Originally posted by hitech
You might wish to do some studding on this statement, because you are incorrect.
HiTech
Hi,
actually i made researches.
According to my datas the full extracted flaps decrease the turnrate and rolling manouvers with full flaps close above stall speed result in a very big barrel roll with plenty of altitude lost, not so in AH.
According to my datas, flaps tend to decrease the max AOA, they shift the speed of max lift to a slower speed, for the price of MUCH drag. In most cases also the cog get shifted, so the plane get nose or tail heavy. Full extracted Flaps in general have a very bad airfoil with much drag as result , which in general dont cover the whole wing.
Often the stall speed with full extracted flaps is higher than with only a bit extracted flaps!!
This is the reult of full extracted flaps:
-less good climb
-higher sink rate
-more steep glidepath
-smaler min speed(stall speed)
-higher stall risk
-at higher speeds or a while enabling full power, often turbolences behind the flaps, which reach the tail wing and suck it down, have a nose up movement as result(this isnt caused by more lift!!).
Since already around 5° extracted flaps gain 90% of the speed reduction(with 5° flaps the min stall speed is almost reached), extracting to a higher angle mainly cause drag and change the AoA to provide a better sight.
Afaik wrong in AH is:
1. full flaps have to much lift as result.
2. the handling with full flaps is much to good.
3. the turnrate is to good.
The manouver flap setting should be the most effective flap setting while sustained turns with flaps(best turnrate), without flaps the turnrate, same like the sink rate should be the best!!
The manouver flap setting of the Fowler flaps should probably provide a better turnrate, while a sistained turn, than without flaps.
Also for flaps count: Double lift = 4 x drag!! (fowler flaps are a exception).
As result the turrate have to go down!
Greetings,
Knegel
