V Speeds

I knew the definitions of V1 and V2, but what about V3? Turns out we just call it something different on the Dash 8 - it's Vfri (flap retraction speed).  There are a ton of V Speeds, but I'll pick out some key ones. 

V1: engine failure recognition speed

• abort the take-off and bring the aircraft to a stop on the runway plus stopway OR
• continue and be at V2 at 35 feet above the departure end of the runway
• increases with weight

V2: take-off safety speed

• a referenced airspeed obtained after the aircraft lifts off and at which the required OEI climb performance can be achieved

Vmca: aim minimum control speed

• lowest calibrated airspeed at which control of an aircraft can be maintained following the failure of the critical engine with the remaining engine(s) operating at take-off power
• determined at gross weight with the C of G at the aft limit, flaps in take-off position, landing gear retracted, and the propeller windmilling if no autofeathering system is installed

Va: maneuvering speed

• maximum speed at which full deflection of the primary flight controls will not cause overstressing of the aircraft