The pdf icon below will load Shane Chen's 2003 patent for the Aquaskipper.
If you're rushing off to beltsand some wooden foils for a crazy hydrofoil right now, be aware
the foil sections depicted in these diagrams do not resemble the sections of the actual device.
Also bear in mind that Shane's product is well made and it's cheaper to buy one than to spend lots of time building your own.
That said, here are some foil section candidates:
The Eppler E817 and "Ogive" sections are popular with Hydrofoil Society Members
NACA 63412 and H105 are used by the Moth hydrofoil dinghy
and others made by the same folks.