An unusual adaptation of the BD-5, the
Acapella 100, appeared in the early 1980s. Designer Carl D. Barlow of Option Air Reno mated a BD-5 fuselage with a distinctive twin-boom empennage and fitted it with a 100 hp
Continental O-200 engine. Later, a 200 hp
Lycoming IO-360 was fitted, and the wings shortened from 26.5 feet to 19.5 feet, becoming the
Acapella 200-S model. The prototype of this aircraft was first flown on June 6, 1980, with pilot Bill Skiliar at the controls. Unfortunately, it flew poorly and was difficult to control. Only the one prototype was built and it was donated to the
Experimental Aircraft Association's
Airventure Museum in
Oshkosh, Wisconsin, USA, where it is occasionally placed on display