Design and Development
World War II created a great demand for military transport aircraft in the United States. Because of initial fears of a shortage of aluminum, the War Department explored the use of other materials for aircraft construction. Budd, the developer of the shotweld technique for welding stainless steel and a manufacturer of stainless steel railroad cars, automobile, bus, and truck bodies, hired an aeronautical engineering staff and worked with the U. S. Navy to develop a new twin-engine transport aircraft constructed primarily of stainless steel. The U.S. Navy accepted the proposal for the new aircraft, and placed an order for 200, to be designated RB-1. The U.S. Army Air Forces (USAAF) followed with an order for 600, designated C-93.
The Conestoga was a twin-engine high-wing monoplane with tricycle landing gear. The elevated flight deck was contained in a distinctive, almost spherical nose section. Its two 1,200 hp (890 kW) Pratt & Whitney R-1830-92 air cooled 14-cylinder, twin-row, radial engines, the same engines fitted to the C-47, drove three-bladed Hamilton Standard Hydromatic constant-speed, full-feathering propellers and powered a 24-volt electrical system. While the fuselage was thin-gauge stainless steel, only a portion of the wing was made of the metal; the trailing section of the wing and all control surfaces were fabric-covered.
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