Hi, this is a great work.You put the GPS in the efoil-board, will your GPS signal be broken?
Of course, I’ve not tested anything but yes, if the board and box gets submerged the signal will disappear but hopefully my build will not turn into a submarine :-). You will probably have kind of the same problem if the GPS is inside the remote, if (or in my case when) you fall into the water.
My plan is to put the antenna (both GPS and remote receiver antenna) as high up in the box as possible towards the lid. I’m not sure at all if it works and it has to be tested
how are you getting on with this design? any progress?
Thanx for asking @Beninspain . It’s going quite well, but as always, everything takes time and something called life always seams to come in between 
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I’m almost done with the box. Mast, motor and cooling water are connected to the box. Battery has arrived. The board electronics is communicating to the VESC, BMS, GPS, MPU and to the remote via bluetooth. Also, my DIY remote is almost finished, communicating to my electronics OR directly to the VESC via bluetooth. And yes, the remote is waterproof. It has been lying in the bath tub for 24 hours without any issues
I’m planing to post a larger update of my progress in a week or two.
I don’t have any new images to show but here is one that is a couple of weeks old
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that box is looking great. i have the same inflatable just shorter coming. i may have to use your ideas for the box design.
I will share all my designs in my upcoming post
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Looking forward to the v2 design as I’ve got an extra inflatable so I need an inner core for it!
It’s coming
First time in the water for the YAHEF. My neighbor was kind to lend me his pool this afternoon. FR prop, FS65161 motor, 30 kg of thrust at 41 amps from the battery and 85 amps on the motor, around 3500 rpm with full throttle . Water temp 29C and max 52C on FSESC. I think it’s possible to squeeze out some more if I change from duty cycle to amps or RPM. Need to do some coding, making it possible to change this on the remote. Also I’ don’t remember the limits I set on the FSESC.
Will have another try in a couple of days and see if I can squeeze out some more.
Comments on the numbers? Is this what to expect?
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Great numbers, It would be better if you could reach 60A though, with 35/37kg of thrust. But this should be enought. What is your wing size ?
How can that be at full throttle. I am not the electronics specialist, but from explanation of a friend who is producing esc, it should be nearly equal.
The front wing is a cheep Chinese with a 63.5 cm wingspan.
Had a look at my VESC setting yesterday and apparently I was a coward. Max amps to the motor was 90 amps. That explains why I didn’t get any higher
I’m not an ESC expert either but looking at others data, the motor current is about the double of the battery current.
I think I have read an explanation here on the forum but I can’t find it again. Anyone?
Soon I will get my metr (hopefully) and can also support with numbers. I have similar setup, 100kv FS65161 with FR prop and 200a Flipsky esc. Batt is 12s
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Yes that seems normal as you test static so torque is getting more and more and phase advance as well. So effeciency drops. when your riding your motor amps will not be double the batt amps. Only if you setup is really bad 
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If you used a Ampere Clamp, the battery Amps should be measured with DC and the Motor current with AC?
I believe the quote you are looking for explained how the motor watts and battery watts will always be equal. The speed of the motor is controlled by lowering the volts. Amps x volts = watts so when the volts are low the amps will be high to equal the same watts. Full throttle is full volts so the battery volts and motor volts are the same and therefore the amps are the same too.
Something in your settings is preventing full throttle and therefore the motor amps don’t match the battery amps.
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