Nimue and I experimented with some different rocket materials this afternoon. [Insert maniacal laughter here.]
New rocket on the left: craft foam and clear packing tape, 12 gram total weight, no appreciable destruction after repeated launch and crash cycles.
Old rocket on right: paper and masking tape, 17 gram total weight, crumples on repeated impact...
Hmmm. Still cheap, more colorful, less likely to be destroyed -- the new one wins! The lower weight of the new rocket means it flies higher at a given input pressure too :)
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