First flight of the Sikorsky VS-300 (2nd configuration)
Wednesday, March 6, 1940
- Stratford Army Engine Plant, United States of America 
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Description
In this configuration cyclic pitch control was locked out and replaced by two horizontal tail rotors. Source: "S-46/VS-300/VS-300A Helicopter", Jimmy Devine, Sikorsky Product History | Sikorsky Archives web site, January 2013
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