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  1. asianobserve

    First look at ultra-fast Sikorsky/Boeing SB-1 Defiant dual-rotor helicopter

    Another chubby early coaxial helicopter: Gyrodyne GCA-2 (1947)
  2. asianobserve

    First look at ultra-fast Sikorsky/Boeing SB-1 Defiant dual-rotor helicopter

    An even earlier coaxial helicopter: Gyroplane Laboratoire (1933)
  3. asianobserve

    First look at ultra-fast Sikorsky/Boeing SB-1 Defiant dual-rotor helicopter

    Coaxial helicopters have been in existence for sometime. One of the first coaxial helicopter: Brantly B-1 (1946)
  4. asianobserve

    First look at ultra-fast Sikorsky/Boeing SB-1 Defiant dual-rotor helicopter

    SB-1 Defiant flight demo and testing: This looks like an elegant design. I like this design more than the Valor. The Valor looks too heavy on its wingtips that it could tip over in an uneven landing ground.
  5. asianobserve

    First look at ultra-fast Sikorsky/Boeing SB-1 Defiant dual-rotor helicopter

    The Army is looking for a replacement for the Black Hawk helicopter, and test pilots like what they see Sikorsky-Boeing officials said the new aircraft design will be capable of flying at speeds of more than 200 knots, or 230 miles per hour, and maneuvering like a fine-tuned sports car. Test...
  6. asianobserve

    First look at ultra-fast Sikorsky/Boeing SB-1 Defiant dual-rotor helicopter

    https://newatlas.com/sb-1-defiant-sikorsky-boeing-coaxial-helicopter/57803/
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