My son is in 5th grade, which means it's science fair time in this county. After ruling out all the ideas that were improbable if not impossible, such as the robot butler and the hoverboard, and the things I was not willing to do, like the paper mache volcano or winding 40 feet of copper around a motor armeture, we stumbled across ballistic trajectory as a topic. Which totally called for catapults.
Had my son draw up a design first:
Then grab some scrap out of the bins:
He crosscut the maple base and frame arms with the sled.
Then he cut the finger joints on sled jr.
I did the single rip cut because it was fairly narrow, then he took over with the walnut for the multi-angle base.
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