Caterpillar first unveiled its self-propelled rubber-tired scraper in 1948 at the Chicago Construction Equipment Road Show, but it would not be until 1950 that the DW20 and DW21 became available for purchase. Ideally suited for moving dirt on short hauls where the cut and fill areas are close together, Caterpillar scrapers have been on virtually every type of site in Georgia, including the construction of roads, shopping centers, subdivisions, and landfills, and have also been a key production machine in coal-fired power plants around the state.
Although Instructables offers some similar projects, I want to show you how to make a propeller car that can easily be made by many kids in grades 1 and up. As always, please be sure to talk about glue gun safety with your students if they have never used glue guns before.

Many design changes and improvements were made to these two models over their first decade in production until they were replaced with the 600 Series scrapers in 1962. I've found that kids as young as 7 years old can safely and confidently use a hot glue gun if given proper instruction and guidance. You can breath new life into old bands by unhooking them and tying one end into an overhand knot. This project was made possible in part by the Institute for Museum and Library Services, Laura Bush 21st Century Librarian Program grant.

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