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SouthIdahoGary
Joined: 15 Jun 2005
Posts: 295
Location: Wilder, ID, USA
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 Posted: Thu Jan 27, 2011 1:49 pm Post subject: Unlimited Class-exhaust c/w MUFFLER ??? |
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| Quote: | | Unlimited engine restrictions or modifications, any exhaust c/w mufflers |
How do you accomplish the mufflers part on a TURBINE powered Unlimited boat??  That is going to be an interesting device.....
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"faster, Faster, FASTER until the thrill of speed overcomes the fear of DEATH"#163 "Tuff-n'-Nuff" |
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hellsgate
Joined: 07 Oct 2009
Posts: 26
Location: Clarkston, WA
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| Posted: Thu Jan 27, 2011 2:27 pm Post subject: turbine silencer |
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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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Roads? Where we're going, we don't need roads. |
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SouthIdahoGary
Joined: 15 Jun 2005
Posts: 295
Location: Wilder, ID, USA
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| Posted: Thu Jan 27, 2011 2:37 pm Post subject: |
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| Quote: | | The spec could be rewritten to exclude turbines |
and then the fight began...... 
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"faster, Faster, FASTER until the thrill of speed overcomes the fear of DEATH"#163 "Tuff-n'-Nuff" |
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hellsgate
Joined: 07 Oct 2009
Posts: 26
Location: Clarkston, WA
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| Posted: Thu Jan 27, 2011 2:44 pm Post subject: |
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| SouthIdahoGary wrote: | | Quote: | | The spec could be rewritten to exclude turbines |
and then the fight began...... |
Ack! Let me rephrase that: The noise spec could be rewritten to exempt turbines... 
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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Roads? Where we're going, we don't need roads. |
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Arthur
Outlaw Eagle Admin
Joined: 28 Oct 2006
Posts: 1654
Location: On the rocks
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| Posted: Thu Jan 27, 2011 8:47 pm Post subject: |
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| 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
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| Posted: Tue Feb 01, 2011 11:09 am Post subject: loudness |
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| 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
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| Posted: Tue Feb 15, 2011 1:34 am Post subject: Re: turbine silencer |
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| 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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