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It pains me a bit to convert a vehicle in perfect working order, but it’s free and exactly the style of e-motorcycle I want for commuting to work. And I’ll help save the planet.
I am a mechanical engineer with tons of experience in electromechanical product design and fair automotive/mechanic skills. I also have a 3D printer at home. It turns out that my exact bike was on HUM3D and I already downloaded the 3D CAD model so I can start to figure out what motor and batteries that I can fit in my chassis.
The problem I’m having is trying to figure out what type of motor to use, what voltage and how many/type of batteries to get. I can’t make heads or tails of the motor performance curves.
My ideal goals:
I’ve looked at a ME1616, but that is a monster and I get much fewer batteries. It looks like my cost goes pretty nuts if I have to go Lithium, but maybe I could charge the bike at work which drops my range to 15 miles.
I’m at a loss and I don’t really want to develop this EV with trial and error. Any advice or guidance would be greatly appreciated.
Thanks,
Derek
I am a mechanical engineer with tons of experience in electromechanical product design and fair automotive/mechanic skills. I also have a 3D printer at home. It turns out that my exact bike was on HUM3D and I already downloaded the 3D CAD model so I can start to figure out what motor and batteries that I can fit in my chassis.
The problem I’m having is trying to figure out what type of motor to use, what voltage and how many/type of batteries to get. I can’t make heads or tails of the motor performance curves.
My ideal goals:
- Get back and forth to work (30 miles round trip) in Florida (flat as a pancake) with city type driving and an average speed of 40-50 mph (if I take the back roads).
- Be able to take the highway route if I choose (75mph for about 9 miles of trip). For this bike 80mph or faster is a bit rough since I have no windshield and the you need the wind to deal with the heat 9 months of the year.
- Be able to accelerate as fast as I can today. Moderately aggressive acceleration if I want, but tires will NEVER squeal on dry pavement. I get 51 ft-lb of torque at 3400 rpm today.
- I’d like to be able to use the existing belt drive on the bike which has a 2.0625 gear ratio. I know this is low for most ev builds. 72 mph requires just over 2000 rpm on motor.
- I do have a radiator and fan on this bike that I can use if I need to water cool the motor.
- Keep the conversion cost below $5k
- Style the bike so it looks like an EV. (I love the look of the 2013 Voxan Wattman motorcycle)
I’ve looked at a ME1616, but that is a monster and I get much fewer batteries. It looks like my cost goes pretty nuts if I have to go Lithium, but maybe I could charge the bike at work which drops my range to 15 miles.
I’m at a loss and I don’t really want to develop this EV with trial and error. Any advice or guidance would be greatly appreciated.
Thanks,
Derek