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Damned airboats
I was at the springs at the head of he Wacissa River this afternoon
cooling down on a hot Sept afternoon. From far away you could hear it coming upriver, another airboat. I hate the damn things. I dont hate em for going places, I hate the noise. So, is it the prop or engine that makes all the noise? Could you maybe make an effective prop that would be less noisy? |
Damned airboats
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Damned airboats
On Sep 7, 10:07 pm, hk wrote:
wrote: I was at the springs at the head of he Wacissa River this afternoon cooling down on a hot Sept afternoon. From far away you could hear it coming upriver, another airboat. I hate the damn things. I dont hate em for going places, I hate the noise. So, is it the prop or engine that makes all the noise? Could you maybe make an effective prop that would be less noisy? Get a noise ordinance passed and get it enforced. That's what we did where I lived in Florida. No airboats before or after certain hours of the day. We also made a stink about the damned things cruising over and cutting swaths through the wetlands. I think they like the noise. Same sort of guys as the ones who remove the mufflers on their motorcycles and put straight pipes on the little Japanese cars. Big noise, small dick. You may be right about them liking the noise. Maybe this is a techno- opportunity to find a way around the noise generation. A little searching shows that major noise is from the prop although many boats have unmuffled engines too. I wonder if putting a cowling around the prop would work, somebody must tried this. |
Damned airboats
On Sep 7, 10:12 pm, wrote:
On Sep 7, 10:07 pm, hk wrote: wrote: I was at the springs at the head of he Wacissa River this afternoon cooling down on a hot Sept afternoon. From far away you could hear it coming upriver, another airboat. I hate the damn things. I dont hate em for going places, I hate the noise. So, is it the prop or engine that makes all the noise? Could you maybe make an effective prop that would be less noisy? Get a noise ordinance passed and get it enforced. That's what we did where I lived in Florida. No airboats before or after certain hours of the day. We also made a stink about the damned things cruising over and cutting swaths through the wetlands. I think they like the noise. Same sort of guys as the ones who remove the mufflers on their motorcycles and put straight pipes on the little Japanese cars. Big noise, small dick. You may be right about them liking the noise. Maybe this is a techno- opportunity to find a way around the noise generation. A little searching shows that major noise is from the prop although many boats have unmuffled engines too. I wonder if putting a cowling around the prop would work, somebody must tried this. Found a DTIC report (that I do not want to pay for) saying that a cowling and redesigned multiblade prop will reduce prop noise. Another report from the nature Conservancy discusses noise and finds that muffling always helps some. They also say that noise is worst at high prop tip speeds so it is best to go with a multiblade prop. Worst noise whn one is attempting to get underway from land or sandbar or to get unstuck. So, is this an opportunity for someone to make composite airboat props with multiple blades to replace all the old ones with two blades? |
Damned airboats
On Sep 7, 10:41 pm, wrote:
On Sep 7, 10:12 pm, wrote: On Sep 7, 10:07 pm, hk wrote: wrote: I was at the springs at the head of he Wacissa River this afternoon cooling down on a hot Sept afternoon. From far away you could hear it coming upriver, another airboat. I hate the damn things. I dont hate em for going places, I hate the noise. So, is it the prop or engine that makes all the noise? Could you maybe make an effective prop that would be less noisy? Get a noise ordinance passed and get it enforced. That's what we did where I lived in Florida. No airboats before or after certain hours of the day. We also made a stink about the damned things cruising over and cutting swaths through the wetlands. I think they like the noise. Same sort of guys as the ones who remove the mufflers on their motorcycles and put straight pipes on the little Japanese cars. Big noise, small dick. You may be right about them liking the noise. Maybe this is a techno- opportunity to find a way around the noise generation. A little searching shows that major noise is from the prop although many boats have unmuffled engines too. I wonder if putting a cowling around the prop would work, somebody must tried this. Found a DTIC report (that I do not want to pay for) saying