The 39 ft (11.9 m) wing was swept, had a 9.5:1 aspect ratio and employed a NACA 8-H-12 airfoil.

The modifications included aerodynamic devices to improve aircraft control above the stalling angle.

[2] The sole BKB-1A was destroyed on 6 November 1971 near Arlington, Washington, when a pilot conducted unauthorized aerobatics in the aircraft, subjecting it to an estimated negative 30g during a high-speed inverted descent.

The National Transportation Safety Board cited as cause factors that the pilot misjudged the aircraft's speed and overstressed the airframe to failure.

[2][5] Data from Soaring[2] The World's Sailplanes:Die Segelflugzeuge der Welt:Les Planeurs du Monde Volume II[6]General characteristics Performance