by 
Tomyboy
ANSWERS: 3
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Difficult to answer as this is stated. If the aircraft were totally stripped, carrying very little fuel, long enough runway and the right atmospheric conditions it would be possible, but not something a pilot would want to try just for the heck of it and would abort in any event. I'm sure the pilot would much rather have all four going.
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Assuming that it was a fully loaded Boeing 747-400 weighing appoximately 800,000lbs and taking off at an airport with good weather conditions. It CAN take off with only two engines, but certain aspects must be applied. You just need to have a longer runway and more power to the engines. If the 747 is using RollsRoyce RB-211-524G as the engines, it would have a total thrust of approx. 240,000lbs. With only two it would only have 120,000lbs.
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Normal procedures for aircraft to fly are that it can continue a takeoff of *one* engine fails at any point. A 747 loaded for a normal revenue flight would therefore not be expected to continue a takeoff with two engines out. However, a 747 can be operated on a ferry flight, with no freight or passengers, with only three engines working. This implies that the aircraft is capable of completing the takeoff if one of the three remaining engines fails i.e. that in the light state it can take off with only two engines.
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