I am making a 1100-1200 cm2 wing with a 817 profile and dimensions quite similar to a LF impulse. Now it is time to design the rear stab and I have a lot of questions:
- Does it make any sense to put any kind of asymmetric profile in the rear stab? or just asymmetric shape works well? I think I have seen some foils with a inverse profile that pushes down.
- Will I obtain any practical benefit with anhedral or dihedral shapes vs flat? Of course making it flat is much easier. My goal is a stable foil to practice my footwork at low speeds and I like to carve and eventually want to play in small waves. Any special stab shape/profile to favor that style?
- Size: Is there any proportion rule between the size of the front wing and the rear stab? I guess it largely depends on the distance between them, so Initially I will be using the 78cm LF aluminum fuselage, which I now use with the stab at the most forward position (Rocket foil) to favor turnability.
Your surf wing is for kitefoiling?
I have built a Eppler 817 64cm 800-850 qm. Fuse 74cm. The Stab is about 1/3 of the Fwing surface. Normaly a asymmetric profile is used. Mine came out pretty symmetric mustache style. Symmetric needs a bit more angle than the asymmetric. Dihedral gives you better yaw stability, or you use a TT fin.
Eppler 817 isn't easy to build bc the concave at the TE. Keep in mind what will be your aimed thikness.
For example the Levitaz cruizer is 15mm , Moses 633 30mm. Imho a big slow foil doesn't need a complex profile. Play at airfoiltools with the bottom flat profiles, much easier to build.