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The 3X55 Trener (''Trainer'') and 3X47 Ultra are a family of ultralight civil aircraft produced in Poland by the 3Xtrim Aircraft Factory. Both are two-seat, high-wing, strut-braced monoplanes with fixed tricycle undercarriage and available only as completed aircraft. There are also 450 Ultra and 495 Ultra Plus sub-variants of the 3X47 Ultra, with gross weights adjusted for national ultralight regulations.〔Hunt, 2006, pages B-1 to B-3〕〔Bayerl, Robby; Martin Berkemeier; et al: ''World Directory of Leisure Aviation 2011–12'', page 12. WDLA UK, Lancaster UK, 2011. ISSN 1368-485X〕 The US light sport aircraft version of the 3X55 is known as the Navigator 600 and has a 1320 pound maximum gross takeoff weight 3Xtrim take their company name from a double entendre, as they refer to their designs being "triple trimmed" (or more exactly "triple-tested") during the design, prototype and production stages and also that the aircraft is designed for "extreme conditions". In English the company name is pronounced "Three-Extreme".〔 ==Development== Former SZD sailplane engineer Adam Kurbiel designed the predecessor of 3X55, the EOL-VLA, to conform to European JAR-VLA rules. That plane was modified through the years to meet Canadian Advanced Ultralight and US Light Sport Aircraft rules. The 3X47 version is specifically for the European market to meet those standards.〔 The designation 3X55 means "3Xtrim Aircraft – 550 kg gross weight" while the 3X47 refers to its 470 kg gross weight.〔 The European versions feature extensive structural use of carbon fibre to achieve lightness, while the 3X55 is predominantly of fibreglass construction. Otherwise the two aircraft are similar in appearance and performance.〔 The 3X55 first flew in 1996 and by the summer of 2006 about 60 aircraft of both types had been produced.〔 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「3Xtrim 3X55 Trener」の詳細全文を読む スポンサード リンク
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