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Schleicher Ka-4 Rhönlerche II

January 01, 1970

The Schleicher Ka-4 Rhönlerche II (English: Rhön Lark), sometimes called the KA-4 or even K 4, is a West German high-wing, strut-braced, two-seat glider that was designed by Rudolf Kaiser and produced by Alexander Schleicher GmbH & Co.[1][2][3]

Ka-4 Rhönlerche II
Role Glider
National origin West Germany
Manufacturer Alexander Schleicher GmbH & Co
Designer Rudolf Kaiser
First flight 7 December 1953
Introduction 1955
Status Production completed
Number built 338

Design and development edit

The Rhönlerche II was first flown 7 December 1953.[4] Its design goals were to produce a simple, inexpensive and robust two-seat trainer for school and club use. The design was a success and several hundred were constructed.[1][2]

 
Rhönlerche fuselage showing underlying welded steel tube structure

The Rhönlerche II is constructed with a welded steel tube fuselage and a wooden wing and tail surfaces, all finished in doped aircraft fabric covering. The 13.0 m (42.7 ft) span wing is supported by single lift struts and employs a Goettingen 533 airfoil. The aircraft's landing gear is a fixed monowheel, with a nose skid.[1][2][5]

The aircraft was issued a US type certificate on 28 September 1960.[3]

Operational history edit

The Ka-4 was widely used by clubs and schools in West Germany and also by Canadian military gliding clubs stationed in West Germany, including the Lahr Gliding Club at CFB Lahr. One of these aircraft was later shipped to Canada and operated by the Cold Lake Gliding Club at CFB Cold Lake and in July 2011 was owned by the Gravelbourg Gliding And Soaring Club, Gravelbourg, Saskatchewan.[2][6]

In July 2011 there were still five Ka-4s on the United States Federal Aviation Administration aircraft registry.[7]

Aircraft on display edit

 
Rhönlerche on display in the Technikmuseum Speyer
 
Museum Rhönlerche display

Specifications (Ka-4) edit

 
Ka-4 winch-launching

Data from Sailplane Directory, Soaring and Type Certificate 7G6,[1][2][3] The World's Sailplanes:Die Segelflugzeuge der Welt:Les Planeurs du Monde,[10] and manufacturer [11]

General characteristics

  • Crew: one
  • Capacity: one passenger
  • Length: 7.3 m (23 ft 11 in)
  • Wingspan: 13 m (42 ft 8 in)
  • Wing area: 16.34 m2 (175.9 sq ft)
  • Aspect ratio: 10.3:1
  • Airfoil: root: Göttingen 533 15.7%, mid: Göttingen 533 15.7%, tip: Göttingen 533 12.5%
  • Empty weight: 220 kg (485 lb)
  • Max takeoff weight: 400 kg (882 lb)

Performance

  • Stall speed: 56 km/h (35 mph, 30 kn)
  • Never exceed speed: 170 km/h (110 mph, 92 kn)
  • Rough air speed max: 120 km/h (75 mph; 65 kn)
  • Aerotow speed: 120 km/h (75 mph; 65 kn)
  • Winch launch speed: 90 km/h (56 mph; 49 kn)
  • g limits: +4.7 -2.3 at 170 km/h (106 mph)
  • Maximum glide ratio: 17.5:1 at 78 km/h (48 mph)
  • Rate of sink: 1.1 m/s (220 ft/min) at 62 km/h (39 mph)
  • Wing loading: 24.5 kg/m2 (5.0 lb/sq ft)

