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  • VL Pyorremyrsky (Whirlwind) Fighter Prototype

    The VL Pyorremyrsky became a rare wartime Finnish aircraft development - only one flyable form was completed before the end.

     Updated: 7/15/2015; Authored By Staff Writer; Content ¬©www.MilitaryFactory.com

    The nation of Finland went to war twice with the Soviet Union during World War 2 (1939-1945). The first war came to be known as the "Winter War" and spanned from November 1939 into March of 1940 ending with the Moscow Peace Treaty favorable to the Soviets. From June of 1941 until September 1944, the pair went to war again, this time during the "Continuation War" which saw the Finns now aided by the Germans. It was during this period that Finnish authorities invested in a locally-designed, developed and produced fighter which came to be known as the VL Pyorremyrsky (or "Whirlwind" / "Hurricane").

    The original plan was to devise a fighter type that would make heavy use of locally-available materials, particularly wood. As such, precious metals would only be used where absolutely necessary. By this time, the Finns were also flying German Messerschmitt Bf 109 fighters and gained considerable operational experience with a high-performance and modern monoplane fighter.

    Finnish engineers developed a single-spar wing unit made of wood running through the fuselage. A steel tube frame made up the critical understructure of the aircraft while a plywood skinning technique was employed externally for a smooth, contoured finish. The resulting design was as sleek as any modern fighter of the period. The framed canopy marked the cockpit's position at midships with a raised dorsal spine running aft of the pilot to the base of the tail fin. The tail unit was conventional with a single vertical element featured along with low-set horizontal planes. Plywood was also used to cover the aft section which utilized a monocoque frame. The wing mainplanes were straight appendages and fitted forward of midships. A conventional "tail-dragger" undercarriage arrangement was used - though thought was put into widening the track of the main legs to remedy the shortcoming of the original German Bf 109 design. Ground running was therefore improved as was take off and landing actions. The available German Daimler-Benz DB 605AC 12-cylinder, liquid-cooled, inverted-Vee, inline piston engine of 1,475 horsepower was selected to power the airframe.

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    VL Pyorremyrsky (Whirlwind) Technical Specifications

    Service Year: 1945
    Type: Fighter Prototype
    National Origin: Finland
    Manufacturer(s): Valtion Lentokoneteehdas (VL) - Finland
    Production Total: 1

    Structural (Crew Space, Dimensions and Weights)

    Operating Crew: 1
    Length: 30.02 feet (9.15 meters)
    Width: 34.12 feet (10.40 meters)
    Height: 12.80 feet (3.90 meters)

    Weight (Empty): 5,776 lb (2,620 kg)
    Weight (MTOW): 7,297 lb (3,310 kg)

    Installed Power and Standard Day Performance

    Engine(s): 1 x Daimler-Benz DB 605AC 12-cylinder, liquid-cooled, inverted-Vee inline piston engine developing 1,475 horsepower.

    Maximum Speed: 385 mph (620 kph; 335 knots)
    Maximum Range: 513 miles (825 km)
    Service Ceiling: 36,909 feet (11,250 meters; 6.99 miles)
    Rate-of-Climb: 3,640 feet-per-minute (1,109 m/min)

    Armament / Mission Payload

    PROPOSED (Never Fitted):
    1 x 20mm MG 151 cannon firing through the propeller hub
    2 x 12.7mm heavy machine guns in wings.

    2 x 440lb conventional drop bombs underwing (one per wing).

    Global Operators / Customers

    Finland (cancelled)

    Model Variants (Including Prototypes)

    "Pyorremyrsky" - Base Project name

    PM-1 - Prototype Designation; one completed and flown in testing.