WINDEX 1200 Technical Page

This image is made by Jukka Tervamäki Tervis@topias.pp.fi

Aerodynamical development

Wing airfoil section

Our own specially designed 17% thick airfoil section has comparatively low drag and a wide low drag bucket that is further expanded by a 22.5% chord trailing edge flap. The basic airfoil has very docile stall characteristics in both smooth and rough condition.

Speed polar of WINDEX 1200 C

Even with engine nacelle, propeller and a 20% smaller span WINDEX 1200 C has a soaring performance equal to or better then a 15-metre Standard Cirrus glider.

Pilot's position in cockpit

Pilot's position in cockpit is comfortable and relaxing.

Carbon fibre wing spar

The carbon fibre spar has been successfully proof tested at 2.175 kgs each side. That gives a useable load factor
of +9 g and -7 g (with added safety factor of x 1.725).

Power plant

The König engine

The König SC-430 3-cylinder engine, used in the WINDEX 1200C is now manufactured in Canada.

With a displacement of 430 cc it gives a take off power of 20 hp at 4200 rpm. Weight of the König engine is 13.8 kg (30.4 lbs). Starting is electric and it uses gasoline of types 100LL, 80UL and mogas98.

Variable-pitch propeller unit

The variable-pitch propeller unit for the König engine has been built and successfully tested to JAR 22 standards.
The pilot control pitch from the cockpit, fine pitch to fully feathered.

The JAR tests include 50 hours running and 500 control movements with engine running. After that the propeller unit is dismantled, searched for damage, tolerances checked and finally function checked again. The unit has come through bench testing without problems.

Some Windex has flown over 300 engine hours without problems.

Propeller shaft power

Take-off distance