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The Sikorsky XBLR-3 was a four-engine bomber designed in 1935-1936 as a competitor to the Boeing XBLR-1 (XB-15) and Douglas XBLR-2 (XB-19). The original XBLR-3 concept was a twin-boom design with both pusher and tractor propellers and many gun stations.[citation needed] It later evolved into a more conventional four-engine bomber design. The XBLR-3 was the last land plane designed by Sikorsky before the company converted into producing helicopters in 1938.[1]


  1. ^ "Case Files: Igor Sikorsky". The Franklin Institute. 2016-05-27. Retrieved 2021-11-22.