The specs on foils boggle my mind. I have stringy wings, they are dead flat, no AoA adjustment seems to be needed....maybe because I am freeriding, going slow and turning constantly. I copied the stringy wings with g10, but left them thicker. Again, seems "balanced", no issues with porpoising, etc. If anything the ride feels more "cushioned" and maybe a little slower, but more stable. Now I have copied spitfire wings, so far the ride is not so stable, tendency to nose drop (though may just be not used to the different ride yet, not going fast enough to engage the wings). Anyways, I have a basic understanding of the concept of increasing AoA to either increase lift on front wing or increase drag on stab wing. But how to play with this when both wings are providing lift? Hmm. Going to take some playing around this summer, as I can't quite reason out which wing to raise or both.
I wish I could increase the angle of attack of my Zeeko White & Green main wing (without affecting the difference with the stab) by a few degrees to prevent the board's attitude to point upwards (see attached picture) in order to make the stance more comfortable as I was used to with the Cab DA I learned with. At the moment, I'm forced to ride front leg bent and back leg straight, and only in the jibes I don't find it an issue. It had to be the designer (Nico) deliberate goal to have it as it is, perhaps to have softer landings (the tail touching water first), but I'd like to find a way to alter (increas by 4 to 8 degrees) the wings' angle of attack relative to the board. Side theoretical benefit, foiling should occur at a lower speed. I see three ways to achieve that:tahoedirk wrote: ↑Tue Jun 06, 2017 4:32 pm4 degrees is the difference between wing and stab. It might be 1 degree or 5 degrees but it is the difference . The angle relative to the fuselage will affect the angle that the fuse and board travel . I go with 0 degrees on the front because I like the pitch of my board while foiling. I think 3 degrees up would make the fuse perfect for the direction of travel but angle my nose down 3 degrees also. I have not discovered a go to profile yet
A flat bottomed foil can only be symmetrical if the top was also flat.TomW wrote: ↑Sat Jun 03, 2017 4:23 pmI'm interested too.
But I've been reading.
Basically a flat bottom foil will generate less lift when at zero AoA to flow, a foil with shape on bottom will have some lift at zero AoA. So you might need a constant AoA built into the design to generate a certain lift and a specific speed.
Foil designers call a flat bottom foil " symmetrical " and one with shape both sides " asymmetric ".
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