Are you aware of this option for downwind?
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Yes, I am following the tests on french forums.
But I feel like e-foil will give more possibility, with a small board.
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Right about the weight. May have to consider the maytech for this build as I have it available.
Here is the box for future reference.
Very happy with the first print of the pod in petg-cf. I will need to find a way to hold the door without a screw to make it really tool-less.
The inside part is being printed in tpu now, I print it super slow but the results are strong as hell.
Update : Weight of tha maytech without pod
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It might save weight, but the performance is terrible. Mine stutters and goes all over the place over 70% throttle.
My Flipsky 6374 is smooth as butter at all throttle values.
Wich prop? I heard the maytech with a tree blades is quite ok. Mine was always troublesome with the two blade, the main issue before I stopped using it was cavitation more than the lack of power.
Actually I have to weigh it again without the tpu mount to have a more fair comparison.
So, the Flipsky waterproof motor that you use is 6374 140kv?
Do you think this 6374 is sufficient for assist needs, let’s say a demanding scenario with a 90kg person, a small board, and choppy conditions?"
And with 12s?
+1 on choppy. There is a zone where bumps are not enough to help start and too much to have a clean run-up to get on foil
Yes easily. I am 99kg currently and deep water start the Flipsky 6374 140kv.
With what kind of foil?
Look at his other posts linked here:
'Flipsky's new waterproof 6384 - #63 by lishine
(I just transferred the discussion to the relevant topic)
It is an extreme configuration of Veloce XL with 24L board while weighing 95kg
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the print of the inner pod part finished OK, but with some underextrusion. Still feels adequately strong.
I have been thinking about a under foil setup a la foil drive V2, as my box placement on the takoon board was still a little probelematic.
Found some waterproof XT90 for that purpose, thinking about printed shell and fully epoxy casted controller and battery. That would split the cost of a failure between the pack and the controller, the 84100HP is only 80€. If I manage to get a good enough signal in BT, then I do not need a extra maytech receiver.
So the idea would be to have a cast shape with the 84100HP, XT90 in and MR60 out, ideally using the built in BT for remote.
The battery would have just a XT 90 and be potted, using some sort of balance board or BMS cast into the resin.
FYI I and a few others build flat box on top of the board .
1 - it will not add drag like fdgen2
2 - can be adjusted to be above the wing, above the center of lift
3 - still not modifying the board
Interesting. For me another important factor would be signal reliability. Moving my box from the back of the board to the front solved 99% of my issues in v1.
Having the receiver under the board, with a CF board, is probably a receipe for problems.
With the box under, you have a much cleaner Cable routing.
I will draw something to get a cleaner Idea of options.
I ordered a 1201 front wing should be a great addition to the 1300 for downwind and surf foil in small swell.
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here is the idea, the bolt would secure the battery. 12S2P with P45B or P50B, waterproof XT90. MR60 for the phases.
I will think about ways to reduce the cast volume.
50mm thick by 500mm long, 120 wide.
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Do you think 200 gram will affect riding in a way that you will feel? A sip of water before you go out (or the horror : changing into a wetsuit 
) would be equal/more.
OK, it’s three batteries but still?
Well, Saving kg starts with Saving 100’s of grams. I am undecided for now.
Getting ready for test for the New POD today, with the 1300 and the 4.2’
Also redesigned the 3 blade hub to have the correct angle for fully folded blades.
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Nice, weight adds up but the maytech motor has been reported as being poor quality and too weak. Hope it works for you.
Today was a Real World test of dw with the assist. 30+kt winds against river current, nice short bumps 0.4-0.5 meters. Good feeling on the png1300.
Result, popped a mosfet on the already repaired 60100hp and finished the session by rock start DW 
Box on deck
Pros:
You Can get signal underwater by having the remote in contact.
Signal IS very good overall
You get visual if any water Comes in
Cons:
Feet placement, I could barely pump the board
Can not paddle the board, box in the way.
Weight not centered (Can be fixed by having the box between both feets as suggested)
Power was barely enough to get started when not being carefull due to the very choppy water. With right timing with a bump, it was very easy.
The différence between the bare board and the assist equiped board was huuuge. Weight centering is probably a good chunk of that.
Second thing I re-learned is an assist could get you in a Bad situation if it fails far from shore, on a small board.
I had a life jacket just in case, but not being able to paddle is a Big risk.
Video :
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Making progress, with another concept, using a 80x40mm tube, and two cast parts that would slide in from each side. It only fits 12S2P 18650.
With this setup, the tube is only 2mm thick, so the cast part has to hold some constraints.
So maybe needs a extra part to hold the force, such as this that could be CNC or printed and glued to the tube :
Such a setup could really fulfill the “light” goal, for a assist only type of build, not really designed for efoil.
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A few layers of carbon would do the trick, that’s what i would try first, minimal weight and a real simple lamination job.
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