Schleicher Ka 2 Rhönschwalbe

{{Short description|German two-seat glider, 1953}}

{{Multiple issues|

{{Lead too short|date=June 2022}}

{{More citations needed|date=June 2022}}

}}

{{Infobox Aircraft Begin

| name=Ka2 Rhönschwalbe

| image=Ka2b after landing.jpg

| caption=A Ka–2 on landing

}}{{Infobox Aircraft Type

| type=two-seat training glider

| national origin=Germany

| manufacturer=Alexander Schleicher GmbH & Co

| designer=Rudolf Kaiser

| first flight= Spring 1953

| introduced=

| retired=

| status=

| primary user=

| more users=

| produced=1953 - 1957

| number built=Ka–2 42 built, Ka–2b 75 built

| program cost=

| unit cost=

| developed from=

| variants with their own articles=

}}

The Schleicher Ka-2 Rhönschwalbe is a tandem two-seat training glider designed and built in Germany, in 1952.

Design and development

Designed by Rudolf Kaiser, the Ka-2 was an all wooden glider with plywood and aircraft fabric covering. The Ka-2s wings, with marked forward sweep and dihedral are mounted above the fuselage, flanking the rear cockpit. The front cockpit is covered by a one piece plexiglas canopy which opens to the right and the rear cockpit is covered by a canopy incorporating the inner leading edges of the wing, opening rear-wards, held in place by the front canopy when closed.{{cite book|last=Seliger|first=Peter F.|title=Rhön-Adler. 75 Jahre Alexander Schleicher Segelflugzeugbau|date=1 January 2003|publisher=R. G. Fischer Verlag|location=Frankfurt a.M.|isbn=3830104375|language=German}}

The undercarriage of the Ka-2 comprises a large rubber-sprung wooden skid under the forward fuselage in front of a non-retractable semi recessed mainwheel, as well as a steel rubber-sprung tail-skid. Conventional controls are fitted with ailerons on each wingtip trailing edge, elevator with anti-balance trim tab behind the tailplane and rudder aft of the fin. Schempp-Hirth airbrakes, at 38% chord and approx ⅓ span, open out above and below the wing to provide approach control.

Performance of the Ka-2 was found to be lower than expected, due to the relatively high wing loading. Schleicher introduced the Ka2b, increasing the wingspan from {{convert|15|m|ft|abbr=on}} to {{convert|16|m|ft|abbr=on}}, to improve the efficiency of the wing. Fuselage length was also increased by {{convert|18|cm|in|abbr=on}} to {{convert|8.15|m|ft|abbr=on}} to maintain stability margins in pitch.

Performance of the Ka-2b was improved in weak thermals due to a lower minimum sink speed, allowing tighter thermalling. Cross-country performance was also improved by a higher glide ratio, increasing the chance of reaching the next thermal. The standard competition handicap for the Ka–2 is 74 and the Ka-2b handicap is 78.

File:D5596inUnterwössen.jpg

Operational history

The Ka-2 and Ka-2b saw extensive use in gliding clubs throughout Germany and Europe and the Ka2b was also used in several record attempts; On 24 January 1959 Dieter Schmitt and Karl Pummer climbed a Ka-2b {{convert|6907|m|ft|abbr=on}} in lee wave lift at Fayence in France for a new German National two-seater record climb. Later the same day flying to {{convert|7700|m|ft|abbr=on}} to set a new German two-seater absolute altitude record.

A Ka2b also set a distance record for two seaters in Germany of {{convert|424.5|km|mi nmi|abbr=on}} in 1964 and again on 28 May 2012 at

{{convert|684|km|mi nmi|abbr=on}}, flown by Uli Schwenk and his 81-year-old father.

Variants

;Ka-2: The initial production glider with a {{convert|15|m|ft|abbr=on}} span wing and {{convert|7.97|m|ft|abbr=on}} long fuselage.

;Ka-2b:An improved performance version with {{convert|16|m|ft|abbr=on}} span wings and {{convert|8.15|m|ft|abbr=on}} fuselage.

Specifications (Ka-2)

{{Aircraft specs

|ref=Sailplanes 1945-1965,{{cite book |last=Simons |first=Martin |title=Sailplanes 1945-1965 |url=https://archive.org/details/sailplanes00simo |url-access=limited |year=2006 |publisher=EQIP Werbung und Verlag |location=Königswinter |isbn=978-3-9807977-4-0 |edition=2nd revised|pages=[https://archive.org/details/sailplanes00simo/page/n82 80]–82}} and The World's Sailplanes:Die Segelflugzeuge der Welt:Les Planeurs du Monde{{cite book |last=Shenstone |first=B.S. |title=The World's Sailplanes:Die Segelflugzeuge der Welt:Les Planeurs du Monde|year=1958 |publisher=Organisation Scientifique et Technique Internationale du Vol a Voile (OSTIV) and Schweizer Aero-Revue |location=Zurich |pages=82–87 |edition=1st |author2=K.G. Wilkinson |language=English, French, German}}

