Gentlemen,
A couple of years ago I fabricated an electric go kart from scratch for my daughter using electric scooter technology. http://www.youtube.com/watch?v=89QZF559pbE It worked quite well. Top speed was 13mph using a 500W motor, 11 tooth primary drive sprocket and an 80 tooth wheel sprocket.
I am now working on plans for an electric bike using the same technology. Here is my plan. Please tell me if you think it will work.
Motor = 500W, 2500 RPM, Scooter controller and sla batteries. Single speed bike with coaster brake. Motor has 11 tooth sprocket. It will be mounted to with the sprocket on the right driving a 5/8" jackshaft with a 25 tooth sprocket on the right. On the other end of the jackshaft (left side) will be a left handed freewheel with an 18 tooth sprocket. It will drive a chain to a traditional 44 tooth or 36 tooth left side drive / spoke mounted (rag mount?) sprocket. The freewheel should allow the bike to coast when the motor is off or the bike it being pedaled.
According to the Gear Ration Calculator (cool program, thank you Jim Sitton) it should be good for 30 mph or better.
Does anyone see any probelm with my idea so far? It's kind of a take off on the Nuvinci approach to the drive set up.
I'm a decent welder and a so-so lathe operator so fabrication should not be a problem.
I have or know where I can get all of the scooter hardware and 5/8" jackshaft and bearings. From what I can tell it looks like I need be buy the left handed freewheel and 5/8" adapter from Staton-Inc. plus a rag sprocket mounting kit.
Am I missing anything here?
Spud
A couple of years ago I fabricated an electric go kart from scratch for my daughter using electric scooter technology. http://www.youtube.com/watch?v=89QZF559pbE It worked quite well. Top speed was 13mph using a 500W motor, 11 tooth primary drive sprocket and an 80 tooth wheel sprocket.
I am now working on plans for an electric bike using the same technology. Here is my plan. Please tell me if you think it will work.
Motor = 500W, 2500 RPM, Scooter controller and sla batteries. Single speed bike with coaster brake. Motor has 11 tooth sprocket. It will be mounted to with the sprocket on the right driving a 5/8" jackshaft with a 25 tooth sprocket on the right. On the other end of the jackshaft (left side) will be a left handed freewheel with an 18 tooth sprocket. It will drive a chain to a traditional 44 tooth or 36 tooth left side drive / spoke mounted (rag mount?) sprocket. The freewheel should allow the bike to coast when the motor is off or the bike it being pedaled.
According to the Gear Ration Calculator (cool program, thank you Jim Sitton) it should be good for 30 mph or better.
Does anyone see any probelm with my idea so far? It's kind of a take off on the Nuvinci approach to the drive set up.
I'm a decent welder and a so-so lathe operator so fabrication should not be a problem.
I have or know where I can get all of the scooter hardware and 5/8" jackshaft and bearings. From what I can tell it looks like I need be buy the left handed freewheel and 5/8" adapter from Staton-Inc. plus a rag sprocket mounting kit.
Am I missing anything here?
Spud