CFI Pop Quiz #317 - Speed

[Chris Burgess]

The forward speed of a rotorcraft is restricted primarily by

A) Dissymmetry of lift.
B) transverse flow effect.
C) high-frequency vibrations.

[JByrd]

Aye

Jim B.

[Vance]

D) horsepower
Thank you, Vance

[KenSandyEggo]

E) How much money you have to spend.

[birdy]

terminal vilosity.

[EI-GYRO]

A/ pucker factor.= max noise.

[Ga6riel]

A, or in lesser circumstances, when thrust = drag

[GyroRon]

A................................

[Paul_Zurawski]

Ehhhhhh....(A)

[Chris Burgess]

"A" is the correct answer. The forward speed of a rotorcraft is restricted primarily by (A) dissymmetry of lift. Reference FAA-8083-21, Chapter 3

As forward speed increases, the difference in the speeds of the advancing and retreating blades becomes greater. At a high forward speed, the slow airspeed of the retreating blade gives it such a high angle of attack that it stalls.

[Vance]

There are people who feel that if you spin the rotor faster a gyroplane will go faster. I read a paper that Cierva wrote about how to build a 200 mile per hour Autogiro. He did not imagine any challenges that could not be overcome.

Thank you, Vance