Universal foil assist / efoil / tow solution (2nd)

I tested recently 80A Xcross (with pelican external radiator) with 12s (on a test bench), which has probably the same number of transistors as 75100. It got to 90c after about 20s. It was 40A battery current and 80A motor current. Also it didn’t allow me to increase current farther.
My conclusion was that these mini esc or vesc are not fit for on the body usage, not worth the try in water. Also this esc managed to work only after I added to it capacitors. So maybe something was wrong with it.

@salomon
Similar to your radiator :smiley:

1 Like

First test in waves was successful. The Overboard bag is IP66 as stated, there where a small drip or two inside the bag after 5 minutes of cruising around (not fully charged battery to keep voltage down). Felt scary to only have plastic bags around the battery (in addition to 3d printed housings) so I plan on adding a fuse to each battery cable in case of XT90 shorting on water ingress. Will look into ways of improving the bags folding seal, it’s really comfortable. Input on risk and mitigations are welcome.

1 Like

I have had no water issues in my new bag until now. Not even one drop. But it looks like there is some steam in the bags of the battery after usage. Propably because of the heating and cooling down afterwards. Until now I had no issues at all, but I am testing in fresh water.
Last time I did a lot of deep water starts on my 14 Liter board and still had no heat issue with the Makerbase VESC 84100 without additional cooling.
One thing I don’t like is that the motor cable does not swim, which is a bad feeling on a smal board (I could touch the propeller…).
Any ideas to make it swim and still look good?

3 Likes

Recycled my last build and upgraded it to bremote v2:


2 Likes

I usually solder my high amp batteries.
See:



I needed a new battery because I build a tow based on 65121. it pulls like a horse

1 Like

what cells are you using and no BMS right?

Until now I used Samsung INR21700-50S, molicel, Tenpower INR21700-40TG. …
Never had any issues after soldering.
You need to use a high watt solder

OK nice thanks! What do you charge with, multi balance charger?

1 Like

If I understand, you have only batteries in your Pelicase.

So which connectors do you use between the case and the ESC+receiver aft dedicated box ? Tks

I use a waterproof xt90

Today’s session with 840 spitfire on a 14 liter board. Also added water cooling:



2 Likes

BTW, I have to mention that the range of the bremote v2 is amazing. I configured rx and tx at 20db and can even start with the tx 20cm below the water. That’s handy for the 14 liter board on the tow…

2 Likes

Cutted my cable at the backpack. Testing spiral cable now:

Too much stuff for a windy day…

What is the cross section of the wire, 11 awg?

It is 2,5mm2. My non spiral wire was 2,5 too

Yes, it is approximately 11 awg. And what is the length of the coiled cable, does it stretch well, does it not heat up and if possible, general impressions of use. Thanks.

2m stretched. Feels good when I stand on the board. Will test on the weekend