Hi everyone,
I’m working on my first eFoil build and running into some issues with propeller sizing. My setup:
- Battery: 14s Li-ion
- VESC: Flipsky 75200
- Motor: Flipsky 7070
Everything is mounted and working fine but i have tried two propellers and one is too small the other too big.
1.) Flipsky 3.8” (stock) — too small.
- I hit max ERPM before I can get on foil.
- I’m close to planing up, but not quite there (likely due to my beginner skill level).
- Power tops out around 2200 W
2.) Flite Propeller (Flite Propeller | Fliteboard™ Official Store) — too big/high pitch.
- I hit phase current limits before planing.
- I raised the phase current limit to 130 A and got around 2300 W, but I’m hesitant to go higher since the motor’s rated for 100 A.
Does anyone know how high can I safely set the phase current limit on the 7070 motor, considering it’s water-cooled? I don’t want to set it too high and break anything
Does anyone know of a good propeller for this setup — ideally something between the Flipsky and Flite prop sizes? Anything off the shelf I could just buy?
I don’t have a 3D printer or CAD skills, but open to learning if that’s the best path. Thanks in advance for any suggestions!
You can go higher on phase if your esc/vesc handle it. Most assist on 6384 run upwards of 130-150a phase. Keep in mind vesc reports peak and not rms amps for motor current.
However with 2200w, you should be able to get on foil, but it depends on your weight, foil and board. Techique definitely plays a part too.
Good luck!
Thanks, that’s good to know, I didn’t know that about peak vs rms! But ya I’m almost there if i knew how to pump the foil I could probably do it haha
You shouldn’t need to really “pump” much to get up, unless it really is under powered, but I think 7070 should be enough. Once you are on the board and start giving power to the motor you crawl forward on elbows to keep the nose level. Then pull forward onto your knees, still near the front of the board. Build up more speed, speed is stability. Stand up while keeping a hand on the nose, weight still forward. Then, once standing, and the board is hopefully planing on the surface, if not speed up. Then just a bit of back foot pressure should be all you need to get up on foil
I use Flipsky 7070 and 75200. Motor current is 130A max. I can reach 3600W with my prop. I have tested several printed props but the best result I got with Thai SPS 6" (KKK prop boat on ebay). But it’s a semi-submersible swamp propeller
See more First test on 7070 - failed