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Tech. Performance

About WINDEX 1200C


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WINDEX 1200 C design philosophy

The powered sailplane gives its pilot maximum freedom of the skies with a minimum of trouble and waiting usually associated with gliding activities.

Powered Sailplane for Amateur Construction by WINDEXAIR AB


You could for instance on a beautiful day go soaring without having to organise a ground crew, tow-plane and pilot etc at short notice. The easy ground handling and self-launching capability of WINDEX 1200 C means utilising your precious time to the full.

WINDEX 1200 C is primarily a high-performance sailplane, but its unique concept with a low-drag fin-mounted engine installation and a variable-pitch propeller turns it also into an efficient touring aircraft with a cruising speed of 210 km/h (130 mph).


In addition to this the airframe of WINDEX 1200 C is stressed for aerobatic manoeuvres and designed to JAR 22 (A). This may be exploited accordingly if you have the necessary training and feel so inclined, or could be regarded as an extra safety margin in normal flying.


Powered sailplanes are nothing new. Different types have been available for a number of years. Most of the types on the market so far fall into one of 3 categories: 2-seat trainers with acceptable power-on performance but at best mediocre gliding capability, 15-26 metre span sailplanes based on racing designs and with retractable engines, excellent gliding capability but heavy and with relatively poor power performance and the need for ground assistance, and finally homebuilt powered gliders with poor performance in either mode.


WINDEX 1200 C represents a different concept. It's a powered high-performance sailplane that can be easily handled on the ground by one person. It is affordable and could be that "personal" aircraft you have been waiting for. We are convinced there is a definite need for this type of aircraft where you can decide yourself when, where and how you want to fly.

Even with engine nacelle, propeller and a 20% smaller span it has a soaring performance equal to or better then a 15-metre Standard Cirrus glider. It also has a climb rate of approximately 2.5 metre/sec (685 fpm), under power.


At the same time the WINDEX 1200 C is designed as a pilot's aeroplane with lively but pleasantly balanced control response and not requiring undue piloting skill.

All these claims may sound too good to be true, but in order to achieve this we have developed a unique concept, applied advanced aerodynamics, used modern aerospace materials together with sophisticated manufacturing methods, derived innovative mechanical designs and moreover developed a special variable-pitch propeller.
The performance and handling qualities of the pre-prototype WINDEX 1100 once verified the feasibility of a small, high-performance powered sailplane. Flight testing of the WINDEX 1200C has reviled even smoother control harmony and handling qualities.


To make it affordable we are producing the WINDEX 1200 C now in the form of a kit, where major airframe components are supplied as mouldings but much of the time-consuming fitting work is left to the builder. The design concept also necessitated a special compact engine and feathering propeller unit, that also is part of the kit.

A short history of WINDEX motorised sailplane development:


1980: Sven-Olof Ridder and Harald Undén start a hobby project which was intended to become a very light self-launching glider.
1983: WINDEX wing section developed and tested in wind tunnel.
1985: WINDEX 1100 (unpowered) flies and work have started on moulds for powered version with 12 m. span, WINDEX 1200 C.
1986: ALL WINDEX 1200 C moulds burn in a factory fire after only 2 sets of laminates have been produced.
1987: WINDEX 1200 C prototype is shown on Paris Air show.
1990: New moulds are being produced for kit production model, WINDEX 1200 C, fully aerobatic, with carbon fibre spars.
1991: WINDEX 1200 C prototype takes part in Aerobatic World Championships for Gliders in Poland. Bronze medal in 2 categories.
1993: 10 "pilot-builders" in Sweden and abroad are testing kit parts, drawing, manual etc.
1992-1995: Intensive kit development work, product testing, 2 factory prototypes under construction.
1996: First amateur-constructed kit WINDEX 1200C is airborne.
1999: WINDEXAIR AB takes over the Windex 1200C project from RADAB.

Four Windex 1200C at EAA fly-in at Barkaby 1999