FVM Ö1 Tummelisa

FVM Ö1 Tummelisa
Pays	Suède
Rôle	Avion d’entraînement
Premier vol	Juin 1920
Construit	28

Lla FVM Ö 1 Tummelisa (Suédois pour Thumbelina) est un biplan suédois monoplace monomoteur des années 1920. Il a été exploité par l’armée de l’air suédoise en tant qu’entraîneur avancé jusqu’au milieu des années 1930.

Source: FVM Ö1 Tummelisa sur Wikipedia

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General Characteristics

The FVM Ö1 Tummelisa (Swedish for « Thumbelina ») is a light, single-seat biplane from the 1920s. It was the most well-known and successful aircraft designed by FVM (Flygkompaniets Tygverkstäder på Malmen), the Swedish Army Aviation’s workshop. The aircraft was developed for advanced training, particularly for prospective fighter pilots, and was praised for its agility, though it demanded skill due to the gyroscopic effect of its rotary engine. When the Swedish Air Force (Flygvapnet) was established in 1926, the type was officially designated Ö 1 (Övningsplan 1, or Advanced Trainer 1). Remarkably, it served until the mid-1930s without any fatal accidents.

Property	Typical Value (Ö 1)
Rôle	Advanced Trainer Aircraft
National Origin	Suède
Fabricant	FVM (Flygkompaniets Tygverkstäder på Malmen)
First Flight	Juin 1920
Retraite	1935
No. Built	~28–30
Crew	1 (Pilot)
Length	5.5 m (18 ft 1 in)
Envergure	7.8 m (25 ft 7 in)
Max Takeoff Weight	~535–552 kg (1,180–1,217 lb)

Powerplant and Performance

Engine: 1 x Thulin A 9-cylinder rotary engine (based on the Le Rhône).
Power Output: 67 kW (90 hp).
Propeller: 2-bladed.
Maximum Speed: 145–148 km/h (90–92 mph).
Service Ceiling: 5,000 m (16,000 ft).
Construction: Light wooden construction with wings and tail coated in linen fabric. The fuselage was covered in plywood.
Unique Feature: The rotary engine demanded special skill to compensate for the torque effect, making it an excellent, demanding advanced trainer.

Design and Legacy

Original Name: Initially known as « Tummeliten » (Little Tom Thumb), but pilots quickly nicknamed it « Tummelisa. »
Designers: Gösta von Porat and Henry Kjellson.
Operational Use: Served primarily at the Swedish Air Force Flight Academy (F 5) at Ljungbyhed.
Survivors: One original Ö 1 is preserved and displayed at the Flygvapenmuseum (Swedish Air Force Museum) in Linköping. At least one flying replica exists, built by Mikael Carlson.