Hey guys, I’ve been lurking in this forum for quite a while now and I’m slowly getting ready on building my first efoil. I’ve built FPV drones and a couple of hobbyist-level microelectronics in the past (working as a software engineer), so the process is not intimidating. However, I got a few questions that I couldn’t answer by googing.
It seems that building an efoil is pretty straight forward; there’s only 1 motor and a big battery.
Please correct me if I’m wrong, but It should go like:
- Calculate how much weight (your body)
- You need to push, for how much time
- Under what kind of conditions
… and start working out your build
- I’m at 95kg
- I hope to get around an hour ± 15m of good time
- And I’m located at Greece. So there might be a few < 0.5m waves, nothing crazy (for now… we got a lot of kitesurf spots which I think I’ll avoid) I’m just doing SUP until now.
So, now that we got those requirements, it boils down to selecting a capable board w/ foil, then selecting a motor capable of producing enough burst thrust to get us up in flight mode and that can sustain enough load to keep us going for about an hour. Building/Picking a battery should be pretty straightforward. Cells in series to meet the power output X cells in parallel to meet capacity. (And hopefully 5kgs won’t destroy the dynamics of the rest of the system).
So, is there any recommendation on what kind of board w/ foil to use for those circumstances?
- gong allvator rise (XL) that I’ve seen getting mentioned a lot doesnt support >85kg if you look at the infographic, but provides a lot of thrust for just wing foiling.
- I’ve also read about rules of thumb like “> 1750cm^2” wings for >95kg surfers, so It’s just hard to select some thing for sure. Not having any formula involved makes the thing way complicated and empirical
- Plus, how big of a mast?
Okay, let’s say that we’ve selected our surfboard and our foil. Got to select a motor and everything else would follow. I see that there are a lot of flipsky builds around here so I took a look around that. I see people using 130-200+ KV motors and I got a few questions:
- For the very big 200+ KV motors that some of you guys use, WHY do you do it? It’s nowhere near the max voltage range of the fattest 14-15-16s battery packs and you should be unable to go above 60-70% sustainable load!
- For the very small 130ish KV motors (down to 6s! 4s was my drone, man!), I understand that it’s sufficient for assistance (to get up) or sup. Why is it mounted higher up on the mast on some builds though.
- Let’s say you get like the 65111 160KV motor. It’s IP68 rated! They’re being sold as waterproof, but are there any steps to take vs. waterproofing and salt corrosion?
That’s a big thread already, and I should be able to make enough progression towards picking every component after getting those questions answered! Thanks In advance guys
PS. Those maytech remotes are kind of expensive, aren’t they? I’m surprised there’s no easy-to-make open source (software+hardware) alternatives out there…