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PZL Bielsko SZD-55
The PZL Bielsko SZD-55 is a Standard Class sailplane produced by PZL Bielsko since 1988. It was built in direct competition with the Schempp-Hirth Discus. The SZD-55 is still in production with approximately 20 registered in the United States.
==Design and development==
The SZD-55 is built of fiberglass and has an elliptical wing. It has top surface Schempp-Hirth type airbrakes. It is a glider with pleasant handling 〔Polskie Szybowce 1945-2011 Problemy rozwoju - ISBN 978-83-932826-0-9〕 that is easy to assemble, due to automatic controls hookup. With an empty weight of about 215 kg, it is the lightest of the current standard class gliders and is known for its excellent climbing and thermalling characteristics.〔Polskie Szybowce 1945-2011 Problemy rozwoju - ISBN 978-83-932826-0-9〕 The SZD-55 has a fairly cambered wing-section and performs well at lower speeds, but with plenty of water ballast (it can take 200 liters) it can also keep up well at higher speeds.
Main designer of the SZD-55 was mgr Tadeusz Łabuć. Since the mid-eighties, the best glider in the standard class was undoubtedly the German standard Discus, whose excellent performance was attributed to its unusual triple trapeze wing shape. So it was logical to adopt a similar idea for use of this outline of the new construction: the elliptical contour of the wing leading edge. Documentation of the glider was developed in 1987 same as prototypes for factory numbers X-144 (SP-P501) and X-145 (SP-P502) and flew 15.08.1988 and 03.01.1989 by January Roman.
Despite enormous difficulties in obtaining advanced materials (carbon fabric, kevlar) and the need for glass-epoxy laminates, the manufacturer managed to create a glider with an unladen weight of just over 200 kg. Klaus Holighaus, one of the finest manufacturers of gliders (Nimbus and Discus family) stated that if using a fiberglass technology PZL Bielsko factory reached less weight than gliders constructed using carbon fiber and Kevlar that means that they developed a new technology.〔Polskie szybowce 1945-2011 - Problemy rozwoju - ISBN 978-83-932826-0-9〕 This technology was later improved upon during the design and building of the SZD-56 Diana.
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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