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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. In aircraft so designed the power-egg is typically removed before mean time to failure is reached and a fresh one installed, the removed engine then being sent for maintenance. Spare power-eggs may be stored in sealed containers, to be opened when needed. The power-egg or Kraftei format was used in some German Second World War era aircraft, particularly for twin or multi-engined airframe designs. It existed in two differing formats – the initial Motoranlage format which used some specialized added components depending on what airframe it was meant for use on, and the Triebwerksanlage format, a more complete unitization format usually including exhaust and oil cooling systems. (en)
- クラフティ（Kraftei、英語ではpower-egg）とは、第二次世界大戦期のドイツの航空機で用いられた設計上の特徴である。 (ja)
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- A surviving Junkers Ju 88R-1 night fighter with Kraftei unitized-installation BMW 801 engines, RAF Museum London, 2007 (en)
- The same aircraft with its engines removed, showing the bulkhead mounting points, 2016 (en)
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- Junkers Ju 88 360043 .jpg (en)
- Junkers Ju 88 RAF Hendon.jpg (en)
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- クラフティ（Kraftei、英語ではpower-egg）とは、第二次世界大戦期のドイツの航空機で用いられた設計上の特徴である。 (ja)
- 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. In aircraft so designed the power-egg is typically removed before mean time to failure is reached and a fresh one installed, the removed engine then being sent for maintenance. Spare power-eggs may be stored in sealed containers, to be opened when needed. (en)
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- クラフティ (航空) (ja)
- Power-egg (en)
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