We went to the Aerospace museum this past week. They had a centrifuge there that had a digital display. When the hand crank was turned, the centrifuge turned and you could see the MPH & RPM, G-Force and (DS just said the "pounds" ??)

Anyway, he wants us to make him one. The Tinkertoy model based off his schematic of it just isn't the same.

Now he wants to visit Radio Shack to see if they have parts. smile