Drgreen757 From United States of America, joined Sep 2001, 155 posts, RR: 0
Reply 1, posted (13 years 7 months 3 weeks 3 days 6 hours ago) and read 2632 times:
Most horizontal stab's are already set before you even get on the aircraft, and stay there all the way thru engine start and takeoff. Boeing 757 stab trim is usually set to 4 units of trim. And when it is moved, it will usually be small minute movements that would be hard to see anyway, especially with binoculars.
As for the L-1011, it has an all moving horizontal stab. When the pilots pull and push on the control yoke, the entire Stab moves. The entire surface serves as the elevators, and what would normally be the elevators are trim tabs that can be adjusted up and down.
Minuteman From United States of America, joined Aug 2000, 271 posts, RR: 0
Reply 3, posted (13 years 7 months 3 weeks 3 days 4 hours ago) and read 2608 times:
You're probably not going to see any appreciable movement.
In a typical situation, a horizontal stabilizer is going to trim from around 13 degrees deflected nose up to 2 or 3 degrees nose up alignment with the fuselage (usually, not sure what that works out to in Trim Units). The trimming will occur over the entire climb, so you're talking about a ten degree change in deflection over twenty or thirty minutes.