Performance Boats

[tis]

Originally Posted by Paugus Bay Resident

I had the test done 6 years ago, so things may have changed. There are a number of reasons., aside from mechanical changes.

1 - Equipment, calibration and the MP operator - I had to do 3 passes at WOT. The MP averaged those 3 passes to come up with a final DB number. So there is variability. Each pass was between 2 - 5 DB different.

2 - Proximity to MP boat - For the 3 WOT passes, I was asked to be 25 off of the MP boats transom (scared the &^%& out of me at 70 mph, and a bit dangerous I thought). A few feet either way can mean a difference difference between pass / fail.

3 - Weather - My first test was postponed due to fog. The MP told me that humidity, wind, etc can effect the result.

You know, I moved to south FL 6 years ago. Amazing that this debate is still going strong. Here, no 150 foot rule, most places, no speed limits. Boats of every size, shape and type. Everyone seems to get along (sometimes tolerate) and enjoy boating. There are boneheads of course but's that's another topic There are a lot of things I miss about living in NH, but this isn't one of them.

I think we did the test about 6 years ago too, maybe longer. It took us 4 or 5 times before we finally passed and it that was just barely a pass. So
I am a little paranoid now that we might get stopped but don't really want to ask for trouble by asking to be tested. WE haven't changed anything mechanically though.

[Paugus Bay Resident]

Originally Posted by tis

I think we did the test about 6 years ago too, maybe longer. It took us 4 or 5 times before we finally passed and it that was just barely a pass. So
I am a little paranoid now that we might get stopped but don't really want to ask for trouble by asking to be tested. WE haven't changed anything mechanically though.

It took me 2 times, and I think my average just barley squeaked under. My fist pass was at 78 and each one got a little bit higher We were all stock (HP500s).

[tis]

Originally Posted by Paugus Bay Resident

It took me 2 times, and I think my average just barley squeaked under. My fist pass was at 78 and each one got a little bit higher We were all stock (HP500s).

I was in the boat with the MP. He was stern but the last time he thanked me for being nice. I asked him if people actually weren't nice to him despite the fact that none of us are happy to be there. He said you wouldn't believe how bad people are. I might not be happy but I was still taught to respect authority. I was sure glad it was finally over after a whole summer of marinas trying to get the boat right, a lot of money, and all those tests. I think we finally passed in Oct. when they did the last test of the year out there.

[Paugus Bay Resident]

Funny thing, I had an older MP in my boat when we did the final round of tests (at Timber). It was a little hairy as we had to go WOT by the MP boat that was about 10' offshore, then take a hard turn to port to clear the point and rocks.

When we were done, the officer thanked me, smiled and said "now I know why you guys like these boats"

I hear you on losing time, I got stopped on a Saturday, and the test was scheduled for the following weekend. That was postponed due to fog. Next week failed and 3rd week passed. Lost almost a full month of boating.

My boat was stock, as delivered by the dealer in Winni. We had a cracked baffle (due to age). Fortunately, that was it.

[tis]

Originally Posted by Paugus Bay Resident

Funny thing, I had an older MP in my boat when we did the final round of tests (at Timber). It was a little hairy as we had to go WOT by the MP boat that was about 10' offshore, then take a hard turn to port to clear the point and rocks.

When we were done, the officer thanked me, smiled and said "now I know why you guys like these boats"

I hear you on losing time, I got stopped on a Saturday, and the test was scheduled for the following weekend. That was postponed due to fog. Next week failed and 3rd week passed. Lost almost a full month of boating.

My boat was stock, as delivered by the dealer in Winni. We had a cracked baffle (due to age). Fortunately, that was it.

We had no idea when we bought ours that it was loud. I just loved the look of the boat and had to have it. We never even tried it out. And the problem was they didn't really know how to fix it. They tried this and then that and then this and then that until it finally passed. I think they were trying to quiet it enough with a major deal. But it didn't work.

[BroadHopper]

Originally Posted by tis

We had no idea when we bought ours that it was loud. I just loved the look of the boat and had to have it. We never even tried it out. And the problem was they didn't really know how to fix it. They tried this and then that and then this and then that until it finally passed. I think they were trying to quiet it enough with a major deal. But it didn't work.

It is a major deal. About a decade ago I receive a quote of about $4,000 to replace the DARPA silencers on my '88 with the newer nonswitchable exhaust. It involves replacing the whole through the hull unit including the headers. For now, it is quiet at WOT as tested a decade ago. Now I am worried about the testing at idle. There is not enough water flowing through the mufflers to quiet the sound.

[SIKSUKR]

Oh come on ApS.You love the sound of noisy aircraft.

http://www.winnipesaukee.com/forums/...ghlight=planes
I believe it is the "usual" Saturday Sukhoi acrobatic monoplane that does loops and spirals above Rattlesnake Island nearly every weekend. Yes, you do have to look up--and it helps to hear it first!

It could be a Yak--they're similar planes, even at 100 feet altitude. Both are equipped with the radial (round) engine that won WWII.

