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Which plane had five engines and was two planes joined together?
Short answer
The Heinkel He 111Z Zwilling, a design that joined two He 111s together. The result was an aircraft with two fuselages and five engines, five Junkers Jumo 211F units producing 1,000 kW (1,300 hp) each. It was originally conceived to tow the Messerschmitt Me 321 glider. The crew numbered seven.

Two fuselages and five engines
The He 111Z Zwilling — "twin" in German — was a design that joined two He 111s together. The result was an aircraft with two fuselages and five engines. The powerplant consisted of five Junkers Jumo 211F engines producing 1,000 kW (1,300 hp) each. Total fuel capacity was 8,570 L (1,890 imp gal; 2,260 US gal). The crew numbered seven: the port fuselage carried the pilot, the first mechanic, the radio operator, and a gunner.
A glider tug
The design was originally conceived to tow the Messerschmitt Me 321 glider. It could tow a Gotha Go 242 or a Messerschmitt Me 321 Gigant for up to ten hours at cruising speed.
Trials, production, and losses
The aircraft were tested at Rechlin in 1941 and pilots rated them very highly. A batch of ten was produced, five of them built from existing H-6 airframes. One aircraft was caught by RAF fighters over France on March 14, 1944. Eight were shot down or destroyed on the ground in 1944.
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