gerryndennis, very interesting info about the full scale Skymaster. Many ideas and theories have been posted about the efficiency of the front/rear motors. I generally go with "proven" configurations or intheir absence, the consensus of options and sometimes my "gut" feelings from experience. In this case, I plan to go with the same prop on the front and rear (both spinning in the same direction). After reading your comments, I may go with a pusher prop on the rear to get a counter-rotating configuration (if I can find a match for the front).

Some modelers have reported higher power (mah) consumption from the front motor when using two batteries. I have purchased a data logger and will use it to collect in-flight information. I am anxious to see the flight results.

As for single engine flight, my calculations show about 792W IN for each motor. At 11 lbs, that would result in about 72 watts/lb for a single motor flight. That will probably be enough to get the plane back to the runway, being careful and easy on the flight controls. I hope I don't need to do that. I will not have a means to shut down power to one or the other motor, so it may be a mute point depending on the failure mode for the motor (shorted, motor lockup, ESC, etc.).

Vic