Boeing C-108 Flying Fortress

"C-108" redirects here. For other uses, see C-108 (disambiguation).

C-108 Flying Fortress

The XC-108 running up
Role	Military transport aircraft
Manufacturer	Boeing / Lockheed-Vega / Wright-Patterson AFB
First flight	1943
Introduction	1943
Retired	1945
Primary user	United States Army Air Forces
Number built	4 conversions from B-17
Developed from	Boeing B-17 Flying Fortress

C-108 Flying Fortress was the designation of four United States B-17 Flying Fortress heavy bombers which were converted to transport aircraft during World War II.

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 was later made on a B-17F-40-VE (42-6036), which was redesignated YC-108.

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

Boeing XC-108.

The XC-108 was personal VIP transport aircraft of General Douglas MacArthur in 1943.

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, where it suffered from some parts being scrapped and others salvaged from the airframe. Since then it has been rescued and is under restoration back to B-17E configuration.^[1]

Variants

CB-17G at Patterson Field, Ohio on January 1, 1946.

XC-108: B-17E converted to VIP transport standard for General Douglas MacArthur.

YC-108: B-17F converted to VIP transport standard for General Douglas MacArthur.

XC-108A: B-17E converted to cargo or troop transport standard.

XC-108B: B-17F converted for service as a tanker.

Two other cargo transports and VIP transports were made from the B-17.

CB-17G: Troop transport version capable of carrying up to 64 troops, 25 built.

VB-17G: VIP transport version for high level staff officers, 8 built.

Operators

United States

United States Army Air Forces

Specifications (XC-108)

General characteristics

Crew: 5
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

Performance

Maximum speed: 261 kn; 483 km/h (300 mph)

Armament

Guns: 4 × 0.5 in (13 mm) M2 Browning machine guns in nose and tail turret

Survivors

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.^[2]

References

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

External links

Wikimedia Commons has media related to Boeing XC-108.

Boeing military aircraft

Fighters/attack aircraft:	PW-9/FB F2B F3B F4B XF6B P-29/XF7B XF8B P-12 P-26 818 F-15E F-22 AV-8B F-15SE F/A-18E/F EA-18G

Bombers	YB-9 XB-15 B-17 Y1B-20 B-29 XB-38 XB-39 YB-40 XB-44 B-47 B-50 B-52 B-54 XB-55 XB-56 XB-59 B-1

Piston-engined transports	C-73 C-75 C-97 C-98 C-108

Jet transports	C-135 C-137 CC-137 YC-14 C-17 C-22 VC-25 C-32 C-40

Tanker-transports	KB-29 KB-50 KC-97 KC-135 KC-137 KC-10 KC-46 KC-767

Trainers	PT-13 PT-17 PT-18 PT-27 XAT-15 T-43 T-45

Patrol and surveillance	XPB XPBB XP3B P-8 EC-135 EC-18 E-3 E-4 E-6 E-8 E-10 E-767 737 AEW&C

Reconnaissance	NC-135 OC-135B RC-135 WC-135

Drones/UAVs	CQM-121 MQ-18 X-50 ScanEagle

Experimental/prototypes	X-20 X-32 X-36 X-37 X-40 X-45/Phantom Ray X-50 X-51 X-53 YAL-1 Phantom Eye Bird of Prey

United States military transport aircraft designations, Army/Air Force and Tri-Service systems

Army/Air Force sequence (1925-1962)	C-1 C-2 C-3 C-4 C-5 C-6 C-7 C-8 C-9 C-10 C-11 C-12 C-13¹ C-14 C-15 C-16 C-17 C-18 C-19 C-20 C-21 C-22 C-23 C-24 C-25 C-26 C-27 C-28 C-29 C-30 C-31 C-32 C-33 C-34 C-35 C-36 C-37 C-38 C-39 C-40 C-41/A C-42 C-43 C-44 C-45 C-46 C-47/T C-48 C-49 C-50 C-51 C-52 C-53 C-54 C-55 C-56 C-57 C-58 C-59 C-60 C-61 C-62 C-63 C-64 C-65 C-66 C-67 C-68 C-69 C-70/A/B/C/D C-71 C-72 C-73 C-74 C-75 C-76 C-77/B-D C-78 C-79 C-80 C-81 C-82 C-83 C-84 C-85 C-86 C-87 C-88 C-89 C-90 C-91 C-92 C-93 C-94 C-95 C-96 C-97/KC-97 C-98 C-99 C-100 C-101 C-102 C-103 C-104 C-105 C-106 C-107 C-108 C-109 C-110 C-111 C-112 C-113 C-114 C-115 C-116 C-117 C-118 C-119 C-120 C-121/F C-122 C-123/A C-124 C-125 C-126 C-127 (I) C-127 (II) C-128 C-129 C-130/J C-131 C-132 C-133 C-134 C-135/KC-135 C-136 C-137 C-138¹ C-139¹ C-140 C-141 C-142

Tri-service sequence (1962-present)	C-1 C-2 C-3 C-4 C-5 C-6 C-7/B C-8 C-9 C-10 C-11 C-12 C-13¹ C-14 C-15 C-16¹ C-17 C-18 C-19 C-20A-D/F-H C-21 C-22 C-23 C-24 C-25 C-26 C-27/J C-28 C-29 C-30¹ C-31 C-32 C-33 C-34¹ C-35 C-36 C-37A/B C-38 C-39¹ C-40 C-41 C-42¹ C-43¹ C-44¹ C-45 C-46

Revived original sequence (2005-present)	C-143 C-144 C-145 C-146

Non-sequential designations	C-767 C-880

¹ Not assigned See also: AC-47 • AC-119 • AC-130 • DC-130 • EC-130 • HC-130 • KC-130 • LC-130 • MC-130 • WC-130 • CT-39 • CT-43

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