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  • Helicopters: why hasnt NOTAR been more popular?
    NOTAR No tail rotor: use of a ducted fan within the helicopter's body, and venting the air through the side of the tail boom to get the desired anti-torque One big advantage is simplicity and
  • How does the MD 900 accomplish auto rotation with the NOTAR system?
    The MD-900 is a helicopter which seems to be quite popular with law enforcement agencies As you can see, instead of an anti-torque tail rotor, a fan exhaust is directed out slots in the tail boom
  • Why do No Tail Rotor (NOTAR) helicopters use an enclosed variable pitch . . .
    It didn't use a (seemingly complicated) enclosed variable pitch fan driven by the main rotor transmission, neither did it use Coandă effect (even if it may have), like modern NOTAR does Why has a much more complicated solution been adopted for modern no tail rotor systems, and why was AC-14 concept abandoned?
  • How can a helicopter be designed without a tail rotor?
    NOTAR : NOTAR - NO TAil Rotor uses a fan inside the boom to build a high volume of low-pressure air, which exits through two slots and creates a boundary layer flow of air along the tailboom utilizing the Coandă effect The boundary layer changes the direction of airflow around the tailboom, creating thrust opposite the motion imparted to the fuselage by the torque effect of the main rotor
  • When were the first jet engines used? - Aviation Stack Exchange
    From Wikipedia: In 2010, based on the notion that Coandă invented the first jet, the centennial of the jet aircraft was celebrated in Romania This aircraft was built by Henri Coandă, he of the effect that the NOTAR helicopter is based on It was part of an aviation exposition in Paris, in 1910 Claims that it has actually flown are disputed, but not everywhere in the world apparently The
  • How does a helicopter rudder work? - Aviation Stack Exchange
    The NOTAR used a method similar to the tail rotor, by varying the thrust In case of tandem rotors (like Chinook) , the yaw control is obtained by differential lateral cyclic
  • Can a helicopter fly without a tail rotor? [duplicate]
    look for helicopter crashes on youtube, several of them involve tail rotor loss
  • rotorcraft - Why does it take so long to stop the rotor of a helicopter . . .
    If a minute makes a 0 1% difference, it's worth $10k per medevac under that high evaluation A custom coaxial helicopter with rotor brakes will be on the upper side of the price range, but an extra million would pay off over 100 missions Another cost would be noise: coaxials cannot be made as quiet as conventional designs with fenestrons or NOTAR
  • How does a helicopter rotor keep spinning in the same direction when . . .
    @Bianfable I didn't have a problem understanding windmilling I just couldn't understand how it could rotate in the same direction when the wind was reversed, but not the pitch From the answers I got, it seems to be due to the upward slope of most of the underside of the blades when the pitch is low
  • Do coaxial rotors provide twice the amount of lift?
    Because the coaxial rotor does not require an anti-torque device such as a tail rotor, Fenestron, or Notar, a coaxial rotor helicopter requires about 10% less power than a single rotor tail rotor helicopter For the same rotor diameter and power the coax will lift approximately 11% more weight





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