Waco CG-4

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The Waco CG-4A was the most widely used United States troop/cargo military glider of World War II. It was designated the CG-4A by the United States Army Air Forces,[1] and named Hadrian in British military service.

Designed by the Waco Aircraft Company, flight testing began in May 1942, and eventually more than 13,900 CG-4As were delivered.

Design and development

The CG-4A was constructed of fabric-covered wood and metal and was crewed by a pilot and copilot. It had two fixed mainwheels and a tailwheel.

The CG-4A could carry 13 troops and their equipment. Cargo loads could be a 1⁄4ton truck (i.e. a Jeep), a 75 mm howitzer, or a 1⁄4ton trailer, loaded through the upward-hinged nose section. C-47s were usually used as tow aircraft. A few C-46 tugs were used during and after Operation Plunder.

The USAAF CG-4A tow line was 11⁄16-inch-diameter (17 mm) nylon, 350 feet (107 m) long. The CG-4A pickup line was 15⁄16inch- (24 mm)-diameter nylon, but only 225 ft (69 m) long including the doubled loop.

In effort to identify areas where strategic materials could be reduced, a single XCG-4B was built at the Timm Aircraft Corporation using wood for the main structure.

[2]

Production

From 1942-1945, the Ford Motor Company's Kingsford plant built 4,190 Model CG-4A gliders for use in combat operations during World War II. The Kingsford plant built more CG-4A gliders than any other company in the nation at much less cost than other manufacturers. The primary builders of the Model CG-4A gliders were located in Troy, Ohio; Greenville, Michigan; Astoria, New York; Kansas City, Missouri; St. Paul, Minnesota; and Kingsford, Michigan.

The 16 companies that were prime contractors for manufacturing the CG-4A were:

The factories ran 24-hour shifts to build the gliders. One night-shift worker in the Wicks Aircraft Company factory in Kansas City wrote,

“ On one side of the huge bricked-in room is a fan running, on the other a cascade of water to keep the air from becoming too saturated with paint. The men man the paint sprayers covering the huge wings of the glider with the Khaki or Blue and finishing it off with that thrilling white star enclosed in a blue circle that is winging its way around the world for victory ...

The wings are first covered with a canvas fabric stretched on like wallpaper over plywood then every seam, hold, open place, closed place, and edge is taped down with the all adhesive dope that not only makes the wings airtight, but covers my hands, my slacks, my eyebrows, my hair, and my tools with a fast-drying coat that peels off like nail polish or rubs off with a thinner that burns like Hell.[8]

 ”

Operational history

During Operation Market-Garden, the 101st Airborne Division was reinforced with 12 gliders on 18 September 1944. Here, Waco gliders are lined up on an English airfield in preparation for the next lift to Holland.
German troops examine an abandoned Waco, Normandy, June 1944

Whiteman Air Force Base was originally activated on 6 August 1942 as Sedalia Glider Base. In November 1942 the installation became Sedalia Army Air Field and was assigned to the 12th Troop Carrier Command of the United States Army Air Forces. The field served as a training site for glider pilots and paratroopers. Assigned aircraft included the CG-4A glider, Curtiss C-46 Commando, and Douglas C-47 Skytrain. The C-46 was not used as a glider tug in combat, however, until Operation Plunder in March 1945.

CG-4As went into operation in July 1943 during the Allied invasion of Sicily. They participated in the American airborne landings in Normandy on 6 June 1944, and in other important airborne operations in Europe and in the China Burma India Theater. Although not the intention of the Army Air Forces, gliders were generally considered expendable by high-ranking European theater officers and combat personnel and were abandoned or destroyed after landing. While equipment and methods for extracting flyable gliders were developed and delivered to Europe, half of that equipment was rendered unavailable by certain higher-ranked officers.[citation needed] Despite this lack of support for the recovery system, several gliders were recovered from Normandy and even more from Operation Market Garden in the Netherlands and Wesel, Germany.

