The Ford Trimotor (also called the "Tri-Motor", and nicknamed the "Tin Goose") is an American three-enginedtransport aircraft. Production started in 1925 by the companies of Henry Ford and ended on June 7, 1933. A total of 199 Ford Trimotors were made. It was designed for the civil aviation market, but also saw service with military units.
The Ford Trimotor was a development of previous designs by William Bushnell Stout, using structural principles copied from the work of Professor Hugo Junkers, the noted German all-metal aircraft design pioneer, and adapted to an airframe very similar to the Fokker F.VII - even using the same airfoil cross section at the wing root.
In the early 1920s, Henry Ford, along with a group of 19 other investors including his son Edsel, invested in the Stout Metal Airplane Company. Stout, a bold and imaginative salesman, sent a mimeographed form letter to leading manufacturers, blithely asking for $1,000 and adding: "For your one thousand dollars you will get one definite promise: You will never get your money back." Stout raised $20,000, including $1,000 each from Edsel and Henry Ford.
In 1925, Ford bought Stout and its aircraft designs. The single-engined Stout monoplane was turned into a trimotor, the Stout 3-AT with three Curtiss-Wrightair-cooled radial engines. After a prototype was built and test-flown with poor results, and a suspicious fire caused the complete destruction of all previous designs, the "4-AT" and "5-AT" emerged.
The Ford Trimotor using all-metal construction was not a revolutionary concept, but it was certainly more advanced than the standard construction techniques of the 1920s. The aircraft resembled the Fokker F.VII Trimotor (except for being all-metal which Henry Ford claimed made it "the safest airliner around"). Its fuselage and wings followed a design pioneered by Junkers during World War I with the Junkers J.I and used postwar in a series of airliners starting with the Junkers F.13 low-wing monoplane of 1920 of which a number were exported to the US, the Junkers K 16 high-wing airliner of 1921, and the Junkers G 24 trimotor of 1924. All of these were constructed of aluminum alloy, which was corrugated for added stiffness, although the resulting drag reduced its overall performance. So similar were the designs that Junkers sued and won when Ford attempted to export an aircraft to Europe. In 1930, Ford countersued in Prague, and despite the possibility of anti-German sentiment, was decisively defeated a second time, with the court finding that Ford had infringed upon Junkers' patents.
Although designed primarily for passenger use, the Trimotor could be easily adapted for hauling cargo, since its seats in the fuselage could be removed. To increase cargo capacity, one unusual feature was the provision of "drop-down" cargo holds below the lower inner wing sections of the 5-AT version.
The original (commercial production) 4-AT had three air-cooled Wright radial engines. It carried a crew of three: a pilot, a copilot, and a stewardess, as well as eight or nine passengers [N 1]. The later 5-AT had more powerful Pratt & Whitney engines. All models had an aluminum corrugated sheet-metal body and wings. Unlike many aircraft of this era, extending through World War II, its control surfaces (ailerons, elevators, and rudders) were not fabric-covered, but were also made of corrugated metal. As was common for the time, its rudder and elevators were actuated by metal cables that were strung along the external surface of the aircraft. Engine gauges were also mounted externally, on the engines, to be read by the pilot while looking through the aircraft windshield. Another interesting feature was the use of the hand-operated "Johnny brake."
Like Ford cars and tractors, these Ford aircraft were well designed, relatively inexpensive, and reliable (for the era). The combination of a metal structure and simple systems led to their reputation for ruggedness. Rudimentary service could be accomplished "in the field" with ground crews able to work on engines using scaffolding and platforms. To fly into otherwise-inaccessible sites, the Ford Trimotor could be fitted with skis or floats.
The rapid development of aircraft at this time (the vastly superior Boeing 247 first flew at start of 1933), along with the death of his personal pilot, Harry J. Brooks, on a test flight, led to Henry Ford's losing interest in aviation. While Ford did not make a profit on its aircraft business, Henry Ford's reputation lent credibility to the infant aviation and airline industries, and Ford helped introduce many aspects of the modern aviation infrastructure, including paved runways, passenger terminals, hangars, airmail, and radio navigation.[N 2]
In the late 1920s, the Ford Aircraft Division was reputedly the "largest manufacturer of commercial airplanes in the world." Alongside the Ford Trimotor, a new single-seat commuter aircraft, the Ford Flivver or "Sky Flivver" had been designed and flown in prototype form, but never entered series production. The Trimotor was not to be Ford's last venture in aircraft production. During World War II, the largest aircraft manufacturing plant in the world was built at the Willow Run, Michigan plant, where Ford produced thousands of B-24 Liberator bombers under license from Consolidated Aircraft.
