Junkers Ju-21

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The Junkers Ju-21 (manufacturer designations T 21 and H 21) was a reconnaissance aircraft designed in Germany in the early 1920s and produced in the Soviet Union at the Junkers plant at Fili for use by the Soviet Air Force. It was an all-metal, parasol-wing monoplane of conventional configuration and fixed, tailskid undercarriage. The pilot and observer sat in tandem, open cockpits. Two prototypes were constructed at the Junkers factory in Dessau, the second with a wing of reduced area. Despite the fact that the prototypes were unable to attain the performance that had been specified by the Soviets, series production commenced at Fili in August 1923.

The production version differed from the prototypes in having a BMW IV engine in place of the BMW III originally fitted, and carried machine gun armament for both the pilot and observer. Sluggish performance led to a few examples being fitted with Junkers L2 and L5 engines, but these provided little improvement. With performance only marginally better than the World War I-vintage de Havilland DH-9A that it had been purchased to replace, the Ju-21 was itself soon replaced by newly-built DH-9As built under license as the Polikarpov R-1.

The type was also evaluated by the Reichswehr's clandestine training school at Lipetsk, but was rejected due to its poor performance and the Heinkel HD.17 purchased instead.

pecifications (first prototype)

aerospecs
ref=
met or eng?= met

crew=Two, pilot and observer
capacity=
length m=7.30
length ft=23
length in=11
span m=10.77
span ft=35
span in=4
swept m=
swept ft=
swept in=
rot number=
rot dia m=
rot dia ft=
rot dia in=
dia m=
dia ft=
dia in=
width m=
width ft=
width in=
height m=2.50
height ft=8
height in=2
wing area sqm=21.8
wing area sqft=234
swept area sqm=
swept area sqft=
rot area sqm=
rot area sqft=
volume m3=
volume ft3=
aspect ratio=
wing profile=
empty weight kg=830
empty weight lb=1,830
gross weight kg=990
gross weight lb=2,180
lift kg=
lift lb=

eng1 number=1
eng1 type=BMW IIIa
eng1 kw= 138
eng1 hp= 135
eng1 kn=
eng1 lbf=
eng1 kn-ab=
eng1 lbf-ab=
eng2 number=
eng2 type=
eng2 kw=
eng2 hp=
eng2 kn=
eng2 lbf=
eng2 kn-ab=
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max speed kmh=217
max speed mph=135
max speed mach=
cruise speed kmh=
cruise speed mph=
stall speed kmh=
stall speed mph=
range km=750
range miles=470
endurance h=
endurance min=
ceiling m=
ceiling ft=
g limits=
roll rate=
glide ratio=
climb rate ms=
climb rate ftmin=
sink rate ms=
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armament1=
armament2=
armament3=
armament4=
armament5=
armament6= aircontent
see also=
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References

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* [http://hugojunkers.pytalhost.com/ju_h21_a1.htm The Hugo Junkers Homepage]
* [http://www.airwar.ru/enc/other1/ju21.html Уголок неба]