I am working on my own hydrofoils, and need advice. I have my kitesurfing foil finished, at least my first prototype, and have had some success learnignto foil on it.
I want to also put a hydrofoil on my windsurfers. Can anyone who does both answer some questions?
How different is the angle of attack on the rear stabilizer for windsurfing? For a kite hydrofoil, its about 4-6 degrees.
Can you use a smaller mast, even when you get powered up more?
Does the front wing have to be much farther ahead of the mast than a kite foil? Does the rear stabilizer have to be farther back? Does a longer fuselage help? Or should it be shorter?
But not windfoiling as much yet, as kitefoil, as the last is much easier in terms of taking up less space, and you can foil in a much bigger windrange - where you are "parked" on a windfoil if too low wind.
It seems, having measured on my friends veeeery different windfoils, that they often use a bigger rear wing, and lower (more negative) AOA on the rear wing, and position the front wing further forward on the fuselage.
All is (IMO) only to obtain a correct trim, so you can use the normal Tuttle box windsurf boards got.
I have put a new box (KFBox in my case, as I have the Ketos modular foils with different wings and masts) a lot further forward on my windsurfer, to get the trim "right", without changing the kitefoil in any way, just using my big one around 800 cm2.
This way it has a good trim, so I dont need to push hard on my backfoot to elevate the foil, and I can stand in front of the rear strap too, foiling.
The latter would be impossible if too far aft.
I can not say yet, if it works fine or not, as I havent had the time to compare yet (but in time I will, as some of my friends got different windfoils I will try)
Personally, I dont like the idea of making tweaks in the AOA and rear wing size, if ONLY to get it to work with a wrongly positioned Tuttle box as "per se" on standard windsurf boards - and this is why I decided to make my own windfoil using a standard light wind kitefoil, but moving it forward (in two attempts) to get it right.
My third attemp or so with my first setup:
As said, this is purely my personal opinions and thoughts, that I feel something is wrong with the mainstream trim, but I might be wrong, as I ride FAR more kitefoil, and only occasionally windfoil.