See also edit

Aircraft of comparable role, configuration, and era

Related lists

Notes edit

  1. ^ a b c d Activate Media (2006). "Ka-4 Rhonlerche Schleicher". Retrieved 22 July 2011.
  2. ^ a b c d e Said, Bob (November 1983). "1983 Sailplane Directory". Soaring Magazine. Soaring Society of America. USPS 499-920.
  3. ^ a b c Federal Aviation Administration (October 1960). "Type Certificate Data Sheet No. 7G6" (PDF). Retrieved 22 July 2011.
  4. ^ Segelflugzeugbau, Alexander Schleicher. "Ka 4 Rhönlerche II - ASSegelflug". alexander-schleicher.de. Retrieved 17 January 2019.
  5. ^ Lednicer, David (2010). "The Incomplete Guide to Airfoil Usage". Retrieved 22 July 2011.
  6. ^ Transport Canada (July 2011). . Archived from the original on 18 July 2011. Retrieved 22 July 2011.
  7. ^ Federal Aviation Administration (July 2011). "Make / Model Inquiry Results". Retrieved 22 July 2011.
  8. ^ Nationaal Luchtvaart-Themapark Aviodrome (n.d.). "Collectiestuk" (PDF). Retrieved 22 July 2011.
  9. ^ US Southwest Soaring Museum (2010). "Sailplanes, Hang Gliders & Motor Gliders". Retrieved 22 July 2011.
  10. ^ Shenstone, B.S.; K.G. Wilkinson; Peter Brooks (1958). The World's Sailplanes:Die Segelflugzeuge der Welt:Les Planeurs dans Le Monde (in English, French, and German) (1st ed.). Zurich: Organisation Scientifique et Technique Internationale du Vol a Voile (OSTIV) and Schweizer Aero-Revue. pp. 9–13.
  11. ^ Segelflugzeugbau, Alexander Schleicher. "Ka 4 Rhönlerche II - ASSegelflug". alexander-schleicher.de. Retrieved 17 January 2019.

References edit

  • Shenstone, B.S.; K.G. Wilkinson; Peter Brooks (1958). The World's Sailplanes:Die Segelflugzeuge der Welt:Les Planeurs dans Le Monde (in English, French, and German) (1st ed.). Zurich: Organisation Scientifique et Technique Internationale du Vol a Voile (OSTIV) and Schweizer Aero-Revue. pp. 9–13.
  • Said, Bob (November 1983). "1983 Sailplane Directory". Soaring Magazine. Soaring Society of America. USPS 499-920.
  • Federal Aviation Administration (October 1960). "Type Certificate Data Sheet No. 7G6" (PDF). Retrieved 22 July 2011.
  • Activate Media (2006). "Ka-4 Rhonlerche Schleicher". Retrieved 22 July 2011.
  • Lednicer, David (2010). "The Incomplete Guide to Airfoil Usage". Retrieved 22 July 2011.
  • Transport Canada (July 2011). . Archived from the original on 18 July 2011. Retrieved 22 July 2011.
  • Federal Aviation Administration (July 2011). "Make / Model Inquiry Results". Retrieved 22 July 2011.

