OFW OK-15

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OK-15
Role Two-seat light monoplane
National origin Austria
Manufacturer OFW[1]
Designer Otto Kauba
First flight 16 July 1956
Number built 1

The OFW OK-15 was a 1950s Austrian two-seat light aircraft. Designed by Otto Kauba and built by the (OFW) at Wiener Neustadt, it was the first aircraft to be designed and built in Austria for 20 years.[1][2][3]

Design and development[]

The OK-15 was a light sports monoplane of conventional design with a low wing, enclosed side-by-side two-seat cockpit and fixed undercarriage with tailwheel. It was manufactured using traditional materials of metal, wood and fabric, and stressed for aerobatics. It had a span of 7.6 m (25 ft) and length 6.5 m (21 ft).

The aircraft was powered by a 105 horsepower (78 kW) Walter Minor 4-III piston engine, giving it an estimated cruise speed of 202 km/h (126 mph; 109 kn).[1][4]

The only prototype was registered OE-VAM and first flown on 16 July 1956. Subsequent fight tests showed its handling to be unsatisfactory and it was not put into production.[5][4]

Specification[]

Data from Österreichs Luftfahrt in Einzeldarstellungen: Propeller-Luftfahrzeugkonstruktionen seit 1945,[4] Jane's All the World's Aircraft 1958-59.[6]

General characteristics

  • Crew: 2
  • Length: 6.50 m (21 ft 4 in)
  • Wingspan: 7.60 m (24 ft 11 in)
  • Height: 1.73 m (5 ft 8 in)
  • Wing area: 11.0 m2 (118 sq ft)
  • Aspect ratio: 5.25
  • Empty weight: 505 kg (1,113 lb)
  • Gross weight: 788 kg (1,737 lb)
  • Fuel capacity: 90 l (24 US gal; 20 imp gal)
  • Powerplant: 1 × Walter Minor 4-III 4-cylinder inverted inline air-cooled, 78 kW (105 hp)
  • Propellers: 2-bladed wooden fixed-pitch propellerfor take-off
60 kW (80 hp) continuous at 2300 rpm

Performance

  • Maximum speed: 202 km/h (126 mph, 109 kn) at 300 m (984 ft)
  • Cruise speed: 180 km/h (110 mph, 97 kn) at 300 m (984 ft)
  • Landing speed: 75 km/h (47 mph; 40 kn)
  • Range: 630 km (390 mi, 340 nmi)
  • Endurance: 3 hours 30 minutes with reserve
  • Service ceiling: 4,100 m (13,500 ft)
  • Rate of climb: 3.33 m/s (655 ft/min)
  • Time to altitude: 1,000 m (3,281 ft) in 6 minutes 45 seconds
  • Wing loading: 71.63 kg/m2 (14.67 lb/sq ft)
  • Power/mass: 0.099 kW/kg (0.06 hp/lb)
  • Take-off run: 200 m (656 ft) on grass
  • Landing run: 110 m (361 ft) on grass

References[]

  1. ^ a b c "Did You Know...?". Air Pictorial. XVIII (8): 285. August 1956.
  2. ^ Gunston, Bill; World Encyclopedia of Aircraft Manufacturers, 2nd ed, Sutton (2005), p.345.
  3. ^ "Air Intelligence: Austria". Flight: 73. 18 January 1957. Retrieved 6 August 2013.
  4. ^ a b c Keimel, Reinhard (1980). Österreichs Luftfahrt in Einzeldarstellungen: Propeller-Luftfahrzeugkonstruktionen seit 1945 (Austrian Aviation in Individual Profiles: Propeller aircraft from 1945) (in German). Weishaupt.
  5. ^ Austria's Flight History, Loan Airport, Diamond SFCA. (retrieved 6 January 2019).
  6. ^ Bridgman, Leonard, ed. (1957). Jane's All the World's Aircraft 1958-59. London: Jane's All the World's Aircraft Publishing Co. Ltd. p. 46.
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