Piper PA-24-250 COMANCHE Pilot Operating Handbook page 32

A~rcrart Pobl~cat~ons
Pipcr Corn;inchc
250 (Early Model)
Section
-
1
General
SYMBOLS, ABBREVWTIONS AND TERMINOLOGY (Cont.)
V , ,
Single-Engine Minimum Control Speed - Obsolete term more precisely defined by the
following three entries:
V>lcz,
Single-Engine Minimum Control Speed (Airborne)
-
Minimum flight speed determined by
FAA regulations at which a multi-engine airplane is directionally controllable with the critical
engine inoperative. Conditions include: propeller windmilling on the inoperative engine,
takeoff power on the operative engine, a five-degree bank toward the operative engine, most
rearward C.G., landing gear retracted and flaps in takeoff position. (Red radial line.)
Vsrcc Single-Engine Minimum Control Speed (Ground) - Minimum speed at which a multi-
engine airplane can maintain directional control on the ground during the takeoff run after
failure of the critical engine. Conditions include: application of less than 70 kilograms (155
pounds) pedal force without going off the runway (preferably while holding centerline) with
a 7+ knot crosswind component and a wet surface.
V>lcL Single-Engine Minimum Control Speed (Landing)
-
Minimum speed at which a multi-
engine airplane can maintain directional control in the landing configuration after failure of
the critical engine.
VNE Never Exceed Speed
-
The airspeed limit that may not be exceeded at any time. Equal to VD
minus 10 percent. (Top of yellow arc, and redline.)
Vso Normal Operating Speed, and Maximum Structural Cruising Speed
-
The level flight speed
of an aircraft at its optimum altitude with the engine operating at no more than 75 percent of
its rated horsepower. This airspeed should not be exceeded except in smooth air. (Top of
green arc, and bottom of yellow arc.)
Vp Obsolete term for Maneuvering Speed. This term is now used as designation for propwash
velocity.
VR Rotation Speed
-
The speed at which the maneuver to increase the wing angle-of-attack is
performed in order to accomplish lift-off attitude.
VREF Reference Speed - Any referenced airspeed
Vso Stall Speed With Full Flaps and Gear Extended - Minimum steady flight speed at which the
aircraft is controlIable in a landing configuration. (Bottom of white arc.)
Vsl Stall Speed With Flaps and Gear Retracted
-
Minimum steady flight'speed at which the
aircraft is controllable. (Bottom of green arc.)
Copyright:
1993
Page
1-20