The gear ratio is 1 to1 in this setup. The torque & HP are doubled & the rpm's stay the same (minus any gear loses). Properly designed spur gears typically have efficiencies greater then 98% (Dudley"s Gear Handbook; 2nd edition; chapter 12). At the center output shaft the HP is 14.6; the torque 460.8 in oz; & the rpm 32,000. Total weight of the pictured unit is 5 lb 12 ozs. The flywheel has been removed from the center gear for clarity of the gear mesh. Both motors rotate clockwise with custom made inverted drum valves & the propeller shaft rotates counter clockwise allowing the use of available left hand propellers. Full blade area 2170 propellers, with 7.125+ inches average pitch, are being used with this setup!
