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The Larson D-1 was an agricultural
biplane A biplane is a fixed-wing aircraft with two main wings stacked one above the other. The first powered, controlled aeroplane to fly, the Wright Flyer, used a biplane wing arrangement, as did many aircraft in the early years of aviation. While ...
that was purpose-built to replace
Boeing Stearman The Stearman (Boeing) Model 75 is an American biplane formerly used as a military Trainer (aircraft), trainer aircraft, of which at least 10,626 were built in the United States during the 1930s and 1940s. Stearman Aircraft became a subsidiary o ...
cropdusters.


Development

In 1955, Merle Larson designed the D-1 with updated features to improve cropdusting compared to the popular Boeing Stearman in use at the time. The aircraft used only 25 percent of the number of parts as a Stearman.


Design

The biplane featured a steel tube fuselage, and aluminum covered wings. The fuselage was fabric covered only to behind the cockpit, leaving the rest of the tail structure exposed, preventing dust buildup in the tail. The aircraft had twin rudders mounted outboard of the spray trail. Each of these were all-moving with anti-servo tabs. Standard automotive wheels and tires were employed to reduce cost as low-cost
World War II World War II or the Second World War (1 September 1939 – 2 September 1945) was a World war, global conflict between two coalitions: the Allies of World War II, Allies and the Axis powers. World War II by country, Nearly all of the wo ...
surplus was becoming too old, and new aviation tires cost nearly five times as much.


Specifications (Larson D-1)


See also

*
American Airmotive NA-75 __NOTOC__ The American Airmotive NA-75 was an agricultural aircraft marketed in the United States in the 1960s, created by remanufacturing military surplus Boeing Stearman trainers. The aircraft were fitted with completely new, high-lift wings, ...
*
Grumman Ag Cat The Grumman G-164 Ag Cat is a single-engined biplane agricultural aircraft, developed by Grumman in the 1950s. Schweizer built 2628 under contract for Grumman between 1959 and 1979, including more than 400 G-164s, 1330 G-164As and 832 G-164Bs ...
* Lamson Air Tractor


References

{{reflist, refs= {{cite journal , last=Kohn , first=Leo J. , journal=Experimenter , title=The Latest In Agricultural Aircraft , date=November 1955 , volume=4 , number=11 , publisher=Experimental Aircraft Association {{cite magazine , last= , first= , date=June 1955 , title=Another Design for Aerial Applicators , magazine=Flight Magazine , publisher=Air Review Publishing Corp. , location=Dallas, TX , volume=17 , number=3 , pages=67, 88 , url=https://archive.org/details/sim_flight-operations_1955-06_43_6/page/67/mode/1up , access-date=May 19, 2025 {{cite book , title=Jane's All the World's Aircraft 1958-59 , editor1-last=Bridgman , editor1-first=Leonard , year=1958 , publisher=Jane's All the World's Aircraft Publishing Co. Ltd. , location=London, UK , pages=321–322, url=https://archive.org/details/janesallworldsai0000na/page/321/mode/1up , access-date=May 19, 2025 1950s United States agricultural aircraft Biplanes Single-engined tractor aircraft Aircraft first flown in 1955 Twin-tail aircraft Aircraft with fixed conventional landing gear