C A R A F I N O 2014 wrote:I see 60% of the board out of the water. So what do you need that part of the board for?
You stopped me just in time! After reading the earlier post I was going to cut the forward 60% of my raceboard offcoleman wrote:the volume in the nose of the race board is what allows the board to pound over the chop at high speed. it provides stability and i am certain it is essential. without there would certainly be a loss of control.
The new trend is pointing to that direction of the new raceboard design what Carafino is talking about.davesails7 wrote:The description of the design philosophy of this raceboard doesn't make sense to me. It jumps back and forth between catamarans, planing hulls, to displacement hulls. A lot of talk about a wave piercing bow, but the nose of the board in the picture is flat, not pointy? Also, how can it be designed to pierce through waves and also create large amounts of lift to lift the nose up over waves?
The sailboat class in your video is a 6.5meter class, they are limited by the length to 6.5m, so it is logical to make a potato looking boat to get the maximum volume. Surfboards are made like that too, so they can easily fit in the trunk. Hydrofoil boards, however spend most of the time not touching water, so a big fat board will be a liability in terms of aerodynamic drag in the air, and hydrodynamic drag when touching water.Hydro Phil wrote:Hi Hawaiis,
I really appeciate your wooden foil. Real aloha spirit
By the way, what do we obtain when the orangutan skips the sailboat ?
Something like this ? A monohull climbing to the trees ?
That makes sense. You can't design a foil to create the right amount of lift going 5 knots through the water that also makes the right amount of lift going 40 knots through the water (like the top racers are going on their race foils). The lift (for a given shape, size, angle of attack; ignoring cavitation) is proportional to the velocity squared, so you have 64 times more lift at 40 knots than at 5 knots! You have to design the foil to create the right amount of lift at the higher speeds and you have the larger volume board to float you until you get up to speed.Bradn wrote:similar principle for the moths - they could chuck on larger foils and get up really early but it is more efficient to use smaller foils and in super light wind, just stay off the foils.
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