Thursday, June 26, 2008

Trebuchet: Part 11

Here I have attached the trolley block to the end of some twine which has the other end wrapped around the winch axle. The line goes down and traverses the length of the trebuchet underneath where the trough will be.

Here is the trigger system. The closest dowel has a loop of twine tied to it. The further dowel has a lever with a pin on it. When the arm is down, the twine will go over it and hook onto the pin on the other side. To fire, the latch gets pulled, the pin goes up, and the twine loop is released, which releases the arm.

It is completed! The sling is now hanging from the end of the arm. The trough is now lying along the centerline. I'll try firing it tomorrow after the firing mechanism has had plenty of time to dry. I bought about 500 water balloons for four bucks. By the way, the winching system isn't really necessary for the operation of this small size trebuchet. This is just table size, so it's small enough that it's easy to just pull the arm down. But it's great to see how the arm was pulled down on full size versions back in the day.

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