This helicopter uses coaxial or contra-rotating blades instead of a main lifting rotor and smaller anti-torque tailrotor, because this design is easier to make and is more practical for rubber-power. I have also made "normal"-looking rubber band helicopters but they require more parts and time to make. They also do not fly for as long as this design can and they don't work without an auto-stabilizing flybar system, plus you have to add a pulley system to spin the tailrotor and this creates a bigger probability of a part not working from over-complication of what should be a much simpler machine.
Throughout this instructable I include dimensions (in brackets) of parts on this helicopter but your scale will probably be different to mine so provided you keep your scale correct to the photographs your helicopter should work just as well as mine.
To make one like this one, you will need:
- A bamboo chopstick (or other strong, light wood if you prefer)
- Thin wood offcuts (I used balsa)
- Aluminium from a can (make sure the can you use is aluminium first, you can do this with a magnet because aluminium is not magnetic under normal conditions.)
- Foam sheet(s)(I use the kind of polystyrene found in food packaging)
- 2 Pins
- A paperclip (You won't need the actual paperclip, just the plastic insulation around it. If you don't have a paperclip with this insulation on it, then you will need to find a small tube that one of your pins can easily fit through without too much wiggle-room.)
- 4 Small Beads
- Plastic (From an ice-cream or yoghurt container)
- An Elastic/Rubber Band (I find that many small ones strung together works better than one bigger one)
- Tape (Most types of glue dissolve the polystyrene foam)
- Craft knife/scalpel
This is a fun toy to use and does not take much time to make (and it will cost you virtually nothing since most people throw away the majority of materials needed).