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 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
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
lift - How do helicopters hover? - Aviation Stack Exchange I know that helicopters blades are like rotating wings that generate lift in the same way, but how does this make a helicopter hover? Other question; how does the tail rotor help with the balance
Why arent modern helicopters quieter? - Aviation Stack Exchange Living closer to a Sikorsky factory, I can attest that modern civilian (and military) helicopters are quite noisy In any case, they are considerably louder than light aircraft, turboprops, and eve
What kinds of planes can tow banners? - Aviation Stack Exchange Planes can sometimes be seen towing banners around large cities or events What kind of plane is good for this type of flight? With banners they appear to be flying slower than usual Is this jus