Hi all, first post on the forum but I’ve been lurking and reading around for a while now. I’m a First-year Product Design student at Falmouth University, looking to build a compact E-board for commuting and general everyday use, and have a few questions before I start out. To clarify, before anyone asks, I am not new to brushless power systems (6 years building multirotor aircraft), nor am I new to building skateboards (10+ years making my own decks and selling custom setups). I am, however, inexperienced in combining the two.
The design is for a 24" “penny” style deck, running four small motors similar to the kind we use on small scale multirotors, rather than one or two larger ones. The hope is that this will allow for an overall lighter build for the same power output, while also reducing torque steer and improving grip. Are there any glaring issues with this layout? haven’t seen many 4wd boards around and I’m not really sure why, am I missing something?
I’m looking at using four 28-14 500kv motors on 4s, with two 4000mAh lipo packs in parallel. Based on my research so far it looks like (??) this should be a decent setup, and should achieve about 2.1KW at the wheels(525W/motor) which is of course overkill for a small board so I’d need some sort of soft-start on the escs. Mainly just want that much power for climbing hills since both here (penryn, cornwall) and at home (san francisco) I live in very hilly areas.
As for ESCS, I’m not sure where to start. I originally considered going with R/C car escs, for the high peak current rating and (albeit non-regenerative) braking, but I’m now thinking I should look for something more application specific. Any advice on this? Somewhat lost as to where to start on this front.
Planning to use Darkwolf’s GT2B mod for control.
Below is a render from my conceptual cad model of the board, just to give an idea of what I’m going for here. (belts and wiring aren’t pictured because they slow down the render about 100-fold.)