I just had to check that my recollection is correct, and indeed, the D.VIIF is very controllable deep deep into the stall. With full power, I can control a descent with approx 30 degrees nose up attitude, and an airspeed so low that the anemometer doesn't register anything. It's difficult to judge the angle of descent, so I can't say if AoA is 35 degrees or 45 degrees, but it's probably in that range. It's steep enough to wreck the plane if you follow through all the way to the ground. You have to be very careful with the aileron in that region of flight, but careful adjustments with the rudder makes it remarkably controllable.

Hi,
yes the sketch is exagerrated in showing the plane hanging at some 80 degrees, while it must have been around 60 degrees in reality. Also please note that "Flight" is "a bit biased" as well, the tone is often underestimating, and belittling - so the drawing might be actually right but they would never admit it. They also find it "hard to believe" elsewhere, that Mathy indeed intentionally tried to bomb harbour installations, and not babies in a hospital.

The text from Fred Berg also says that the plane was trying to get "airborne stalled" from the ground, and that it was frightening to hover all over the place without being able to really control it. Seems it is indeed a powerful plane ..

From every report, the Rhinebeck demonstration and the test peformed in 1922 the Fokker was obviously able to hang at 60 degrees for a long time, without falling. Those texts with those i read in Zuerl have indeed convinced me. If reports of Entente pilots, reports from german pilots like Fieseler and others, a demonstration at Rhinebeck aerodrome, the test from 1922 and the report from Fred Berg do not convince you, i guess nothing will.


Edit @ Swingman: Do yo fly a real D.VII/Replica ??!
They recently built a 1:1 replica with an original D.IIIa"ue" Mercedes engine in the Netherlands, a friend at the "Aerodrome" told me about it

Greetings,
Catfish

@Catfish: No, I don't fly a real D.VII or a replica of one. I just checked in RoF. I wish I could fly one, but the few who own and operate these rare birds are a bit possessive about them ;-)

A WW1 engine is very different from a modern engine of similar power - the thrust available is much higher due to the huge diameter, and the relatively low inflow velocity for the same power.

Bear in mind that power:weight is not directly relevant - the important value is thrust:weight, which must indeed be 1:1 to indefinitely hover.

As a note, the Power:Weight of the 170hp DVII is .149 kW/kg, 185hp DVIIF is .163 kW/kg, modern helicopters range from .19 to 0.39 kW/kg, with most towards the lower end. While the disc loading of the Mercedes is higher than most helicopters, it is close to that of the V22.

I don't consider that the engine and airframe will support indefinite flight at these high attitudes and very low velocities, but the duration may be significant before the loss of speed &/or altitude forces a recovery, with reasonable control by rudder and elevator due to prop-wash, even though the ailerons are ineffective due to low speed.