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The Wassmer WA 20 Javelot ((英語:Javelin)) and its very similar successors the WA 21 Javelot II and WA 22 Super Javelot are single seat gliders built in France in the 1950s and 1960s. Well over a hundred were sold as club aircraft and over fifty remain on the French civil register in 2010. ==Design and development== The Javelot was designed by Maurice Collard to provide a simply constructed glider with good performance to replace pre-war German- designed aircraft like the DFS Weihe and French built DFS Olympia Meise (Nord 2000), as well as the first post war generation of French designs such as the Arsenal Air 100, then widely used by French clubs. The original WA 20 Javelot, later known as the Javelot I and first flown in August 1956, has an all wood wing of 16.08 m (52 ft 9 in) span and a wing area of 15.5 m² (199.6 sq ft) giving it an aspect ratio of 16.7. It is shoulder mounted and is in two pieces built around single box spars with leading edge D-shaped, plywood skinned torsion boxes. The wing is fabric covered aft of the spar. There are small endplates at the wing tips, partly to protect them on the ground. The airbrakes deploy both above and below the wing.〔 The Javelot has a flat-sided, polygonal fuselage, shaped by a steel tube frame and with fabric covering. Forward of the wing there are four longerons and the fuselage is deep and flat sided, which together with a deep, flat topped and sided canopy, which curves in side view, forms a blunt nose. The undercarriage is a combination of rubber sprung nose skid and fixed monowheel. Behind the wing the fuselage has only three longerons, tapers and has a prominent dorsal ridge. The wooden fin and rudder have straight edges and a rounded top; the tailplane, which carries a one piece elevator is mounted on top of the fuselage. There is a tailskid.〔< A revised, Standard competition class version, the WA 21 Javelot II made its first flight on 25 March 1958. This has a modified wing with a span of 15 m (49 ft 3 in) and 4° of dihedral on the outer parts though none on the constant chord centre section. The Javelot II also introduced separated pairs of differential ailerons as well as altering the wing to fuselage connection. By mid-1960, 50 Javelots had been delivered.〔 The final production variant, though one that continued to be improved, was the WA 22 Super Javelot, which first flew in June 1961. Initially this combined the wing of the Javelot II with a fuselage built around the same steel tube structure but now with a resin bonded glass cloth covering forward of the wings. The nose was extended to be better streamlined and a new, lower, single piece canopy introduced. Aft, the vertical surfaces remained wood but were swept.〔〔 The 1964 version of the Super Javelot increased the dihedral on the outer panels to 5.50°, refined the aerodynamics of the wing root to fuselage junction and covered the whole wing with birch ply to encourage laminar flow. The Wassmer WA 23 was a final, experimental development. It had a Super Javelot fuselage fitted with a new, 18 m (59 ft 1 in) span wing, an aspect ratio of 22 and a new airfoil profile specially designed by Maurice Collard. The empty weight of the WA 23 was 295 kg (650 lb). It flew for the first time on 6 August 1962. 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「Wassmer Javelot」の詳細全文を読む スポンサード リンク
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