Blaicher B-38

Following the WOS-37, his development of the Czerwiński CW 5 bis, Michal Blaicher turned to a new design incorporating Fowler flaps. Construction began in the ZASPL workshops but moved when ZASPL became LWL, controlled by PWS, delaying its completion.[1] Its first flight was made either late in 1938[1] or in the spring of 1939 at Lwów-Skiłnów,[2] flown by Zbigniew Źabski. After some modifications it was ready for official testing in August 1939 but was destroyed in the German invasion the following month.[1][2]

B-38 in flight

The all-wood B-38 had a cantilever gull wing built around two spars and covered with stress-relieving plywood. The mass balanced ailerons were assisted by Flettner tab and, inboard of them, Fowler flaps filled the remaining 2/3 of the span.[1]

The glider's fuselage was a ply-covered, semi-monocoque structure of oval cross-section. Its single seat cockpit, which included blind flying instrumentation, was enclosed and had a long dorsal fairing behind it. At the rear the cantilever tailplane was mounted above the fuselage on the fin; like the ailerons the elevators were tab assisted. Fixed empennage surfaces were ply-covered and the control surfaces fabric-covered.[1][2]

A detachable, two-wheeled trolley was used for take-off and a sprung skid for landings.[1]

Data from J, Cynk (1971),[1] except where noted. Performance from samolotypolskie[2]

General characteristics

• Crew: One
• Length: 6.3 m (20 ft 8 in)
• Wingspan: 16.3 m (53 ft 6 in)
• Height: 1.25 m (4 ft 1 in) [2]
• Wing area: 13.4 m² (144 sq ft)
• Aspect ratio: 20
• Empty weight: 190 kg (419 lb)
• Gross weight: 275 kg (606 lb)

Performance

• Never exceed speed: 200 km/h (120 mph, 110 kn) in dive
• Maximum glide ratio: best 29 at 80 km/h (50 mph; 43 kn)
• Rate of sink: 0.7 m/s (140 ft/min) minimum at 70 km/h (43 mph; 38 kn), flaps up. With flaps down, 0.4 m/s (79 ft/min) at 40 km/h (25 mph; 22 kn).[1]
• Minimum speed:35 km/h (22 mph; 19 kn)