So I started playing with hydrofoil designs today in an attempt to really dial in a DIY design before I embark on the project. I'm trying to go as simple as possible, while at the same time ending up with a kick ass setup. Here's what I've got so far. Feedback is truly appreciated.
1. Strut - 1 meter long, Symmetric Eppler 817 profile with a 15 mm camber and 120 mm cord.
Proposed construction: Molded or Vac Bagged. Carbon/Epoxy
Layup: Glass, -45, +45, 0, 90, Core (unknown), 90, 0 +45, -45, Glass (lots of 45s on outside. evidently torsion is killer). Cloth Weight: Unknown
Flange Mount to Board
2. Front Wing - 520 cm span, Assymetric Eppler 837 profile with 12 mm camber and 87 mm avg cord.
Area: ~450 cm2, 75 mm anhedral from center to tip. Aspect Ratio: ~6
Proposed construction: Molded or Vac Bagged. Carbon/Epoxy
Layup: Glass, 0, -45, +45, 90, Core (unknown), 90,+45, -45, 0, Glass (lots of 0s on outside for high bending stiffness). Cloth Weight: Unknown
3. Fuselage - 750 mm from centroid front wing to centroid rear wing. Front wing TE 100 mm forward of strut LE.
25.4 mm (1 in) dia Carbon Pulltrusion ($144 for 48 in
http://www.acpsales.com/Carbon-Fiber-Rods.html)
4. Rear Wing -364 cm span, Assymetric Eppler 837 profile with 8.4 mm camber and 61 mm avg cord.
0.5 x area of front wing. Upside Down profile to create nose lifting pitch moment. 53 mm dihedral.
Proposed construction: Molded or Vac Bagged. Carbon/Epoxy
Layup: Glass, 0, -45, +45, 90, Core (unknown), 90,+45, -45, 0, Glass (lots of 0s on outside for high bending stiffness). Cloth Weight: Unknown
5. Board: Whatever I have lying around collecting dust. Preferably something with length forward of the front straps so help ease the noseplants.
Wings are a little higher aspect so they'll have a higher l/d ratio. I went with a little sweep and an AR of 6. It'll be a little harder to learn on but it'll be better after some practice. I just don't want to invest a bunch of time/money on beginner wings and then want something better after 3 sessions.
Right now I am leaning towards internet ordered 3D printed cores with vac bag carbon/glass reinforcement.
Designing the joints is going to be a lot of the effort and is what I'll be obsessing about at all waking hours until I get it figured out.
I would really appreciate any time taken to trash these ideas/specs so I can learn from the community. And I'd be happy to provide the resulting 3D models to the community along with methods/process/materials that have yielded results for me.