So today we finally managed to do the maiden of our jet-driven eFoil.
Setup:
Fliteboard Pro
Gong V3 mast with our new V3 Gong <> Fliteboard adapter (more info soon)
Old Gong wing (forgot the size, will update later)
Flipsky 75200 VESC
Battery: 16S12P
Manta remote
JetWave motor (no data available, but from our calculations/measurements it’s a 270KV motor with 16 poles / 8 pairs)
JetWave jet (not like all the others! It’s a real jet, not a ducted fan)
Since the JetWave batteries are 12S, we needed to set the ERPM lower. It’s still way too high as the jet starts making foam about 1/2 way throttle
It’s also way too powerful at the lower part of the RPM range, so we’ll need to adjust some settings in the remote/VESC.
As it was getting late, we didn’t have time to take any measurements.
I’ll update this thread as soon as we have more data.
One more thing. The plan is to get rid of the backpart of the fuselage, and connect the stab to the jet
Wow, as always very nice and very clean work @Kian! Did you just order the motor and jet directly from jet wave? Curious what the efficiency looks like.
@windego
During testing, we needed to run just the motor.
On 12S, not limited, it reached just under 12,000 RPM. Wow… what a sound!
It was almost scary, but in the water it’s nice and quiet.
We’re now trying to find the correct eRPM for this setup (16S) and still need to do a lot of tuning!
And yes, lots of power, but due to too many RPMs and a very sensitive trigger, it’s too easy to overpower, causing the jet to start making foam (needs tuning)
@S_Roger
We live about half an hour’s drive from the European distributor, but unfortunately they don’t want to sell to DIY’ers. Maybe it’s because the motors/jets are hard to get (being a new company?).
We managed to get hold of a jet/motor by going a different route (through a dealer far away). Not sure if we’ll be able to do that again.
We’ll definitely upload some videos once we’ve got things dialed in!
I’m sure you have likely already considered modifying throttle curve and other parameters on the Manta - there are a bunch of things on the new VX5 that might help.
Can’t wait to see this in action - mount it on that monofoil and it will truly be Frank!
You are correct about the profile settings in the Manta, and we are staying away from the VX5 for now, as we already have enough remotes here (by the way, it’s not as good as you think it is!).
The jet generates so much power at the lower end that the mono wing might not be usable, since it’s more pitch sensitive than a wing with a stabilizer.
Maybe after some tuning it will become more controllable, and who knows, we might give the mono wing a try.
(by the way, it’s not as good as you think it is!).