time to get to work again.
next step tow option:
more files soon at GitHub - robertzach/efoil
epoxy has good heat transfer. using the same for an electric winch for paragliding which has only air cooling and more amps without any issue since >2 years.
It is important to pot it all around.
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some updates:
PETG breaks easy in very cold water:
External Antenna (but not really needed for the boards I have tested yet.)
New case comming soon:
To much stuff:
Warm water testing:
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looks awesome! do you know if the antenna is waterproof or did you pott it in epoxy?
yes, it is potted in epoxy.
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After testing a lot of different assist designs, I ended up in using two plastic bags.
One for the battery, one for a vesc.
I put both in a waterproof backbag and run the motor cable to the board.
This is somehow the lightest and easiest design possible.
I honestly have to say that I like this assist setup the most.
Having no weight on the board feels just great. And I don’t really feel the backbag.
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Do you have a pic of the cable gland into the backpack, and perhaps hints on how to make it reliable and waterproof with some falls and abuse?
For my tests I used a > 15 year old waterproof backbag and just inserted the motor wire through the main opening:
For the future I just bought the following:
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Looks great! I gave it a try today as well, but the temperature climbed pretty fast.
Do you ever run into overheating issues? Or do you mostly just use it to get up on the foil and then keep going by pumping?
Cable glands are useful to prevent water from entering into rigid volumes. Why wouldn’t a modified vacuum bagging valve for molding composite do the same for cables going out of soft containers ?
Variant:
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If anyone knows how Duotone solves cooling with their new hip-bag assist, I’d like to know as well
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I put my tow boogie 12s4p camdenboss into a decathlon 10L backpack to run as an assist, and it fit easily, and with the heatsink had no heat issues and was comfortable, it just lacks a waist strap.
Seeing this bag, I am tempted to try it, as I think it might be more comfortable to remove the box and have a flatter bag. I wonder if a solution could be to follow a similar approach to the box heatsink: to glue and clamp with screws a heat sink to the bag, with a metal plate on the inside. That gives a stable surface to attach ESC, and cable glands through the metal rather than plastic.
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I’m waiting for the OverBoard Pro-Light bag to arrive, it should fit a 2x(6s2p) and the electronics from the camdenboss build
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to glue and clamp with screws a heat sink to the bag
I tested with Butyl tape yesterday and it seems like a perfect choice, often used in boating as a seal around trough-hole mounts.
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Interesting choice:
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I am using a 75100 vesc and have no heat problems. You may try to just add some cooling surface/mass.
Doing cable gland today. Biggest risk be aware of is mechanical forces on the thin fabric, especially over time (falling, cable grabbing something etc) since it has glued seams. I might reinforce seams on the outside. Also adding 50mm 3d printed washers around the cable. Duotone use a carbon fiber box for a good reason here. I think the thicker kayak bag pvc is stronger over time.
