Schleicher Ka 3 Short Kit or Plan


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The Ka-3 Model Glider

This not a project for the beginner; it will however appeal to many modellers who like a challenge building something a little different. The Ka-3 model glider designed for radio control is one of Cliff Charlesworth’s most adventurous projects. Its performance is excellent considering that it is of vintage status.

Scale 1/4 Wingspan: 2.5Mtr

SKU: LCS-CC-short-kit-plan Category:


Schleicher Ka 3 Glider

The Schleicher Ka 3 or Kaiser Ka 3, is a 1950s single seat training glider, mostly sold in kit form.

Design and development

The Ka 3 and its predecessor the Ka 1 were mostly sold as kits for home assembly. Apart from their fuselages the two types are very close in appearance, simplicity, weight and performance. They share a round tipped high wing with constant chord and no sweep, mounted with 2.5° of dihedral and braced with a single lift strut on each side from the lower fuselage to the wing at about one third span. Plain, constant-chord ailerons reach almost from the tips to about mid span and upper wing spoilers are placed at mid chord, inboard of the ailerons. Both have 37° butterfly tails with straight leading edges and round tips and trailing edges.

The Ka 1 has a ply-covered, rounded wooden-framed fuselage but that of the Ka 3 is more angular, steel tube-framed, fabric covered and slightly longer. Both have a simple, deep, sprung landing skid reaching from the nose to under the trailing edge of the wing, assisted by a tail bumper. Their cockpits are under the wing leading edge, into which the clear canopy extends.

The Ka 1 first flew in 1951 and ten were built; the Ka 3 followed in 1954 with fifteen eventually completed. One Ka 1 and two Ka 3s remained on the German civil aircraft register in 2010.

Ka 1 Rhönlaus
Original version with rounded, wooden fuselage. First flown 1951. 10 built.

Ka 3 Development with a slightly longer, fabric-covered steel-tube fuselage. Performance and weights as Ka 1. First flown in 1954. 15 produced.

Specifications (Ka 3)

General Characteristics

Crew: One Length: 5.45 m (17 ft 11 in)
Wingspan: 10.00 m (32 ft 10 in)
Wing area: 9.9 m2 (107 sq ft)
Aspect ratio: 10.1
Airfoil: Göttingen 549
Empty weight: 100 kg (220 lb) equipped
Max takeoff weight: 195 kg (430 lb)
Wing loading: 19.5 kg/m2 (5.2 lb/sq ft) maximum


Maximum speed: 160 km/h (99 mph; 86 kn) placard, smooth air. All performance figures at a flying weight of 180 kg (397 lb)
Maximumun speed, placard, rough air: 100 km/h (62 mph; 54 kn)
Maximumun aero-tow speed: 100 km/h (62 mph; 54 kn)
Maximumun winch launch speed: 90 km/h (56 mph; 49 kn)
Stall speed: 53 km/h (33 mph; 29 kn)
Maximum glide ratio: best, 17.5:1 at 75 km/h (47 mph; 40 kn)
Rate of sink: 1.0 m/s (200 ft/min) at 65 km/h (40 mph; 35 kn)


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