A DUKW in use by American troops in France.
|Place of origin||United States|
|Manufacturer||Yellow/GMC Truck and Coach
|Specifications (Yellow, 1942)|
|Weight||13,600 lb (6,200 kg) empty|
|Length||31 ft (9.45 m)|
|Width||8 ft (2.44 m)|
|Height||8 ft 10 in (2.69 m) with top up
7 ft 1 in (2.16 m) minimum
|Ring mount for .50BMG fitted to 25% DUKWs|
|Engine||GMC Model 270
91 hp (68 kW)
|Payload capacity||5,000 lb (2,300 kg) or 24 troops|
|Suspension||Live axles on leaf springs|
|400 mi (640 km) on road|
|Speed||50 mph (80 km/h) on road,
6.4 mph (6 kn; 10 km/h) in water
The DUKW (colloquially known as Duck) is a six-wheel-drive amphibious modification of the 2½ ton CCKW trucks used by the U.S. military in World War II. Designed by a partnership under military auspices of Sparkman & Stephens and General Motors Corporation (GMC), the DUKW was used for the transportation of goods and troops over land and water. Excelling at approaching and crossing beaches in amphibious warfare attacks, it was intended only to last long enough to meet the demands of combat. Surviving DUKWs have since found popularity as tourist craft in marine environments.
The DUKW was designed by Rod Stephens, Jr. of Sparkman & Stephens, Inc. yacht designers, Dennis Puleston, a British deep-water sailor resident in the U.S., and Frank W. Speir, a Reserve Officers' Training Corps Lieutenant from the Massachusetts Institute of Technology. Developed by the National Defense Research Committee and the Office of Scientific Research and Development to solve the problem of resupply to units which had just performed an amphibious landing, it was initially rejected by the armed services. When a United States Coast Guard patrol craft ran aground on a sand bar near Provincetown, Massachusetts, an experimental DUKW happened to be in the area for a demonstration. Winds up to 60 knots (110 km/h), rain, and heavy surf prevented conventional craft from rescuing the seven stranded Coast Guardsmen, but the DUKW had no trouble, and military opposition to the DUKW melted. The DUKW later proved its seaworthiness by crossing the English Channel.
The final production design was perfected by a few engineers at Yellow Truck & Coach in Pontiac, Michigan. The vehicle was built by Yellow Truck and Coach Co. (GMC Truck and Coach Div. after 1943) at their Pontiac West Assembly Plant and Chevrolet Div. of General Motors Corp. at their St. Louis Truck Assembly Plant; 21,147 were manufactured before production ended in 1945.
- D, designed in 1942
- U, utility
- K, all-wheel drive
- W, dual rear axles 
The DUKW was built around the GMC AFKWX, a cab-over-engine (COE) version of the GMC CCKW six-wheel-drive military truck, with the addition of a watertight hull and a propeller. It was powered by a 269.5 cu in (4 l) GMC Model 270 straight-six engine. A five-speed overdrive transmission drove a transfer case for the propeller, then a two-speed transfer case to drive the axles. The propeller and front axle were selectable from their transfer case. A power take-off on the transmission drove the air-compressor and winch. It weighed 13,000 lb (5,900 kg) empty and operated at 50 miles per hour (80 km/h) on road and 5.5 knots (6.3 mph; 10.2 km/h) on water. It was 31 feet (9.45 m) long, 8 feet 3 inches (2.51 m) wide, 7 feet 2 inches (2.18 m) high with the folding-canvas top down and 8 feet 9 inches (2.67 m) high with the top up.
It was not an armored vehicle, being plated with sheet steel between 1/16 and 1/8 inches (1.6–3.2 mm) thick to minimize weight. A high-capacity bilge pump system kept it afloat if the thin hull was breached by holes up to 2 inches (51 mm) in diameter. One in four DUKWs mounted a .50-caliber Browning heavy machine gun on a ring mount.
The DUKW was the first vehicle to allow the driver to vary the tire pressure from inside the cab, an accomplishment of a Speir's device. The tires could be fully inflated for hard surfaces such as roads and less inflated for softer surfaces, especially beach sand. This added to great versatility as an amphibious vehicle. This feature is now standard on many military vehicles.
The windshields were provided by GM rival Libbey Glass (Ford).
