PPC Flashcards

1
Q

torque ratio

A

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

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2
Q

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

A

less than 10%

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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)

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