V=0 – Velocity at lineup
VS – Stall Velocity (airspeed at which enough lift can be generated to remain airborne)
VMC – Minimum Controlled Airspeed with the critical engine inoperative
V1- Critical engine failure recognition speed. (> VMC)
VR – Rotation speed. (5% > VMC)
VMU – Minimum un-stick speed - the point at which the aircraft could take off if the maximum possible rotation angle were reached. This maximum angle would occur if the tail of the plane were to actually scrape the ground. (> VS) VLOF – Lift-off speed. Liftoff speed must be at least 10% greater than VMU when all engines are operating and 5% greater when one engine has failed. V2 – Takeoff safety speed must be reached at an altitude high enough to clear a given obstacle. For FAR 25 aircraft, the obstacle clearance height is 35 ft. The takeoff climb speed must be at least 20% greater than stall speed, VS, and 10% greater than VMC.
thts wat i learnt frm my aerodynamics class...i dnt rmr it though cz i hvnt strtd flying big airplanes wer i hve all thse v-speeds..still wrking on my comm..i hop tht helps..hve sme mre notess on tht if u need..safe flying..