Outboard upgrade
 

I have an 18 ft. Lund Fisherman with a Yamaha F115 motor. I'm
thinking of upgrading to the new Yamaha F150, the maximum rated hp for
my boat. My boat's top speed now is approximately 40 mph w/2 people
and gear. I mostly use the boat for fishing, but there's some
occasional waterskiing.

What kind of performance increase could I expect by adding 35 hp,
assuming comparable props?

Any ideas on the trade in value of the 2000 F115? I'm trying to
decide if there would be enough of an improvement to justify the cost.

Thanks.

Outboard upgrade
 

If no answer here, post on boats and motor board at www.walleyecentral.com
Lots of Lund guys on that board.
Bill

"nfisherman" wrote in message
m...
I have an 18 ft. Lund Fisherman with a Yamaha F115 motor. I'm
thinking of upgrading to the new Yamaha F150, the maximum rated hp for
my boat. My boat's top speed now is approximately 40 mph w/2 people
and gear. I mostly use the boat for fishing, but there's some
occasional waterskiing.

What kind of performance increase could I expect by adding 35 hp,
assuming comparable props?

Any ideas on the trade in value of the 2000 F115? I'm trying to
decide if there would be enough of an improvement to justify the cost.

Thanks.

Outboard upgrade
 

nffisherman,
I have to wonder how much faster do you want to go? 40 sounds pretty
healthy to me. If you were into racing I'd understand it or a professional
tournament fisherman perhaps. I agree there is something to bigger is
better, but at least for me there's financial limitations, sort of like
return on investments. If the goal is to pull skiers better, perhaps a prop
change would help at a loss to higher top speed. Please don't take this as a
criticism, if you have the need for speed and 40 doesn't get it, by all
means go for it. Happy boating!
Paul

"nfisherman" wrote in message
m...
I have an 18 ft. Lund Fisherman with a Yamaha F115 motor. I'm
thinking of upgrading to the new Yamaha F150, the maximum rated hp for
my boat. My boat's top speed now is approximately 40 mph w/2 people
and gear. I mostly use the boat for fishing, but there's some
occasional waterskiing.

What kind of performance increase could I expect by adding 35 hp,
assuming comparable props?

Any ideas on the trade in value of the 2000 F115? I'm trying to
decide if there would be enough of an improvement to justify the cost.

Thanks.

Outboard upgrade
 

"Paul Schilter" paulschilter@comcast,dot,net wrote in message
...
nffisherman,
I have to wonder how much faster do you want to go? 40 sounds
pretty
healthy to me. If you were into racing I'd understand it or a
professional
tournament fisherman perhaps. I agree there is something to bigger is
better, but at least for me there's financial limitations, sort of
like
return on investments. If the goal is to pull skiers better, perhaps a
prop
change would help at a loss to higher top speed. Please don't take
this as a
criticism, if you have the need for speed and 40 doesn't get it, by
all
means go for it. Happy boating!
Paul

"nfisherman" wrote in message
m...
I have an 18 ft. Lund Fisherman with a Yamaha F115 motor. I'm
thinking of upgrading to the new Yamaha F150, the maximum rated hp
for
my boat. My boat's top speed now is approximately 40 mph w/2 people
and gear. I mostly use the boat for fishing, but there's some
occasional waterskiing.

What kind of performance increase could I expect by adding 35 hp,
assuming comparable props?

Any ideas on the trade in value of the 2000 F115? I'm trying to
decide if there would be enough of an improvement to justify the
cost.

Thanks.

A generally accepted rule of thumb is that speed goes as the square root
of HP (or power/weight). So increasing HP by 150/115 will get you about
15% more speed or 6 mph. Or you could call up Lund in Minnesota and ask
them.

del cecchi

Outboard upgrade
 

On 21 Feb 2004 07:21:17 -0800, (nfisherman)
wrote:
I have an 18 ft. Lund Fisherman with a Yamaha F115 motor. I'm
thinking of upgrading to the new Yamaha F150, the maximum rated hp for
my boat. My boat's top speed now is approximately 40 mph w/2 people
and gear. I mostly use the boat for fishing, but there's some
occasional waterskiing.

What kind of performance increase could I expect by adding 35 hp,
assuming comparable props?

================================================== ==
Since speed varies approximately in proportion to the square root of
horsepower in a planing boat, I would estimate a new top speed of 45
to 46 mph. (Doubling the horsepower will increase speed by about 41
percent since the sqrt of 2 is 1.414).

Cruising speed at 75% of WOT will increase by 3 or 4 mph which is not
a big enough difference to be worthwhile in my opinion unless you have
a difficult time staying on plane when heavily loaded.

Outboard upgrade
 

Thanks for all of the comments. I emailed a local dealer yesterday to
confirm how much this upgrade would cost. It came to about $7,500.
That's over $1,000 per MPH increase. Of course with a boat,there's
always the gee whiz factor, but besides that there isn't much of a
reason to upgrade. I'll wait a few years until my baby boy grows up
enough to fish with me. I'll convince the wife that I need a new boat
to keep our son safe and then I'll trade the whole rig in for a new
Lund and a bigger motor.




(nfisherman) wrote in message om...
I have an 18 ft. Lund Fisherman with a Yamaha F115 motor. I'm
thinking of upgrading to the new Yamaha F150, the maximum rated hp for
my boat. My boat's top speed now is approximately 40 mph w/2 people
and gear. I mostly use the boat for fishing, but there's some
occasional waterskiing.

What kind of performance increase could I expect by adding 35 hp,
assuming comparable props?

Any ideas on the trade in value of the 2000 F115? I'm trying to
decide if there would be enough of an improvement to justify the cost.

Thanks.

Outboard upgrade
 

"nfisherman" wrote in message
m...

What kind of performance increase could I expect by adding 35 hp,
assuming comparable props?


First, I would expect that you would want a bigger/higher pitched prop on
the new motor. If you keep the prop the same size then you would probably
have the engine RPMs to high at top end.

If you are measuring performance on top speed alone you might be
disappointed. Where the extra HP will have the greatest impact is when you
are pulling a water skier or have the boat loaded down with extra people
and/or gear.

Rod