12 4 x 1 9 July 8, 2019 16 32 64 128 3 5 x 12 )=- 4 x 9 )+ 1 Yamaha propeller 12 1 4 x 9 g X 12 x 9 x 4 x 1 0 12 3 4 x 9 1 2 12 1 4 x 9 prop 12 1 4 x 9 g 9 16 12 x 4 1 2 12 x 2 1 4 in 90 degree duct elbow 5 x 9 4 12 x 1 12 3 8 x 9 1 4 9 1 4 x 12 propeller 4 9 7 12 x 1 3 23 1 4 x 12 2 9 7 12 divided by 1 4 x 9 14
