Variants
- 307
- equipped with Wright Cyclone GR-1820-G102 engines with single speed supercharger; 5 crew.
- 307B
- equipped with Wright Cyclone GR-1820-G105A engines with two speed supercharger for improved high altitude performance; 7 crew.
- C-75
- Five Trans World 307Bs were pressed into service with the USAAF as military transports; the cabin pressurization was removed to save weight.
- 307B-1
- Following military service, the C-75s were overhauled and updated with B-17G wings and tailplane, four Wright Cyclone GR-1820-G606 engines, and B-29-type electronics.
Read more about this topic: Boeing 307
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