RE: Kangaroo-NitroPlanes-Assembly
Motor mounting:
I used the supplied mount and hardware. The mounting screw holes needed a bit of clearance 11/64 drill was used to open the holes in the mounts. This compensated any error preinstalled blind nuts. My OS.50SX had a snug fit between the rails, I broke the sharp corners with a file to relieve stress and it fits fine. I prefer to use 4-40 screws to mount engine. The mounts will be drill and tapped for 4-40 and nylock nuts will installed to prevent the screws from turning loose from engine vibration.
Instruction manual had some errors. One was an editing problem since the blindnuts were installed. The other said the firewall to prop flange on the motor was 145 mm (5.71"). On my plane 108 mm (4.25) was the correct distance to center the propeller between the fuselage and the stabilizer.
A pitts style muffler will by used. Exaust openings point downwind. The muffler was given to me so I do not know the brand and model #.