BUILD A PULL-STRING HELICOPTER AND LAUNCHER (not fully developed)

This project is under construction but I don't have the time to work on it now. My students used to make these helicopters and launchers. They would go amazingly high in the air--as high as the tallest trees. But they have to have weight in the tips to have the momentum to keep them going (the flywheel effect). If not built correctly or if the copters get banged up, the centripital force causes them to fly apart dangerously. So I tried using non-hardening modeling clay instead of coins for weight. But modeling clay eventually releases an oily substance that causes tape and glue to fail. So now I'm going back to a non-symetrical airfoil and coins or steel washers again. I was developing a launcher that gets the spinning copter overhead. That is safer if the helicopter is not built correctly and tears itself apart at high speed (and that happens a lot with beginners), but the overhead design is awkward. There's a lot more work that needs to be done on this design and I don't have the time now. I feel a lot better about this wind-up helicopter design that works very well http://www.sciencetoymaker.org/dragnflyHelicopter/index.html and is much safer.

You can see the rough first draft of the introduction and instructional video here https://www.youtube.com/watch?v=k3xPFlFPSwM
Here are the instructions for making the launcher
Here are instructions for the helicopter.

THESE ARE FOR ARCHIVAL PURPOSES AND FOR EXPERIMENTERS. THE DESIGNS ARE NOT YET GOOD.

Here are some still pictures from the introduction and instructions.

   

Check back the final version of the instructions.

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