crazysteamer wrote:And yes, as Georgieporgie says, the one with the reverse thread is very nice - doesn't unscrew itself during operation.
Actually, none of the models should unscrew, properly installed motors, should continue operating wheter normal thread or reverse thread, keep reading you'll discover why:
Looking from the top, a normal thread motor/gearbox with a proper connection, would turn the connecting crank Counter clockwise ensuring a tight connection
Likewise, a reverse thread motor/gearbox with a proper connection, would turn the connecting crank Clockwise ensuring a tight connection as well.
you can always reverse the direction of the motor/gear box, by flipping the winding, trouble is, if it's a single motor for the slider and impeller, then the impeller would reverse direction too !
Moral of the story : there was a mistake with a batch of motors produced, and somehow, they ended up at the wrong stokers ( of course no one would admit to it )