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| Myrsky | |
|---|---|
 AFinnish Air Force VL Myrsky II in 1944 | |
| General information | |
| Type | Reconnaissance,fighter |
| National origin | Finland |
| Manufacturer | Valtion lentokonetehdas |
| Designer |
|
| Primary user | Finnish Air Force(historical) |
| Number built | 51 |
| History | |
| Introduction date | 1943 |
| First flight | 23 December 1941 |
| Retired | 1947 (Finland) |
TheVL Myrsky ("Storm") is a FinnishWorld War II fighter aircraft originally developed byValtion lentokonetehdas for theFinnish Air Force. The models of the aircraft wereMyrsky I,Myrsky II, andMyrsky III.
It was designed by Edward Wegelius, Martti Vainio andTorsti Verkkola who worked at Valtion lentokonetehdas.
The decision to start developing a new fighter for the Finnish Air Force was based on experience gained before theWinter War: in the "arms race" leading up to a war, smaller nations can have difficulty purchasing top-of-the-line fighters without a significant political cost. The Finnish Air Force requested preliminary proposals for a domestic fighter from State Aircraft Factory (Valtion Lentokonetehdas) in early 1939, before the Winter War. State Aircraft Factory prepared five alternative proposals by May 1939. After that, The Ministry of Defence ordered the fighter design from State Aircraft Factory in June 1939.
The preliminary design was made by the aircraft-designer trio Arvo Ylinen (head of the design-bureau), Martti Vainio (aerodynamics), andTorsti Verkkola (structural design). Edward Wegelius was appointed head of the design department of the State Aircraft Factory when Ylinen later moved on to theHelsinki University of Technology in August 1940. VL did not appoint any main constructor to its products, such as the German aircraft manufacturers did.
Due to difficulties obtainingduraluminium, the wings were made out of plywood and the fuselage was metal structure with a fabric and plywood skin. The plannedBristol Taurus III engine was not available due to war, so aPratt & WhitneyR-1830 (civil Twin Wasp) was chosen. Availability of this engine was also problematic, so the first prototype used an R-1830-S3C3-G, while later prototypes and production fighters used less-powerful SC3-Gs. Finland bought these engines from German war booty stocks.
The firstMyrsky prototype flew on 23 December 1941.[1] The prototype was fully functional, but too heavy. After some modifications they soon had three new prototype aircraft. The test flights showed some structural problems during high-speed tests. All three prototypes were destroyed during test flights; two test pilots died, one was seriously injured. The culprit was found to beaeroelastic flutter, which was a poorly known phenomenon at the time. Resolving the flutter problem took almost a year.
Series production started in autumn 1942 far before German deliveries ofMesserschmitt Bf 109 had begun in 1943. The series production version was called theMyrsky II. 47Myrsky IIs were built and together with theMyrsky I version andMyrsky prototype the production amounted to 51 in all. Although the aircraft met the specifications set for it, it did not fulfill all expectations due to structural problems.
TheMyrsky III was ordered inspring 1943, but none were built.
Reconnaissance Squadron 12 received their firstMyrskys during August 1944. ThirtyMyrskys were delivered to Reconnaissance Squadrons 12 and 16 before the end of theContinuation War.
FifteenMyrsky fighters flew 68 missions during the Continuation War. During one mission, they met SovietYak-7s, but the fight ended without losses for either side. During two other missions,Myrskys damaged two Soviet fighters, which were both destroyed on landing. SixMyrskys took part in a bombing mission on 3 September 1944.
During theLapland War, sixMyrskys flew 13 reconnaissance missions during November 1944. The wooden construction proved problematic in this theatre, not enduring wet weather or cold well. The war timeLukkoglue, manufactured fromersatz materials, which was used for gluing the wooden parts, did not stand rain, frost and humidity, and the glue seams disintegrated, sometimes with disastrous results.
TenMyrskys were lost in accidents between 1943 and 1947 and four pilots died.Myrsky usage ended in May 1947 and the lastMyrsky flight was in February 1948.
TheMyrsky proved fast and manoeuvrable enough to dogfight the contemporary Soviet aircraft; it was the second fastest Finnish Air Force airplane after the Messerschmitt Bf 109G. Pilots liked the plane as it had good cockpit ergonomics and decent flight and ground handling properties. Its aerodynamic design was excellent, and was later used on theVL Pyörremyrsky fighter and theValmet Vihuri trainer. Its wide undercarriage gave it decent ground-handling properties. Its main drawback was the construction method: the substitute materials simply did not stand up to the harsh Finnish weather.
ThreeMyrsky fuselages and several parts have survived. TheFinnish Aviation Museum is currently (2023) restoring one of them (MY-14) into a complete museum aircraft. The project was on display at Finnish Air Force 100th anniversary air show atTikkakoski,Jyväskylä 16 to 17 June 2018. The aircraft will be on permanent display at theFinnish Air Force Museum by 2025.
Data from War Planes of the Second World War - Fighters Vol.1[2]
General characteristics
Performance
Armament
Avionics
Aircraft of comparable role, configuration, and era
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