The Clark air Crawler model CA-1 widely known as the Clark CA-1 was a small airborne bulldozer designed for improvement of runways in World War Two by the United States Armed Forces. Bulldozer Sound Effects (11) Most recent Oldest Shortest duration Longest duration Any Length 2 sec 2 sec - 5 sec 5 sec - 20 sec 20 sec - 1 min 1 min All libraries Radio Mall BLASTWAVE FX Airborne Sound Sound Ex Machina Twisted Signals.Clark CA1 towing a Choate CAB-1 Pan scraper to finish an airfield.Ĥ cylinder water cooled Waukesha Model FC