Eiri-Avion PIK-20

Eiri-Avion PIK-20

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Eiri-Avion PIK-20

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The PIK-20 is a Standard Class sailplane designed at the Helsinki University of Technology by Pekka Tammi, with advice from Ilkka Rantasalo and Raimo Nurminen. The prototype first flew in October 1973. It was produced initially by Molino Oy who were taken over by Eiri-Avion Oy between 1974 and 1980. Later, production was taken over by the French company, Siren SA, under the name Siren PIK-20.

The first models were notable for using flaps instead of air-brakes for approach control. The specification of the Standard Class required full air-brakes capable of keeping the speed below the maximum speed in a vertical dive. However at high speed great force was needed to lower the flaps and so a geared crank handle was used. At the time the PIK-20 conformed with the rules for Standard Class because the flaps could only be used for landing.

The first prototype finished 13th in the World Gliding Championships in Waikerie in January 1974 but it performed impressively. (The low placing was caused by a poor decision on the first day of the competition.) The glider was then produced at the rate of two to three per week.

The rules of the Standard Class were changed again to allow the flaps and ailerons to move together (flaperons) and for intermediate settings of the flaps between landing mode and zero. The result was the PIK-20B which won British,...
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