Outback Mountainboard Electrified A123

[kfong]

Here is a start of yet another electrified project. I bought this mountain board a few years back for land sailing. I'm an avid windsurfer and thought this might be a good alternative. I tried it a few times, but lost interest in the idea. It's still in great shape, and it occurred to me that it would be very easy to install a motor. I plan to work on a disk brake next. The motor mounts were done on my CNC machines. I will be using dewalt packs, similar setup as my diamondback ebike.

I'm also thinking of interchanging the platform, a small 3 wheel go kart would be possible. It would be similar to a recumbent kmx without the pedals. Should be a fun project.

[Storm]

Nice work, I would prefer to have the motor on the side of the wheel like a currie scooter, you have done is nice and simple

[kfong]

Thanks, working on a wireless throttle at the moment. Going to use one of the newer R/C 2.4ghz bands that are very good at noise immunity. I did do a test run with one dewalt pack. It moves pretty well at 33volts. I was not able to go full throttle since it was just quickly wired and held together by tape. I was actually nervous on the board, and I lost control of it around a corner. Had to jump off and let the board roll. Throttle was damaged but everything else was fine. This made the wireless throttle setup more of a priority.

[Jay64]

One of my co-workers has been talking about doing a real similar build. Nice work.

[kfong]

Hi Jay64,

I hope he goes through with it. Here are more updates. I added a tray for the batteries and electronics. I need to create some compartments to secure the batteries and electronics before it gets done. A closer look at the motor section.

[patrickza]

I like that, I wouldn't mind one myself. Could you change out the rear wheel with a kids bicycle, do they make bicycles that size with sprockets on them for the drive?

If you can't do a disc brake, how about rim brakes? should be easy enough to set up, I'm not sure they'll work too well though. What are your thoughts?

[kfong]

Disk breaks can be easily added, was planning to do that to the aluminum blank you see on the wheel but will try it with the current breaking system first since I want to be completely wireless to the board. Haven't had much time to work on it, focused on ebikes at the moment. It will have more priority once summer comes around.

[patrickza]

Ok once I get an idea it's pretty hard to get my mind off it. Google listed one for sale on a local classifieds board last year september, but the ad was expired and couldn't be viewed. Google never cached the page, but luckily the number was still visible in the search. Going to take a look at it this weekend.

Can you tell me what size wheels they use, and how did you fit the sprocket? Could I use a scooter rear wheel with sprocket and brake already on it, something like this:
Rear Wheel Assembly For 12-1/2"x3.0" Tires
Rear wheel assembly for 12-1/2x3.0" tires. Made from strong lightweight aluminum alloy. This scooter wheel is complete as pictured and it includes an attached freewheel with 90 tooth sprocket for #25 chain, axle with spacers, axle nuts and washers, bearings, complete band brake assembly with brake rotor and a 12-1/2"x3.0" tire and tube.
Item # WHL-WH9161
Compatible with the following scooters plus others similar makes and models:
Ezip® 500, Schwinn® 2006 500CD, Schwinn® 2007 500CD

[kfong]

I measured 5" between brackets and a 12" diameter wheel. The sprocket is held together with 4 very long bolts drilled into the hub and clamped from both sides. The scooter wheel looks like an easy solution. 12.5" should still fit, but not enough info on the spacing. Is that 3" total? Then it sounds like it would be short, but from the pictures it looks much wider.

Ok once I get an idea it's pretty hard to get my mind off it. Google listed one for sale on a local classifieds board last year september, but the ad was expired and couldn't be viewed. Google never cached the page, but luckily the number was still visible in the search. Going to take a look at it this weekend.

Can you tell me what size wheels they use, and how did you fit the sprocket? Could I use a scooter rear wheel with sprocket and brake already on it, something like this:
Rear Wheel Assembly For 12-1/2"x3.0" Tires
Rear wheel assembly for 12-1/2x3.0" tires. Made from strong lightweight aluminum alloy. This scooter wheel is complete as pictured and it includes an attached freewheel with 90 tooth sprocket for #25 chain, axle with spacers, axle nuts and washers, bearings, complete band brake assembly with brake rotor and a 12-1/2"x3.0" tire and tube.
Item # WHL-WH9161
Compatible with the following scooters plus others similar makes and models:
Ezip® 500, Schwinn® 2006 500CD, Schwinn® 2007 500CD

[sk8norcal]

cool ride !

I had an Outback a long time ago, didn't really like it...
too tall..

here's a gas version..
http://wackyboards.blogspot.com/2009/07 ... rized.html


for more powered boards...

electric boards
http://wackyboards.blogspot.com/search/ ... c%20boards

gas boards
http://wackyboards.blogspot.com/search/ ... s%20boards

[Green Machine]

Cool man...

i had an electrified skate board a few years back and found that if you drill a hole in the front and attach a rope you get a lot more stability at high speed (going over bumps etc).

Just a short rope with a handle protruding from the front to give you something to hang on to...in my case i just used it until i was use to riding the skateboard at high speeds and then got rid of it.

[Blicker]

Cool man...

i had an electrified skate board a few years back and found that if you drill a hole in the front and attach a rope you get a lot more stability at high speed (going over bumps etc).

Just a short rope with a handle protruding from the front to give you something to hang on to...in my case i just used it until i was use to riding the skateboard at high speeds and then got rid of it.

Does the rope you have attached not hamper you while riding? It must have created more troubles. Nope?

[zerogee]

Hi kfong,

I am revisiting the chain drive for my Outback project and I like how you applied it to yours. I wonder if you can answer some questions for me to clear some things up.

You attached the mount and motor below the frame. Did you find that was the best position for chain clearance?

What size chain and sprockets did you use? #25- 11T motor and 72T wheel? Did you find that too fast for this board? What was your center to center distance?

I understand from your brief description how you fit the sprocket to the wheel. However, it's not clear how the sprocket is attached to that plate. I can't see any fasteners going through the sprocket itself. Do you have any photos of the parts of this sprocket assembly prior to assembly and /or how it all goes together? I think the bolts go through those trapezoidal slots around the bearing on the rim? Using the largest bolts that would give you the snuggest fit in the slot? Did you add any more fill (i.e. epoxy) in the slots for a snugger fit? Did you find this assembly solid enough?

Do you have any photos of the finished board?

Thanks,
Myron

[kfong]

I did that so the chain would clear. The sprocket is sandwiched together with 4 very long bolts. Just mechanically held together. I believe I drilled into the plastic wheel rim. It's been a while. It's hanging in storage. If I get to it this spring, I'll take more pictures. You could do it all in Baltic birch as I said earlier. The speed was over 18mph as I recall.