World War II
The DUKW was supplied to the U.S. Army, U.S. Marine Corps and Allied forces, and 2,000 were supplied to Britain under the Lend-Lease program; 535 were acquired by Australian forces, and 586 were supplied to the Soviet Union, which built its own version, the BAV 485, after the war. DUKWs were initially sent to Guadalcanal in the Pacific Theater, but were used by an invasion force for the first time in the European theater, during the Sicilian invasion, Operation Husky, in the Mediterranean. They were used on the D-Day beaches of Normandy and in the Battle of the Scheldt, Operation Veritable, and Operation Plunder. Amphibious beachheads were thought to be highly vulnerable to early counterattack as the landing units would deplete their ammunition and the supply system would not yet be established. The principal use was to ferry supplies from ship to shore, and tasks such as transporting wounded combatants to hospital ships or operations in flooded (polder) landscape.
After the war
After World War II, reduced numbers were kept in service by the United States, Britain, France, and Australia, with many stored pending disposal. Australia transferred many to Citizens Military Force units.
The U.S. Army reactivated and deployed several hundred at the outbreak of the Korean War with the 1st Transportation Replacement Training Group providing crew training. DUKWs were used extensively to bring supplies ashore during the Battle of Pusan Perimeter and in the amphibious landings at Incheon.
Ex-U.S. Army DUKWs were transferred to the French military after World War II and were used by the Troupes de marine and naval commandos. Many were used for general utility duties in overseas territories. France deployed DUKWs to French Indochina during the First Indochina War. Some French DUKWs were given new hulls in the 1970s, with the last being retired in 1982.
Later military use
The Royal Marines used five of these vehicles for training at 11 (Amphibious Trials and Training) Squadron, 1 Assault Group Royal Marines at Instow, North Devon. Four were manufactured between 1943 and 1945. The fifth is a DUKW hull copy manufactured in 1993 with unused World War II-vintage running gear parts. In 1999, a refurbishment programme began to extend their service life to 2014. DUKWs were removed from service in 2012.
The DUKWs were used for safety, allowing all ranks to undertake training drills for boat work for the landing craft ranks, and drivers undertaking wading drills from the Landing Craft Utility.
Principal military users
- United States
- Australia – 535
- Canada – approximately 800
- Dominican Republic
- Soviet Union – 586
- United Kingdom – approximately 2,000
Many were used after WWII by civilian organizations such as the police, fire departments, and rescue units.
The Australian Army lent two DUKWs and crew to Australian National Antarctic Research Expeditions for a 1948 expedition to Macquarie Island. Australian DUKWs were used on Antarctic supply voyages until 1970. From 1945 to 1965, the Australian Commonwealth Lighthouse Service supply ship Cape York carried ex-Army DUKWs for supplying lighthouses on remote islands.
Several were used by abalone fishermen in San Luis Obispo County, California, to take their catch from the boats directly to market, combining the two steps of off-loading onto smaller craft and transferring to trucks once they reached the beach.
One of the last DUKWs manufactured in 1945 was lent to a fire department during the Great Flood of 1993, and in 2005, Duck Riders of Grapevine, Texas, deployed the vehicle to help in the aftermath of Hurricane Katrina. The DUKW maneuvered through flood waters, transporting victims stranded on their rooftops to helicopter pads throughout New Orleans.
In the latter 1940s and throughout the 1950s, while Speir, now project engineer for the Army's Amphibious Warfare Program, worked on "bigger and better" amphibious vehicles such as the "Super Duck", the "Drake", and the mammoth BARC (Barge, Amphibious, Resupply, Cargo), many DUKWs were made surplus and used as rescue vehicles by fire departments and Coast Guard stations.
In 1952, the Soviet Union produced the BAV 485 derivative, adding a rear loading ramp. The Zavod imeni Stalina factory built it on the structure of its ZiS-151 truck, and production continued until 1962, with over 2,000 units delivered.
DUKWs are still in use as tourist transport in harbor and river cities across the globe. The first "duck tour" company was started in 1946 by Mel Flath in Wisconsin Dells, Wisconsin. The company is still in operation under the name Original Wisconsin Ducks.