William Stout left the Metal Airplane division of the Ford Motor Company in 1930. He continued to operate the Stout Engineering Laboratory, producing various aircraft. In 1954, Stout purchased the rights to the Ford Trimotor in an attempt to produce new examples. A new company formed from this effort brought back two modern examples of the trimotor aircraft, renamed the Stout Bushmaster 2000, but even with improvements that had been incorporated, performance was judged inferior to modern designs.
A total of 199 Ford Trimotors were built between 1926 and 1933, including 79 of the 4-AT variant, and 117 of the 5-AT variant, plus some experimental craft. Well over 100 airlines of the world flew the Ford Trimotor. From mid-1927, the type was also flown on executive transportation duties by several commercial nonairline operators, including oil and manufacturing companies.
The impact of the Ford Trimotor on commercial aviation was immediate, as the design represented a "quantum leap over other airliners." Within a few months of its introduction, Transcontinental Air Transport was created to provide coast-to-coast operation, capitalizing on the Trimotor's ability to provide reliable and, for the time, comfortable passenger service. While advertised as a transcontinental service, the airline had to rely on rail connections with a deluxe Pullman train that would be based in New York being the first part of the journey. Passengers then met a Trimotor in Port Columbus, Ohio, that would begin a hop across the continent ending at Waynoka, Oklahoma, where another train would take the passengers to Clovis, New Mexico, where the final journey would begin, again on a Trimotor, to end up at the Grand Central Air Terminal in Glendale, a few miles northeast of Los Angeles. This demanding trip would be available for only a year before Transcontinental was merged into a combine with Western Air Service.
Ford Trimotors were also used extensively by Pan American Airways, for its first international scheduled flights from Key West to Havana, Cuba, in 1927. Eventually, Pan American extended service from North America and Cuba into Central and South America in the late 1920s and early 1930s. One of Latin America's earliest airlines, Cubana de Aviación, was the first to use the Ford Trimotor in Latin America, starting in 1930, for its domestic services.
The heyday for Ford's transport was relatively brief, lasting only until 1933, when more modern airliners began to appear. Rather than completely disappearing, the Trimotors gained an enviable reputation for durability with Ford ads in 1929 proclaiming, "No Ford plane has yet worn out in service." First being relegated to second- and third-tier airlines, the Trimotors continued to fly into the 1960s, with numerous examples being converted into cargo transports to further lengthen their careers, and when World War II began, the commercial versions were soon modified for military applications.
Some of the significant flights made by the Ford Trimotor in this period greatly enhanced the reputation of the type for strength and reliability. One example was Ford 4-AT Trimotor serial number 10, built in 1927. It flew in the United States and Mexico under registration number C-1077, and for several years in Canada under registration G-CARC. It had many notable accomplishments; it was flown by Charles Lindbergh and Amelia Earhart, among many others. It made the first commercial flight from the United States to Mexico City, as well as the first commercial flight over the Canadian Rockies. After damage on landing in 1936, it was grounded and remained for decades at Carcross, Yukon. In 1956, the wreck was salvaged and preserved, and in the mid 1980s, Greg Herrick took over C-1077 and began restoring it. As of 2006, C-1077 is in flying condition again, restored to its December 1927 appearance.
Making headlines became a Trimotor trademark. On November 27 and 28, 1929, Commander Richard E. Byrd (navigator), chief pilot Bernt Balchen, and two other crewmen, the copilot and the photographer, made the first flight above the geographic South Pole in a Ford Trimotor that Byrd named the Floyd Bennett. This was one of three aircraft taken on this polar expedition, with the other two being named The Stars and Stripes and The Virginian, replacing the Fokker Trimotors that Byrd previously used.
A Ford Trimotor was used for the flight of Elm Farm Ollie, the first cow to fly in an aircraft and to be milked mid-flight.
Franklin Roosevelt also flew aboard a Ford Trimotor in 1932 during his presidential campaign in one of the first uses of an aircraft in an election, replacing the traditional "whistle stop" train trips.
