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Messages - thepauly

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1
Home Brew / Re: Electric Vehicle Design
« on: June 08, 2015, 12:49:40 AM »
Anybody else have trouble with the spreadsheet? I downloaded it, and it's all values, no equations.

<edit> I used Excel to open the document, and apparently equations don't carry over when you do that. I've saved it in Excel format, so others using proprietary software can use it, too. All credit goes to Megawatt.

2
Home Brew / Re: Two wheel drive
« on: June 08, 2015, 12:45:34 AM »
When I mentioned reducing unsprung weight, I was referring to the idea of using two smaller motors, front and rear, vs using one big hub motor in the rear alone, to get the same power (rear 5kw and front 5 kw, versus a single 10kw in the rear [numbers used for reference only, this is not a design specification]). Obviously, adding hub motors to the wheels increases unsprung weight.

3
Home Brew / Re: Two wheel drive
« on: June 07, 2015, 08:31:21 AM »
Thanks for the replies. I had seen the DARPA bike before, but I'm thinking it's driven by the Christini system, which is definitely beyond scope and budget for me.

I should have been more clear with my original post. Has anyone built a conversion with two hub motors?

The brake issue is valid, but the bike has drum brakes now, so I don't imagine a single disk brake would be a step down.

4
Home Brew / Two wheel drive
« on: June 07, 2015, 12:33:08 AM »
Hi everyone. I've wondered if anyone has thought about a two-wheel drive ev, using hub motors. From my completely noob perspective, it seems like a decent idea. You would get regenerative braking from the front, where most of the braking power comes from, you could use two small motors, instead of one, which would reduce the unsprung weight in the back. It seems like packaging would be easier.

OTOH, would it need two controllers? Is a single hub motor all that heavy (compared to a drum brake, which my bike has)? Is regenerative braking even worth the complexity?

I'm considering an ev conversion for a 1971 yamaha, so I'm spitballing here. If it's stupid idea, I won't take offense. I just haven't seen any and I know I'm not the first to think of it.

5
General Discussion / Seattle-area rider, considering a homebuilt
« on: June 06, 2015, 12:02:22 AM »
Hi everyone. I'm a dirt and dualsport rider, I have a '71 Yamaha CS3B with a blown engine that I'm thinking of converting to electric. Right now I'm at the point of initial research and feasibility study. In order to meet my needs, I would need to get 60+ mph and a 60 mile range for the project to make sense. I know OEM electric motorcycles are capable of this, but it seems like homebuilt bikes don't commonly meet the same benchmarks. I'm curious about how much it would cost to attain those kind of numbers.

As with anything, I'm sure this project falls within the good-fast-cheap triangle. I have good fab skills and modest electronics skills. 

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