| 词条 | Schleicher K 8 | |||||||||||||||
| 释义 |
The Schleicher K 8 (also known as Ka-8) is a single-seat glider designed by Rudolf Kaiser and built by the Alexander Schleicher company of Germany. Design and developmentThe K 8 was derived from the earlier Ka 6 design as a simple single-place sailplane with dive brakes using construction techniques similar to the Schleicher K 7, simplified for amateur construction from kits. Emphasis was on rugged construction, good climbing ability in thermals and good handling characteristics. The prototype K 8 made its first flight in November 1957 and over 1,100 were built in three main versions. The original K 8 had a very small canopy. Side windows for improved visibility were introduced in the next version, and the K 8B, by far the most numerous variant, has a larger one-piece blown Plexiglas canopy. The K 8C features a longer nose, larger main wheel located ahead of the center of gravity and deletion of the larger wooden nose skid resulting in a roomier cockpit. The cantilever high wings are single-spar structures of pine and plywood, with a plywood leading edge torsion box and fabric covering aft of the spar; the forward sweep is 1° 18' and dihedral is 3°. There are Schempp-Hirth air brakes in the upper and lower surfaces and the wooden ailerons are plywood covered. The cantilever tail unit is of similar construction to the wings, with ply-covered fixed surfaces and fabric-covered rudder and elevators, and a trim tab in the elevator is an optional fitting. The fuselage is a welded steel-tube structure, with fabric covering over spruce longerons and a glass fibre nose cone. There is a non-retractable and unsprung monowheel, with optional brake, and a nose skid mounted on rubber blocks in front of it, plus a steel skid at the tail. Operational historyKarl Striedieck of the United States made a 767 km / 476.6 mile ridge flight in a K 8B to establish a world out-and-return record in 1968. Motor glider variantsA motor glider conversion of the K 8B was developed by LVD (the Flying Training School of the Detmold Aero Club) similar to their conversion of a Scheibe Bergfalke IV known as the BF IV-BIMO, in which a Lloyd LS-400 piston engine mounted in the fuselage drives a pair of small two-blade pusher propellers rotating within cutouts in each wing near the trailing edge. Another motorglider conversion was used by "Vestjysk Svæveflyveklub" in Denmark: it had a small Wankel rotary engine mounted in a nacelle on an aluminium stick above the main spar. The engine was started with a recoil starter like a lawn mower. The high RPM of the device made it extremely unpopular: the propeller tips created a permanent sonic boom, that made the plane extremely noisy. The harassed citizens of Esbjerg nicknamed the plane 'the flying circular saw' and the engine was removed.{{citation needed|date=June 2012}} Specifications (K 8B){{Aircraft specs|ref=[1] The World's Sailplanes:Die Segelflugzeuge der Welt:Les Planeurs du Monde Volume II[2] |prime units?=met |crew=1 |capacity= |length m=7 |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= |height ft= |height in= |height note= |wing area sqm=14.15 |wing area sqft= |wing area note= |swept area sqm= |swept area sqft= |swept area note= |volume m3= |volume ft3= |volume note= |aspect ratio=15.9 |airfoil=Root: Göttingen 533 16.7%,Mid: Göttingen 533, Tip: Göttingen 532 |empty weight kg=191 |empty weight lb= |empty weight note= |gross weight kg=310 |gross weight lb= |gross weight note= |max takeoff weight kg= |max takeoff weight lb= |max takeoff weight note= |more general= |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=55 |stall speed mph= |stall speed kts= |stall speed note= |never exceed speed kmh=200 |never exceed speed mph= |never exceed speed kts= |never exceed speed note=
|minimum control speed kmh= 70 |minimum control speed mph= |minimum control speed kts= |minimum control speed note= no ballast, full flaps |g limits=+4 -2 at {{convert|151|km/h|mph kn|abbr=on|1}} |roll rate= |glide ratio=27 at {{convert|73|km/h|mph kn|abbr=on|1}} |sink rate ms=0.67 |sink rate ftmin= |sink rate note= at {{convert|60|km/h|mph kn|abbr=on|1}} |lift to drag= |wing loading kg/m2=21.8 |wing loading lb/sqft= |wing loading note= |more performance= }} See also{{aircontent|see also= |related= |similar aircraft=Scheibe L-Spatz |lists=
}} Notes1. ^{{cite book|author-link=John W. R. Taylor|last=Taylor|first=John W. R.|title=Jane's All The World's Aircraft 1966–67|year=1966|publisher=Sampson Low, Marston & Company|location=London|pages=393–394}} 2. ^{{cite book|last=Shenstone|first=B. S.|title=The World's Sailplanes:Die Segelflugzeuge der Welt:Les Planeurs du Monde Volume II|year=1963|publisher=Organisation Scientifique et Technique Internationale du Vol a Voile (OSTIV) and Schweizer Aero-Revue|location=Zurich|pages=34–36|edition=1st|author2=K.G. Wilkinson |language=English, French, German}} References{{refbegin}}
External links{{Commons category|Schleicher K 8}}
5 : German sailplanes 1950–1959|Schleicher aircraft|High-wing aircraft|Aircraft first flown in 1957|Glider aircraft |
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