- Ford GPA and GAZ 46 – 4 wheel amphibious jeeps
- Terrapin (amphibious vehicle) – a contemporary British equivalent vehicle
- Su-Ki – a contemporary Japanese equivalent vehicle
- Landing Vehicle Tracked – tracked supply and combat amphibious vehicle
- List of U.S. military vehicles by supply catalog designation
- "DUKW". US Army Transportation Museum. Archived from the original on 2008-07-25.
- Bishop, Chris (2002). The Encyclopedia of Weapons of WWII. Sterling Publishing Company. p. 67. ISBN 1-58663-762-2. Retrieved 2010-03-24.
- Doyle, David (2003). Standard catalog of U.S. Military Vehicles. Kraus Publications. p. 121. ISBN 0-87349-508-X.
- TM 9-802 2 1⁄2 ton Amphibian Truck, 6x6, GMC DUKW-353. US War Dept. 1943. pp. 8–9. Retrieved 24 Oct 2016.
- "Miami Shipbuilding Corporation". Foils.org. Retrieved 2013-12-27.
- Doyle (2003), pp. 119.
- Whitlock (2004).
- Michigan manufacturer and financial record. 73. Manufacturer Publishing Co. 1944. p. 104.
- Clarke, Donald (1978). How it works: the illustrated encyclopedia of science and technology. 1. Marshall Cavendish. p. 96.
- Skaarup, Harold A. (2011). Ironsides: Canadian Armoured Fighting Vehicle Museums and Monuments. iUniverse. p. 109. ISBN 1462034640.
- TM 9-802 (1942), pp. 3, 8.
- Friedman, Norman (2002). U.S. amphibious ships and craft: an illustrated design history. Illustrated Design Histories. Naval Institute Press. p. 218. ISBN 1-55750-250-1. Retrieved March 22, 2010.
- Fitzsimons, Bernard, general editor. The Illustrated Encyclopedia of 20th Century Weapons and Warfare (London: Phoebus, 1978), Vol. 8, p.802, "DUKW".
- TM 9-802 (1942), pp. 8, 24, 35.
- Ware, Pat (2014). The Illustrated Guide to Military Vehicles. Hermes House. pp. 105, 114, 179, 244. ISBN 978-1-78214-192-1.
- "Battle Stations II: The 'Duck'". Channel 4.
- "Remember when ... we sent amphibious trucks to the Antarctic?". Defence Materiel Organisation. November 2006. Archived from the original on 2008-12-01. Retrieved 2008-10-13.
- "UK DUKWS Refurbished for Royal Marines, Upgrade Update". Jane's International Defence Review. Jane's Information Group. 30 July 1999. Retrieved 31 August 2012.
- Johnson, Erika (2006), Cape Rochon – An Island Light, 9 (2), Lighthouses of Australia Bulletin
- "Orstverband Gemersheim". Thw-germersheim.de. Retrieved 2013-12-27.
- "Timeline". Original Wisconsin Ducks. Retrieved 2014-01-15.
- TM 9-1802A Ordnance Maintenance Power Plant for 2½-Ton Truck 6 x 6 (GMC). United States Department of War. July 1943.
- TM 9-1802B Ordnance Maintenance Power Plant for 2½-Ton Amphibian Truck, 6 x 6 (GMC DUKW-353). United States Department of War. November 1943.
- TM 9-1802C Ordnance Maintenance Hull and Water Drive for 2½-Ton 6 x 6 Amphibian Truck, (GMC DUKW-353). United States Department of War. December 1943.
- TM 9-2800 Military Vehicles. US Dept. of the Army. 27 Oct 1947. p. 321. Retrieved 24 Oct 2016.
- Technical Manuals[clarification needed]
- TM 9-1825A
- TM 9-1826C
- TM 9-1827B
- TM 9-1827C
- TM 9-1828A
- TM 9-1829A
|Wikimedia Commons has media related to DUKW.|
- U.S. Army Transportation Museum DUKW page, with photos
- Marine Corps DUKWs in World War II
- Sparkman & Stephens : the company at which Rod Stephens, Jr., one of the DUKW's designer, worked (see also this photo with explanatory caption, on the S&S site)
- Lace and DUKWs ... both part of the Speir Family legacy, several photos, statistics, and a few details of Speir's tire inflation system from his son Dean Speir
- DUKW: its operation and uses.