Pic of stepped hull in action from underneath
03-21-2013 | 08:45 AM
#21
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From: Charlotte Mi.
03-21-2013 | 08:59 AM
#22
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From: St. Pete Beach, FL
Some thoughts or questions using the pic in post #1 as an example.
The weight of a boat is unchanged. Since part of it is riding on air it makes sense (to me anyway) that those portions not aerated are supporting the weight displaced by the air?
Is there an engineer here that can make some sense of this?
The weight of a boat is unchanged. Since part of it is riding on air it makes sense (to me anyway) that those portions not aerated are supporting the weight displaced by the air?
Is there an engineer here that can make some sense of this?
The helpful part is that the wetted surface area of the hull is much less. This reduces the hydrodynamic drag.
The quality of water of that gives it "surface tension" also causes it to want to stick to things. A boat comes in contact with lots of water then attempts to break free of it as well.
03-21-2013 | 10:56 AM
#23
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I think the next improvement will be a surface coating that mimics shark skin
it looks like one has been invented and is going to be applied to airplanes and I think it is only a mater of time until it winds up in the marine market
http://travel.cnn.com/lufthansa-tests-shark-skin-881186
it looks like one has been invented and is going to be applied to airplanes and I think it is only a mater of time until it winds up in the marine market
http://travel.cnn.com/lufthansa-tests-shark-skin-881186
03-21-2013 | 12:40 PM
#24
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From: St. Pete Beach, FL
I think the next improvement will be a surface coating that mimics shark skin
it looks like one has been invented and is going to be applied to airplanes and I think it is only a mater of time until it winds up in the marine market
http://travel.cnn.com/lufthansa-tests-shark-skin-881186
it looks like one has been invented and is going to be applied to airplanes and I think it is only a mater of time until it winds up in the marine market
http://travel.cnn.com/lufthansa-tests-shark-skin-881186
03-21-2013 | 01:28 PM
#26
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From: OK CIty, OK
Yeah, it seems counterintuitive, but properly designed rough surfaces or ridges can help break the boundary layer of stagnant fluid off of a surface. That's the reason your radio antenna on your car and the hull of a round semisubmersible drilling rig will have a corkscrew rib running around them.
03-21-2013 | 01:33 PM
#27
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From: Raystown Lake , Pa.
03-21-2013 | 03:20 PM
#29
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From: Florida
Try to get a hold off Kevin Sceba at Merc Racing or Harry Schull in Pompano Beach, FL. they might have the records. Ken Kawl, VP at the time at Merc. is retired. All my "pre June, 1994 stuff is with my "x'". Test date around late 93-early 94. (don't even remember anymore.) John Simpson (sp?)owner of Challenger Offshore at the time is gone AWOL. I can't even find him. Brownie might have some contact and misc. info. too. I have some old VCR vids the 32' (hull no. 1) with twin 502 Blackhawks running and "parked" at the Pier 33/Thunder marine 1995 Poker Run, (mayden voyage sort of speak) but not underwater.
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