3DLabPrint Piper Pawnee (Dusty) motor mount

thingiverse

Reinforced Motor Mount for the Piper Pawnee from 3DLabPrint. This modification provides several key features: * It utilizes the original SK3 (3542) metal motor mount plate for reinforcement. * A cooling channel is integrated into the motor mount to keep airflow close to the motor vent holes, increasing the strength of the motor mount plate. * A small gap at the mating surfaces between the motor mount and the fuselage allows for a strong bonding with CA glue, eliminating the need to fill large gaps as in the original design. * Holes on the front of the motor mount facilitate easy gluing of the fuselage ribs to the motor mount, further strengthening the motor mount's bond to the fuselage. Assembly steps for the reinforced motor mount: 1. Attach the SK3 metal mount plate to the internal side of the printed motor mount using thread lock and nuts. 2. Secure the motor mount to the fuselage with M3 countersunk-head screws. Pre-drill 2.5mm holes in the fuselage for a secure fit. Tighten all screws firmly to ensure the motor mount is properly seated. 3. Apply CA glue into the small gap around the motor mount, allowing it to fill by capillary action. Remove excess glue and apply an activator. 4. Fill accessible gaps around the motor mount and ribs with CA glue inside the fuselage. Use an activator for optimal bonding. 5. Apply CA glue to the small holes on the front where the ribs meet the motor mount (refer to images). 6. Secure the motor in place using original screws with thread lock. Although this plane has not been tested in flight, it feels incredibly solid. I'm confident that if it does come loose, it will only be when the entire nose section separates. I used high-temperature resistant ABS (Zortax ULTRAT) for this modification, which offers exceptional strength and durability at high temperatures. With the original SK3 metal mount plate providing additional reinforcement and a cooling channel to dissipate heat, I believe this design should also work with PLA, possibly even without annealing. However, be aware of the shrinkage that occurs during PLA annealing and account for it by using upscaling techniques. Important notes: * The motor is positioned a few millimeters backward from its original location due to the use of the original motor mount plate between the motor and printed mount plate. * Ensure you compensate for any shrinkage caused by annealing PLA when scaling your design.