Jun 21, 2017 · 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 ruggedness: no tail rotor to get damaged, no tail rotor gearbox or driveshaft to wear and/or malfunction. Another is noise: NOTAR is quieter.

Jan 1, 2015 · 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 ...

Sep 16, 2015 · 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 engine was a 50 hp piston engine driving a cowled fan.

Dec 9, 2024 · 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.

Sep 28, 2015 · In the event of a total failure of the tail rotor, is it possible to maneuver a helicopter to an emergency landing spot that is within, say, 30 minutes flying time? What are the maneuvers require...

Nov 5, 2015 · In case of helicopters without a tail rotor, the yaw control is obtained in different ways. 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 …

Oct 17, 2024 · Propellers and rotors create thrust by accelerating the air that passes through them. A smaller rotor blows a small amount of air at high speed, a large one blows a large amount of air at low speed, but the force (or momentum change) is the same.

Dec 16, 2015 · The Canard rotor/wing demonstrator, later called the X-50 Dragonfly was a Stop-Rotor Rotary Wing Aircraft made by Boeing and DARPA to demonstrate the principle that a helicopter's rotor could be stopped in flight and act as a fixed wing (like in movie The Sixth Day).

Jul 22, 2019 · A guy in my glider club used to fly them. It's something to do with achieving a vertical lift component of several hundred pounds from the tail rotor's thrust, and that and the large horizontal tail allow a large C.G. range by helicopter standards, as well as adding a bit to the total vertical lift capability.

Aug 27, 2015 · $\begingroup$ It gets a little more complicated for helicopters than your first paragraph implies. On a traditional plane, thrust and lift are easily separated; the propeller produces thrust, the wing produces lift, and these two forces operate at …