Da Vinci Catapult Analogue Thermometer this kit leads you from

this kit leads you from the basic launch-zoom-crash and blast experiences to the science of physics behind it all

Part of 4M's Green Science range = stresses recycling

43cm long when built

Kit provides quicksand pit and dinosaur parts (which sink)

Da Vinci Catapult Analogue Thermometer this kit leads you fromAdvanced construction kit. Leonardo redesigned the Medieval catapult in around 1485 and used the spring like energy stored in bent wood to give power to the swing arm. This kit contains all you need precut wood and wing pieces, assembly instructions and tools. Assembly takes 1 hour (+, if from scratch). Kit 25cm W by 19 H, for teens + . Appeals to the engineers or experienced construction kitters.