody showing up at Laguna Seca with the Ford J cars and 2 semitrucks. One as a hospitality lounge and the other with a full machine shop. Including turret lathe. Back door covered with different rate sway bars. Yeh, I could afford to own and run a McLaren or a GT-40. . . |
What is your fuel consumption?
"Wayne.B" wrote in message ... On 18 May 2004 08:22:34 -0700, (Matt Lang) wrote: I am thinking about getting a harbercraft jetboat ... these things are made from aluminum and have the 175 HP Mercury sportjet.. A good rule of thumb for estimating fuel burn is 1 gallon per hour for every 10 horsepower. Actual horsepower at cruising speed should be about 50 to 60% of maximum. Using those numbers you get a fuel consumption of 9 to 10 gph which sounds about right to me. Nasty. The 180 hp Cessna I fly burns 7.5 gallons per hour and cruises at 130 knots. -c |
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