A kite that's "way too big for the wind speed", as per my example, will fly at a significant downwind angle when depowered for survival. Only at very small angles of attack. Yes, that's what "way too big for wind speed...survival" refers to. Based on the Peter Lynn graph you attached, even just dep...
To illustrate, riding really fast on a current generation foil board is like flying a kite that's way too big for the wind speed. In both cases you can compensate by reducing the AoA (depowering), but that results in a drastically reduced L/D ratio, which limits performance... But that's not right,...
Photos from many years ago TT S P F KBHFs... Interesting pictures. I notice that the collective lifting surfaces are huge compared to current generation foil boards, and I believe the heavily-dihedral geometry, likely derived from foil boats, is less than ideal for foil boards. (Seems analogous to ...
If the CG is moved forward or rearward on a glider, you can reestablish the almost identical same speed and glide angle by trimming the elevator, yes. BUT, you have the same AOA, and not a different one :naughty: If the speed is almost identical, it means it’s not identical. If the speed is not ide...
The two causes of AoA changes can be induced by the following means: SPEED: by pitching the board upward or downward Yes, and this is done by changing front to back weight distribution, changing A o A, like I said in my "on topic" reply concerning how to control a SPF, when you said not. J S quotes...
This pervasive AoA matter (which isn't actually the topic of this thread) is summarized by this, quoted from the beginning of the second page: For a fixed, submerged hydrofoil, AoA only changes due to speed (faster: lesser AoA) and rider's effective* weight (heavier rider: greater AoA). *I mean effe...
Maybe you're thinking too much in terms of gliders? At first I took this merely as rhetoric, but since you've repeated it, if it were grammatically structured as a question, the answer would be no. Gliders didn't cross my mind because they have variable control surfaces whereas foil boards do not, ...
So, my questions is: “Is the challenge #2 to get some kind of ‘hull’ up and out of the water, so it can ‘skip’ really fast on the waves”? Sort of. That's not a bad analogy. Even though a nicely-shaped skipping stone might get vastly more lift for skipping if it penetrated below the surface on each ...
And please address this, again from wiki; "Fully submerged hydrofoils are less subject to the effects of wave action, and are therefore more stable at sea and are more comfortable for the crew and passengers. This type of configuration, however, is not self-stabilizing. The angle of attack on the h...