Here is a picture of my current DIY wooden hydrofoil wing
Core is red oak (Home Depot)
Core root thickness is 7 mm trailing edge almost paper thin tips 1 mm Airfoil shape Eppler 817 with a 50% reduced cord thickness Core size Wingspan 500 mm Cord length at root 150 mm Cord length at tip 50 mm
4 layers of Home Depot fiber glass on top 5 layers of Home Depot fiberglass on the bottom
Screw holes bored at 1/2 inch and filled with expoy / fiber mix to seal the wood core.
Finished wing has a solid 2 mm fiberglass edge Wingspan 504 mm Cord length at root 154 mm Cord length at tip 54 mm
Much faster than stock MHL front wing. Maybe a little too much flex in the wing. Next version will have a layer of carbon uni top and bottom.
50 hours logged. i keep going a little slow but im still on it! vaccum bag did not tur out perfect but i lack the apropriate vaccum bagging supply. the strut is ready for shaping and vaccum bagging. Hope to have it done this month. cheers, Pedro
55 hours logged final board position pointing up final front adjustment on front wing filling with epoxy for fuselaje to strut connetion. center strut ended being 13 inches from the back of the board. almost ready for maiden voyage!!
with 24.5 chord thickness i made the 3 point stress test on the keel after the final layup. With 75 kilos in the midlle of the keel it deflected 3mm. weight is 2.2 kilos at 24.5mm x 142mm x 870mm i think is stiff as necesary. what do you guys think? ill start on a new keel with a thinner chord (16mm) and longer mast (920mm). the idea is to make upper half in 24mm ans the lower half that goes inthe wáter tapered down to 16mm. that way ill get both stiff and thinner and faster keel.