CS 22.49  Stalling speed

CAA ORS9 Decision No. 1

(a) V_S0 is the stalling speed (CAS), if obtainable, or the minimum steady speed at which the sailplane is controllable, with: 

(1) landing gear extended; 

(2) wing-flaps in the landing position; 

(3) air brakes retracted or extended whichever position results in the lowest value of V_S0;  (4) maximum weight; and 

(5) c.g. in the most unfavourable position within the allowable range. 

(6) For a powered sailplane: 

(i) the engine idling (throttle closed); 

(ii) propeller in the take-off position;

(iii) cowl flaps closed.

(b) The stalling speed in the landing configuration must not exceed: 

(1) 80 km/h with: 

(i) air brakes retracted; and at 

(ii) maximum weight with water ballast tanks empty. 

(2) 90 km/h with: 

(i) airbrakes retracted, and at

(ii) maximum weight with water ballast. 

(3) 95 km/h with: 

(i) airbrakes fully extended; and at 

(ii) maximum weight with water ballast. 

(c) V_S1 is the stalling speed (CAS), if obtainable, or the minimum steady speed at which the sailplane is controllable with the: 

(1) sailplane in the configuration existing in the test in which V_S1 is being used; and 

(2) weight used when V_S1 is being used as a factor to determine compliance with a required performance standard. 

(3) For a powered sailplane: 

(i) the engine idling (throttle closed); 

(ii) propeller in the take-off position;

(iii) cowl flaps closed.

(d) Reserved.

(e) V_S0 and V_S1 must be determined by flight tests using the procedure specified in CS 22.201.