PPC

Question 1

torque ratio

Answer 1

(basically if the combined engines will perform better or worse).

Question 2

what percent of A/C engine anti-ice not be avail?

Answer 2

less than 10%

Question 3

compressibility is?

occurs when?

Answer 3

When Mach number of advancing blade tip section exceeds the critical Mach number for the rotor blade section.
Flow goes from subsonic to supersonic over blade; then shock wave occurs and air becomes subsonic.

• high rotor RPM, weight, density altitude, g maneuvers
• low temp
• turbulent air (because of gusts)

(speed of helo is combined added to speed of rotating rotor blade)