ORIGINAL: countilaw
The LOWERING of ''flaberons'', flaps or Elevons will pitch the nose down. Not up. The LOWERING of the elevator will also pitch the nose DOWN.
EXAMPLE: Upon landing, the flaps are lowered and the added lift pitches the nose down. If lowering the flaps pitched the nose UP it would put the aircraft in a stall.
Frank
Sorry to burst your bubble however many rules have different answers. There are numerous airplanes that when flaps are deployed the machine pitches UP BIG TIME.
There are numerous fixes such as airplanes that have leading edge devices that deploy with flaps. When I checked out as an Instructor Pilot, USAF T-38, I was surprised at the amount of pitch-up when the flaps were lowered. One had to push the stick forward quickly and with "push" to hold the altitude until the thumb-button trim took over.
I have flown a number of flap equipped RC models that all nosed up with flap deployment.
When The flaps are deployed on a trimmed machine, said flaps NOT being in smaller increments, the chord line also moves down from wing LE to flap TE which is a super-short time frame acting as a fast change of AOA. The elevator or slab-H-stab, is acting as just that - a LOT of UP elevator in that instant.
I have flown airplanes that do have a system to provide for flaps down and auto trim with several different systems. Only ABSOLUTE is that there are NO ABSOLUTES for all cases.
