[1][2] The Bekas series was an attempt by Kasper to create an experimental tailless glider with a higher glide ratio, better ground handling and rigging, using a flexible wing to study the effects of wing flexing on stability and controllability in flight.
The wing uses a NACA 8-H-12 airfoil and has greater span and higher aspect ratio than the BKB-1 to achieve its goals.
[1][2] The design resulted in a high glide ratio for a 15 m (49.2 ft) wingspan of 45:1, along with a reasonably low sink rate of 2.0 feet per second.
One model 1-A was started by Al Wilson of Seattle, Washington and completed by Clifford Johnson of Minneapolis, Minnesota in 1972, which features a wider chord wing.
[2][4] Data from Sailplane Directory and Soaring[1][2]General characteristics Performance