2nd October 2019


What is VAC speed?

VAC — Missed-approach climb speed for flap configuration with critical engine inop (2.1 percent climb gradient). VAP — Approach target speed. VREF plus configuration (flaps/slats setting) and wind factor. Typically add (to VREF) half the headwind component plus all the gust factor (to a max of 20 knots).

Regarding this, what is the speed for takeoff?

A headwind will reduce the ground speed needed for takeoff, as there is a greater flow of air over the wings. Typical takeoff air speeds for jetliners are in the 130–155 knot range (150–180 mph, 240–285 km/h). Light aircraft, such as a Cessna 150, take off at around 55 knots (63 mph, 100 km/h).

What is the v1 speed for a 747?

AircraftTakeoff WeightTakeoff Speed
Boeing 757240,000 lb 108,860 kg160 mph 260 km/h 140 kts
Airbus A320155,000 lb 70,305 kg170 mph 275 km/h 150 kts
Airbus A340571,000 lb 259,000 kg180 mph 290 km/h 155 kts
Boeing 747800,000 lb 362,870 kg180 mph 290 km/h 155 kts
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