The Robbe COBRA 4K is a 3-axis radio-controlled sailplane kit built from balsa wood, designed for intermediate to advanced modellers who want a hands-on building experience with a classic retro design.
2005 mm wingspan with flaps for precise thermal soaring and extended flight duration
Balsa wood construction keeps the airframe light yet rigid, improving glide ratio and manoeuvrability
Designed for electric or combustion power — adapt the build to your preferred propulsion system
Includes flaps, ailerons, and elevator for full 3-axis control authority in the air
What makes the COBRA 4K stand out
The COBRA 4K combines a traditional retro silhouette with modern 3-axis control surfaces. The balsa wood kit format gives builders full control over finish quality and weight distribution, while the 2005 mm span provides enough surface area for relaxed thermal flying without demanding a large launch setup.
Ideal for
Modellers with intermediate assembly skills who enjoy building from a balsa kit and want a sailplane that rewards careful construction with stable, long-duration flights. Suitable for club flying and private slope soaring where thermal conditions allow extended airborne time.
Application of the Robbe COBRA 4K
Once assembled and balanced, the COBRA 4K is launched by hand or with a bungee launch system and flown as a pure sailplane, relying on thermals and ridge lift. The 3-axis control suite allows precise manoeuvres, thermal circling, and landing approaches. Recommended for outdoor flying in calm to moderate wind conditions on open slopes or in thermic inland areas.
Robbe is a German manufacturer specialising in radio-controlled model aircraft, known for traditional balsa wood kits and sailplane designs. The brand has a long heritage in the RC modelling community and focuses on kits that require assembly and finishing by the builder.
The Robbe COBRA 4K is a 3-axis radio-controlled sailplane kit made from balsa wood, featuring a 2005 mm wingspan and flaps for thermal soaring.
The COBRA 4K is designed for both electric and combustion engines. The builder selects and installs the motor, battery, or engine setup according to their preference and local flying regulations.
The kit includes balsa wood parts, flaps, ailerons, and elevator control surfaces. Additional items required for completion are a battery, covering film, adhesives, a charger, a motor, an RC system, a speed controller, servos, and basic tools.
The 2005 mm wingspan provides a large lifting surface that enables efficient thermal soaring and extended flight durations, making the COBRA 4K suitable for relaxed slope and thermal flying.
Robbe offers a 24-month manufacturer warranty on the COBRA 4K kit. The warranty covers manufacturing defects in the balsa wood parts and control surfaces under normal use.
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