The long-range capabilities of the Ford Trimotor were exploited in a search for the lost flyers of the Sigizmund Levanevsky trans-polar flight in 1937. Movie stunt flyer Jimmie Mattern flew a specially modified Lockheed Electra along with fellow movie flyer, Garland Lincoln, flying a stripped-down Trimotor donated by the president of Superior Oil Company. With 1,800 gallons of avgas and 450 gallons of oil in the modified cabin, the Trimotor was intended to act as a "tanker" for the expedition. The Electra was able to transfer fuel in the air from the Trimotor, through a hose cast out the 4-AT's door. With the first aerial refueling test successful, the pair of pilots set out for Fairbanks, landing first at Burwash Landing, Yukon Territory, Canada, on August 15, 1937, but the Trimotor ran out of fuel and crashed in inclement weather the following day. The Trimotor was abandoned on the tundra.
One of the major uses of the Trimotor after it was superseded as a passenger aircraft by more modern aircraft like the Boeing 247 (1933) or the Douglas DC-2 (1934), then DC-3, was the carrying of heavy freight to mining operations in jungles and mountains. The Trimotor was employed for decades in this role.
In 1942, during the Battle of Bataan, a Trimotor was used in evacuations. The aircraft would haul 24 people nearly 500 miles a trip, twice daily. The aircraft was eventually strafed and destroyed by Japanese aircraft. That same year, another 5-AT-C was used by the Royal Australian Air Force during the Kokoda Track campaign.
In postwar years, the Ford Trimotors continued in limited service with small, regional air carriers. One of the most famous was the Scenic Airways Ford Trimotor N414H which was used for 65 years as a sightseeing aircraft flying over the Grand Canyon. The aircraft is still in use as of late 2011, mainly for promotional and film work, though one Trimotor operator offers rides.
Pre-production prototype, powered by three 200-hp (150-kW) Wright J-4 Whirlwind radial piston engines, accommodation for two pilots and eight passengers; one built.
The original production version, similar to the Ford 4-AT prototype; 14 built.
Improved version, powered by three 220-hp (165-kW) Wright J-5 Whirlwind radial piston engines, accommodation for two pilots and 12 passengers; 39 built.
Similar to the Ford 4-AT-B, equipped with a 400-hp (300-kW) Pratt & Whitney Wasp radial piston engine, fitted in the nose of the aircraft; one built.
Three aircraft similar to the Ford 4-AT-B, each with different engines and minor modifications.
Similar to the Ford 4-AT-B, powered by three 300-hp (225-kW) Wright J-6-9 Whirlwind nine-cylinder radial piston engines; 24 built.
One aircraft similar to the Ford 4-AT-E.
Enlarged version, powered by three 420-hp (320-kW) Pratt & Whitney Wasp radial piston engines, accommodation for two pilots and 13 passengers, the wingspan was increased by 3ft 10in (1.17m); three built.
Similar to the Ford 5-AT-A, powered by 420-hp Pratt & Whitney Wasp C-1 or SC-1 radial piston engines, accommodation for two pilots and 15 passengers; 41 built.
Improved version, similar to the Ford 5-AT-A, accommodation for two pilots and 17 passengers; 51 built.
Seaplane version, fitted with Edo floats; one built.
Increased-weight version, powered by three 450-hp (340-kW) Pratt & Whitney Wasp SC radial piston engines. The wings were mounted 8in (20cm) higher, to increase cabin headroom, but otherwise similar to the Ford 5-AT-C; 20 built.
Seaplane version, fitted with Edo floats; one built.
Proposed version, the engines were relocated to the wing leading edges.
Similar to the Ford 5-AT-A, powered by three 300-hp Wright J-6-9 radial piston engines; three built.
Seaplane version, fitted with Edo floats; one built.
Redesignation of a single Ford 6-AT-A, equipped with a 420-hp Pratt & Whitney Wasp radial piston engine, fitted in the nose of the aircraft.
One Ford 5-AT-C converted into a single engine freight transport aircraft. Six different engines ranging from 575hp (429kW) to 700hp (520kW) were installed.
Redesignation of a single Ford 4-AT-B, fitted with three 300-hp Pratt & Whitney Wasp radial piston engines.
Redesignation of a single Ford 4-AT-E, fitted with three 225-hp Packard DR-980 diesel engines.
Redesignation of a single Ford 5-AT-D, fitted with two 300-hp Wright J-6-9 Whirlwind radial piston engines, and a 575-hp (430-kW) Wright Cyclone radial piston engine fitted in the nose of the aircraft.
