Motormount for Graupner Cirrus, Cirrus 75 and Cumulus pylon

thingiverse

This is another motormount designed specifically for the original Graupner Cirrus and Cirrus 75 pylon, offering a more refined and forward-thinking approach. Perhaps this revised design will even improve the center of gravity. Developed to accommodate the Turnigy Aerodrive 3536 1050kV motor on the high-quality aluminum Graupner motorpylon, originally intended for use with a small nitro engine in a wooden pod designed for the Cirrus 69, Cirrus 75, and Cumlus models. I considered bending the aluminum to create a more elegant look, but ultimately chose not to alter its square shape. A hole is carefully crafted where a 3.5 mm steel pin has been glued in place, ensuring that it will never come loose, or you can opt for gluing a glassfiber rod into the space instead. The total height of the motor axis to the fuselage provides ample clearance for using large folding props up to 13 inches in diameter. The front side remains square, allowing for the attachment of balsa wood and subsequent sanding, filling, priming, and painting to create a sleek aerodynamic surface. Notably, I elected not to drill holes for attaching the mount directly to the aluminum pylons; instead, you will need to perform this task yourself using a 3 mm drill or, preferably, a piece of hot piano wire or thin nail. This motormount was printed in PLA and has proven remarkably strong. You can also choose to print an 8mm thick ring if additional space is required for the axis, as demonstrated in the accompanying photo where I installed the extra ring. Wishing you happy flying experiences with this revised design.