CS 22.335 Design air speeds

• ED Decision 2003/13/RM found in: Sailplane Rule Book - Part-SAO Part-SFCL CS-22 (Nov 2022)

CS 22.335 Design air speeds ED Decision 2003/13/RM The selected design air speeds are equivalent air speeds (EAS): (a) *Design manoeuvring speed VA*  where: VS1 = estimated stalling speed at design maximum weight with wing flaps neutral and air brakes retracted (b) Design flap speed, VF (1) For each landing setting, VF must not be less than the greater of: (i) 1.4 VS1, where VS1 is the computed stalling speed with wing-flaps neutral at the maximum weight. (ii) 2.0 VSF, where VSF is the computed stalling speed with wing-flaps fully extended at the maximum weight. (2) For each positive en-route setting, VF must not be less than the greater of: (i) 2.7 VS1, where VS1 is the computed stalling speed at design maximum weight with wing flaps in the particular positive en-route setting. (ii) 1.05 VA, where VA is determined in accordance with sub-paragraph (a) of this paragraph, i.e. for wing-flaps neutral. (3) For all other settings, VF must equal VD. (c) *Design Gust Speed VB.* VB must not be less than VA. (d) *Design Aerotow Speed VT.* VT must not be less than 125 km/h. (e) *Design Winch-launching Speed VW.* VW must not be less than 110 km/h. (f) *Design Maximum Speed VD.* The design maximum speed may be chosen by the applicant but must not be lower than:  (km/h) for sailplanes of Category U  (km/h) for sailplanes of Category A where:  = Wing loading (daN/m2) at design  = The lowest possible drag coefficient of the sailplane For a powered sailplane, VD must also not be lower than 1.35 VH.