On March 17, 1929, a Colonial Western Airways 4-AT-B Tri-Motor, NC7683, suffered a double engine failure during its initial climb after takeoff from Newark Airport in Newark, New Jersey. It failed to gain height and crashed into a railroad freight car loaded with sand, killing 14 of the 15 people on board the aircraft. At the time, it was the deadliest airplane accident in American history.
On April 21, 1929, a Maddux Air Lines 5-AT-B Tri-Motor, NC9636, collided with a United States Army Air Service (USAAS) Boeing PW-9D fighter, 28-037, over San Diego; all six on board both aircraft died. The pilot of the Boeing PW-9D was performing stunts and then attempted to pass in front of the airliner, but misjudged the speed of the Maddux aircraft and his aircraft struck the cockpit of the Ford Tri-Motor.
On January 19, 1930, a Maddux Air Lines 5-AT-C Tri-Motor, NC9689, operating as Flight 7, crashed near Oceanside, California due to adverse weather conditions, killing all 16 on board.
On June 24, 1935, a Tri-Motor 5-AT-B of SACO (Servicio Aéreo Colombiano), registered F-31, collided with a Tri-Motor of SCADTA (Sociedad Colombo-Alemana de Transportes Aéreos), registered C-31, at Olaya Herrera Airfield near Medellín, Colombia; of the 20 on board both aircraft, only three passengers survived. Among the dead was the tango singer Carlos Gardel.
C/N:10 tail number: N1077 (4-AT-B, September 1927) The "C-1077, G-CARC Niagara" Currently owned by: Greg Herrick's Yellowstone Aviation, Inc. It is the oldest flying Trimotor with C/N(Construction Number): 10. It is based at the Golden Wings Museum, near Minneapolis, Minnesota, USA. This aircraft featured in the 2009 film Amelia (a biopic of aviator Amelia Earhart).
C/N:42 tail number: N9610(Formerly N7684) (4-AT-B, September 1928) Currently owned by: Dee Winston. It is based in Lufkin, Texas, USA.
C/N:55 tail number: N9612 (4-AT-E, 1929) The "City of Richmond" Originally owned by: Mamer Flying Service, Spokane, WA. Currently owned by: Ron Pratte's Collectible Aircraft, LLC. It is based at Chandler Stellar Air Park in Chandler, Arizona, USA.
C/N:58 tail number: N8419 (5-AT-C, 1929) Originally owned by: Northwest Airlines. Currently owned by: Kalamazoo Aviation History Museum. It is based at The AIR ZOO in Kalamazoo, Michigan, USA. The airplane is a rebuild of several 5-AT aircraft, including the original, which served with five carriers before being purchased for use by the United States Forest Service between 1951 and 1959. The original crashed and burned on August 4, 1959, while landing at a remote strip in the Nez Perce National Forest, killing two smokejumpers.
C/N:38 tail number: N7584 (4-AT-B, January 1928) Originally owned by: Robertson Aircraft, St Louis. Currently owned by: Kermit Weeks. It was badly damaged in Florida by hurricane Andrew, in the fall of 1992. Currently Located: Vicksburg, Michigan, USA.
C/N:58 tail number: N9642 (4-AT-E, January 1929) Originally owned by: Mohawk Airways, NY. Currently owned by: Maurice Hovius' Hov-aire, Inc. Possible rebuild. Sale reported. Currently Located: Vicksburg, Michigan, USA.
C/N:62 tail number: N8400 (4-AT-E, January 1929) Originally owned by: Mohawk Airways, NY. Currently owned by: Maurice Hovius' Hov-aire, Inc. Possible rebuild. Currently Located: Vicksburg, Michigan, USA.
C/N:65 tail number: N8403 (4-AT-E, May 1929) (Not in FAA records) The "Ptarmigan II" Originally owned by: Mamer Flying Service. Currently owned by Alaska Aviation Heritage Museum. Possible restoration. As of February 10, 2005, currently Located at Golden Wings Museum near Minneapolis, Minnesota, USA.
From 1954 onwards, efforts have been made to produce a modernized version of the Trimotor as the Stout Bushmaster 2000. Saddled with financial, management and marketing problems, only two examples were initially built with a third fuselage never completed.