that a cowling and redesigned multiblade prop will reduce prop noise. Another report from the nature Conservancy discusses noise and finds that muffling always helps some. They also say that noise is worst at high prop tip speeds so it is best to go with a multiblade prop. Worst noise whn one is attempting to get underway from land or sandbar or to get unstuck. So, is this an opportunity for someone to make composite airboat props with multiple blades to replace all the old ones with two blades? I cannot jump on these airboat ppl too much for being ignorant rednecks, partly because I ma probably related to em and partly because airboats do have good uses. The Wacissa is a place for em as the water is often so shallow and covered with hydrilla. It would really make people like them if the noise could be significantly reduced. They seem to have enough power to be able to reduce noise somehow. Maybe radically re-think the whole concept. At very least put cowlings around the blades so the noise goes up or back rather than be emitted in all directions. |
Damned airboats
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Damned airboats
I rode in an air boat once, and I do mean once. and not long. I was
invited to go, and I was sitting tight in front of a 220 hp Lycoming . Even with ear plugs the noise was deafening. We went about 3 mi. up the Wabash river, and I tapped the "pilot" on the shoulder and said. "I'm getting off. he looked at me funny and kept saying A"WHAT?" WHAT?" I knew it was too loud. I was wearing a pretty good vest so I just bailed off! he circled around and shut the thing down, and I told him I'd float back. At that moment I didn't care. He took off and I could hear him all the way back down to the docks. A friend of mine came by in a ski boat and picked me up. Like I said, even with ear plugs, I had a head ache for a day and couldn't quit hearing that fan at night. I won't do it again. |
Damned airboats
On Sep 8, 10:37*am, wrote:
On Sep 7, 10:41 pm, wrote: On Sep 7, 10:12 pm, wrote: On Sep 7, 10:07 pm, hk wrote: wrote: I was at the springs at the head of he Wacissa River this afternoon cooling down on a hot Sept afternoon. *From far away you could hear it coming upriver, another airboat. *I hate the damn things. *I dont hate em for going places, I hate the noise. *So, is it the prop or engine that makes all the noise? *Could you maybe make an effective prop that would be less noisy? Get a noise ordinance passed and get it enforced. That's what we did where I lived in Florida. No airboats before or after certain hours of the day. We also made a stink about the damned things cruising over and cutting swaths through the wetlands. I think they like the noise. Same sort of guys as the ones who remove the mufflers on their motorcycles and put straight pipes on the little Japanese cars. Big noise, small dick. You may be right about them liking the noise. *Maybe this is a techno- opportunity to find a way around the noise generation. *A little searching shows that major noise is from the prop although many boats have unmuffled engines too. I wonder if putting a cowling around the prop would work, somebody must tried this. Found a DTIC report (that I do not want to pay for) saying that a cowling and redesigned multiblade prop will reduce prop noise. Another report from the nature Conservancy discusses noise and finds that muffling always helps some. *They also say that noise is worst at high prop tip speeds so it is best to go with a multiblade prop. Worst noise whn one is attempting to get underway from land or sandbar or to get unstuck. So, is this an opportunity for someone to make composite airboat props with multiple blades to replace all the old ones with two blades? I cannot jump on these airboat ppl too much for being ignorant rednecks, partly because I ma probably related to em and partly because airboats do have good uses. *The Wacissa is a place for em as the water is often so shallow and covered with hydrilla. *It would really make people like them if the noise could be significantly reduced. *They seem to have enough power to be able to reduce noise somehow. *Maybe radically re-think the whole concept. *At very least put cowlings around the blades so the noise goes up or back rather than be emitted in all directions.- Hide quoted text - - Show quoted text - WTF? Can't they put a muffler system on them, or is it the blades that make the most noise? |
Damned airboats
On Sep 8, 11:23*am, wrote:
