Fifth class student Daniel Connolly today displayed his new ‘invention’ of a torsion catapult which he constructed with his Dad. Daniel was delighted to show his classmates and friends his new project.
Here is a report Daniel wrote himself accounting for all the work and strategies.
…..Two weekends ago I started to build a catapult with my Dad. We found a website that showed us how to make a torsion catapult. We bought all the wood and rope on Saturday and started making it on Sunday morning. First we had to cut the wood into the required lengths. To make the base we needed two 90 centimetre pieces of wood and two 37 centimetre pieces. We had to screw the four pieces of wood together to form the base. Next we had to fix the two upright side pieces to the base; this required us to drill screws diagonally through the side pieces into the base, this was not an easy task. Then we screwed the stop bar to the side pieces. We had to cut two triangles out of a large piece of plywood. We screwed the triangles to the base and the side bars for support. Then we had to drill round holes into each one of the triangles. We also had to drill a hole into the swing arm of the catapult. Then we had to cut a brush pole into two 37 centimetre lengths to form the torsion handles. We tied the rope to one of the torsion handles. We put the end of the rope through one side of the catapult, and pulled it through the catapult swing arm and put it through the other side of the catapult, and looped it round the other torsion handle. We had to repeat this step eight times with the rope. Then we had to tie off the rope end. To make the swing arm go up we had to twist the torsion handles until they can’t be twisted any more. We had to twist the torsion handles in opposite directions. My Dad wanted to go in search of the neighbour’s cats to test the catapult, I wouldn’t let him. My Dad says that’s why its called a CATapult….
Well done Daniel!