Maxime_ecn slow build / TP4070-V1 / Reisenauer 6:1 / 12S li-ion / VESC 100A / Horue Foil


#1

Hi guys,

My name is Maxime, i’m 25, i just graduated from micromechanical engineering in Neuchatel Switzerland. I will be living there soon and guess what : the city is in front of a beautiful 220 km² lake :grin:

I’m equiped with a 3D printer and a 3 axis 6040 CNC. I already built 2 eskate and now i would like to go for the efoil ! The build is going to be slow (i’m always slow because i have tons of projects at the same time) but i will focus on making something with a great design and quality. I will also try to make a good video to show all the building process.

Actually i’m finishing the CAD. Here is the final design :

Part list :

  • Motor : TP Power 4070-V1 7Y 630Kv
    This motor is the most powerful 40mm motor i found (thanks @alexandre)

  • Gearbox: Reisenauer Motor Chief 6/1

  • Propeller: 7 1/4x7 yamaha (from aliexpress) (Maybe the FR propeller later)

  • Batteries: Homemade li-ion 12S9P 23.4Ah (VTC5 cells)

  • ESC: ??? to determine

  • Foil: Horue VINI Pro XLW wings
    Those french made wings are made for a low speed take-off and optimized for good stability at high speeds. I got a 30% deal at blackfriday but still expensive (400€). I really wanted high performance wings (no chinese foil) and i hope this is worth the money !

  • Board: Homemade from an EPS block

The 40mm motor will be integrated in the tube connecting the 2 wings (@Peter’s style) which i believe is THE way to go to lower the drag and save energy. I will try to keep the tube in 1 single piece to optimize weight and rigidity. I have some good ideas to make it waterproof and i hope it will work.

I will first build the board so it can dry a few weeks (or months :joy:) during the propulsion system build. Also for now my budget is really limited so i can’t buy all the electronics/motor/reductor at the same time…

To finish i would like to thank @silvio @Alexandre for their useful help & @cyberfoil for the board CAD.

Thanks for following,
Max.


#2

Thanks for the cred @maxime_ecn :slight_smile: It will be great fun to follow this. Good luck with the build!


#3

Thanks !

I just got the wings this morning. Those are huuuuuge


#4

Hi!
I’m from Neuchâtel too! :slight_smile: Me and 2 other friends from Neuchâtel and Bienne finished our efoil last summer and I efoiled in Serrières until october. I had to disassemble everything to make some reparation so it can be interesting for you. Give me a call: 078 908 91 70


#5

Some news about the build.

I worked on the waterproof enclosures :

As you can see i added a smaller enclosure in the front. This enclosure with be closed thanks to 2 fast button locks :

This will help me to get fast access to the charging ports, no need to take 10 screws out to charge. It will also house 2 voltage testers to check the cells voltage when riding (because i don’t want to use a BMS for discharge).

Here is the first enclosure (made with my CNC) :

Next step is to make the 2nd enclosure and stick everything together with epoxy resin.

And to finish i need an advice : should i renforce everything with fiber before integrating the module in the board ? (like @Mat) or should i integrate it directly in the board and do the fiber work after ?
Thanks !


#6

great idea with your small access hatch… do you think the fast button will be strong to keep the lid tight on the seal?
If you plan on vacuum bagging the fiber on the module (more fiber for the same weight so more rigid). it will be easier to glass it before, a bag for a full board is a pain …

Also, if your CNC can cut epoxy, you could get a much better finish by glassing it, add and extra coat of resin, and machine it back to the exact dimensions you need…


#7

Not sure if the fast buttons will be strong enough but i want to give it a try :slight_smile:

And i didn’t decide yet if i’m going to use vaccum bag or not. Seems like it will be mandatory to get something light and with a nice finish


#8

2nd enclosure done