FVM Ö1 Tummelisa
| Övningsflygplan 1 "Tummelisa" | |
|---|---|
 |
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| Carlson replica | |
| Role | Training aircraft |
| National origin | Sweden |
| Manufacturer | FVM (Flygkompaniets Tygverkstäder på Malmen) |
| Designer | Gösta von Porat and Henry Kjellson |
| First flight | June 1920 |
| Introduction | 1921 |
| Retired | 1935 |
| Primary user | Swedish Air Force |
| Number built | 28 plus a replica |
The FVM Ö 1 Tummelisa (Swedish for Thumbelina) is a single seat, single engine Swedish biplane from the 1920s. It was operated by the Swedish Air Force as its advanced trainer until the mid-1930s.
In 1919 Gösta von Porat was completing an advanced aeronautics course in France, part of which was a design study for an 80 hp (60 kW) single engine biplane. He returned to his native Sweden to lead the Swedish Army Telegraph Corps' Aviation Department, based near Linköping which had FVM as its workshop and passed on the rather incomplete set of diagrams and calculations to Henry Kjellson, an engineer there. Von Porat also made several 90 hp (67 kW) Le-Rhone-Thulin rotary engines, bought after the bankruptcy of the Thulin concern, available to Kjellson.
The result was the E.1, the factory name. The nickname Tummelisa, after the female partner of Tom Thumb, was widely used, though often shortened to Lisa. After the formation of the Swedish Air Force in 1926 the aircraft became officially known as the Ö 1. It is an all-wood single bay biplane, with equal span wings without stagger. The wings have simple parallel, interplane struts, assisted by flying wires and carry full-span ailerons only on the lower wing. There is a small trailing edge cut-out over the cockpit to improve the upward view. Its fuselage has a square section, with raised decking behind the cockpit. The Thulin A rotary engine has the usual incomplete cowling associated with this engine type, intended to restrict oil-spray. The Tummelisa has mainwheels on a fixed, single axle undercarriage, mounted via faired V-struts to the lower fuselage longerons, assisted by a tailskid and underwing wire loops. The broad chord tail surfaces have curved leading edges, with the tailplane mounted on top of the fuselage.
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