It is the Antonov's radial engine that makes the difference.

Like the sound that a Harley-Davidson makes from its own antique design lineage, a radial engine makes a very distinctive sound: If it's flying over Winnipesaukee, you can detect it.

The radial engine sound has even produced a cottage industry in CD recordings. (You can listen on-line!)
http://www.spitcrazy.com/sounds_of_aviation.htm
http://rareaviation.com/raenfrso.html

One recording company has even added music to the sound:
http://sounddogs.com/results.asp? (Vocals!)

I don't know of any similar recordings of any other engine.

Too, it is the sound of our WWII American "Warbird" legacy. These designs produced engines of 3600+HP from a single engine. Here's the radial engine principle.

Like some boats on Winnipesaukee, Harley-Davidson motorcyclists try to project a kind of "Warbird" image. (Paint jobs, graphics, decals, leather jackets and "character"). It's just ridiculous that our Warbird legacy of WWII could be matched or experienced through paint jobs and appearances: think "poseur". All the other engine sounds that strike my ear at Winnipesaukee are projected through noisy Detroit-Iron exhaust pipes, housed in expensive fiberglass jukeboxes.

http://www.winnipesaukee.com/forums/...ghlight=planes
of us lakeside will be treated to the sound of these Warbirds overhead that's been described as "felt", rather than "heard".

These engines are of a "radial" (round) design, and have a distinctive exhaust note. Instead of the "rap" of the related Harley-Davidson motorcycle engine, listen for the "chuh-chuh-chuh" of those big radials.

So the bottom line is if its a noise others like its not ok but if its noise you like its all good.

[Webbsatwinni]

Originally Posted by SIKSUKR

Oh come on ApS.You love the sound of noisy aircraft.

http://www.winnipesaukee.com/forums/...ghlight=planes
I believe it is the "usual" Saturday Sukhoi acrobatic monoplane that does loops and spirals above Rattlesnake Island nearly every weekend. Yes, you do have to look up--and it helps to hear it first!

It could be a Yak--they're similar planes, even at 100 feet altitude. Both are equipped with the radial (round) engine that won WWII.

It is the Antonov's radial engine that makes the difference.

Like the sound that a Harley-Davidson makes from its own antique design lineage, a radial engine makes a very distinctive sound: If it's flying over Winnipesaukee, you can detect it.

The radial engine sound has even produced a cottage industry in CD recordings. (You can listen on-line!)
http://www.spitcrazy.com/sounds_of_aviation.htm
http://rareaviation.com/raenfrso.html

One recording company has even added music to the sound:
http://sounddogs.com/results.asp? (Vocals!)

I don't know of any similar recordings of any other engine.

Too, it is the sound of our WWII American "Warbird" legacy. These designs produced engines of 3600+HP from a single engine. Here's the radial engine principle.

Like some boats on Winnipesaukee, Harley-Davidson motorcyclists try to project a kind of "Warbird" image. (Paint jobs, graphics, decals, leather jackets and "character"). It's just ridiculous that our Warbird legacy of WWII could be matched or experienced through paint jobs and appearances: think "poseur". All the other engine sounds that strike my ear at Winnipesaukee are projected through noisy Detroit-Iron exhaust pipes, housed in expensive fiberglass jukeboxes.

http://www.winnipesaukee.com/forums/...ghlight=planes
of us lakeside will be treated to the sound of these Warbirds overhead that's been described as "felt", rather than "heard".

These engines are of a "radial" (round) design, and have a distinctive exhaust note. Instead of the "rap" of the related Harley-Davidson motorcycle engine, listen for the "chuh-chuh-chuh" of those big radials.

So the bottom line is if its a noise others like its not ok but if its noise you like its all good.

That sir was the best well researched post I have seen in awhile. The detail is impressive, no matter what side of the debate you are on. Well done!

[RTTOOL]

Originally Posted by Paugus Bay Resident

Funny thing, I had an older MP in my boat when we did the final round of tests (at Timber). It was a little hairy as we had to go WOT by the MP boat that was about 10' offshore, then take a hard turn to port to clear the point and rocks.

When we were done, the officer thanked me, smiled and said "now I know why you guys like these boats"

I hear you on losing time, I got stopped on a Saturday, and the test was scheduled for the following weekend. That was postponed due to fog. Next week failed and 3rd week passed. Lost almost a full month of boating.

My boat was stock, as delivered by the dealer in Winni. We had a cracked baffle (due to age). Fortunately, that was it.

The standard used for the exhaust noise test is ISO 14509. I cant believe that NHMP WOULD PUT a person in danger like that of a mister meaner.the test requires the boat to pass by the sound meter at a distance of 25 meters (82 feet). The boat must be traveling at least 70 kilometers per hour (43.5 mph) or maximum speed. To pass the test the average of the two highest results must not exceed 78 dB(A).

As a point of reference - the sound of water lapping the shore is 75-80 dBA.