Figure

Dear Clyde,

Just got PMA. 05 and saw your little article on Caltrops. There's an even easier way to make them out of about 1/32" sheet steel that needs only a pair of tinsnips (although compound leverage aviator's snips would be easier to use ). Just cut a piece of sheet steel to the shape shown in Figure I, then twist 90° across the narrow waist, see Figure 2. The Caltrop will sit on one edge and one point with the remaining point sticking up. See Figure 3. The 1/32" thickness is okay for passenger cars, but heavier metal should be used for trucks and other large vehicles. With nothing but scrap steel, a pair of tinsnips, and a couple of hours, you can have hundreds of these little devils!

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