New Board build - Help please -

[rodgah]

Hi guys,

I have been part of ES for quiet a while now, but never considered powering a skateboard till a few weeks ago when I watched a local down the beach on an e-go. So the bug bit and here we go.....

I have come to the decision to use mainly Enertion parts as I like to support a fellow aussie and also by the time I pay for shipping and exchange rates I am not that far behind. Did I mention they look purrdy. :lol: . I don't have wild power requirements and where I would ride it is mainly flat, but I am after a fairly low speed of ~30km/h top speed. For this reason I think I would be better to use a bigger low kv motor and taller gearing on a single motor for reliability and simplicity sake. This pretty much rules out the enertion branded motor and the 50mm sk3 motors.

So my question is do people use the 63mm sk3 motors like the 6374 192kv or is this too much of a motor for a skateboard? My experience with belts has been that the more teeth you have engaged the more reliable the drive is, hence the lower kv. With this motor (if my math is correct) and a gear ratio of 15 -> 36 on 6s I should be right on my target.

192kV x 25V = 4800 / 2.4 = 2000 x (pi x 83mm) = 0.5215km x 60min = 31km/h

Is there anything else I'm missing?

Ill be planning to use vedders esc if I haven't missed the boat on an order and make my own deck with integrated battery.

Cheers,
Rodger

 

[bandaro]

G'day Rodgah, good to see you branching out in your builds

I hear the enertion stuff is premium, and he is all set up in rAdelaide now so should be sweet there. Gearing sounds about right, have you ever ridden a board before? The motor will work, being rated the 12s you will be in more reasonable power limits with your 6s setup, but they are a heavy motor so might be best to go smaller, unless you have hills/big guy/want torque. Essentially they are exactly the same as an rc bb drive electronically, and a much simpler mechanics so you should be all over it. With the 15mm belts there won't be an issue, but if you are worried you can get some bigger wheels and bump up the pulley size. Torqueboards was a sweet tute written up regarding component choice and reasonings, should be on the first page somewhere/in his sig.

Could be an idea to use a lunchbox and velcro for starters, get it sorted out before making the deck, but I'm interested to see what you come up with!

 

[rodgah]

Thanks for chiming in bandaro

I can surf and skate, the lowish speed requirement is just so that if or when I have to climb a hill I know I can. And it will be ridden mainly around people walking and on footpaths so its safer if I don't attempt going faster :lol: . Anyone that rides it will be under 90kgs. I am just asking if I am going for an unnecessarily large motor for no reason. Enertion stuff is 9mm wide belts, so I suspect the dual drives were to negate the limitations of the belts....hence why I want to use the tallest gearing possible, in fact if there were taller primary gears I could go an even lower kv motor.

I have read the sticky and the other more recent guide, and I have looked at a lot of builds but from what I see not many use the longer 63mm motors.....only the mountain board guys.....so I wonder why?

As for the initial board it may be as simple as a piece of ply and lots of duct tape :lol:

 

[torqueboards]

Usually for weight is the reason why most don't use the 6374 motors. You also wouldn't be able to mount the 6374 on a dual rear. It would have to be mounted dual diagonally. Sometimes, you can add washers/spacers to the truck to push the wheels outward more.

50mm motors are usually the standard and work great. Although, 63mm IMO are definitely better they are just heavier.

Vedder's build is a 6374 SK3 at 168KV with 12s voltage.

I've been testing out 5065 200KV motors which I just bought and they work great for torque. The downside is I have to increase my voltage to add more speed.