Is there anybody here who has actually flown a Junkers with the "Doppelflügel" (Double Wing) aileron desgn? Like the Ju 52, T 29 or the Ju 86? It is a quite unique design with a fixed main wing and a smaller, moveable wing trailing the main wing which acts as flap and control surface. How efficient is it at low speed? Does it tend to reverse close to stall? Does it produce significant adverse yaw?
The Ju 52 has a relatively highly tapered wing and small ailerons, how forgiving is it close to stall?
There probably is a reason why this design disappeared post WWII.... And probably the end of Junkers is not the only one, as many other design features of german manufacturers were picked up by the aviation world.
Does anybody know the elevator trim system of the Ju 52? When hearing about the sudden dive, alaska air trim actuator failure comes to mind. First dive recovered, second dive fatal.
As BAZL does allow the Junkers to fly again, obviously they have ruled out technical failure already ?
When talking low density altitude, higher stall speed is only one aspect. What I found more remakable, especially in the mountains, is that the radius of any turn also increases significantly. You simply need more space to maneurve if the density altitude is high. Typically you do not notice this, but in the mountains it is a different story.
So you have 3 adverse factors: Higher stall speed, less engine power and less space to maneurve. Might be one too much...