Power-egg
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A power-egg is a complete "unitized" modular engine installation, consisting of engine and all ancillary equipment, which can be swapped between suitably designed equipment, with standardised quick-changing attachment points and connectors.
A BMW 801 Kraftei (power egg), being unloaded from a Gotha Go 242 transport glider. Russia, March 1943. Note the engine is already fitted with its cowling and cooling fan
A surviving Junkers Ju 88R-1 night fighter with Kraftei unitized-installation BMW 801 engines, RAF Museum London, 2007
The same aircraft with its engines removed, showing the bulkhead mounting points, 2016
A Merlin-powered, Beaufighter night fighter Mark II of No. 255 Squadron RAF at RAF Hibaldstow, September 1941, showing the Merlin Power Plants later used on the Lancaster.
Heinkel He 177 Greif
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The Heinkel He 177 Greif (Griffin) was a long-range heavy bomber flown by the Luftwaffe during World War II. The introduction of the He 177 to combat operations was significantly delayed, by both problems with the development of its engines and frequent changes to its intended role. Nevertheless, it was the only long-range, heavy bomber to become operational with the Luftwaffe during the war. The He 177 had a payload/range capability similar to that of four-engined heavy bombers used by the Allies in the European theatre.
A later DB 610 "power system" which equipped the He 177A-5. The DB 606A/B powerplants were similar in configuration, with outermost "pair" of engine mount forgings not shown.
Portside view of a DB 605 engine in a Bf 109G's nose - the visible engine mount forging was similar to what each side of the DB 606/610 used, along with the "power system's" special centreline mounting unit.
He 177A-5 tail gun position, with 20mm MG 151 cannon and bulged upper glazing for upright gunner's seating.