1 - 3 of 3 Posts

#### le blond

·
##### Registered
Joined
·
4 Posts
Discussion Starter · ·
hi everybody!

for my e-bike project i wanna put this motor http://secure.oatleyelectronics.com...d=192&osCsid=05595849759ae525e3a47affcd28e1fd on a 26" wheel with a 7 speed gear (biggest 28 tooth - smallest 14 tooth) the motor is running at 320 rpm an have a torque of 7.46 Nm, my question is: is the motor will have enough torque to propel the bicycle with me on it (140lbs) i'm good only in basic mechanics sciences when it's get more complicated i bust!

p.s: excuse me if my english is not perfect i'm french!

thanks!!

#### xrotaryguy

·
##### Registered
Joined
·
929 Posts
Your English is very good. Better than my French!

Since the motor is actually bigger than the legal limit, I would assume that it is capable of moving you quite well. The questions that need answered are "How quickly will it accelerate?" and "How fast will it go?"

To calculate top speed you will need to know the bicycle's aerodynamic drag coefficient. Actually this calculation really needs calculus to be very accurate. The acceleration calculation should be done with calculus as well because the motor will not always produce the same torque, and because drag will increase with speed, but we are probably close enough.

#### le blond

·
##### Registered
Joined
·
4 Posts
Discussion Starter · ·
wow!