PZL Bielsko SZD 56 Diana
The Diana sailplane, designed by Borgumil Beres, is a flapped single place high-performance sailplane 15-meter with a mid-height wing and a "T"-tail arrangement. It uses carbon and aramide fibers exclusively to achieve an impressively low weight for a competitive sailplane of this type. The unique "sparless" wings can hold 160 litres (42.25 gallons) of water ballast, with a scant 46 kg (101.4 lb) weight for each wing panel. The structure of the Diana is exceeds the strength requirements of the JAR-22 Utility Category. The control stick is mounted on the right hand side of the cockpit rather than in the more customary center position. This arrangement brings the instrument panel closer to pilot. The adjustable backrest and headrest combine with the in-flight adjustable pedals for pilot comfort.
The Diana has the capacity to carry up to 5.8 liters (1.5 gallons) of tail ballast to correct C.G. location. The ballast tanks are fitted with relief valves to relieve the pressure caused by ballast in a spin.
Glidepath control is provided by top-surface air brakes. Roll rate (45 degrees to 45 degrees) is approximately 3 sec.
Wing span: 15 m / 49.21 ft
Wing area: 8.16 sq.m / 87.84 sq.ft
Aspect ratio: 27.5
Empty Weight: 175 kg / 385.8 lb
Payload: 115 kg / 253.5 lb
Gross Weight: 410 kg / 904 lb
Wing Load: 50.3 kg/sq.m / 10.3 lb/sq.ft
Water Ballast: 160 kg / 353 lb
MinSink: 0.46 m/s / 1.51 ft/s / 0.89 kt