HSD 747 90mm EDF Gear door fixes

thingiverse

The gear doors on my HSD models 747 (4x 90mm EDF RC airplane) have had a few problems due to my abusive landings. The doors rotate on pins that can break off, and also the control horn can snap off. This is weirdly specific (because it isn't a very high-volume RC airplane), but other HSD airplanes use the same system, so maybe somebody can use these files. 1. The "gearbrace" file is for the control horn on the main gear doors. If it snaps off the base, it would not work to just glue it back on. You need some brace around it to hold it to the mount. This part fits over the mount and gives you a slot to glue the control horn in. 2. The "gearpin" is for those gear doors that are attached to the landing gear with a ball link, and rotate on (weak) plastic pins. If a pin breaks off, these shaps can be printed to replace them. They have a lot of contact surface area with the rest of the gear door (assuming just the little pin is what broke off, which is exactly what happens if you bang the door on something). I put these into the holes, then clamped and expoxied them to the gear doors. Very simple fix. One is left facing, one is right facing. This have to be strong, especially the pin. I printed in "Tough 2000" resin on a Formlabs Form 3. It would not work to use a more fragile resin. Well the "gearbrace" might work since it is just to give some surface area to epoxy to. But the "gearpin" is structural. When I am able I will upload some photos of the installed parts to clarify where they go.