Specifications (Ford 4-AT-E Trimotor)
Data from Flight International 14 November 1930
Crew: 3 (pilot, co-pilot, flight attendant)
Capacity: 11 passengers
Length: 49ft 10in (15.19m)
Wingspan: 74ft 0in (22.56m)
Height: 11ft 9in (3.58m)
Cabin length: 16ft 3in (5m)
Cabin width (average): 4ft 6in (1m)
Cabin height (average): 6ft 0in (2m)
Cabin volume: 461cuft (13m3)
Empty weight: 6,500lb (2,948kg)
Gross weight: 10,130lb (4,595kg)
Fuel capacity: 231USgal (192impgal; 874l)
Oil capacity: 24USgal (20impgal; 91l)
Powerplant: 3 × Wright J-6-9 Whirlwind 9-cylinder air-cooled radial piston engines, 300hp (220kW) each for take-off
The Lockheed Vega is an American six-passenger high-wing monoplane airliner built by the Lockheed Corporation starting in 1927. It became famous for its use by a number of record-breaking pilots who were attracted to the rugged and very long-range design. Amelia Earhart became the first woman to fly solo across the Atlantic Ocean in one, and Wiley Post used his to prove the existence of the jet stream after having flown around the world twice.
The Curtiss Robin, introduced in 1928, was a high-wing monoplane built by the Curtiss-Robertson Airplane Manufacturing Company. The J-1 version was flown by Wrongway Corrigan who crossed the Atlantic after being refused permission.
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The Stinson Reliant is a popular single-engine four- to five-seat high-wing monoplane manufactured by the Stinson Aircraft Division of the Aviation Manufacturing Corporation of Wayne, Michigan.
William Bushnell Stout was a pioneering American inventor, engineer, developer and designer whose works in the automotive and aviation fields were groundbreaking. Known by the nickname "Bill", Stout designed an aircraft that eventually became the Ford Trimotor and was an executive at the Ford Motor Company.
The Fokker F.VII, also known as the Fokker Trimotor, was an airliner produced in the 1920s by the Dutch aircraft manufacturer Fokker, Fokker's American subsidiary Atlantic Aircraft Corporation, and other companies under licence.
The Cessna Airmaster, is a family of single-engined aircraft manufactured by the Cessna Aircraft Company. The Airmaster played an important role in the revitalization of Cessna in the 1930s after the crash of the aviation industry during the Great Depression.
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The Bach Air Yacht was a trimotor airliner produced in the United States in the 1920s. Typical of its day, it was a high-wing braced monoplane, with fixed tailwheel undercarriage. Unusual for airliners of the late 1920s, the Air Yachts were constructed almost entirely of wood with steel fittings, undercarriage, and struts. Different models were powered by varying combinations of Wright, Ryan-Siemens, Kinner, Comet, and Pratt & Whitney engines, a large engine in the nose of the aircraft, and two smaller "helpers" under the wings in nacelles supported by struts. As with so many aircraft companies of the late 1920s, the Bach Aircraft Company succumbed to the Great Depression, thus further development of the Air Yacht was abandoned after the 3-CT-9.
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↑ Up to 12 passengers could be accommodated in special configurations.
↑ Note: The 28-page booklet, The Amazing Story of America's Oldest Flying Airliner, describes the history of the Ford Trimotor 4-AT-10, C-1077, also known as G-CARC "Niagara". It also describes the restoration process and some general history of Ford's Trimotor, as well as his aviation enterprises.
↑ Note: The Ford Tri-Motor List is an enthusiast's register of existing Ford Trimotors, Bushmasters and Stinson Trimotors.
Wynne, H. Hugh. The Motion Picture Stunt Pilots and Hollywood's Classic Aviation Movies. Missoula, Montana: Pictorial Histories Publishing Co., 1987. ISBN0-933126-85-9.
Lee, John G. (Summer 2014). "Early Days of the Ford Trimotor: Recollections of a Participant". AAHS Journal. American Aviation Historical Society. 59 (52): 128–134.
Towle, Tom (Summer 2014). "Designing the Ford Trimotor". AAHS Journal. American Aviation Historical Society. 59 (52): 122–127.
Weiss, David A. The Saga of the Tin Goose: The Story of the Ford Trimotor. Brooklyn, New York: Cumberland Enterprises, Incorporated, 1996. ISBN0-9634299-2-2.
Litwak, Jerry: 'Skinning a Tin Goose ... the hard way'. Pages 251 and 252 of 'Air International' magazine, May, 1978 describe the rebuilding of Scenic Airway's Tin Goose 5AT, owned by John Seibold, after it groundlooped in Nevada on February 6, 1977. Per the article, it was supposedly ready to fly again by late 1978.