Sikorsky XR-4 41-18874 first flight 13 January 1941 Published on June 22, 2012 in 14 January 1942Full resolution (375 × 188) ← Previous Next → Vought-Sikorsky XR-4, serial number 41-18874, first flight at Stratford, CT, 13 January 1941. (Sikorsky)