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747 Elevator Trim Setting

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can anyone tell me what the elevator trim should be set at prior to takeoff. I've tried it at 0 and the plane just takes a really long time to get off the ground and you can never lift up at Vrot. An elevator trim setting of 2.7 makes it really easy to get off the ground but its harder to control your climb because the plane just tends to pitch up too high. I know this is not pilot language but if anyone understands my quandry, can you please help me. Thanks in advance

2 Responses

Pro Member Chief Captain
CRJCapt Chief Captain

Anonymous wrote:

can anyone tell me what the elevator trim should be set at prior to takeoff. I've tried it at 0 and the plane just takes a really long time to get off the ground and you can never lift up at Vrot. An elevator trim setting of 2.7 makes it really easy to get off the ground but its harder to control your climb because the plane just tends to pitch up too high. I know this is not pilot language but if anyone understands my quandry, can you please help me. Thanks in advance

2.0 seems to work well. The trim effects the force on the controls not the time required to reach T/O speed. Don't for get to use 20 degrees of flaps and rotate to about 10 degrees initially(more as to help control speed) at about 171 KIAS. You will have to re-trim the aircraft as speed, attitude and altitude changes, the 2.0 is just the starting point. Before you get to 3000 ft., you'll be adjusting the trim(hand flying). A 747 fully loaded takes alot of runway.

Pro Member First Officer
lionlicker First Officer

Here are the settings for 5 degrees flaps T.O.

Heaviest 875000 lbs = Trim 1.5 degrees
" AutoPilot fpm ready at 2200

Midweight 663000 lbs = Trim 1.1 degrees
" A.P. fpm ready at 3200

Lightest 452000 lbs = Trim 0.8 degrees
" A.P. fpm ready at 4300

Interpolate between these figures for any weight at T.O.

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