On Sep 8, 10:37*am, wrote: On Sep 7, 10:41 pm, wrote: On Sep 7, 10:12 pm, wrote: On Sep 7, 10:07 pm, hk wrote: wrote: I was at the springs at the head of he Wacissa River this afternoon cooling down on a hot Sept afternoon. *From far away you could hear it coming upriver, another airboat. *I hate the damn things. *I dont hate em for going places, I hate the noise. *So, is it the prop or engine that makes all the noise? *Could you maybe make an effective prop that would be less noisy? Get a noise ordinance passed and get it enforced. That's what we did where I lived in Florida. No airboats before or after certain hours of the day. We also made a stink about the damned things cruising over and cutting swaths through the wetlands. I think they like the noise. Same sort of guys as the ones who remove the mufflers on their motorcycles and put straight pipes on the little Japanese cars. Big noise, small dick. You may be right about them liking the noise. *Maybe this is a techno- opportunity to find a way around the noise generation. *A little searching shows that major noise is from the prop although many boats have unmuffled engines too. I wonder if putting a cowling around the prop would work, somebody must tried this. Found a DTIC report (that I do not want to pay for) saying that a cowling and redesigned multiblade prop will reduce prop noise. Another report from the nature Conservancy discusses noise and finds that muffling always helps some. *They also say that noise is worst at high prop tip speeds so it is best to go with a multiblade prop. Worst noise whn one is attempting to get underway from land or sandbar or to get unstuck. So, is this an opportunity for someone to make composite airboat props with multiple blades to replace all the old ones with two blades? I cannot jump on these airboat ppl too much for being ignorant rednecks, partly because I ma probably related to em and partly because airboats do have good uses. *The Wacissa is a place for em as the water is often so shallow and covered with hydrilla. *It would really make people like them if the noise could be significantly reduced. *They seem to have enough power to be able to reduce noise somehow. *Maybe radically re-think the whole concept. *At very least put cowlings around the blades so the noise goes up or back rather than be emitted in all directions.- Hide quoted text - - Show quoted text - WTF? Can't they put a muffler system on them, or is it the blades that make the most noise?- Hide quoted text - - Show quoted text - Normal IC aircraft engines aren't muffled, and the back pressure has an affect on them if you try to. I took an airboat ride once. Stopped at a bar in South Florida that was right on the swamp. Several airboats at the docks. Never been on one, so I asked the barkeep who in there might give me a ride. Big old swampbilly says "buy me a beer, I'll take ya". Off we go! I've gone fast all of my life and he still managed to scare me some! When we turned around he just hammered that thing and hit a small hammock (little islands in the swamp) going like a bat out of hell! |
Damned airboats
On Mon, 8 Sep 2008 08:31:27 -0700 (PDT), wrote:
Normal IC aircraft engines aren't muffled, and the back pressure has an affect on them if you try to. Most, maybe all, of the planes I have experience with have had mufflers. Includes radial engines from the thirties, and the usual Piper, Beech, and Cessna planes in use from the forties on. Still loud, every one of them. Casady |
Damned airboats
On Sep 8, 1:33*pm, (Richard Casady) wrote:
On Mon, 8 Sep 2008 08:31:27 -0700 (PDT), wrote: Normal IC aircraft engines aren't muffled, and the back pressure has an affect on them if you try to. Most, maybe all, of the planes I have experience with have had mufflers. Includes radial engines from the thirties, and the usual Piper, Beech, and Cessna planes in use from the forties on. Still loud, every one of them. Casady From what loogie suggests, the engines may not run if muffled too much. Is there ways to do it? Could these boats be made to be somewhat sane? I know that with our bikes there are trick pipes that are very loud, but several private tracks we frequent won't allow them. Guys have to change pipes and rejet to ride there, but it can be done... I don't think there is a lot of reason for a pleasure boat to be so loud, although I do not have problems with loud vehicles in sanctioned races, with proper permits and such... |
Damned airboats
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Damned airboats
On Sep 8, 2:14*pm, (Richard Casady) wrote:
