Pi-Pi (oz8140)

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Pi-Pi (oz8140) by PC Koorn 1952 - plan thumbnail

About this Plan

Pi-Pi (Pipi). Tandem wing towline glider model.

Quote: "EARLY in 1948, just three days before the first national meeting in Holland for unorthodox gliders, I decided to build a tandem wing glider. I already had a pair of suitable wings and designed Pipi round them, the model being completed within two days.

The purpose of the meeting was to select the Dutch team to compete in the tailless contest at Lyons in France, and I had a busy day flying my two tailless models into 1st and 3rd places, while in the tandem event my brand new model was placed second. A few weeks later Pipi established a Dutch hand-launch record, with a flight of 1 min 30 sec.

The model performed very well during 1949, eventually setting up a new Dutch tandem-wing record with a distance of 15 km (6 min OOS), and nearly beating the tandem towlaunch record which was 8 min.

Pipi disappeared this year, and I have had no time to build another as I am in the Royal Dutch Navy and there is plenty of work to do.

Building: Building is very easy and even a beginner will be able to make a good simple tandem, capable of flights of 1 min or more from a 150 ft towline, without thermals.

Begin by making the wing and tailplane ribs and the fuselage formers. As the fuselage sides are parallel for their whole length, all formers will be 1-9/16 in wide. Place the bottom longerons on the building board and cement the formers in place. When they are dry install the wing tongue and noseblock. Steam the top longerons to shape and cement to the formers. Be very careful with the construction of the tailplane rests (R), and do not forget the anchoring dowels. The towhooks are cut out and cemented to the 1/16 ply which forms the bottom of the fuselage..."

Update 28/10/2016: Replaced this plan with a cleaner copy (patterned background removed) thanks to rchopper56.

Supplementary file notes

Article page. Also, previous scan version.

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Pi-Pi (oz8140) by PC Koorn 1952 - model pic

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