Chapter 4

Question 1

Right or wrong: 𝜆i = Ct/(2root(mux^2 +(muz+𝜆i)^2))
and 𝜆i = Ct/2*mux can be both used in estimating the induced
velocity in high-speed forward flight?

Answer 1

right but only for high v

Question 2

Right or wrong: 𝜆i = Ct/(2root(mux^2 +(muz+𝜆i)^2))
and 𝜆i = Ct/2*mux can be both used in estimating the induced
velocity in low-speed forward flight?

Answer 2

Wrong, 𝜆i = Ct/2*mux cannot be used to calculate the induced velocity in low-speed forward flight.

Question 3

By optimising the pre-twist angle, which component of the power consumption will be reduced?

Answer 3

profile power

Question 4

By optimising the geometry of the fuselage, which component of the power consumption will be
reduced?

Answer 4

parasite power

Question 5

Which component of power will increase due to the tip blade compressibility effect?

Answer 5

profile power