Type: Glider Tug
Origin: Ernst Heinkel AG
Crew: 7-9
First Flight: N/A
Service Delivery: N/A
Final Delivery: N/A
Production: 2 prototypes, 10 production Z-1s

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Powerplant:
Model: Junkers Jumo 211F-2
Type: Liquid cooled inverted V-12
Number: Five       Horsepower: 1,350 hp

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Dimensions:
Wing span: 35.20m (115 ft. 6 in.)
Length: 16.4m (53 ft. 9½ in.)
Height: 4m (13 ft. 1½ in.)
Wing Surface Area: N/A

Weights:
Empty: 47,300 lb. (21500 kg)
Loaded: 62,900 lb. (28600 kg.)

Performance:
Maximum Speed:
  Unencumbered: 270 mph (435 kph)
  Towing one Me 321: 137 mph (220 kph)
  Towing two Go 242: 155 mph (250 kph)
Range: N/A
Service Ceiling: N/A

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Armament:
Various, depending on 'donor' aircraft. Usually up to about 8 weapons, mainly 7.7mm MGs, also 13mm MGs and perhaps a 20mm cannon.

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Variants:
He 111Z: Prototypes. 2 Built
He 111Z-1: Production version. 10 Built.
He 111Z-2: Proposed bomber version. None built.

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Additional Images:
Image 1 - Close up of engines.
Image 2 - 3-view.
Image 3 - Inflight.
Image 4 - With starter cart.

Sources:
Gunston, Bill & Wood, Tony - Hitler's Luftwaffe, 1977, Salamander Books Ltd., London
WikiPedia - Heinkel He 111
Brown, Eric, Captain - Wings Of The Luftwaffe, 1979, Airlife Publishing Ltd., Shrewsbury
The Complete Encyclodepia of World Aircraft, 1997, Barnes & Nobles Books, ISBN: 0 7607 0592 5