[Lil' Lavery]

Originally Posted by Ianworld

Dr. Joe I recently heard that planetary gearboxes were much more efficient than that(on the order of 98%) but I'd hate to argue with you and what I heard could very well have just been hearsay. Do you have a good website or other source you could direct me to that explains the efficiencies of planetary gearboxes?

Think about it logically. A spur gear is typically about 95% efficient. A planetary gearbox contains multiple spur gears, therefore, it should be less efficient than a spur gear.