On Mon, 8 Sep 2008 10:53:44 -0700 (PDT), wrote: On Sep 8, 1:33*pm, (Richard Casady) wrote: On Mon, 8 Sep 2008 08:31:27 -0700 (PDT), wrote: Normal IC aircraft engines aren't muffled, and the back pressure has an affect on them if you try to. Most, maybe all, of the planes I have experience with have had mufflers. Includes radial engines from the thirties, and the usual Piper, Beech, and Cessna planes in use from the forties on. Still loud, every one of them. Casady From what loogie suggests, the engines may not run if muffled too much. Is there ways to do it? Could these boats be made to be somewhat sane? I know that with our bikes there are trick pipes that are very loud, but several private tracks we frequent won't allow them. Guys have to change pipes and rejet to ride there, but it can be done... I don't think there is a lot of reason for a pleasure boat to be so loud, although I do not have problems with loud vehicles in sanctioned races, with proper permits and such... They require mufflers on sprint cars at many tracks. Casady- Hide quoted text - - Show quoted text - Same with MX racing with N.E.M.A.. they have a sound check before races but the levels are high. It is some of the private tracks where they are more strict. Like I said, the NEMA races are sanctioned and within the zoning and other guidelines as agreed with the local communities.. But they do have limits.. My question is, is it possible for these airboats to run at all within tolerable noise levels, or do the engines just make that impossible? If so, maybe they need to find an alternative power source, or a more suited tool.. Just because something works, doesn't mean it's the best tool for the job. Who hasn't used a screwdriver as a prybar;) |
Damned airboats
On Sep 8, 1:33*pm, (Richard Casady) wrote:
On Mon, 8 Sep 2008 08:31:27 -0700 (PDT), wrote: Normal IC aircraft engines aren't muffled, and the back pressure has an affect on them if you try to. Most, maybe all, of the planes I have experience with have had mufflers. Includes radial engines from the thirties, and the usual Piper, Beech, and Cessna planes in use from the forties on. Still loud, every one of them. Casady Expansion chambers. They aren't really mufflers, but are designed to make some backpressure in normally aspirated engines. My uncle was an aviation machinist. Been around small IC engined aircraft a lot! |
Damned airboats
On Sep 8, 2:29*pm, wrote:
On Sep 8, 1:33*pm, (Richard Casady) wrote: On Mon, 8 Sep 2008 08:31:27 -0700 (PDT), wrote: Normal IC aircraft engines aren't muffled, and the back pressure has an affect on them if you try to. Most, maybe all, of the planes I have experience with have had mufflers. Includes radial engines from the thirties, and the usual Piper, Beech, and Cessna planes in use from the forties on. Still loud, every one of them. Casady Expansion chambers. They aren't really mufflers, but are designed to make some backpressure in normally aspirated engines. My uncle was an aviation machinist. Been around small IC engined aircraft a lot! AHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHH!!!!!!!!!!!!!! !!!!!!!!!!!!!!!!!!!!!! COULD THEY MAKE THEM QUIETER IF THEY WANTED TO????????? Please answer me..... I gotta' know... sniff ;) |
Damned airboats
On Sep 8, 2:35*pm, wrote:
On Sep 8, 2:29*pm, wrote: On Sep 8, 1:33*pm, (Richard Casady) wrote: On Mon, 8 Sep 2008 08:31:27 -0700 (PDT), wrote: Normal IC aircraft engines aren't muffled, and the back pressure has an affect on them if you try to. Most, maybe all, of the planes I have experience with have had mufflers. Includes radial engines from the thirties, and the usual Piper, Beech, and Cessna planes in use from the forties on. Still loud, every one of them. Casady Expansion chambers. They aren't really mufflers, but are designed to make some backpressure in normally aspirated engines. My uncle was an aviation machinist. Been around small IC engined aircraft a lot! AHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHH!!!!!!!!!!!!!! !!!!!!!!!!!!!!!!!!!!!! COULD THEY MAKE THEM QUIETER IF THEY WANTED TO????????? Please answer me..... * I gotta' know... sniff * ;)- Hide quoted text - - Show quoted text - There is not really any reason they could not have mufflers on the engine. It would probably take a few mph off the top end. But much of the noise is from the prop. Many simply bolt the prop to the engine output so there is not a lot you can do with prop redesign. More blades may allow you to run a smaller diameter but probably not a lot smaller. So the prop tip speeds are still going to be pretty high. |
Damned airboats
On Sep 8, 2:35*pm, wrote:
On Sep 8, 2:29*pm, wrote: On Sep 8, 1:33*pm, (Richard Casady) wrote: On Mon, 8 Sep 2008 08:31:27 -0700 (PDT), wrote: Normal IC aircraft engines aren't muffled, and the back pressure has an affect on them if you try to. Most, maybe all, of the planes I have experience with have had mufflers. Includes radial engines from the thirties, and the usual Piper, Beech, and Cessna planes in use from the forties on. Still loud, every one of them. Casady Expansion chambers. They aren't really mufflers, but are designed to make some backpressure in normally aspirated engines. My uncle was an aviation machinist. Been around small IC engined aircraft a lot! AHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHH!!!!!!!!!!!!!! !!!!!!!!!!!!!!!!!!!!!! COULD THEY MAKE THEM QUIETER IF THEY WANTED TO????????? Please answer me..... * I gotta' know... sniff * ;)- Hide quoted text - - Show quoted text - I'm guessing they could at the risk of performance, especially the inlines. Radials may be harder because of the piping involved. W's not used much anymore, and X's, quite rare may be different! |
Damned airboats
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Damned airboats
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Damned airboats
On Sep 8, 3:33*pm, John H wrote:
On Mon, 8 Sep 2008 11:56:46 -0700 (PDT), wrote: On Sep 8, 2:35*pm, wrote: On Sep 8, 2:29*pm, wrote: On Sep 8, 1:33*pm, (Richard Casady) wrote: On Mon, 8 Sep 2008 08:31:27 -0700 (PDT), wrote: Normal IC aircraft engines aren't muffled, and the back pressure has an affect on them if you try to. Most, maybe all, of the planes I have experience with have had mufflers. Includes radial engines from the thirties, and the usual Piper, Beech, and Cessna planes in use from the forties on. Still loud, every one of them. Casady Expansion chambers. They aren't really mufflers, but are designed to make some backpressure in normally aspirated engines. My uncle was an aviation machinist. Been around small IC engined aircraft a lot! AHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHH!!!!!!!!!!!!!! !!!!!!!!!!!!!!!!!!!!!! COULD THEY MAKE THEM QUIETER IF THEY WANTED TO????????? Please answer me..... * I gotta' know... sniff * ;)- Hide quoted text - - Show quoted text - There is not really any reason they could not have mufflers on the engine. *It would probably take a few mph off the top end. *But much of the noise is from the prop. *Many simply bolt the prop to the engine output so there is not a lot you can do with prop redesign. More blades may allow you to run a smaller diameter but probably not a lot smaller. *So the prop tip speeds are still going to be pretty high. I just spoke with a young man in Orlando. He's at Don George Aircraft Engines & Parts Orlando, Florida 32805 * 407.422.0188 I remembered that the airboat I rode on had a Lycoming engine, which gave me a starting place. According to the guy I spoke with, the law in Florida requires mufflers on *all* airboat engines. The loudness comes from the propellor. Problem solved.- Hide quoted text - - Show quoted text - Sounds to me like there is not really a reasonable way to quiet the prop, without a complete retool.. Ok, as long as they are trying I guess most will have to live with it until noise limits are imposed and someone works out the technology to be efficient and affordable.. Might be, it can't be done, but not everyone can own a jet either;) |
Damned airboats
On Sep 8, 3:42*pm, wrote:
On Sep 8, 3:33*pm, John H wrote: On Mon, 8 Sep 2008 11:56:46 -0700 (PDT), wrote: On Sep 8, 2:35*pm, wrote: On Sep 8, 2:29*pm, wrote: On Sep 8, 1:33*pm, (Richard Casady) wrote: On Mon, 8 Sep 2008 08:31:27 -0700 (PDT), wrote: Normal IC aircraft engines aren't muffled, and the back pressure has an affect on them if you try to. Most, maybe all, of the planes I have experience with have had mufflers. Includes radial engines from the thirties, and the usual Piper, Beech, and Cessna planes in use from the forties on. Still loud, every one of them. Casady Expansion chambers. They aren't really mufflers, but are designed to make some backpressure in normally aspirated engines. My uncle was an aviation machinist. Been around small IC engined aircraft a lot! AHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHH!!!!!!!!!!!!!! !!!!!!!!!!!!!!!!!!!!!! COULD THEY MAKE THEM QUIETER IF THEY WANTED TO????????? Please answer me..... * I gotta' know... sniff * ;)- Hide quoted text - - Show quoted text - There is not really any reason they could not have mufflers on the engine. *It would probably take a few mph off the top end. *But much of the noise is from the prop. *Many simply bolt the prop to the engine output so there is not a lot you can do with prop redesign. More blades may allow you to run a smaller diameter but probably not a lot smaller. *So the prop tip speeds are still going to be pretty high. I just spoke with a young man in Orlando. He's at Don George Aircraft Engines & Parts Orlando, Florida 32805 * 407.422.0188 I remembered that the airboat I rode on had a Lycoming engine, which gave me a starting place. According to the guy I spoke with, the law in Florida requires mufflers on *all* airboat engines. The loudness comes from the propellor. Problem solved.