External links edit

  Media related to Schleicher Ka 4 at Wikimedia Commons

January 01, 1970
schleicher, rhönlerche, english, rhön, lark, sometimes, called, even, west, german, high, wing, strut, braced, seat, glider, that, designed, rudolf, kaiser, produced, alexander, schleicher, gmbh, rhönlerche, role, glider, national, origin, west, germany, manuf. The Schleicher Ka 4 Rhonlerche II English Rhon Lark sometimes called the KA 4 or even K 4 is a West German high wing strut braced two seat glider that was designed by Rudolf Kaiser and produced by Alexander Schleicher GmbH amp Co 1 2 3 Ka 4 Rhonlerche II Role Glider National origin West Germany Manufacturer Alexander Schleicher GmbH amp Co Designer Rudolf Kaiser First flight 7 December 1953 Introduction 1955 Status Production completed Number built 338 Contents 1 Design and development 2 Operational history 3 Aircraft on display 4 Specifications Ka 4 5 See also 6 Notes 7 References 8 External linksDesign and development editThe Rhonlerche II was first flown 7 December 1953 4 Its design goals were to produce a simple inexpensive and robust two seat trainer for school and club use The design was a success and several hundred were constructed 1 2 nbsp Rhonlerche fuselage showing underlying welded steel tube structure The Rhonlerche II is constructed with a welded steel tube fuselage and a wooden wing and tail surfaces all finished in doped aircraft fabric covering The 13 0 m 42 7 ft span wing is supported by single lift struts and employs a Goettingen 533 airfoil The aircraft s landing gear is a fixed monowheel with a nose skid 1 2 5 The aircraft was issued a US type certificate on 28 September 1960 3 Operational history editThe Ka 4 was widely used by clubs and schools in West Germany and also by Canadian military gliding clubs stationed in West Germany including the Lahr Gliding Club at CFB Lahr One of these aircraft was later shipped to Canada and operated by the Cold Lake Gliding Club at CFB Cold Lake and in July 2011 was owned by the Gravelbourg Gliding And Soaring Club Gravelbourg Saskatchewan 2 6 In July 2011 there were still five Ka 4s on the United States Federal Aviation Administration aircraft registry 7 Aircraft on display edit nbsp Rhonlerche on display in the Technikmuseum Speyer nbsp Museum Rhonlerche display Aviodrome 3 8 Technikmuseum Speyer US Southwest Soaring Museum 2 9 Austrian Aviation Museum citation needed Specifications Ka 4 edit nbsp Ka 4 winch launching Data from Sailplane Directory Soaring and Type Certificate 7G6 1 2 3 The World s Sailplanes Die Segelflugzeuge der Welt Les Planeurs du Monde 10 and manufacturer 11 General characteristicsCrew one Capacity one passenger Length 7 3 m 23 ft 11 in Wingspan 13 m 42 ft 8 in Wing area 16 34 m2 175 9 sq ft Aspect ratio 10 3 1 Airfoil root Gottingen 533 15 7 mid Gottingen 533 15 7 tip Gottingen 533 12 5 Empty weight 220 kg 485 lb Max takeoff weight 400 kg 882 lb Performance Stall speed 56 km h 35 mph 30 kn Never exceed speed 170 km h 110 mph 92 kn Rough air speed max 120 km h 75 mph 65 kn Aerotow speed 120 km h 75 mph 65 kn Winch launch speed 90 km h 56 mph 49 kn g limits 4 7 2 3 at 170 km h 106 mph Maximum glide ratio 17 5 1 at 78 km h 48 mph Rate of sink 1 1 m s 220 ft min at 62 km h 39 mph Wing loading 24 5 kg m2 5 0 lb sq ft See also editAircraft of comparable role configuration and era Scheibe Specht Schweizer SGU 2 22 SZD 10 Czapla Related lists List of glidersNotes edit a b c d Activate Media 2006 Ka 4 Rhonlerche Schleicher Retrieved 22 July 2011 a b c d e Said Bob November 1983 1983 Sailplane Directory Soaring Magazine Soaring Society of America USPS 499 920 a b c Federal Aviation Administration October 1960 Type Certificate Data Sheet No 7G6 PDF Retrieved 22 July 2011 Segelflugzeugbau Alexander Schleicher Ka 4 Rhonlerche II ASSegelflug alexander schleicher de Retrieved 17 January 2019 Lednicer David 2010 The Incomplete Guide to Airfoil Usage Retrieved 22 July 2011 Transport Canada July 2011 Canadian Civil Aircraft Register Archived from the original on 18 July 2011 Retrieved 22 July 2011 Federal Aviation Administration July 2011 Make Model Inquiry Results Retrieved 22 July 2011 Nationaal Luchtvaart Themapark Aviodrome n d Collectiestuk PDF Retrieved 22 July 2011 US Southwest Soaring Museum 2010 Sailplanes Hang Gliders amp Motor Gliders Retrieved 22 July 2011 Shenstone B S K G Wilkinson Peter Brooks 1958 The World s Sailplanes Die Segelflugzeuge der Welt Les Planeurs dans Le Monde in English French and German 1st ed Zurich Organisation Scientifique et Technique Internationale du Vol a Voile OSTIV and Schweizer Aero Revue pp 9 13 Segelflugzeugbau Alexander Schleicher Ka 4 Rhonlerche II ASSegelflug alexander schleicher de Retrieved 17 January 2019 References editShenstone B S K G Wilkinson Peter Brooks 1958 The World s Sailplanes Die Segelflugzeuge der Welt Les Planeurs dans Le Monde in English French and German 1st ed Zurich Organisation Scientifique et Technique Internationale du Vol a Voile OSTIV and Schweizer Aero Revue pp 9 13 Said Bob November 1983 1983 Sailplane Directory Soaring Magazine Soaring Society of America USPS 499 920 Federal Aviation Administration October 1960 Type Certificate Data Sheet No 7G6 PDF Retrieved 22 July 2011 Activate Media 2006 Ka 4 Rhonlerche Schleicher Retrieved 22 July 2011 Lednicer David 2010 The Incomplete Guide to Airfoil Usage Retrieved 22 July 2011 Transport Canada July 2011 Canadian Civil Aircraft Register Archived from the original on 18 July 2011 Retrieved 22 July 2011 Federal Aviation Administration July 2011 Make Model Inquiry Results Retrieved 22 July 2011 External links edit nbsp Media related to Schleicher Ka 4 at Wikimedia Commons Retrieved from https en wikipedia org w index php title Schleicher Ka 4 Rhonlerche II amp oldid 1191085505, wikipedia, wiki, book, books, library,

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