|prime units?=met

|genhide=

|crew=2

|capacity=

|length m=7.97

|length ft=

|length in=

|length note=

|span m=15

|span ft=

|span in=

|span note=

|upper span m=

|upper span ft=

|upper span in=

|upper span note=

|mid span m=

|mid span ft=

|mid span in=

|mid span note=

|lower span m=

|lower span ft=

|lower span in=

|lower span note=

|swept m=

|swept ft=

|swept in=

|swept note=

|dia m=

|dia ft=

|dia in=

|dia note=

|width m=

|width ft=

|width in=

|width note=

|height m=1.7

|height ft=

|height in=

|height note=

|wing area sqm=16.8

|wing area sqft=

|wing area note=

|swept area sqm=

|swept area sqft=

|swept area note=

|volume m3=

|volume ft3=

|volume note=

|aspect ratio=13.4

|airfoil=Wing root: Göttingen 533 modified 16%, Mid span: Göttingen 533 14%, Wing tip: Göttingen 533 12%

|empty weight kg=254

|empty weight lb=

|empty weight note=

|gross weight kg=460

|gross weight lb=

|gross weight note=

|max takeoff weight kg=

|max takeoff weight lb=

|max takeoff weight note=

|fuel capacity=

|lift kg=

|lift lb=

|lift note=

|more general=

|eng1 number=

|eng1 name=

|eng1 type=

|eng1 kw=

|eng1 hp=

|eng1 kn=

|eng1 lbf=

|eng1 note=

|power original=

|thrust original=

|eng1 kn-ab=

|eng1 lbf-ab=

|eng2 number=

|eng2 name=

|eng2 type=

|eng2 kw=

|eng2 hp=

|eng2 kn=

|eng2 lbf=

|eng2 note=

|eng2 kn-ab=

|eng2 lbf-ab=

|eng3 number=

|eng3 name=

|eng3 type=

|eng3 kw=

|eng3 hp=

|eng3 kn=

|eng3 lbf=

|eng3 note=

|eng3 kn-ab=

|eng3 lbf-ab=

|more power=

|prop blade number=

|prop name=

|prop dia m=

|prop dia ft=

|prop dia in=

|prop dia note=

|rot number=

|rot dia m=

|rot dia ft=

|rot dia in=

|rot area sqm=

|rot area sqft=

|rot area note=

|perfhide=

|max speed kmh=

|max speed mph=

|max speed kts=

|max speed note=

|max speed mach=

|cruise speed kmh=

|cruise speed mph=

|cruise speed kts=

|cruise speed note=

|stall speed kmh=58.5

|stall speed mph=

|stall speed kts=

|stall speed note=

|never exceed speed kmh=170

|never exceed speed mph=

|never exceed speed kts=

|never exceed speed note=in smooth air

  • Rough air speed max: {{convert|130|km/h|mph kn|abbr=on|0}}
  • Aerotow speed: {{convert|130|km/h|mph kn|abbr=on|0}}
  • Winch launch speed: {{convert|100|km/h|mph kn|abbr=on|0}}

|minimum control speed kmh=

|minimum control speed mph=

|minimum control speed kts=

|minimum control speed note=

|range km=

|range miles=

|range nmi=

|range note=

|combat range km=

|combat range miles=

|combat range nmi=

|combat range note=

|ferry range km=

|ferry range miles=

|ferry range nmi=

|ferry range note=

|endurance=

|ceiling m=

|ceiling ft=

|ceiling note=

|g limits=+4g at {{convert|126|km/h|mph kn|abbr=on}}, -2g at {{convert|168|km/h|mph kn|abbr=on}}

|roll rate=

|glide ratio=

|climb rate ms=

|climb rate ftmin=

|climb rate note=

|time to altitude=

|sink rate ms=0.9

|sink rate ftmin=

|sink rate note=at {{convert|65|km/h|mph kn|abbr=on}} at {{convert|415|kg|lb|abbr=on}}

|lift to drag=26:1 at {{convert|80|km/h|mph kn|abbr=on}} at {{convert|415|kg|lb|abbr=on}}

|wing loading kg/m2=27.4

|wing loading lb/sqft=

|wing loading note= at {{convert|460|kg|lb|abbr=on}}

|disk loading kg/m2=

|disk loading lb/sqft=

|disk loading note=

|more performance=

}}

See also

{{aircontent

|see also=

|related=*Schleicher Ka7

|similar aircraft=

|lists=

}}

Notes

{{reflist}}

References

{{refbegin}}

  • {{cite book |last=Simons |first=Martin |title=Sailplanes 1945-1965 |url=https://archive.org/details/sailplanes00simo |url-access=limited |year=2006 |publisher=EQIP Werbung und Verlag |location=Königswinter |isbn=978-3-9807977-4-0 |edition=2nd revised|pages=[https://archive.org/details/sailplanes00simo/page/n82 80]–82}}
  • {{cite book |last=Shenstone |first=B.S. |title=The World's Sailplanes:Die Segelflugzeuge der Welt:Les Planeurs du Monde|year=1958 |publisher=Organisation Scientifique et Technique Internationale du Vol a Voile (OSTIV) and Schweizer Aero-Revue |location=Zurich |pages=82–87 |edition=1st |author2=K.G. Wilkinson |language=English, French, German}}
  • {{cite book|last=Seliger|first=Peter F.|title=Rhön-Adler. 75 Jahre Alexander Schleicher Segelflugzeugbau|date=1 January 2003|publisher=R. G. Fischer Verlag|location=Frankfurt a.M.|isbn=3830104375|language=German}}

{{refend}}

Further reading

  • Richard und Monique Ferrière: Les Planeurs et Motoplaneurs d' Alexander Schleicher 1951–1981. Motorbuch-Verlag, Stuttgart 1988, {{ISBN|3613011905}}.