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.
Modular design
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Modular design, or modularity in design, is a design principle that subdivides a system into smaller parts called modules, which can be independently created, modified, replaced, or exchanged with other modules or between different systems.
A laptop that is designed to be modular
The modular design of the Unimog offers attachment capabilities for various different implements.
Modular workstations
Modular computer design