For Piper Classique, thank you.
Those thoughts are referred to a light SEP training a/c, like a C150/C152, I'm sorry about my "Itanglish" but difference between neglectable and negligeable is not very clear for me at the moment (I'll do some research now :-) ).
What I meant was that, passing from flap1 to flap2, pich changes are small and considered
that we are slow and descending with a nose down attitude, this changes are hardly
visualized and sensed by the pilot. So, once the pilot knows about the effects that flap
produce on that particular a/c (nose up or down moment), he will compensate for it
using the yoke (thanks again) but without acting on the trim. The pilot will rather
concentrate on mantaining the required speed and descent slope.
For Foxmoth
Well, the a/c is not really out of trim, the a/c is trimmed for a speed, lets say 75 kts on
downwind. On downwind the a/c is trimmed at that particular airspeed in order to
mantain level flight, so you can do all your stuff etc... yes, in downwind I need a nicely
trimmed airplane. When turning on base power is reduced, a/c will naturally put the nose
down looking for that 75 kts he wants, here the pilot stop the nose drop just by means
of the elevator in order to obtain a lower airspeed, lets say 70 kts.
The difference is just 5 kts, not very much out of trim. In this way, using a little muscle, the pilot will have immediately a better understanding on what is going on about lift and gravity, about energy balance while trading altitude for speed and, most important, load factor.
Thank you again for your comments