Thanks both for your comments!
Following the initial feedback, I’ve decided not to use the kitefoil board and get a dedicated (inflatable?) board like a Gong Hipe in around 110L. I would still use the IC6 foil…
BUT… plans might be compromised now that I’ve found a crazy good deal on some brand new batteries from Takuma (<200€). I believe they are made of Samsung cells.
25ah definitively better but even that’s a little small. Many of us use the LG Robot packs that are 10S 36V 55A/H so total 2.2 KW/H of energy I get between 1 and 1.5 HR with a larger wing than you. You will have about 1 KW/H so half the power but with a much smaller wing you need more power so probably less than 30 minutes at best.
Thanks Windigo for this valuable feedback. I guess to save time, I’ll first try with those 25Ah Takuma for cheap (180€) and if I feel like the range is way too small, I’ll build my own pack based on 21700 Molicel P42/P45.
Following everyone’s advice, I’m now looking for a different front wing, around 1300-1600cm².
I’ve prepared a shopping list
Vesc: Flipsky 75200 Pro V2
Batt : Takuma 25Ah 12S10p
Motor : FlipSky 70165 120Kv
Remote : Flipsky VX3 Pro
Case : Pelicase 1520 / 1550
Prop : That’s the part I’m unsure about… Fliteboard, Flying Rodeo, Pwr Foil, FlipSky…??
Another option to look at is PropellerKing, EU based and made by forum member superlefax.
I think Flying rodeo is always a great option, and they are made of aluminium.
The Flipsky props are cheap, but not really sure I’ve seen much reported about them (good or bad)
The Fliteboard prop is also inexpensive and works well (I have one that I use). It has an 11mm hole for the prop shaft and needs to be drilled out to 12mm. Easy with a drill press, or can be done with this printed drill guide: Flite Prop Drill Guide by Caleb | Download free STL model | Printables.com (I used this and it worked fine)
I tried different props over the years, FR 3 Blade 6” pitch, FR 2 blade 7” pitch, 2 blade from Volker and Flite. They are all good props, my favorite one is the Flite, runs smooth (3 blades) with good thrust for takeoff and high max speed (pitch is unknown but my guess is around 7.5”). Efficiency is also very good.
I use it on a 63100 outrunner with KV 140 as well as on a FR (lift) motor. The 63100 has less torque than a 65161, the FR has more. 70165 should have more torque than a 65161, so it should run fine.
Yo, not gonna lie, your current setup might be kinda sus. The board’s so small you’d have to lie down on it just to get gliding before you stand up, plus that battery box is totally in the way. I’d 100% go for a cheap inflatable board like I did (mine was $290 + $60 shipping). It’s super light, doesn’t mess with your turns, and is mad easy to lug around. Check out my threads for the deets: Components guide for DIY eFoil and Russian͏. Trust me, you’ll thank me later!
Quick update…
I ended up purchasing an F-one Phantom 1480 foil.
ESC & remote have arrived, as well as a JK BMS (B1A24S15P - 150A/300A peak).
I have also sourced the motor to box connectors (Amphenol Surlok) and some XT150 for the battery to ESC.
Next step is to source the 21700… Agree with you Sat_be that 50S are not the best for high current, but since I’m going 10P, they shouldn’t see anything higher than 15Amps max no?
50S being higher capacity and cheaper ($2.7) than molicel P45B ($3.8)…
I managed to spend 1H30 (1 Full batt + 1/2) on a Flite this afternoon and I loved the feeling !! I was quite surprised to be able to stand and move around within the first 40 min
And oh man these are fast! I didn’t dare pushing it above 30km/h
Can’t wait to finish my own, but now I have even more interrogations on my choices of sizes…
So… Battery assembly is probably starting next week. Went for 13S10P of P45B. Watertight box is ordered.
Still need get a charger, was thinking about something around 20A…? What are you guys using? (Planning on charging through the BMS… )
As for the board, I managed the Flite (rigid board) with 100L earlier, what size should finally I get ? Smaller, bigger? '(Will be an inflatable, and I’m 100kg.)
I’m currently considering somewhere between 95-105L or maybe 110
A new 75200 has been ordered, and I now need to find a “better” way of doing things. I do not know where it failed; either the seal of the aluminium box or the sealing (Sika 521UV) between the battery box and the Vesc box.
The dedicated aluminium box was perfect, never saw the Vesc above 42°C.
I’m about to order a bigger plastic case to fit the Vesc with the battery but I’m worried about cooling. I’m a bit reluctant to have an opening in the box for a cooler…
Overall the external aluminum box seems like a good approach.
You could always try drilling another hole in the aluminum box to add a schrader valve or something similar. Then seal it all back up and pressurize a bit with a bike pump. See if it holds air pressure and that would mean it’s sealed. If pressure is not held you can submerge in the bath and search for bubbles
I charge and discharge my 2 batteries through a JBD 240A BMS they are 10S11P 55AH after 1.5 years no issues with the BMS the cells are always super balanced like 0.01v apart
While trying to come up with a new plan, I came across these DEUTSCH DTHD04-1-4P / DTHD06-1-4S connectors.
They are supposedly IP67 and 100Amps, and seem to be meant for use in harsh environments (including under the hood)… Has anyone given them a try to connect the Motor to VESC?
V2 is now up and running for a few sessions…
I relocated the Vesc in the battery box. It is now attached to a 6mm aluminum plate acting as an heat-sink.
Phase cables are now integrated into the mast and I removed the prop guard. This makes a huge difference as I can now foil as low as 1500W / 30 Amps.
However I feel like my design is far from being optimal as I get fairly high temps from the ESC (up to 75°C). Is this acceptable or I should think about another design?
