The Chase XCG-18A and YC-122 Avitruc (known internally as the Chase MS.7) was a military transport aircraft designed by Chase Aircraft and produced in limited numbers in the United States in the late 1940s, initially as a glider, but definitively in powered form. The design was based on the CG-14 cargo glider but was substantially larger and featured all-metal construction. it was a high-wing cantilever monoplane of twin boom configuration. The fuselage was of rectangular cross-section and featured a loading ramp at its rear. The main undercarriage units were carried at the sides of the fuselage and were fixed, while the nosewheel was retractable. In its powered form, two radial engines were fitted in nacelles in the wings.
Design and development 
The USAAF's experiences with cargo gliders during World War II indicated a role for a similar aircraft in the post-war inventory, but one capable of carrying a substantially heavier load and with greater recoverability than the essentially expendable wartime wooden assault gliders. Chase's CG-14 was selected as a starting point, and in January 1947, the USAAF placed an order for an enlarged, metal version of this aircraft, initially designated XCG-14B but redesignated to XCG-18A to reflect the basically all-new nature of the aircraft. When the prototype flew that December, it was the world's first all-metal transport glider. One of the major improvements was the use of a thinner wing section which allowed high tow speeds and small aircraft like the P-47 fighter being able to tow it into the air and to its release point.
Operational history 
In March 1948, the service (now the USAF) ordered four more aircraft under the new designation XG-18A and a fifth to be fitted with engines as the YC-122. The air force eventually lost interest in purchasing assault gliders, but continued with the development of the powered variant, purchasing two more examples for evaluation as the YC-122A and redesignating the second of these as the YC-122B when the original Pratt & Whitney engines were swapped for Wright units. This aircraft would form the basis for the definitive service trials version, the YC-122C. Nine of these aircraft were ordered and although they performed well in evaluation (first at Sewart AFB, Tennessee, later at Ardmore AFB, Oklahoma), the USAF no longer saw a need for a small transport aircraft and cancelled the project. Despite the short-lived history of the aircraft, it was used extensively at Ardmore AFB. At least one pilot, Captain Phillip C. Gromley of the 16th Troop Carrier Squadron, 463rd Troop Carrier Wing, achieved 1000 hours piloting the plane by February, 1955. All aircraft were replaced by Fairchild C-123B Providers by July, 1955. The last YC-122C assault transport was flown to Tuscon, Arizona, August 30, 1955, for storage at Davis-Monthan AFB. Captain Gromely is recorded as making the final flight of a YC-122C to Tucson. The remaining machines served on in utility roles until 1957.
Following their retirement, the fuselage of one of the YC-122s was used in the construction of the Hiller X-18.
- Chase MS.7
- Company designation for the XCG-14B
- original designation for the XCG-18 (two built)
- XCG-14B re-designated
- revised glider version (4 built)
- prototype powered version, an XG-18A with Pratt & Whitney R-2000-11 engines (one built)
- refined version of the YC-122 (two built)
- YC-122A re-engined with Wright R-1820-101 engines (one converted)
- definitive service trials version (nine built)
Units using this aircraft 
Specifications (YC-122C) 
Data from Jane's Encyclopedia of Aviation
- Crew: Two pilots
- Capacity: 30 troops or 24 stretchers or cargo
- Length: 61 ft 8 in (18.8 m)
- Wingspan: 70 ft 10 in (21.6 m)
- Gross weight: 32,000 lb (14,515 kg)
- Powerplant: 2 × Wright R-1820-101 9-cyl air-cooled radial piston engine, 1,426 hp (1,063 kW) each
- Maximum speed: 220 mph; 191 kn (354 km/h)
- Range: 2,900 mi; 2,520 nmi (4,667 km)
See also 
- Related development
- Aircraft of comparable role, configuration and era
- Related lists
- Taylor, Michael J. H. Jane's Encyclopedia of Aviation. London: Studio Editions, 1989. ISBN 0-517-69186-8.
- World Aircraft Information Files, File 891 Sheet 26–27. London: Bright Star Publishing.