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Hey, fantastic job recreating this. I scaled up your design to the size of a 1 x 2 (If I had scaled to a 2 x 4 it would had had dimensions of 12 to 13 ft!), but then I used 2 x 4's for construction because I figured the forces involved would increase exponentially and needed more support. It stands about 6.5 feet tall. It's very interesting to see the violent shaking of a dry fly compared to the nearly silent transfer when loaded with a projectile. Putting wheels on it also helps because it forces all motion into a linear direction. I had to fill in the final details with some imagination and research and I have yet to do a full test because it's still in my back yard, but it throws head sized water balloons about 50 yards with barely any counterweight filler. It hits like a line backer, it knocked my cousin off his feet at 50 yards. I'm going to put a trash bag in the bucket, fill it with sand, and water it down for throwing some rocks and maybe a watermelon when I take it to a field. I have some videos i'll try to upload.
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