Pylon and motormount in one for RC gliders with glassfiber fuselage

thingiverse

I mounted a Pylon on top of my Multiplex Super Alpha (aka Nimbus) from 1977 GFK rc glider using a 6 mm bolt. I drilled the front hole up to 5.5 mm, then screwed in the 6 mm bolt and cut off its head, leaving just enough thread for attaching the motormount with this 6mm thread and nut to the fuselage. If you think 6mm is too much, use a 4 or 5 mm bolt and nut for the front hole instead. I used a 4 mm bolt and nut for the backhole. For the rest of the 4 mm front hole leading up top, glue in a 3 or 4 mm fiberglass or steel rod to prevent it from breaking. Secure the motor on top with 3 tieraps and some double-sided tape to keep it in place. If the pylon doesn't fit perfectly onto the fuselage, heat that part up in hot water and bend it into shape. Put some protective tape between the fuselage and pylon to protect your model. I designed this pylon for a Turnigy Gliderdrive SK3-3850 960 kv motor with an 11x8 folding prop and 3300 3S lipo. It might be too powerful for the thin wings, but we'll see how it goes. I used the same pylon on a Graupner Cirrus 75 and it worked great. Just remember to add some up elevator during takeoff because the elevated motor pushes the nose down slightly. The front of the pylon is 10 mm wide and flat; you can glue some balsa or foam to it and sand it into an aerodynamic shape.