Boeing C-108 Flying Fortress
- "C-108" redirects here. For the freshwater catfish, see Corydoras xinguensis
|C-108 Flying Fortress|
|The XC-108 running up|
|Role||Military transport aircraft|
|Manufacturer||Boeing / Lockheed-Vega / Wright-Patterson AFB|
|Primary user||United States Army Air Forces|
|Developed from||B-17 Flying Fortress|
Design and development 
The first C-108 built (designated XC-108) was a B-17E (41-2593) converted to a V.I.P. transport for General Douglas MacArthur in 1943. With the exception of the nose and tail turrets, all armament was removed, as was all armor. The interior of the plane was made into a flying office for MacArthur, with extra windows, cooking facilities, and living space. To facilitate entry and exit, a drop-down door with steps was installed in the rear fuselage.
A similar conversion as in XC-108 was made on a B-17F-40-VE (42-6036).
Between August 1943 and March 1944, another B-17E (41-2595) was converted to a cargo aircraft and designated XC-108A. Hoping to convert obsolete bombers into cargo aircraft, the United States Army Air Forces initiated a remanufacturing station at Wright-Patterson Air Force Base. The plane was stripped of armament, armor, and other military equipment. Crew locations were shifted, and the nose was modified to provide space for cargo and/or personnel. The cockpit was accessed via the crawlway under it or through the hinged solid nose cone that had replaced the original glazed bombardier station. To increase cargo space, several bulkheads were removed and the bomb bay doors were sealed closed. This allowed much of the fuselage volume to be used to carry cargo or personnel.
A B-17F 42-30190 was converted (and given designation XC-108B) to tanker service. As in the XC-108A, it was devoid of armor and weapons, and the fuselage was modified to make space for its cargo. The fuselage was filled with fuel tanks.
Operational history 
Was personal VIP transport aircraft of General Douglas MacArthur in 1943.
Based in India, the XC-108A was used to fly material and personnel over the Himalayas to the B-29 base in Chengdu, China. Due to chronic engine difficulties, it proved an impractical cargo aircraft. In October 1944, it was returned to the United States. By the end of the war, it was disassembled and left in a junkyard in Maine. In 1985, a vintage airplane buff acquired the pieces, and they were transported to an airport in Illinois. The owner hopes to restore it to B-17E configuration.
XC-108B was to be used in the same line of work as the XC-108A: carrying material (in this case, fuel) over the Himalayas to the base in Chengdu.
- B-17E converted to VIP transport standard for General Douglas MacArthur.
- B-17F converted to VIP transport standard for General Douglas MacArthur.
- B-17E converted to cargo or troop transport standard.
- B-17F converted for service as a tanker.
Two other cargo transports and VIP transports were made from the B-17.
- Troop transport version capable of carrying up to 64 troops, 25 built.
- VIP transport version for high level staff officers, 8 built.
Specifications (XC-108) 
- Crew: 5
- Capacity: General Douglas MacArthur and staff
- Length: 74 ft 4 in (22.66 m)
- Wingspan: 103 ft 10 in (31.65 m)
- Height: 19 ft 1 in (5.82 m)
- Wing area: 1,527 sq ft (141.9 m2)
- Powerplant: 4 × Wright R-1820-65 9-cyl. turbo-charged air-cooled radial piston engines, 1,200 hp (890 kW) each
- Maximum speed: 261 kn; 483 km/h (300 mph)
- Guns: 4 × 0.5 in (13 mm) M2 Browning machine guns in nose and tail turret
- XC-108A, 41-2595, "Desert Rat", survived in a New England junkyard and is being restored in 2011 in McHenry County, Illinois, by a private individual to B-17E configuration. 
See also 
- Related development
- Aircraft of comparable role, configuration and era
- Related lists
- Jablonski, Edward. Flying Fortress. Doubleday, 1965. (ISBN 0-385-03855-0)
- Wagner, Ray. American Combat Planes. Doubleday, 1982. (ISBN 0-930083-17-2)
- Encyclopedia of American Aircraft
- USAF Museum