The BD-4 is a light general aviation aircraft marketed in the United States for homebuilding since 1968. It was the first home-built aircraft to be offered in kit form, and remains one of the world’s most popular home-builds with thousands of plans issued and hundreds of versions completed.
Jim Bede designed the BD-4, the first real “kitplane” in the world. The design was based on a high-wing cantilever monoplane of conventional design, able to be fitted either with tailwheel or tricycle undercarriage, as the builder chooses. The builder was also able to choose between building a two-seat or four-seat version. Bede wrote a 165-page BD-4 builder’s book, “Build Your Own Airplane”, that is still available today, that gives the amateur builder a good perspective on construction techniques.