Flaps extention effects on TBM930 pitch?

[Noel 4,503]

I ask this question because the TBM930 goes nose up initally and quite prominently, whereas it seems most all other planes go more nose down immediately, at least in my simming experience.   Is this 'normal' perhaps for this particular plane?  From an FAA document:

0. Flap extension has a definite effect on the airplane’s pitch behavior. The increased camber from flap deflection produces lift primarily on the rear portion of the wing, producing a nose-down force. This pitch behavior varies on different airplane designs. In general, though:

   • Flap deflection of up to 15° primarily produces lift with minimal drag. The airplane has a tendency to balloon up with initial flap deflection because of the lift increase. The nose down pitching moment, however, tends to offset the balloon.

   • Flap deflection beyond 15° produces a large increase in drag. In high-wing airplanes, a significant nose up pitching moment can occur because the resulting downwash increases the airflow over the horizontal tail.

Edited November 22, 2020 by Noel

[Glenn Fitzpatrick 3,798]

56 minutes ago, Noel said:

I ask this question because the TBM930 goes nose up initally and quite prominently, whereas it seems most all other planes go more nose down immediately, at least in my simming experience.   Is this 'normal' perhaps for this particular plane?  From an FAA document:

0. Flap extension has a definite effect on the airplane’s pitch behavior. The increased camber from flap deflection produces lift primarily on the rear portion of the wing, producing a nose-down force. This pitch behavior varies on different airplane designs. In general, though:

   • Flap deflection of up to 15° primarily produces lift with minimal drag. The airplane has a tendency to balloon up with initial flap deflection because of the lift increase. The nose down pitching moment, however, tends to offset the balloon.

   • Flap deflection beyond 15° produces a large increase in drag. In high-wing airplanes, a significant nose up pitching moment can occur because the resulting downwash increases the airflow over the horizontal tail.

Generally in most GA planes (mostly high wing)  I have flown,  if you hold the controls steady and add flap, you get an initial tendency to nose up accompanied by washing off some speed. if you then adjust the controls/attitude to get back your original previous speed you finish up slightly nose down (for the same airspeed) compared to before you added flap. 

The Cessna's in game behave that way as well. Trim for hands off straight and level and progressively add flap and the nose comes up and the airspeed washes off rapidly unless you adjust attitude/power .

In a real Cessna, it actually becomes a habit to nose down a touch and add some down trim every time you add flap on final to keep your airspeed constant.

 

No idea about the TBM though never flown one in real life. In fact the only low wing aircraft I have flown regularly were Piper Warriors which are not in the same class at all as the TBM.

Edited November 22, 2020 by Glenn Fitzpatrick

[sd_flyer 6,042]

I flown airplanes  both airplanes that  pitch up  and pitch down due to flap extension. I don't think it has to do with high or low wing design, but rather shift of center of pressure. Also what kind of flaps fowler, slotted, plain, split and etc may come in play as well.