[jhautz]

OK... I wouldnt send my lipos 60 ft in the air either. That falls in the ''use common sense'' clause.:005: A123 cells are still very viable for you though. Just as durable and safe as the old NiMH cells, but capable of putting out much more current.



As an addition to brians last post:

Generally a motor with more winds will generate more torque with less rpm on the same voltage. Also with the same load (ie. gearing) it will draw less current which translates into a cooler running system and longer run times but lower top speeds.