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Diana Sailplanes Diana 2
The SZD-56 Diana is a 15 metre class glider originally designed by Bogumił Bereś at PZL-Bielsko. However, PZL Bielsko went bankrupt before it could be put into serial production. The rights to the design were taken over by a new entity, Diana Sailplanes, which developed the design further and called it the Diana 2. By 2011 the aircraft was being produced by Design Office Bogumil Beres. The glider first flew on 12 January 2005.〔Bayerl, Robby; Martin Berkemeier; et al: ''World Directory of Leisure Aviation 2011-12'', page 141. WDLA UK, Lancaster UK, 2011. ISSN 1368-485X〕
==Design and development==
The Diana is a single-seat high-performance 15-metre class sailplane. It is a mid-wing cantilever monoplane with a T-tail unit. It has an all composite carbon-aramid-epoxy structure. The wing has plate airbrakes protruding from the upper surface only with full-span flaperons. The Diana has a retractable main landing gear with a fixed tail wheel.
The Diana 2 features a number of structural innovations, including a spar-less wing. The wing had been designed by Krzysztof Kubrynski, Ph.D., using numerical flow simulation methods (computer programs of his design).〔(www.samolotypolskie.pl: Krzysztof Kubryński )〕 It uses a variable profile belonging to the KL-002 family.〔 For fuselage-wing interference minimization reasons, the wing is thinner at the root.〔("Skrzydło SZD-52-2 Diana 2" )〕 Also, the leading and trailing edges do not follow any straight lines, necessitating a production process that depends heavily on CNC technology. The new wing offers considerably better performance at high speeds and better immunity from surface contamination.〔 The glider also features an unusual side-stick control system to accommodate the pilot in its unusually narrow cockpit. As the maximum possible water ballast that can be carried in the wings is almost 60 kg (130 lb) heavier than the empty weight of the glider, the Diana 2 has a very large range of wing loadings, from 28 to 58 kg/m² (5.7 to 11.9 lb/ft²).〔(Diana Sailplanes: DIANA 2 ) - accessed 2008-08-26〕
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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