Home Built Electric Bike

I built this bike for my wife, to test wheather it's possible to drive a bike with an electric model aircraft motor. I found out it's possible, but not the best or easiest way to make an electric bike. Some data: Brushless outrunner motor developing 4kW at 10000rpm (I only use 5000rpm), Top speed 30km/h, Action range about 20km, Batteries 24V-18Ah, Gear ratio 1:20. Probably not legal to drive on public roads in Sweden, but quite fun all the same :)

Category:

Autos & Vehicles

Tags:

• home
• built
• electric
• bike
• brushless
• rc
• model
• aircraft
• motor
• sweden

[gabel13]

I have the same idea, and plan on building this year. It looks like you used the Turnigy 80-100. If that is true, Why did you de-rate the motor to half? You might as well have used a smaller, cheaper motor. You could have saved $150US.

Also, If you mount the motor transverse, you gain the opportunity to use multiple motors, thereby beyond 30kW with very little redesign time. Those right-angle gearboxes are expensive and weigh more than an additional motor.

Good work anyhow.

[matszh]

@gabel13 A smaller motor or less gearing wouldn't produce enough torque to start the bike, se earlier comments. If you strive for low cost and high efficiency a hub motor is the best soulution. However, this was more of a technical challenge.

[hansolduron]

Very interesting. I am planning to convert my bike to an Ebike. I might consider using a 6000W motor (just for saving me from using a gear box, not for the maximum speed). I really like to read about the laws of driving bikes in Sweden. Can you help me by directing me to them on the net, please ?

And is yours loud enough to attract people's attention of a weird thing passing by ?

[matszh]

I should say you'll need some kind of gearing anyway. Please Google: E-cumbent , a very ambitious project by Matt Shumaker, that ended up with a 6kW Plettenberg RC helicopter motor. You have to ask yourself if you want a good and easy built e-bike with a hub-motor, or if you want a technical challenge by using something else.

[matszh]

Concerning Swedish laws the e-bike motor must stop if you stop pedaling the bike, also the effect and speed is limited to 250W and 25 kilometers per hour. In fact it's meaningless to try building a legal one. My bike is not very loud, but you can hear the motor running.

[Dtate91]

Hear that?.. Sounds like a shit bike ;)

[Chuechco93]

well done

[metro2002]

Nicely done, pretty neat setup

[mrfourtysevenman]

you coulda put a prop on the back and make the motor push you. wouldnt that turn heads?

[matszh]

About 50 km/h when using the 7 gears

[vishunest]

excellent work...it's even got gauges!

[sjtf2]

excellent work you should think about making kits and selling them

[psychotikpaisano]

4000W of course its going to get a bike going!