Originally Posted by
PDR1
Ahem...no!
If you install a prop back-to-front you here a prop still thrusts in the same direction, just less efficiently. If you had one "normal" and one "reverse" prop installed you'd get about 25% net thrust, and a walrus would barely get to a fast trot with that sort of thrust.
PDR
Ahem er . .
If half the pair of props was right and the other half wrong you might have a case that the reversed one only delivered half normal thrust so 75% of expected net thrust would be more like it.