FVM Ö1 Tummelisa

FVM Ö1 Tummelisa
Land	Zweden
Role	Opleidingsvliegtuigen
Eerste vlucht	juni 1920
Gebouwd	28

De FVM Ö 1 Tummelisa (Zweeds voor Duimelijn) is een eenzits, eenmotorige Zweedse tweedekker uit de jaren 1920. Het werd geëxploiteerd door de Zweedse luchtmacht als zijn geavanceerde trainer tot het midden van de jaren 1930.

Bron: FVM Ö1 Tummelisa op 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)
Role	Advanced Trainer Aircraft
National Origin	Zweden
Fabrikant	FVM (Flygkompaniets Tygverkstäder på Malmen)
First Flight	juni 1920
Voormalig	1935
No. Built	~28–30
Bemanning	1 (Pilot)
Lengte	5.5 m (18 ft 1 in)
Spanwijdte	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.

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