The SZD-13 Wampir (Szybowcowy Zakład Doświadczalny - Glider Experimental Works) was a single-seat tail-less glider designed and built in Poland from 1955.

Development

The SZD-13 Wampir was a development of the SZD-6X Nietoperz, using a NACA laminar flow aerofoil. Main designer was Irena Kaniewska. Wind tunnel tests on the prototype were not encouraging, so it was not flown, in favor of the more advanced SZD-20 Wampir II.

Specifications and predicted performance (SZD-13 Wampir)

Data from http://www.piotrp.de/SZYBOWCE/pszd13.htm

General characteristics

• Crew: 1
• Length: 3.64 m (11 ft 11 in)
• Wingspan: 15 m (49 ft 3 in)
• Wing area: 16 m² (172 sq ft)
• Aspect ratio: 14.1
• Airfoil: NACA laminar flow

Performance

• Maximum speed: 210 km/h (130 mph, 113 kn)
• Stall speed: 57 km/h (35 mph, 31 kn)
• Maximum glide ratio: 29.4 at 75.5 km/h (46.9 mph/40.8 kts)
• Rate of sink: 0.64 m/s (126 ft/min) at 63.5 km/h (39.5 mph/34.3 kts)