I highly doubt there’s a warranty on their boards. I’ve bought surfboards (load and loads) my entire life and to get one replaced under warrantee is near impossible. The mere nature of any board sport means that there’s very little chance damage didn’t happen outside of use…
Are they using this type of strap? https://slingshotaustralia.com.au/products/2019-slingshot-foot-strap-single
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Some brutal crashes!
Water skiers go around 80kph/50mph and seem to do okay/survive on wipeouts. Granted I think 25mph is enough on foil. Best of luck, and ride safe!
Just realised that was a video that’s some nice air, I would be using the duct doing that sort of riding I don’t think it would be too much of an inconvenience when doing big airtime. Having it on might be a challenge for 180’s though.
I’ve figured out why the VESC is showing about 1.5v less than the battery. It’s because the voltage drops across the BMS, wires, battery connectors etc. the VESC is measuring the voltage perfectly at its point of measurement.
I don’t want to mislead anyone when I said the VESC voltage measurement was off above.
Were you seeing that with no/minimal current? Seems like a lots of resistance to be doing that a low currents.
If, for example, you had 1.5V drop at 5A. That would be a .3ohm resistance from the battery ,bms, wiring, to vesc with R=V/I. At 100A with that resistance that would be a 30V drop (V=IR) which is a lot 
Maybe something else in there besides the resistance?
If I had to guess from your data of ~65V at 11A, 63V at 30A, 60V at 55A, around a 3V drop every 25A would be about .12ohms which still seems high, but I don’t have good data on my efoil. At 60A (Power=I^2*R) that is 432W getting put out somewhere! If you can figure that out you’ll have more power to the motor!
Some extra data points while I was thinking about it:
Xt90 connectors have around 0.0003 ohm of resistance.
1 meter of 10awg wire is about 0.003 ohm
one 30Q battery has about .0227 ohm
12p pack of 30q is .0019 ohm
10mm x .15mm strip is .047ohm/meter
Bryce
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What you said makes sense Bryce. I measured 0.6v drop on battery output compared to BMS output at no current. That would leave 0.5v to 1v drop along the connectors and wiring. Definitely doesn’t fully add up with the v=ir Because my wires don’t get that hot. I’ll check what the drop is across the wires.
https://chemandy.com/calculators/rectangular-conductor-resistance-calculator.htm
Each // strip + busbar + Ir cells + wires … connectors ( most are big but there have low contact area inside )
Hey mate, just curious what size silicone cable do you use on the motor pulling this kind of high amp?