The Sikorsky XBLR-3 was a four-engine

bomber A bomber is a military combat aircraft designed to attack ground and naval targets by dropping air-to-ground weaponry (such as bombs), launching aerial torpedo, torpedoes, or deploying air-launched cruise missiles. The first use of bombs dropped ...

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 multiple gun stations. 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.

References

* * BLR-3 Cancelled military aircraft projects of the United States Four-engined tractor aircraft Low-wing aircraft Four-engined piston aircraft {{aero-1930s-stub