Tourist
You see this . . ?
"To give you positive yaw control on the ground until your rudder is effective and to stop the nose lifting prematurely with thrust on a tail heavy a/c"
Well, Touristy, that is why.
Plus all the `adhesion` posts + Another St. Ivian - these are all why.
I saw a video where they did not actually do this and I could not figure out why . . ?
You see when you have take off thrust? The nose wants to come up.
It will do this at a very slow speed. It will even do this with reversxers during the landing run, oh yes.
So, in order to stop this happening, we keep half down scale until 100kts then bring the Maltese cross thing, sidestick indicator to the artificial horizon at 100kts.
The affect of Elevator at this speed is . . .effective enough to keep the nose on the runway, whereas before it was not, but the thrust from the very powerful engines in the comparatively very light aircraft will get the nose up at very low speeds.
When we get to V-rotate speed it is just about flying anyway and the nose wheel does not want to be on the runway any more so blissfully we rotate smoothly (about 2 degrees a second ) so the nose wheel rises (under control of the elevator v the thrust) into the air and the aircraft lifts into the sky and flies off to Greece or Spain or Italy, Palma, Geneva, Turkey, Miami . . .
Last edited by Natstrackalpha; 10th Jan 2014 at 20:32.