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  #1  
Old 08-11-2008, 11:00 AM
Verytricky Verytricky is offline
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Fastest propellor driven boat - design

If you were given the job of designing the world record propellor driven boat, what would you build?

What engines?

What props?
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Old 08-11-2008, 06:13 PM
Guest625101138 Guest625101138 is offline
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Definitely an air propeller probably driven by a jet turbine.

Rick W
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Old 08-11-2008, 06:28 PM
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the1much the1much is offline
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i would convert a jet plane engine to a jet drive boat,,, with plenty of wing for down force,,hehe
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Old 08-11-2008, 06:46 PM
Guest625101138 Guest625101138 is offline
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Quote:
Originally Posted by the1much View Post
i would convert a jet plane engine to a jet drive boat,,, with plenty of wing for down force,,hehe
Jim
I regularly fly on Q400 aircraft (lengthened version of Dash-8) like this:
http://en.wikipedia.org/wiki/Image:VH-QOH.JPG
Every time I board I admire the prop. These are nice engines with well designed modern 5-blade feathering props. I think you could get a boat to 500kph with one of these and the right aerodynamics to keep it stable.

Not my desired pursuit though. Ken Warby still holds the world water speed record. At least two other well-funded pilots have died trying to better it.

Any water driven prop would be just playing about by comparison - the little league.

Rick W
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Old 08-11-2008, 07:16 PM
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the1much the1much is offline
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you got bigger "nutterz" then me,,,,i wont allow my feet to go past 6',,hehe
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Old 08-12-2008, 04:50 AM
Verytricky Verytricky is offline
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Quote:
Originally Posted by Verytricky View Post
If you were given the job of designing the world record propellor driven boat, what would you build?

OK - I have to make it clearer..

Immersed propellor boat.
ie propulsion gined from the water via a propellor.
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Old 08-12-2008, 04:53 AM
Verytricky Verytricky is offline
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Originally Posted by Rick Willoughby View Post
Any water driven prop would be just playing about by comparison - the little league.
I think the purist in me thinks that the record has to be with propulsion from the water. Jet thrust pushing a boat along the water is not really a boat for me. It is an aroplane using a water runway that cant take off.
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Old 08-12-2008, 06:25 AM
Guest625101138 Guest625101138 is offline
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Quote:
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.... It is an aroplane using a water runway that cant take off.
Don't kid yourself. Anything moving over 100mph will easily take off. That is how most of the pilots get killed:
http://www.youtube.com/watch?v=fL3Vi...eature=related
Aerodynamics play a vital role in stability

Since jet engines have been in common use they have been used for setting water speed records.

Rick W.
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Old 08-12-2008, 07:05 AM
Verytricky Verytricky is offline
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Originally Posted by Rick Willoughby View Post
Don't kid yourself. Anything moving over 100mph will easily take off.
Usually much lower speeds actually...


But that is not the point. Perhaps I should start a new thread.
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  #10  
Old 08-16-2008, 11:23 PM
Dan Ellison Dan Ellison is offline
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Ellison outrigger, twin prop,alchohal or t-55 should run 365mph mile . already ran over 274 1/4 mile from a stop. currently holds all et records in both ihba and sdba. sponsor me and my hull and I guarantee it in 6months!
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  #11  
Old 08-17-2008, 11:08 AM
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alan white alan white is offline
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Duck Heels: A catamaran design where the driver sits recumbant between hulls. His "stirrups" have heels that are like paddles. They enter the water on each half-crank so that pushing the left foot drives the right paddle forward (to illustrate this, imagine biking on a 3" wide beam over water with paddles hanging from your pedals but with no chain on your bike).
Yes you could stay dry with the right design.
This is as simple as it gets. The question is, does efficient human leg "RPM" (80-130 RPM) work with such a design? For instance, if the stroke length is 18", and the RPM 100, that's 300 feet per minute, 18000 ft per hour (3.5 mph)...
Unless one were high enough and the duck heels long enough to sweep 3 ft of water per immersion (7 mph?), or, what if, um... well, at 3.5 mph, might be well suited to human powered harbor tugs (boats that are human powered that guide fat people in innertubes around in busy swimming pools or at the beach). Then that torquey low speed requirement would be ideal. More powerful drivers could move even larger craft, like runabouts or disabled pontoon boats.

Alan
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