The CG-4A found favor where its small size was a benefit. The larger British Airspeed Horsa could carry more troopers (seating for 28 or a jeep or an anti-tank gun), and the British General Aircraft Hamilcar could carry a light tank, but the CG-4A could land in smaller spaces. In addition, by using a fairly simple grapple system, an in-flight C-47 equipped with a tail hook and rope braking drum could "pick up" a CG-4A waiting on the ground.[9] The system was used in the 1945 high-elevation rescue of the survivors of the Gremlin Special 1945 crash, in a mountain valley of New Guinea.[10]

The CG-4A was also used to send supplies to partisans in Yugoslavia.

After World War II ended, most of the remaining CG-4As were declared surplus and almost all were sold. Many were bought for the wood in the large shipping boxes. Others were bought for conversion to towed camping homes with the wing and tail end cut off and being towed by the rear section and others sold for hunting cabins and lake side vacation cabins.

The last known use of the CG-4A was in the early 1950s by the USAF with an Arctic detachment aiding scientific research. The CG-4As were used for getting personnel down to, and up from, floating ice floes, with the glider being towed out, released for landing, and then picked up later by the same type of aircraft, using the hook and line method developed during World War II. The only modification to the CG-4A was the fitting of wide skis in place of the landing gear for landing on the Arctic ice floes.[11]

Variants

The XPG-1 prototype
The XPG-2 prototype
XCG-4
Prototypes, two built, plus one stress test article
CG-4A
Main Production variant, survivors became G-4A in 1948, 13,903 built by 16 contractors
XCG-4B
One Timm-built CG-4A with a plywood structure
XPG-1
One CG-4A converted with two Franklin 6AC-298-N3 engines by Northwestern
XPG-2
One CG-4A converted with two 175 hp (130 kW) Ranger L-440-1 engines by Ridgefield
XPG-2A
Two articles: XPG-2 engines changed to 200 hp (150 kW) plus one CG-4A converted also with 200 hp (150 kW) engines
PG-2A
Production PG-2A with two 200 hp (150 kW) L-440-7s, redesignated G-2A in 1948, 10 built by Northwestern
XPG-2B
Cancelled variant with two R-775-9 engines
LRW-1
CG-4A transferred to the United States Navy (13 units)
G-2A
PG-2A re-designated in 1948
G-4A
CG-4A re-designated in 1948
G-4C
G-4A with different tow-bar, 35 conversions
Hadrian Mk.I
Royal Air Force designation for the CG-4A, 25 delivered
Hadrian Mk.II
Royal Air Force designation for the CG-4A with equipment changes

Operators

A British Hadrian
 Canada
 Czechoslovakia
  • Czechoslovakian Air Force operated 2 or 3 Wacos, designated NK-4
 United Kingdom
 United States

Surviving aircraft

Cockpit of CG-4A at the Silent Wings Museum
Cockpit of CG-4A at the Silent Wings Museum

Specifications (CG-4A)

Data from Tribute to the American Combat Glider Pilots of World War II and Pilot's Flight Operating Instructions for Army Model CG4A Glider (TO No. 09-40CA-1)[16]

General characteristics

  • Crew: two pilots
  • Capacity: 13 troops, or quarter-ton truck (Jeep) and 4 troopers, or 6 litters
  • Length: 48 ft 8 in (14.8 m)
  • Wingspan: 83 ft 8 in (25.5 m)
  • Height: 15 ft 4 in (4.7 m)
  • Wing area: 900 ft² (83.6 m²)
  • Empty weight: 3,900 lb (1,769 kg)
  • Loaded weight: 7,500 lb (3,402 kg)
  • Useful load:
    "Troop Carrier (2 crew & 13 passengers): 4197 lb";
    "Cargo Carrier - Jeep (2 crew, 4 passengers, 1 Jeep Car): 4197 lb"
    "Cargo Carrier - 75 MM howitzer (2 crew, 3 passengers, 1 Howitzer, 18 rounds ammunition): 4197 lb[17] ()
  • Max. takeoff weight: 7,500 lb (3,402 kg)
  • Max take off (Emergency Load): 9,000 lb (4,082 kg)

