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Boat quiet?

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Re: Boat quiet?

Postby Rivernut » Sat Nov 14, 2020 5:52 am

I have people tell me they hear me coming from miles away. On cars they say a cross-pipe helps reduce the sound while increasing performance. My Eagle / Gator has a mild 350 with dual 4” raw water exhaust. a Anyone ever tried a cross-pipe in a boat?
Here’s my contribution to global deafening.

[video] https://m.youtube.com/watch?v=27Q3f4y6at4[/video]

[video] https://m.youtube.com/watch?feature=emb ... 4oJuaAt1RI[/video]
Real Boats Don't Have Propellers!
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Re: Boat quiet?

Postby viking » Sat Nov 14, 2020 11:55 am

Quiet... no wait, my speakers were off. Maybe that's the secret. Install a stereo and turn the speakers off. Then your boat will be quiet.
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Re: Boat quiet?

Postby Rivernut » Sun Nov 15, 2020 12:29 pm

Real Boats Don't Have Propellers!
-- Rivernut

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Re: Boat quiet?

Postby Riverjohn » Sun Nov 15, 2020 12:47 pm

Rivernut wrote:https://www.amazon.com/noise-cancelling-speakers/s?k=noise+cancelling+speakers

Let us know how it works.
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Re: Boat quiet?

Postby hilljackian » Mon Nov 16, 2020 11:31 am

Speaking of air in the pump, many of you will recall the "air-bleed" lines that where on the 3-stage Hamilton (and clone) pumps. The expressed purpose of this system was to quiet the notoriously loud 3-stage. It consisted of a tube that ran from a port in the pump at the transom into the intake housing. It connected atmospheric pressure (through the pump port) to the suction of the intake, which means that air was flowing into the intake of the jet pump. Assumedly it helped because they included this equipment on not only on the old Hamilton's but the current production Flo-Pros.

However, injecting air into the pump is counterintuitive to the common consensus that eliminating air in the pump helps reduce noise. My best effort at getting an answer as to how this air-bleed system worked produced a weak explanation along the lines of "the injected air reduces harmonics in the impellers, thereby reducing noise." Which, to me is equivalent to saying "some kind of magic happens." Can anybody explain this better? Does anybody have a 3-stage with an air-bleed system that can confirm it works to reduce noise?
1984 Weldcraft, 24-FT, 8.1L HO, Hamilton 1031
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