Balloon Powered Radial Engine

youmagine

Run by just blowing air into it. Demonstration: Exploded view in 3D viewer: https://skfb.ly/6LQBR There's a LEGO compatible version of the motor: https://www.youmagine.com/designs/air-balloon-motor-for-lego If you like how it works, support me by purchasing the Pneumobile chassis: https://cults3d.com/en/3d-model/game/pneumobile-pneumatic-toy-car (3D Viewer: https://skfb.ly/6LV6D) Extra parts needed: * M3x8 Bolts (15) * M3 Nuts (15) * Thin Nitrile Gloves (thumbs from M-sized gloves worked best), or Silicon (worse) or PET (not tested) ones Optional parts: * M3x12 or longer bolts (2) * M3 Nuts (2) * 6x4mm Silicon Pipe (found in aquarium shops) * M5x10mm Washers (2) (instead of printed ones) * 105ZZ Bearings (2) (noticed no difference in performance) Parts with "X_" in their names are optional. Assembly: * Use the 3D diagram as a guide: https://skfb.ly/6LQBR * Cut off a glove finger tip (thumbs from M-sized glove worked well) * Pull it onto a Cylinder_Ring (use Helper_Finger to leave enough height) * Connect a Piston to it with two Washers * Clamp the Cylinder_Ring between Cylinder_Plate and Cylinder_Lid * Clip them with Helper_Clamp so they won't fall apart at once * Bolt them together to Plate_Top * Repeat for the other 2 cylinders * Insert the Crank with 2 Washers * Fix it in place with Frame_Bottom * Bolt all the parts together * Put the Valve_Inner in place * Bolt the Valve_Lid into place * The engine should be running! Troubleshooting: 1. Rotated freely by hand, but struggling when working - the inner valve may have too much friction against the frame (sanding the valve and the frame may help for a while). 2. Jams on a certain cylinder - this glove finger may need a bit more slack. 3. Isn't rotated freely by hand - gears bolted too tightly to frame (should have a bit of play), some gear teeth didn't print very well, or the whole gear printed with "elephant foot" and runs too tight with another gear.