|Role||Large cargo transport|
|Developed from||Messerschmitt Me 323|
The ZSO 523 was a proposed 1940s large military transport designed by the Zeppelin company of Friedichshafen. . During the second world war Germany concentrated on building fighters and bombers and the production of support aircraft was transferred to occupied France. The project was abandoned when France was liberated in 1944.
With Messerschmitt concentrating on the design and build of combat aircraft the design of a larger transport/airliner based on the design of the large Messerschmitt Me 323 military transport was sub-contracted to Zeppelin. The aircraft was to be built in France by SNCASO. The ZSO 523 would be like the Me 323 a high-wing monoplane but was larger with both a front and rear loading ramp. Powered by six 1618 kW (2200 hp) Gnome-Rhône 18R engines it also had a six-wheel retractable main landing gear.
Data from 
- Crew: 4
- Length: 40.25 m ( ft in)
- Wingspan: 70 m ( ft in)
- Height: 11.25 m ( ft in)
- Wing area: 456 m2 ( ft2)
- Empty weight: 48200 kg ( lb)
- Gross weight: 95000 kg ( lb)
- Powerplant: 6 × Gnome-Rhône 18R, 1618 kW (2200 hp) each
- Maximum speed: 382 km/h ( mph)
- Range: 2200 km ( miles)
- Service ceiling: 6200 m ( ft)
- "Behind the Lines: A Zeppelin Design". 1944-06-08. p. 610.
- <templatestyles src="Module:Citation/CS1/styles.css"></templatestyles>"Zeppelin ZSO 523". Retrieved 2009-09-03.
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