- Hide quoted text - - Show quoted text - Sounds to me like there is not really a reasonable way to quiet the prop, without a complete retool.. Ok, as long as they are trying I guess most will have to live with it until noise limits are imposed and someone works out the technology to be efficient and affordable.. Might be, it can't be done, but not everyone can own a jet either;)- Hide quoted text - - Show quoted text - Yeah, I built a hovercraft once and the push engine was a twin cylinder two cycle rotax, The prop made more noise than the engine. |
Damned airboats
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Damned airboats
"Tim" wrote in message ... I rode in an air boat once, and I do mean once. and not long. I was invited to go, and I was sitting tight in front of a 220 hp Lycoming . Even with ear plugs the noise was deafening. We went about 3 mi. up the Wabash river, and I tapped the "pilot" on the shoulder and said. "I'm getting off. he looked at me funny and kept saying A"WHAT?" WHAT?" I knew it was too loud. I was wearing a pretty good vest so I just bailed off! he circled around and shut the thing down, and I told him I'd float back. At that moment I didn't care. He took off and I could hear him all the way back down to the docks. A friend of mine came by in a ski boat and picked me up. Like I said, even with ear plugs, I had a head ache for a day and couldn't quit hearing that fan at night. I won't do it again. Great story. I've never done it, but suspect my reaction would be about the same. Eisboch |
Damned airboats
wrote in message ... WTF? Can't they put a muffler system on them, or is it the blades that make the most noise? ---------------------------- Trust me. The engine is loud. The prop is much, much, louder. Eisboch |
Damned airboats
On Sep 8, 6:32*pm, "Eisboch" wrote:
wrote in message ... WTF? Can't they put a muffler system on them, or is it the blades that make the most noise? ---------------------------- Trust me. *The engine is loud. The prop is much, much, louder. Eisboch Kinda' thought so... So in that case, would it be unreasonalble for a particular jurisdiction to ban them? |
Damned airboats
On Sep 8, 5:32*pm, "Eisboch" wrote:
wrote in message ... WTF? Can't they put a muffler system on them, or is it the blades that make the most noise? ---------------------------- Trust me. *The engine is loud. The prop is much, much, louder. Eisboch Yes, go to an air show sometime and listen to a PiTT Special or a Citaborea make a low altitude fast fly-by. BWWWWWWAAAAAAAAAAAAAAAAHHHHHHHHHH! The noise you actually are hearing is the prop beating the air. then after they make the pass they get a lot quieter and you hear the engine rumble. What's cool is if somebody comes up with an old WW2 Corsair and makes a fly-by. Yes, you hear a tremendous noise coming fromt he prop then when they pass you hear that marvelous "gallop:" of the Pratt 'n Whitney radial! |
Damned airboats
On Sep 8, 7:12 pm, wrote:
On Mon, 8 Sep 2008 18:32:05 -0400, "Eisboch" wrote: wrote in message ... WTF? Can't they put a muffler system on them, or is it the blades that make the most noise? ---------------------------- Trust me. The engine is loud. The prop is much, much, louder. Eisboch Down at Wootens the make the passengers and the drivers wear ear protection. I don't know of anyone who doesn't. I do know a couple guys down in Everglades City who have airboats. So, why not put a shroud round the prop, it shoudl at least silence it some? |
Damned airboats
On Sep 8, 9:42*pm, wrote:
On Sep 8, 7:12 pm, wrote: On Mon, 8 Sep 2008 18:32:05 -0400, "Eisboch" wrote: wrote in message .... WTF? Can't they put a muffler system on them, or is it the blades that make the most noise? ---------------------------- Trust me. *The engine is loud. The prop is much, much, louder. Eisboch Down at Wootens the make the passengers and the drivers wear ear protection. I don't know of anyone who doesn't. I do know a couple guys down in Everglades City who have airboats. So, why not put a shroud round the prop, it shoudl at least silence it some? it would probably mess with the aerodynamic efficiency of the prop. I always wondered why you couldn't mount a big "squirrel cage" fan on a boat, those things put out a lot of air with less noise or at least I would think so |
Damned airboats
