I'm sure you have all seen the videos of Laird riding that hydrofoil toe-in board.
Here is my question. Is it possible to build a paddle-in board with a big winged fin that can generate enough lift to raise the board -- and rider -- out of the water?
Has anyone ever dabbled with this?
Mon, 2007-08-27 23:23
#1
Yes. Look for surffoils' posts. You'll see what he's all about.
How would you trim down the line if your foils were only half-in though? I was wondering about this exact thing just this morning. I'm all about seeing the video if it works.
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I imagine that your foils would have to be wider than your board to fit in the pocket. What about having two foils? One cannard, up in the front like a hammerhead, and one in the middle to back region. That might add some stability, and provide more lift. I'm not sure how you would turn without a rudder, though.
I'm thinking that for it to work you would have to be able to generate enough speed at the drop-in phase to lift you up onto the foil(s),before turning into the wave.
I dunno.
Um. You done with that wooden board then?
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I'm just daydreaming right now. My wife and I have this weight loss challenge going on right now. My goal is to get below 195 lbs, and then I get to buy wood for my next board. I started out at 210, and I'm now at 199. It won't be long now!
Here is something else I have been dreaming about lately. I'm not sure about the bottom contours yet. It would be nice to see an alaia up close sometime.
1025812_my_alaia.pdf
Swied,
Hmm. I would like to see the avatar board without its appendage.
I drew one of them things too, but mine's hulled out, kinda. http://i118.photobucket.com/...ula.jpg?t=1188276780
I had belly in mind for about 2 feet somewhere in the middle. Beveled rails, thin, but probably not kill-you-if-it-hits-you-thin.
Mine might even have some long low keels going back toward the corners.
Swied,
Your alaia shape looks good. Could probably go thinner and narrower though, it doesn't have to float you. A cheap but fun prototype can be made from redwood fence boards. Just pick through and find some good boards. Don't overthink it, just make it.
Also I belive Tom Wegner's brother shapes alaias in So. Cal.
-Brian
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Since you didn't specify how the board is to be ridden, here's a picture of the prototype of a paddle-in hydrofoil paipo board (seventh in a series of such boards and first ridden in 2002). The details of the full-featured version (which is presently under construction, along with the tooling) can be found at the US Patent Office (US-PTO# 7,144,285).
http://www.uspto.gov/patft/index.html
Like an aircraft, it turns by banking the board (which requires minimal effort).
The design objective was maximum maneuverability (with minimal loss of speed) -- which, as with an aerobatic or air combat aircraft, means minimum stability. The weak stability means that probably it cannot be ridden in the standing position (evidence: several persons who have ridden it said in advance that they were going to try standing up, but so far not one of them has actually tried to do so).
The optimization of the triad of stability, maneuverability, and speed can be altered by changing the foil and strut dimensions and configurations, but changing one affects the other two. In particular, achieving more stability would generally reduce maneuverability and speed potential. Part of the loss of maneuverability would be associated with the new configuration, but in addition, the standing position (vs riding prone) increases (substantially) the moment-of-inertia about the roll axis, thus resulting in a slower entry into, and exit from, a turning (rolling) maneuver.
The full-featured version has active, rider-directed controls which are expected to further enhance maneuvering capability while at the same time providing greater control. These controls would not be available to a standing rider.
[swied] (and anyone else in the San Diego/North County area) You're welcome to try the board for yourself.
Markup : That's exactly what I was look for! Very cool design. It looks fun to ride. I would definitely look to try it out. I'll send you a PM.
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I don't know about with surfboards...but if they do start experimenting they should have a look at what these folks are doing- the International Moth sailboat class. These little boats get up and plane with very little wind.
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