Simply lay the matches head to head in the middle of a small rectangle of foil.Then wrap the foil around the matches but twist it tightly around one match and leave it loose around the other, so that the loose match can slip out easily (when a match head ignites it tends to expand slightly and can get stuck).
Prod the loose match into the ground at an angle of roughly 50o. Hold a flame on the foil and wait for lift-off!
You can see from all the spent matches in the video below that we had a lot of fun with this one. I have to admit that the launch we recorded is a bit lame - one of our attempts managed to fly just over 3 metres but we didn't manage to catch it on film.
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