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The Pioneering Kitplane

Building on the experience gained from the BD-1 and BD-2, American engineer Jim Bede designed a new light aircraft for amateur aviation: the BD-4. It became the world’s first true “kitplane,” making aircraft construction accessible to enthusiasts. The BD-4 was designed as a two- or four-seater high-wing aircraft, powered by an engine ranging from 100 to 150 horsepower.

This versatile aircraft could be equipped with either a conventional tailwheel landing gear or a tricycle landing gear configuration. Before its release, Jim Bede authored and published a 165-page book titled “Build Your Own Airplane,” providing assembly techniques easily understood even by novice aircraft builders.

From Design to Production

The first BD-4 prototype, registered N624BD, was publicly showcased at the EAA Airshow in 1968. Following its successful debut, the BD-4 entered serial production as kits, making it widely available. These kits were priced between $2,850 and $5,100, excluding the engine, offering an affordable path for amateur builders to own an aircraft.

Continuing Innovation

The BD-4 underwent significant modernization in 2007 with the installation of a new all-metal wing. This four-seat modification was designated the BD-4B. Additionally, the BD-4C model was released, featuring a new cockpit and a more powerful 300-horsepower engine. A new version, the BD-4LSA, was planned for release in 2009, featuring a Lycoming 0-233 engine, a fully glazed cockpit, modernized landing gear, and a new metal wing.

Technical Specifications

Modification	ВD-4B
Wingspan, m	7.80
Length, m	6.53
Height, m	2.21
Wing area, m2	9.51
Empty weight	450
Maximum takeoff weight	910
Engine type	1 Piston engine Lycoming 0-320
Power, hp	1 x 150
Maximum speed, km/h	377
Cruising speed, km/h	280
Practical range, km	1450
Rate of climb, m/min	384
Crew, crew members	1
Payload	up to 3 passengers