Flaps behavior inverted?

[Nedum]

The Su27 Flaps working completely different to all other planes in DCS.

If I activate the flaps, the Su27 nose went down. If I retire the flaps, the nose wents up. Flaps are there to produce more lift. In DCS they break and reduce the lift. Landings and takeoffs without the flaps are much easier to handle.

Another strange thing is, that non of this "nose up/nose down" behavior is noticed from the autoflaps. So if there is a physical explanation, why act the autoflap like in all other planes and only the manual flaps work inverted?

Edited December 4, 2014 by Nedum

[Corvus]

The Su27 Flaps working completely different to all other planes in DCS.

If I activate the flaps, the Su27 nose went down. If I retire the flaps, the nose wents up. Flaps are there to produce more lift. In DCS they break and reduce the lift. Landings and takeoffs without the flaps are much easier to handle.

Another strange thing is, that non of this "nose up/nose down" behavior is noticed from the autoflaps. So if there is a physical explanation, why act the autoflap like in all other planes and only the manual flaps work inverted?

 

Maybe it has something to dowith CoG?

[lxvanwyk]

Nose down behavior on activation of flaps is correct (depending on trim and CoG).

[esb77]

If the flaps are to the rear of the plane's center of gravity, the additional lift they provide when deployed lifts the rear end of the plane, providing a moment that rotates the nose down.

 

For the automatic flap extension, the flap changes are not always from low deflection to maximum deflection, so the effect may not be as pronounced. The autoflaps also tend to be deployed when the pilot is making stick inputs great enough to compensate for the autoflap's pitch effects, so though the effect is there, you're much less likely to notice it.

 

On landing approach you're in a fairly stable state, and inputs are mostly small and gradual, so it doesn't take much of an effect on plane handling to be noticeable.

[srky]

Also, Nedum: flaps ARE there to produce lift BUT at lower speeds... you can't have that extra lift without drag so- at high speed, flaps act more like an airbrake.

[Robin_Hood]

The main thing I think is that more lift does not necessarily produce a nose-high tendency, which is what seems to be implied by the OP. esb77 explained well why the nose-down behaviour is consistent with flaps placed aft of the center of gravity.