The other thing to consider is that the rider will generally move forward on the board when the foil is moved forward.
To fly straight the force of gravity acting on the whole system needs to be equal to the lift generated by the foil, and the effective summed location of the COGs of the rider + board + foil must be directly above the effective centre of lift. By effective I mean taking into account the moment generated by the stab so your picture can be representative assuming different stabilizer shimming.
Continuing the idea that you shouldnāt foil drive onto waves but rather chip into waves, because the trim will be better
This video is a perfect example of why motoring on foil onto waves is a complete disaster. Also a good example of why efoiling looks so terrible on wave when done this way.
Note how he has to pump while on foil even though the wave has plenty of energy. This is because so far forward. And the turns are terrible and keep bogging.
He is standing at least 30cm forward of where he should be standing, and it shows. This is exactly the issue
Riding a foil without a stab is possibly a good way to feel out the trim of a foil, as the idea behind this thread is that you should be standing in such a way that the stab is not used at all, in which case youād not miss it much if you removed it
So in the plane analogy the back foot is your elevator and all pitch control happens via back foot pressure. If you were to stand on the front foot and balance you would glide fully trimmed. So instead of pushing down with your front foot during a pump think about lifting the back foot. This doesnāt seem to be what Kane does as his back heel never even comes up (in that video anyway).
I disagree with that one personally. Iām working pretty hard to get weight equal on both feet when gliding and when pumping. For downwinding it is almost a requirement or youāll burn out one leg fast
Yeah I donāt think it would work either unless you had a back foot strap to pull up like a planeās elevator can do. So the question still remains where it might be best to have your your feet. Obviously your front foot needs to be forward of the main wing and your back foot behind it.
Watch how the feet shift in this clip. The paddle up is further forward to get the board moving, but as soon as the foil is properly lifting the feet are moving back to get the optimal trim. Notice at the end how the slow down to a stall leads to the angle of attack going very high right before the stall, that is what a well trimmed foil does when it stalls, it ārears upā. If you are stalling and touch nose down first or flat when you stall, youāre too far forward.
if one canāt imagine oneās own foil turning like that itās because 1- one is standing too far forward, 2-leading to bogging turns because one loses lift as soon as one puts it on the rail, 3- leading to oneās itch to buy a ābetter foilā which one will also stand too far forward on
I jumped off my foil while pumping at efficient speed, and the board kept gliding perfectly, for about 10m before it slowed down, nosed up and stalled.
Do you think roughly that that is the equivalent to your balance trim advice? Where the board is neither nose heavy or tail heavy, and maximises glide?
