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18-05-2004, 05:31 PM
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#41
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hello
Join Date: Mar 2004
Posts: 2,739
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The torque from the contra rotating props will cancel each other out making for a more stable ride
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18-05-2004, 05:43 PM
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#42
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The Doc
Join Date: Mar 2004
Posts: 8,287
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I apreciate that, but just thought that the extra drag fromt the legs sitting outside of the hull would result in a significant speed loss.
Mind you, all of this is relative to the amount of frickin HP its got....and it don't look like its lacking much!
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18-05-2004, 05:54 PM
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#43
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Pension Dodger
Country: UK
Location: KENT
Occupation: IT
Interests: Offshore water ski racing
Cruising area: !!!!!!!!!
Join Date: May 2004
Location: KENT
Posts: 442
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I agree it looks odd, still it pulled Marty Wells to be the 2003 World champion.
I am told that the 2 rubber tubes on the outdrives sucked in air to give the props some air on pullout, seemed to work well always got a good hole shot
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18-05-2004, 06:18 PM
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#44
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numbskull
Country: United Kingdom
Location: South
Occupation: none
Interests: none
Boat name: Leviathan
Boat make: Phantom 28
Cruising area: South Coast
Join Date: Mar 2004
Location: South
Posts: 15,959
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All that power through a single drive would be a handfull to say the least!, I'd be there with the twins everytime.
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"I Agree with everything you say really!" - John Cooke to Jon Fuller - 26-01-2013
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18-05-2004, 06:26 PM
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#45
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hello
Join Date: Mar 2004
Posts: 2,739
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Yep, similar boats over here are typically 1200hp, and thats alot!!!
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18-05-2004, 07:23 PM
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#46
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BananaShark Member
Country: UK
Location: Salcombe South Devon
Occupation: Racer and builder
Interests: Winning races
Boat name: BananaShark
Boat make: BananaShark 34' Race
Engines: Twin Yanmar BY 260's
Join Date: Mar 2004
Location: Salcombe South Devon
Posts: 4,635
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Quote:
Originally posted by dbe1
I am told that the 2 rubber tubes on the outdrives sucked in air to give the props some air on pullout, seemed to work well always got a good hole shot
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Spot on and without lifters they allow you to spin the props up and not bog the engine down, giving better acceleration.
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Cookee
British Champions! RIB Formula 1 2005
National Speed Record Holder at 90.15 (still)
www.bananasharkracing.com
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21-05-2004, 12:04 PM
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#47
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Pension Dodger
Country: UK
Location: KENT
Occupation: IT
Interests: Offshore water ski racing
Cruising area: !!!!!!!!!
Join Date: May 2004
Location: KENT
Posts: 442
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The twin engine boat had a compressed air tank on-board that they used to pump air under the drives, again to allow the props to spin.
I have a picture of the stern showing the outdrives that I will find and post later.
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24-05-2004, 11:07 AM
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#48
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Pension Dodger
Country: UK
Location: KENT
Occupation: IT
Interests: Offshore water ski racing
Cruising area: !!!!!!!!!
Join Date: May 2004
Location: KENT
Posts: 442
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24-05-2004, 01:27 PM
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#49
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Registered User
Country: guernsey
Occupation: soon to be marine engineer... i hope
Interests: boats cars bikes music
Boat name: Any suggestions??
Boat make: shakespeare 17
Engines: none yet
Cruising area: channel island
Join Date: May 2004
Posts: 12
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sitting one engine infront of the other like in the pictures 3 up, would that not make the boat less balanced.
could you use one engine 2 drives like you can to steer if you had 2 engines 2 drives?
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