"Eisboch" wrote in message ... "Tim" wrote in message ... I rode in an air boat once, and I do mean once. and not long. I was invited to go, and I was sitting tight in front of a 220 hp Lycoming . Even with ear plugs the noise was deafening. We went about 3 mi. up the Wabash river, and I tapped the "pilot" on the shoulder and said. "I'm getting off. he looked at me funny and kept saying A"WHAT?" WHAT?" I knew it was too loud. I was wearing a pretty good vest so I just bailed off! he circled around and shut the thing down, and I told him I'd float back. At that moment I didn't care. He took off and I could hear him all the way back down to the docks. A friend of mine came by in a ski boat and picked me up. Like I said, even with ear plugs, I had a head ache for a day and couldn't quit hearing that fan at night. I won't do it again. Great story. I've never done it, but suspect my reaction would be about the same. Eisboch Took the airboat tour out of Doc Holiday's in the Everglades. 40 passenger twin engine V8 boats. Not that loud, and was an enjoyable tour. |
Damned airboats
On Sep 9, 12:29*am, wrote:
On Mon, 8 Sep 2008 20:02:27 -0700 (PDT), Tim wrote: I always wondered why you couldn't mount a big "squirrel cage" fan on a boat, those things put out a lot of air with less noise or at least I would think so Aircraft engineers looked at props for over 100 years and this is what they came up with. The guys who design wind turbine generators use the same type of prop. There must be something attractive about this design. Yes, it's actually the most p-practical way to move air. But it sure is noisy! |
Damned airboats
On Sep 8, 10:42*pm, wrote:
On Sep 8, 7:12 pm, wrote: On Mon, 8 Sep 2008 18:32:05 -0400, "Eisboch" wrote: wrote in message .... WTF? Can't they put a muffler system on them, or is it the blades that make the most noise? ---------------------------- Trust me. *The engine is loud. The prop is much, much, louder. Eisboch Down at Wootens the make the passengers and the drivers wear ear protection. I don't know of anyone who doesn't. I do know a couple guys down in Everglades City who have airboats. So, why not put a shroud round the prop, it shoudl at least silence it some?- Hide quoted text - - Show quoted text - The hovercraft I built had an optional build for a close fitting shroud that actually was supposed to boost thrust a little. I made it and installed it. As I recall it didn't help noise much if any at all. |
Damned airboats
On Sep 8, 6:58*pm, Tim wrote:
On Sep 8, 5:32*pm, "Eisboch" wrote: wrote in message ... WTF? Can't they put a muffler system on them, or is it the blades that make the most noise? ---------------------------- Trust me. *The engine is loud. The prop is much, much, louder. Eisboch Yes, go to an air show sometime and listen to a PiTT Special or a Citaborea make a low altitude fast fly-by. BWWWWWWAAAAAAAAAAAAAAAAHHHHHHHHHH! The noise you actually are hearing is the prop beating the air. then after they make the pass they get a lot quieter and you hear the engine rumble. What's cool is if somebody comes up with an old WW2 Corsair *and makes a fly-by. Yes, you hear a tremendous noise coming fromt he prop then when they pass you hear that marvelous "gallop:" of the Pratt 'n Whitney radial! My uncle worked on Corsairs as a CPO. I've got Navy ww2 service manuals his tech school manuals, etc. Really nice to have! What is cool about them is that again, they didn't just go to the store to buy a part, they made a lot of parts so the manuals go into great detail. Another interesting thing is when you are standing close to an airplane and they are checking it out and at a certain RPM they go through the range of prop pitches. Sounds a whole lot different between fully pitched and feathered. |
Damned airboats
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Damned airboats
On Sep 9, 2:47*pm, (Richard Casady) wrote:
On Tue, 9 Sep 2008 07:19:30 -0700 (PDT), wrote: and at a certain RPM they go through the range of prop pitches. Those props have a governor that keeps the speed constant, regardless, within limits, of load or throttle setting. More usual to go through the range of pitches by varying the RPM with the prop governor. That's the way everyone I ever knew did it. An airboat doesn't need a variable pitch prop, as it doesn't climb and dive. Casady Richard, I fully understand an airboat doesn't need a vari-pitch prop. It would be fun to try one to see the difference in the hole shot, though! When testing controls, it's common to set the RPM's to a certain setting, more akin to a fast idle, and run the pitch controls through the range. The prop governor isn't a factor at these low RPM's. |
Damned airboats
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Damned airboats
On Tue, 09 Sep 2008 19:26:53 -0400, DK wrote:
