I am building a Cessna Skymaster 337 model made by Seagull. This plane has two in-line motors, one forward (tractor) and one rear (pusher). It has the following specs:

• Wing Span: 76.8 in
• Wing area: 806 sq in
• flying weight 10-11 lb

I will be converting this model to electric and using two Scorpion S-3032-8 motors. Using the Scorpion Calculator, these motors will generate 2081 gf static thrust with an APC 10 x 7E prop (635 Watts IN). My questions are:
1. Should I double these numbers to calculate the total thrust generated by the two in-line motors OR is there some thumb rule for calculating the total thrust for in-line configured motors?
2. How do I calculate the power generated (watts) for the in-line configuration?

Thanks,
Vic