Schleicher K 8

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The Schleicher K 8 is a single-seat glider designed by Rudolf Kaiser and built by the Alexander Schleicher company of Germany.

History and characteristics

The 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; their forward sweep is 1ø 18' and dihedral is 3ø. 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 glassfibre 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 spur at the tail.

A 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 was a small Wankel rotary engine mounted in a nacelle on a aluminium stick above the main spar. The engine could be started with a recoil starter similar in style to a lawn mower. The high RPM's 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'.After this event, the engine was dismantled, never to be used again.

Karl 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.

pecifications

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crew=One
capacity=
length m=7.00
length ft=23
length in=0
span m=15.00
span ft=49
span in=3
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height m=1.57
height ft=5
height in=2
wing area sqm=14.2
wing area sqft=152
swept area sqm=
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volume m3=
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aspect ratio= 15.9
wing profile= Göttingen 533/532
empty weight kg=190
empty weight lb=418
gross weight kg=310
gross weight lb=682
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max speed kmh=200
max speed mph=125
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glide ratio= 27
climb rate ms=
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sink rate ms= 0.65
sink rate ftmin= 128

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References

* [http://www.alexander-schleicher.de/ Schleicher Web Site]
* [http://www.sailplanedirectory.com/PlaneDetails.cfm?PlaneID=183 Sailplane directory]