Sorry for the long post, but thought I should get enough. First a little about me…My name is Lachlan, I’m 23, from New Zealand. I have a background in mechatronic engineering and thought it was about time I started a bit of a project…with a mountainboard lying around (absolutely no Idea what make/brand) , I thought I could have a little fun. Where I live, there really aren’t many hills…mostly I’ll be commuting 10km to uni each day, but would also like some room to play around a bit offroad and small inclines (I know, a lot to ask, but thought I should aim high :P). Ideally, I would like a board that could top-out at 45-50km speed…of course I wouldn’t immediately jump to these speeds, but I think in time I would quite like the option (I’ve been long-boarding for years, some downhill, and I think I would be comfortable with these speeds)
I’ve been doing a bit of reading on the forum and also endless-sphere etc, so slowly starting to learn something. So far, this is the build/components that I have come up with:
Pneumatic wheels - 9" (I know, inefficient, but they’re what I’ve got at the moment) Large pulley - HTD timing belt 5mm pitch 16mm wide - 76T aluminium HTD timing pulleys - 5mm pitch 10mm wide (http://www.ebay.com.au/itm/292307247956) Motor mounts - @dickyho long motor mounts for paris trucks. Still in process but I have read good things about these
Parts (potentially) To Get
6x LiPo batteries - 5000mAh 3S 20C, wired into two sets of 9S 5000mAH in parallel…so 9S 10AH battery (https://hobbyking.com/en_us/turnigy-5000mah-3s-20c-lipo-pack-xt-90.html)
2x Turnigy Aerodrive sk3 6364 213kv - (https://hobbyking.com/en_us/turnigy-aerodrive-sk3-6364-213kv-brushless-outrunner-motor.html)
2x motor pulleys - figured I’d get a 5mm HTD pulley somewhere between 12T and 16T for ~5:1 to 6:1~ gearing ratio. I’ve yet to source these but dont think they should be hard to find. I plan on filing the sk3 motor shaft and using a grub screw to fix.
ESC / VESC - I’ve been reading a wee bit about these, and think I’ve just confused myself entirely. I’ll definately have to do some more reading
Queries Firstly I’m a bit unsure as to which esc / vesc I should be investigation. Seems like a go to would be the VESC (what would be a good vendor for NZ based purchase?)…however, I’ve also read that these ones here are also pretty good and also cheaper (https://www.ebay.com/itm/Dual-motors-longboard-skateboard-control-modula-ESC-Substitute-with-remote/323326552273?hash=item4b47c3a8d1:m:mxSlsLM_-dEIr0XuDFII9Lg:rk:3:pf:0). For a 9S-10S dual drive mtb build, what would you recommend? I’m not too worried paying a little more for the motor controllers as I know they are a veeery critical part, but also wouldn’t mind paying less than top end $$.
Secondly, I’ve read that pneumatic wheels are less efficient than longboard. This makes sense to me as they are squishy etc, but I would still like to get as much range out of my board with 10AH as possible. Do you think the current setup I have is somewhat efficient i.e. dual drive 213kv with 9S and gearing of 1:5 to 1:6 on 9" wheels? I was thinking of using 245kv motors to push them into the 8000-9000rpm range as suggested by @onloop in (https://www.electric-skateboard.builders/t/beginners-guide-to-building-your-own-electric-skateboard-drivetrain/53...very helpful by the way), but thought that I should leave some room incase I was to increase my battery voltage in the future (I would love to make my own li-ion pack at some point).
What do you think of my choices? What would you do differently?
Any help whatsoever would be greatly appreciated :)…also, if I’ve posted this somewhere funky, or any of my questions can be easily answered in a different thread, then please dont hesitate to let me know.
Cheers my dudes,