The concept is very simple. You blow up a balloon, put it on the 'helicopter' and let go. If you are lucky, the helicopter will go up with the balloon until the balloon is empty when it all crashes down.
It worked a lot better than I expected, even if it did not work all the time.
Sometimes it even went up higher than the roof of the house. One time it went up on one side and came back on the other side of the house. Another time it landed on the roof...
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