Comments on: Sikorsky XR-4 (VS-316A) 41-18874 at Wright Field, 17 May 1942.

Comments on: Sikorsky XR-4 (VS-316A) 41-18874 at Wright Field, 17 May 1942. https://www.thisdayinaviation.com/17-1942/sikorsky-xr-4-vs-316a-41-18874-at-wright-field-17-may-1942/ Important Dates in Aviation History Thu, 17 May 2012 14:35:39 +0000 hourly 1