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Catapult

YowCH built a catapult when he was about 10. Using similar materials, Esther and David helped build another one:


The lump of Blutack flies about 1.0m, and given the catapult is about 10cm high, the range is about 10x the height. A real catapult would be about 10ft high, meaning this will throw a decent stone about 150ft. With higher rope tension and a stronger frame (glued instead of lashed with ropes), the range can effectively be 3 times more!