Understanding Flaps... Up or down Elevator needed?

[adriantan]

Hi am trying to understand a little more about FLAP settings. I have read from many sources (e.g. http://www.fly-imaa.org/imaa/hfarticles/flying/v8-4-18.html) that when you put the flaps down, you will need to feed in down elevator to keep the nose of the plane from balooning up.

The above would seem true. However when I tried it on my GWS MUSTANG, I had to put UP Elevator instead of DOWN Elevator mixing. A DOWN elevator mix will make the plane dive towards the ground.

Why is this happening? Why does the mustang behave differently from other planes in this setting? The only thing I can think of is that the wings were never designed to have flaps on them and putting down the flaps actually acts like spoilers and cuts off lift which is why up elevator is needed. But why does this happen? Wing design?

[kamikaze]

Adrian,

Correct me if i wrong, i have put flap system in my cosair. same as you put flap on down position, and i need to set my elevator to up position a bit, it depand on you flap also, if you put flap down more than you have to increase the up elevator too. I have ask many SIFU that you MUST set up elevator when flap.  But pls dont put too much down flap, it become air brake. Normal flap will be 35 degree. 

Calvin

[adriantan]

I think what you say about too much flaps is true. Perhaps that's why up elevator is needed ? When you put too much flap, it already breaks lift and so you need up elevator. Else normally.. when you put down your flaps (thus more lift), the plane should lift nose high which is why you need a little down elevator to counter. Is that right?

Adrian,

Correct me if i wrong, i have put flap system in my cosair. same as you put flap on down position, and i need to set my elevator to up position a bit, it depand on you flap also, if you put flap down more than you have to increase the up elevator too. I have ask many SIFU that you MUST set up elevator when flap.  But pls dont put too much down flap, it become air brake. Normal flap will be 35 degree. 

Calvin

[kamikaze]

still after setting need to test out, if not we wont know, but all my flap system with up Elevator