The Bekas, which first flew in 1968, was a development of an earlier, 1959, design of Stefan Brochocki, the BKB-1. The design of the Bekas 1-A had three main aims : a higher L/D (archieved by using a greater span and aspect ratio), easier ground handling and rigging and a flexible wing to study the effect of bending on stability and controllability. It has a fixed gear and trailing- edge control surfaces on the out-board portion of the wing which serve a dual role of elevator and aileron.
Construction was wood and plywood.
Wing span: 15m / 49.2ft
Wing area: 14.67sq.m / 158sq.ft
Empty Weight: 159kg / 350lb
Payload: 91kg / 200lb
Gross Weight: 159kg / 350lb
Wing Load: 17.04kg/sq.m / 3.48lb/sq.ft
Aspect ratio: 15.3
Airfoil: NACA 8-H-12
MinSink: 0.61 m/s / 2.0 fps / 1.18 kt
No. Built: 3