Flight Performance of Fixed and Rotary Wing Aircraft

Nomenclature main symbols

a

=speed of sound, Eq. 2.35; acceleration

a n

= normal acceleration

a t

= tangential acceleration

A

= wing area; disk area

A b

= cross-sectional area of the aircraft

A c

= cross-sectional area of an airfoil

A j

= engine nozzle area

AI

= autorotation index, Eq. 14.12

= wing aspect-ratio

b

= wing span

bt

= moment arm of thrust asymmetry

c

= wing, blade, airfoil chord

c i

= constant coefficients ( i = 0, 1, 2, )

C D

= drag coefficient

C D e

= drag coefficient of idle engine in flight, Eq. 10.83

C D o

= zero-lift drag coefficient

C D v

= vertical drag coefficient

C l

= rolling moment coefficient

C l ?

= derivative of rolling moment coefficient w.r.t. side-slip angle

C l ?

= derivative of rolling moment coefficient w.r.t. aileron deflection

C l ?

= derivative of rolling moment coefficient w.r.t. rudder deflection

C l p

= damping-in-roll coefficient, Eq. 10.65

C L

= lift coefficient

C L max

= maximum lift coefficient

C L ?

= lift curve slope

C N ?

= derivative of yawing moment coefficient w.r.t. side-slip angle

C N ?

= derivative of yawing moment coefficient w.r.t. aileron deflection

C N ?

= derivative of yawing moment coefficient w.r.t. rudder deflection

c

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