Alexander Schleicher ASW 20

Description

ASW 20 is a Planeur of class FAI 15 meters, conceived by engineer Gerhard Waibel and built by the company Alexander Schleicher GMBH. Its fuselage is identical to ASW19, and is equipped with wings of new design for the class 15 meters. The prototype accomplished its first flight in 1977. It proved that it is a sailplane of performance, because gaining many championships of the world and its level remained until 1995. The development continued all along the production by the addition of pneumatic turbulateurs, Winglet, and prolongations of wing. It remained in production until 1990, when it was replaced by ASW27. 765 specimens were built by Schleicher and 140 were built under license by the company Centrair (France).

History

The ASW 20 accomplished its first flight in 1977 and allowed gained several championship of the world and nationals. Dick Johnson said that the ASW20 was first sailplane 15 measures scale exceeded the smoothness of 40. Roy McMaster, Karl Striedeck and John Seymour carried out a triangle of 1.435 kilometers in 1994 with a ASW20B. The ASW 20 took 2nd and 3rd places of the championship 1983 of the world in class of 15 meter.

Construction

The ASW20 is built in Glass fiber. It is equipped with camber flap which is operated from -9 to 5 degrees and are coupled with the ailerons for avoided the opposite lace. The ASW 20 is equipped with air-brake of the type Schempp-Hirth.

The model B (introduced in 1983) is different from the model has and C because it included Carbon fiber in the member of the wing, which allows augnement capacity of the ballasts depends on the inflection of the wing. The model B and C introduce several improvement compared to the model has, by a hydraulic disc brake, an automatic connection depth, but also a pneumatic system of turbulator of the Boundary layer which is composed of 860 holes to control the limiting separation of layers.

The model L is equipped with extension of wing of 1.59 Mr. The model F was assigned with the alternatives of the model produced in France by Centrair (France). Centrair also produced a model FL equivalent to the German ASW20L, the majority of the latter are only authorized to fly without extensions of wing due to a weakness of the construction of the member.

At least 3 designs different of Winglet were produced for the ASW-20, including a winglet of design of NASA by Peter Masak for the Centrair models. A second generation conceived by professor D. Maughmer of the university of the State of Pennsylvania (the United States). Like some not approved amateur manufacture

Carateristique of flight

The ASW 20 is a sailplane recognized like a very pleasant sailplane to control. The ailerons of landing (65° in the first models, 45° in the last models), at the same time as the very effective Air-brake S, make it possible to the pilot to make particularly stiff approaches and short landings. The second generation was equipped with Winglet to reduce the trail at the low and average speeds and to improve its behavior. The flexible wing of the models has and a.c. favoured the inclined flight, because the wing absorbed turbulences.

Photograph

Technical data

The ASW 20 C and CL thus are different the federation of BL only by one mass on max. takeoff from 454 kg (380 kg with CL), a weaker wing load of 43 kg/m ² (34,5k g/m ²) and a maximum speed of 265 km/h (250 km/h with CL).

Sources

Alexander Schleicher GMBH & Co

Random links: