Hello,
Context
I’m Boubak, a software R&D engineer from France :).
From the very beginning I wanted to build something that make me sh*t in my pants and commute because as somebody working in Paris, I hate the subway and I really prefer to be outside, exploring the city everyday.
My first attempt was a build based on a loaded tan-tien longboard with paris trucks, i-don-t-know-the-brand-anymore belt motor mounts, APS sensored 220kv 50-ish mm 2200w motors (don’t remember to be honest), 2 4.7 vesc and 8S li-po battery pack.
It was great, really!
But I started to neglected it since I realized that it was inconvenient:
- Flexible board with battery pack under, so I never found a satisfactory option to mount other than the temporary rope+plywood+plastic-collars
- Not waterproof at all
- Not offroad enabled
- Need to get off the board to get on sidewalks
- Hardware vulnerable under the deck
- Could be more powerful
So I couldn’t really use it daily, and no offroad at all (I was raised a snowboarder, I want to do offroad, I need it…).
My goals with this project
So, I wanted to ride something more bullet-proof, rain-proof, offroad-proof, with the hardware uperside, more powerful and that can get on sidewalks.
So, after reading a lot of post on this forum (especially from @NoWind and other no-limit E-MTB builders ), and after spending many months viewing @Nowind youtube channel (and dreaming I was him riding his machines ), I decided that it would be an E-MTB ! \o/
My BOM, so far…
Considering I’m 175cm, weight ~75kg and carry a 13kg backpack
Board : Trampa HolyPro 35 16 ply with infinity or vertigo trucks, superstar hubs and trampa threads or primo alpha
Motors : APS C8085 sensorless 170kv with AS5047 magnetic encoders
ESC : Dual V6 esc from Trampa or Flipsky, best if with integrated anti-spark switch
Battery pack : 12S Li-po setup (4 x Compact 6200mAh 6s 40c Lipo Pack w/ XT90) with a 200A BMS from Bestech (like the HCX-D575 )
Remote controller and receiver : my hobby remote and receiver
Motor mount : Direct drive (with helical gears?) from @Nowind, if possible with custom motor cages with AS5047 mounting capabilities ( is it possible ? )
Additionnal stuff : Custom aluminium waterproof battery enclosure and custom aluminium heatsinking VESC enclosure CAD-ed by me (I need to train more on freecad) and manufactured by any prototyping company willing to do it. A lot of 8AWG and 10AWG silicon wire. Maybe bluetooth telemetry.
A lot of questions
So here is my plan.
And I’m sure about almost nothing XD.
And I ask me a lot of questions:
- What about risks of frying drv with transients on a VESC with a 12S ?
- Will my custom battery enclosure ( that I would between my foots) prevent the board from flexing ?
- Is it really possible to make it rain-proof ?
- Does 2 C8085 motors fits with motor mounts and cages and AS5047 housing on a standard Trampa Infinity truck
- Is is possible to dissipate enough heat by screwing 2 VESC on an aluminium box (with thermal paste) to run them at constant 100A max motor current in BLDC?
- The same in FOC ?
- If it works, will I die in the 2 weeks following the completion ?
What do you think about it ?
Boubak