I had a few days ago my second test I had much more success than the first one.I tested with a few friends and we managed to get on foil a few times.
I am kind of surprised how inefficient the flipsky flodable prop for the 6385 is, with a 85 kg rider and an xover v3 xxl setup 2900 w on foil. It is while still accelerating and so on, but at this speed the foil should be around 600 w at the most
On other notes i had a recursive ABS_OVER_CURRENT which usually ended with the rider falling down. i am not 100% sure if this is due to battery amps or motor amps, any help would be appreciated!
The biggest problem and the reason why the test got expensive at the end is what I still do not understand. At some point, without further warning the foil stopped working, an i got a MOSFET blown, same as when the cable got cut on the first test. Only this time, no cable was cut, the only thing it happened is that the BMS cutted the power since i had both the BMS and the VESC cut-off at 36 volts (3v per cell).
I think it is unlikely that a BMS cut can kill the ESC, what do you think? this happened under load… (2700-2900W)
i still have to check if there might be any shorts in my motor cables, which i think is very unlikely…
and regarding cut-offs, i am thinking about starting the VESC cut-off at 3v per cell, and ending it at something like 2.6-2.7v and the BMS cut-off at 2.5v. ludwig_bre recommends 3v startand 2.5v end.
What makes you think it is the prop?
I still have that one and it gets me on foil at about 1.9kw with 1000cm² foil at 83kg. It’s really an OK prop, just not as good when piercing the water as 3blade props.
Cutting power under load is a no-no and probably one of the easier ways to fry a mosfet.
Oh yes a BMS cut can kill a VESC… but it depends on the quality. I feel like Flipsky controllers can vary enough that one will die while another survives. My first 75100 was killed by a BMS cutout. I am running a Spintend 100a right now that has had BMS cutout many times without issue. It really just depends on your ESC.
good to know, I thought that the capacitors would protect the mosfets…
I have a built in BMS because i want to charge with a dumb charger and at the same time i thought to use it for discharge as well, i might use a fuse for discharge in future batteries…
i mean for what it costs it is definitely a good prop, and it definitely works, but for my conditions the efficiency is close to 20% a good prop should be somewhere between 60 and 70%
for your conditions seems to work a bit better, what do you ride a barracuda? and what speeds do you ride on 20-25 km/h?
I am not sure how you would measure those numbers or even what they represent.
Which actual prop are you taking as a reference?
I am using this as foil assist.
When I went from the Flipsky prop to FD 3 blade, the range I got out of a set of batteries stayed about the same, as did the max power required to get on foil.
The FD is just much more user-friendly when piercing the water, which makes it easier to ride.
