I used lost foam construction to fabricate a fiberglass air scoop for my son’s Formula Continental C race car. Our project started because a modification to the shape of the race car body necessitated the construction of a new air scoop. The air scoop is bolted to the car body so if either the air scoop or the body is damaged (a very likely scenario), the repair will be simpler. To fabricate the scoop, I made a Styrofoam male mold, surrounded the mold with fiberglass, and then dissolved the Styrofoam to leave a hollow part. I used Styrofoam to build the male mold for several reasons. It is readily available at most lumberyards, it is easy to shape with files and sandpaper, and it is easy to dissolve with lacquer thinner.
What has eyes yet cannot see? A potato. But not this one. This special spud is 15 feet long and hangs in an indoor/outdoor market. It also houses a security camera which peers out of smoked Lexan® eyes. So this potato does see, guarding the real potatoes and bananas from would-be vegetable larcenists.
Suppose you needed a 15 foot-long potato. Well, not a real potato, but a sculpture that looks just like a potato. Unlike your run-of-the-mill spud, this one would have to hang outside exposed to wind and weather. It would need to be sturdy and light weight. You’d also need it to last a long time — no rotting allowed. What would you make it out of? Continue reading →