wrote: On Sep 8, 7:12 pm, wrote: On Mon, 8 Sep 2008 18:32:05 -0400, "Eisboch" wrote: wrote in message ... WTF? Can't they put a muffler system on them, or is it the blades that make the most noise? ---------------------------- Trust me. The engine is loud. The prop is much, much, louder. Eisboch Down at Wootens the make the passengers and the drivers wear ear protection. I don't know of anyone who doesn't. I do know a couple guys down in Everglades City who have airboats. So, why not put a shroud round the prop, it shoudl at least silence it some? No ear protection offered here. The boats are load at WOT but not deafening. http://www.evergladesholidaypark.com/airboats.html Looks like each engine goes into a dual exhaust with some big mufflers. When I rode, we were given ear muffs. The operator was wearing them also. |
Damned airboats
wrote:
On Tue, 09 Sep 2008 19:26:53 -0400, DK wrote: wrote: On Sep 8, 7:12 pm, wrote: On Mon, 8 Sep 2008 18:32:05 -0400, "Eisboch" wrote: wrote in message ... WTF? Can't they put a muffler system on them, or is it the blades that make the most noise? ---------------------------- Trust me. The engine is loud. The prop is much, much, louder. Eisboch Down at Wootens the make the passengers and the drivers wear ear protection. I don't know of anyone who doesn't. I do know a couple guys down in Everglades City who have airboats. So, why not put a shroud round the prop, it shoudl at least silence it some? No ear protection offered here. The boats are load at WOT but not deafening. http://www.evergladesholidaypark.com/airboats.html \ The owner says he has never heard a complaint. Aside from the particular sound pressure levels, how is an airboat supposed to sound much different than a low-flying (very low flying) single-engine prop airplane right over your house or in your front yard? When we lived in Florida, we weren't very far from the St. Augustine airport. The airport generated some loud noises once in a while, when the military reservists played with their jet engine, but we rarely heard any sounds from the general aviation craft, prop or jet, or even the small commercial jets that landed there. Even the seaplanes were quieter than the airboats. On weekends, before we got some enforcement of noise pollution measures, we had a couple of airboaters whose special delight seemed to be to get an early Sunday morning start. |
Damned airboats
"John H" wrote in message ... On Tue, 09 Sep 2008 19:26:53 -0400, DK wrote: wrote: On Sep 8, 7:12 pm, wrote: On Mon, 8 Sep 2008 18:32:05 -0400, "Eisboch" wrote: wrote in message ... WTF? Can't they put a muffler system on them, or is it the blades that make the most noise? ---------------------------- Trust me. The engine is loud. The prop is much, much, louder. Eisboch Down at Wootens the make the passengers and the drivers wear ear protection. I don't know of anyone who doesn't. I do know a couple guys down in Everglades City who have airboats. So, why not put a shroud round the prop, it shoudl at least silence it some? No ear protection offered here. The boats are load at WOT but not deafening. http://www.evergladesholidaypark.com/airboats.html Looks like each engine goes into a dual exhaust with some big mufflers. When I rode, we were given ear muffs. The operator was wearing them also. I just had a flashback to some television series of years ago that featured cops or some agency roaring around on airboats. Can't remember the name of the show. Eisboch |
Damned airboats
Eisboch wrote:
"John H" wrote in message ... On Tue, 09 Sep 2008 19:26:53 -0400, DK wrote: wrote: On Sep 8, 7:12 pm, wrote: On Mon, 8 Sep 2008 18:32:05 -0400, "Eisboch" wrote: wrote in message ... WTF? Can't they put a muffler system on them, or is it the blades that make the most noise? ---------------------------- Trust me. The engine is loud. The prop is much, much, louder. Eisboch Down at Wootens the make the passengers and the drivers wear ear protection. I don't know of anyone who doesn't. I do know a couple guys down in Everglades City who have airboats. So, why not put a shroud round the prop, it shoudl at least silence it some? No ear protection offered here. The boats are load at WOT but not deafening. http://www.evergladesholidaypark.com/airboats.html Looks like each engine goes into a dual exhaust with some big mufflers. When I rode, we were given ear muffs. The operator was wearing them also. I just had a flashback to some television series of years ago that featured cops or some agency roaring around on airboats. Can't remember the name of the show. Eisboch Ahhh, the mind is the 2nd thing to go. ;) I think you are thinking about Flipper. The dad was a Park Ranger. |
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