Thought I’d share my progress on my eFoil build—just in case it blows up! 
I set out to design and build a fully functional eFoil from scratch, including the wingset and foam board. I haven’t seen many DIY attempts that cover everything successfully, so that became my main goal.
After months of research, I started this project with a strict $700 budget (which, of course, I ended up stretching for last-minute fixes). Now, with the weather warming up, I’m just a few days away from testing it out!
For the wingset, I designed everything in Fusion 360, using inspiration from FoilZone and the NACA 23015 profile. I sized it based on my weight and the final board concept, then 3D-printed the parts before reinforcing them with marine epoxy and multiple layers of hand-laminated carbon fiber. I ended up with a surprisingly stiff and solid wing.
The board itself is made from EPS insulation foam, which I spent hours sanding and painting to get somewhat flat. It was my first time working with fiberglass, and while I’m happy with how it turned out, I now know plenty of ways I could’ve saved time (and frustration).
For power, I’m running a Flipsky 6374 outrunner motor with a 12s 4p battery and a Flipsky VESC. The quality of Flipsky’s components seems great so far—though the real test will be how they hold up in the water.
Cant add more photos here so check out: joshuadlu.com