180 mph
The lift off speed is dependant upon the weight of the aircraft. The heavier the aircraft the higher the speed. At maximum take off weight of 875,000 lbs (396,890 kgs) Vr (rotation speed) will be about 175 knots and V2 about 185 knots.
Assume you want V2 speed. Set flaps 10. This should give you V1 of about 120 knots. Rotate at 140 knots and climb out at 148 knots.
A Boeing 747 typically requires a ground speed of around 180-200 knots (207-230 mph) for liftoff. This speed varies depending on factors such as aircraft weight, weather conditions, and runway length.
The weight of a Boeing 747 can vary depending on its model and configuration, but it typically ranges from 160,000 kg to 440,000 kg when empty.
This information should be available on the Boeing website or other avaition-related websites. For a quick answer, I will related my experiences from 1970's. Boeing certified the B747-200 to operate with General Electric CF6-50 engines. During take-off power, each GE engine could produce 56,000 lbs of thrust per enginer: or 224,000 lbs for a few minutes. Now, the larger B747-400 a/c have more powerful engines. Currently each engine on a Boeing 747-400 can generate a maximum of about 63,300 lbs of thrust. Accordingly, since this aircraft has four engines it can produce total thrust of about 253,000 lbs.
The Maximum Take-Off Weight for a Boeing 747-100 is 333, 390kg; a Boeing 747-200 and 747-300 is 377,842kg; a Boeing 747-400 is 396,890kg; a Boeing 747-400ER is 412,775kg and the Boeing 747-8I is 442,253kg.
The maximum take-off weight of a Boeing 747-400 is 875,000 lbs
The lift off speed is dependant upon the weight of the aircraft. The heavier the aircraft the higher the speed. At maximum take off weight of 875,000 lbs (396,890 kgs) Vr (rotation speed) will be about 175 knots and V2 about 185 knots.
The Boeing 747's takeoff speed if 156knts or 180mph.Take off speed for 747-400 fully loaded is 155-160 knots or almost 300 km/h or 180 mph. About the speed of of an F1 racer down a long straight.The standard speed for a Boeing 747 to take off is at about 120 miles per hour.Take off speed for 747-400 fully loaded is 155-160 knots or almost 300 km/h or 180 mph. About the speed of of an F1 racer down a long straight.
The maximum take-off weight of a Boeing 747-400 is 875,000 lbs
This can vary depending on weather and weight, but can be between 180-210 knots
The maximum take off weight for a 747-400 is 875,000 pounds (396,890 kg.).
From a Boeing 747 Shuttle Carrying Aircraft (SCA).
377,842 kg.
The maximum take off weight of a 747-400 is 875,000 lbs or 396,890 kg.
The latest 747 models weigh over 480 tons at take-off.
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