They are from China: US $4.78 15％ Off | High purity 21700 Pure Nickel Strip 2P 0.15/0.2*27.5mm for battery spot welding ,21700 Li battery nickel tape spot welder
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US $4.63 27％ Off | 10pcs/lot 21700 Battery Holder Bracket ABS Plastic 20 Cells 10S2P Battery Spacer Expandable Battery Holder Turmera 2021 new
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That construction also shown in post 111 pictures…
Scott
Thank you for the link. I was hoping not to have to order from China…always takes so long.
Thinking about making a foil drive assist. Have made e E-skateboard and wingboard.
It this the motor you used @nekitesurfing?
Does it need any additional weaterproofing? And what cables are you using.
I’m 85 kg and considering a 8s instead of 6s to get enough power. What do you think?
Thanks a lot.
I buit mine with 6s4p and now rewiring the batt to get 12s2p.
Since it has the same number of cells as a 8s3p, perhaps it’s a better config. After all with 10s2p it’s possible to start with a skimboard, so plenty of power! You also get lower resistance losses.
And the difference in total price is just the 50eur extra for the hv esc.
Any outrunner (80100, 63100, 6384, …) always needs waterproofing:
Hello,
That is the motor although I went for a sensor less version.
I am using tinned 3 core cable (2.5mm per wire, around 13 awg) at the moment. This was just something I had. The esc has 10 awg but the motor is only 16 awg. The problem with thicker cabling is hiding it all in a streamlined way behind the mast.
I have one motor potted with resin and using ceramic bearings. I also have another motor that I am experimenting with that I dip in acf-50 (similar to corrosion x) frequently. I wanted to see how long it would last and it is too early days to say but it looks as new after 5 sessions.
I cannot get up on the foil with my current set up in flat water at 90kg. I will shortly be bypassing the BMS on discharge to see if that will give me some extra amps. I also have a 7s4p being made. I cannot fit an 8s4p in my current box.
Thanks,
James
I have 6s with the 170kv version and for me it has plenty of power (70kg). Perhaps 120kv with 6s is simply not enough
My extra 20kg my also have something to do with it 
Thanks for reply.
I’will do some reading about waterproofing the motor. The description sad “waterproof” on the website, but I thought it was too good to be true. I have some silicone conformal coating that I used waterproofing drone electronics. Haver anyone tried that instead of resin?
I m also 85 kgs with 93 L board and 1600 cm2 front wing …I m running a 6484 on 8s4p plenty of power and running time …
Using my gear to get up on foil and (most of the time) to stay on foil
Nice vid, filmed a bit high but we can clearly see the swirl behind the board stopping which is the FDrive purpose.
This is clearly a marginal / low wind session, I would say sub 11 knots as we can’t see any whitecap.
My weight is 80kg, my frontfoil is a Gong Allvator 2200 cm2, my pumping technique is not good, but pretty solid (maybe 6 of 10 points)
I’m not familiar with knots in this low wind area, so I’m not able to anwer you precisely. But I guess I’m able to e-wing under 10 knots (forecast was 6-8 knots). On this (and a couple of other days with same condition) I would have no chance to get on foil, I even wouldn’t hold up hight.
I have been running my 120kv motor with the magnets filled and dipped in corrosion x every 6 runs for 9 months now, probably over 100 hours of saltwater use with only light corrosion showing on the outer bell housing. I change the bearings out with the same cheap stainless ones every 20 hours or so.
Been using a 6s2p battery with plenty of power at 82kgs. Even enough to flat water foil for 10-15 minutes. I tried a 6s1p and I could get up with a wave but it lacked power so I stuck with the 2p configuration.
Interesting to see the 6s2p performs well. Is this with P42a batteries?
Yes, using the Molicel P42a cells
This is what the inside of the motor looks like after 100 hours of saltwater use with no water proofing except for corrosion x on occasion.
Could you also take pictures of the magnets?
I just put it back together and mounted/taped to my mast, but next time I pull it apart I will upload pictures of the magnets.
