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Unlimited Class-exhaust c/w MUFFLER ???

 
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SouthIdahoGary



Joined: 15 Jun 2005
Posts: 295
Location: Wilder, ID, USA

PostPosted: Thu Jan 27, 2011 1:49 pm    Post subject: Unlimited Class-exhaust c/w MUFFLER ??? Reply with quote

Quote:
Unlimited engine restrictions or modifications, any exhaust c/w mufflers

How do you accomplish the mufflers part on a TURBINE powered Unlimited boat?? Shocked That is going to be an interesting device.....

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hellsgate



Joined: 07 Oct 2009
Posts: 26
Location: Clarkston, WA

PostPosted: Thu Jan 27, 2011 2:27 pm    Post subject: turbine silencer Reply with quote

It's possible, but less effective on turboshafts where the power turbine substantially reduces the kinetic energy of the outflow. Methods use water injection and/or mixing with bypass/cooling air (see pic). The spec could be rewritten to exclude turbines, or base the limitation upon a weighted spectral noise measurement at distance (off-axis), and since high frequencies don't travel far, nearly all turbine boats would meet that spec by default.


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SouthIdahoGary



Joined: 15 Jun 2005
Posts: 295
Location: Wilder, ID, USA

PostPosted: Thu Jan 27, 2011 2:37 pm    Post subject: Reply with quote

Quote:
The spec could be rewritten to exclude turbines


and then the fight began...... Laughing Laughing

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hellsgate



Joined: 07 Oct 2009
Posts: 26
Location: Clarkston, WA

PostPosted: Thu Jan 27, 2011 2:44 pm    Post subject: Reply with quote

SouthIdahoGary wrote:
Quote:
The spec could be rewritten to exclude turbines


and then the fight began...... Laughing Laughing


Ack! Let me rephrase that: The noise spec could be rewritten to exempt turbines... Cool

Unlimited hydroplanes are losing some followers because they say the 'hairdryers' are just too quiet. There's only one piston H1 left: U-3, and it hasn't run in a couple years, but its thunderous rumble usually steals the show.

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Arthur
Outlaw Eagle Admin


Joined: 28 Oct 2006
Posts: 1648
Location: On the rocks

PostPosted: Thu Jan 27, 2011 8:47 pm    Post subject: Reply with quote

All Supercross and Motocross bikes in the AMA must pass a decibale test. Because of the four stroke era we live in now the bikes are just too damn loud and it's generating complaints from land owners near the tracks. Shouldn't be as big as deal on a river I would imagine.....
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YKX



Joined: 21 Jul 2005
Posts: 181
Location: Yellowknife

PostPosted: Tue Feb 01, 2011 11:09 am    Post subject: loudness Reply with quote

Arthur 2 wrote:
All Supercross and Motocross bikes in the AMA must pass a decibale test. Because of the four stroke era we live in now the bikes are just too damn loud and it's generating complaints from land owners near the tracks. Shouldn't be as big as deal on a river I would imagine.....


"NOT YET" is the question......
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werntonb



Joined: 08 Feb 2011
Posts: 3
Location: Alexandria, Virginia

PostPosted: Tue Feb 15, 2011 1:34 am    Post subject: Re: turbine silencer Reply with quote

hellsgate wrote:
It's possible, but less effective on turboshafts where the power turbine substantially reduces the kinetic energy of the outflow. Methods use water injection and/or mixing with bypass/cooling air (see pic). The spec could be rewritten to exclude turbines, or base the limitation upon a weighted spectral noise measurement at distance (off-axis), and since high frequencies don't travel far, nearly all turbine boats would meet that spec by default.


It looks like my turbo silencer. I am just curious, how much is the price of it nowadays?
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