TABLE OF CONTENTS In addition to determining the stalling speed, a knowledge of the aircraft's characteristics as the airplane stalls is important, since if an inadvertent stall should occur we want the airplane to be well behaved without a tendency to enter uncontrolled flight. Therefore, an investigation of the stall characteristics of the airplane is an important part of any airplane certification.
As stated in Chapter 4, defining when the stall occurs is important since several different definitions of that event exist. In fact, there are several different definitions in the Federal Air Regulations. CAR 3 (Ref. 1) and FAR 23 (Ref. 2) define the stall as the airspeed when the nose pitches uncontrollably or the elevator control reaches the up stop. The current FAR 23 further says that for determining stall characteristics the elevator must be held against the up stop for two seconds before recovery can be initiated. However, FAR 25 (Ref. 3) defines the stall as the minimum airspeed seen during the maneuver. In this text we will use the CAR 3/FAR 23 definition.
Civil Aeronautics Regulation 3 covers stall characteristics in sections 3.120, 3.121, 3.122, and 3.123.
CAR 3.120 states that stalls must be demonstrated both with power-off and with power used to demonstrate climb performance for airplanes over 6000 lb TOGW, or for airplanes...
