name=Antonov A-9 | image=File:A9 von außen.jpg | caption= }}{{Infobox Aircraft Type | type=Single seat sailplane | national origin= | manufacturer= | designer=O.K. Antonov | first flight=1948 | introduced= | retired= | status= | primary user= | more users= | produced= | number built=27[1] | program cost= | unit cost= | developed from= | variants with their own articles= }} |
The A-9 was a cantilever, shoulder wing monoplane. In plan, the wing had a short, constant chord centre section and long, straight tapered outer panels, with a sweep on both edges, terminating in rounded and downward-curled wingtips. The panels were demountable from the centre section for transport; unusually, the centre section was an integral part of the fuselage structure, its single box spar spanning the 3.2 m (10 ft 6 in) section unbroken. The spar continued beyond the central section-outer panel joint, the whole wing having plywood covering ahead of the spar and aircraft fabric covering aft. Long span, tapered, fabric covered and mass balanced ailerons occupied about ⅔ of the trailing edges of the outer panels; these panels also carried Schempp-Hirth-type airbrakes, placed just behind the spar and ending at the panel mounting joint. The wing section was slightly reflexed towards the rear and thick, with maximum depth far forward at only about 20% chord, making the profile steep-nosed.
The ply-covered fuselage of the A-9 was oval in cross-section, deep ahead of the wings and almost circular to the rear, giving it a pod-and-boom appearance. The fixed tail surfaces were also ply-covered, the fin narrow but with a small fuselage fillet. The control surfaces were fabric covered. In plan the horizontal tail was tapered with sweep on both edges; the broad, curved and balanced rudder reached to the keel and was hinged well aft, almost in line with the elevator trailing edge, for clearance and moment. The upper fuselage line was almost flat, even over the rear part of the long, two piece canopy, though its windscreen curved down sharply into the nose. There was no skid or wheeled undercarriage; instead the A-9 was launched from a wheeled, drop-off dolly and landed on the locally internally strengthened fuselage underside, aided by a tail bumper.
Overall, the structure of the A-9 was heavy and so the wing loading was high at 30.5 kg/m² (6.2 lb/ft2),[ compared, for example, with the Slingsby T.25 Gull 4, a contemporary glider with a wing loading of 22.3 kg/m² (4.6 lb/ft2).[6] Higher wing loadings provide higher speeds and better glide angles between thermals but poor climbing in weak lift.[7] The Red Front 7 is known to have used water ballast on its record flight[7] but the A-9 was not thus equipped.[1]]
Operational history
Because of their speed, the A-9s concentrated mostly on competition flying and record setting.[1]
Variants
Data from Sailplanes 1945–1965- 16.24 m (53 ft 3in) span
- Standard version.
- 16.50 m (53 ft 11 in) extended span
- Weight increased by 10 kg (22 lb) but useful load 100 kg (220 lb) as standard, wing area decreased to 12.2 m² (131 ft2), wing loading 34.5 kg/m² (7.0 lb/ft2). This version may have been named the Antonov A-10, though other sources associate this designation with a two-seat variant of the A-9.[1]
Specifications
{{Aircraft specs
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|empty weight kg=310
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|gross weight kg=410
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|sink rate ms=0.8
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|lift to drag=Maximum 30:1
|wing loading kg/m2=30.5
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- Landing speed:70 km/h; 38 kn (44 mph)
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}}References
{{commons category}}1. ^1 Simons (2006), p. 36.
2. ^1 2 Simons (2006), p. 8.
3. ^1 2 3 4 {{cite web |url=http://www.scalesoaring.co.uk/VINTAGE/Documentation/A-9/A-9_Docs.html|title=Antonov A-9 |author= |date= |work= |publisher= |accessdate=20 April 2012}}
[1][2][3]
}}{{Antonov aircraft}} 4 : Antonov aircraft|Soviet sailplanes 1940–1949|Glider aircraft|Aircraft first flown in 1948