What one way bearing? :P it failed under the first big hit in testing so I binned it... In a robot like ls4 etc I guess you can get away with a smaller one... As they turn the throttle off before hitting someone... And they have like a 7:1 ratio so there's not much force getting to it in there application... For a drum with a high ratio it's not worth doing unless you plan to turn of your motor before a hit...One way bearings carnt take much radial load compared to a normal bearing of the same size.

It works like this;

On the output of the motor shaft you put the bearing.. Then you'd need to bore your drive pulley out and put the one way bearing inside that... Or something to that effect...

So basically if you turn the motor... The bearing locks in one direction... So it's like the pulley is just attached directly to the shaft... But if you turn the pulley on the motor shaft with the bearing in it, in the same direction, it can rotate freely...this means the drum can free wheel without spinning the motor.

The bearing has to be locked via a keyway or press fit onto the motor shaft and the inside of the pulley.

I came up with the concept when I had to develop a starter motor setup for a shell Eco marathon car ... So the starter motor could start the engine then disengage once the engine kicked in.... Can take a minuite to get your head around the mechanics of it, it's a pretty simple concept.

I got it of the Internet somewhere, not sure where but I remember it was around £22 a bearing... Not cheap!

Does drumroll take a while to spin down?