Performance

  • Never exceed speed: 150 mph IAS [N 1] (241 km/h)
  • Maximum speed: 150 mph CAS[N 2] (240 km/h CAS[18]) at 7,500 lb (3,400 kg) 128 mph CAS/135 mph IAS at 9,000 lb
  • Cruise speed: IAS 72.6 mph[N 3] (117 km/h[N 4])
  • Stall speed: 49 mph[N 5] (79 km/h[N 6]) with design load 7,500 lb (3,400 kg)
  • Wing loading: 8.33 lb/ft² (40.7 kg/m²
  • Rate of sink: About 400 ft/min (2 m/s) at tactical glide speed (IAS 60 mph, 96 km/h)
  • Landing run: 600-800 feet (180-244 m) for normal three-point landing; "Landing rolls of approximately 2,000 to 3,000 feet are to be expected at the higher emergency gross weights...")
Armament

none

See also

Related development
Aircraft of comparable role, configuration and era
Related lists

References

Notes

  1. ↑ "...due to the possibility that windshield panels may blow in and other failures may occur."
  2. ↑ IAS about 158 mph
  3. ↑ IAS about 85 mph
  4. ↑ IAS about 137 km/h
  5. ↑ about 60 mph IAS
  6. ↑ about 96 km/h IAS

Citations

  1. ↑ Fitzsimons 1978, p. 1199.
  2. ↑ http://www.menomineemuseum.com/glider.htm
  3. ↑ Diehl 2002, p. 81.
  4. ↑ Bednarek, Janet Rose Daly and Michael H. Bednarek. Dreams of Flight: General Aviation in the United States.
  5. ↑ Andrade 1979, p. 96.
  6. ↑ "Waco CG-4." Fiddler's Green/ Retrieved; 29 March 2012.
  7. ↑ "Waco CG-4/" niehorster.orbat.com. Retrieved; 29 March 2012.
  8. ↑ Raph, Jane Beasley. "My Aunt the Doper: "Gliding Gladys" in the War Factory." Phlepsinc.com. Retrieved: 29 March 2012.
  9. ↑ "Silent Partner of the Plane." Popular Science, February 1944, p. 98.
  10. ↑ "Glider rescue from New Guinea Shangril-la." The Sydney Morning Herald, 2 July 1945.
  11. ↑ "Ice Cube Airport." Popular Mechanics, September 1952, p. 137.
  12. ↑ "Waco CG-4." The Fighting Falcon Museum. Retrieved: 29 March 2012.
  13. ↑ Munson, J. "Sailplanes in Our Collection." The Soaring Museum. Retrieved: 29 March 2012.
  14. ↑ "CG-4A." Air Mobility Command Museum. Retrieved: 29 March 2012.
  15. ↑ "Waco CG-4." The Airborne Museum.Retrieved: 29 March 2012.
  16. ↑ Pilot's Flight Operating Instructions for Army Model CG4A Glider (TO No. 09-40CA-1).
  17. ↑ Erection and Maintenance Instructions CG-4A Glider (TO No. 09-40CA-2), 15 February 1943.
  18. ↑
    IAS about 254 km/h

Bibliography

  • AAF Manual No. 50-17, Pilot Training Manual for the CG-4A Glider. US Government, 1945, select pages available on Wikimedia Commons, Category:Waco CG-4.
  • AAF TO NO. 09-40CA-1, Pilot's Flight Operating Instructions for Army Model CG-4A Glider, British Model Hadrian.US Government, 1944, available on Wikimedia Commons, Category:Waco CG-4.
  • Andrade, John M. U.S. Military Aircraft Designations and Serials since 1909. Earl Shilton, Leister, UK: Midland Counties Publications, 1979. ISBN 0-904597-22-9.
  • Diehl, Alan E., PhD. Silent Knights: Blowing the Whistle on Military Accidents and Their Cover-ups. Dulles, Virginia: Brassey's, Inc., 2002. ISBN 1-57488-412-3.
  • Fitzsimons, Bernard, ed. "Waco CG-4A." Illustrated Encyclopedia of 20th Century Weapons and Warfare, Volume 11. London: Phoebus, 1978. ISBN 978-0-241-10864-2.

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