The Larson D-1 was an agricultural biplane that was purpose-built to replace Boeing Stearman cropdusters.

[1] 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 biplane featured a steel tube fuselage, and aluminum covered wings.

The aircraft had twin rudders mounted outboard of the spray trail.

[2] Data from Jane's All the World's Aircraft 1958-59[3]General characteristics Performance