PPC Flashcards
1
Q
torque ratio
A
(basically if the combined engines will perform better or worse).
2
Q
what percent of A/C engine anti-ice not be avail?
A
less than 10%
3
Q
compressibility is?
occurs when?
A
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)