Helicopter - rubber band powered

thingiverse

Create a simple, fun helicopter model with two propellers, a paper clip, and a rubber band for power. The design is easy to print and build, with a quick assembly process. To print, use ABS or PLA, keeping the body light at 2 perimeters and 20% fill. Add a 2mm brim to help secure the propellers to the print bed. Propellers are 200mm long and can fit diagonally on a 150mm square print area. Drill small holes for shafts, using a paper clip as the propeller shaft or stiffer piano wire from a model supplier. Bend the paper clip into a hook shape to fit into the off-center hole in the propeller hub. Fit one shaft into each propeller; glue is optional. Warm the center section of the propellers with a fan heater or boiling water, then twist 60 degrees between the hub and wider part of each blade. Repeat for the second propeller, ensuring they are mirror images to lift when spinning in opposite directions. Sand the corners of the propellers if desired. Slip the shafts through the body holes and bend hooks to fit the rubber band. Vary the strength and number of rubber bands and turns to optimize flight performance. Be cautious flying indoors to avoid damaging walls and ceilings, or outdoors to prevent roof landings. Enjoy your fun, simple helicopter model!