[rogerindr]

How strong is the wind behind the engines during takeoff? For example behind a boeing 747. What is the strength compared too, Hurricane, storm..
Thank's, Roger

[Old_Fart]

How strong is the wind behind the engines during takeoff? for example behind a boeing 747. What is the strength compared too, Hurricane, storm....?
Thank's, Roger

I've seen charts for other "heavies" (C-5). At 300 feet behind the aircraft, the winds can be 150 mph. I don't know what category hurricane that translates to.

[dayslug24]

Most 747's have GE CF6 turbofans, which produce up to 70,000 lbs. thrust PER engine.
Here's a link to their site, maybe they have more info.
GE - Aviation: CF6

[Flying Blue Eagle]

Rogerindr - I think that 150 mph is = to a F-2, :: THe larger the air craft is the wores it is .;; at the rotation point , comeing off the wing tips are small tornadoes. In flight ,you don't fly under because get caught in them , you are going to spin like a top, left wing over right wing. In flight you stay at least 500 ft. below and 5 miles behind. And watch out for the winds if the wind is from the left of your flight then stay to his direction of flight . Same on the runways. Be sure which way wind is from, watch for the rotation point, that is where they start, they can in no wind condition hang around up ti 10 minuts. ( If you get caught in one ,it will be amazing if you come out in one piece. GOOD DAY AND SAFE FLYING> ::: F.B.E.