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The Douglas XC-115 was to have been a version of the XC-114 powered by four 1,650 Packard V-1650-209 engines. The XC-114 itself was an extended version of the C-54 Skymaster, with the fuselage extended from 93ft 10in in the C-54 up to 100ft 7in. Two prototypes were built, one XC-114 and one XC-116, which was the same design but with thermal de-icing equipment in place of the normal pneumatic boots of the C-54. The XC-115 itself was never built.