RoyBoy posted:Rusty Traque posted:RoyBoy posted:To the folks who keep suggesting putting a flat motor in the rear of a GP-7, there are at least two considerations:
-the truck must rotate, which rotates the motor. After a few degrees of rotation, the round part of the motor might hit the insides of the body.
-the power and torque characteristics of the flat motor must match the characteristics of the forward motor exactly, and at all speeds.
If you look at the SD70 and ES44 motors, they do not rotate with the trucks.
Rusty
I don't run any prototypes newer than 1952, so do not have either of these locos. I was thinking of a vertical motor, a China Drive, if you will. Any vertical motor will have to rotate with the truck, or else the truck will speed up or slow down momentarily when the truck rotates.
Are the motors in the SD70 and the ES44 horizontally mounted in the trucks?
That still does not address my point that both motors must have the same torque and speed characteristics.
The motors on the SD70's and ES44's are mounted to the frame. The trucks pivot around the worm gear. Any speed difference is negligible.
Rusty
