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                   Finland

           VL Pyörremyrsky

VALTION_(VL)_PYORREMYRSKY-00.jpg

History:

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On November 26, 1942 the Finnish Air Force ordered two Pyörremyrsky prototypes to be built. The aircraft were to be ready by May 1944. One prototype was later cancelled and only one aircraft was ever built. The aircraft designation VMT Pyörremyrsky is also sometimes used, as the factory had been formed into the State Metal Factories (Valtion Metallitehtaat) during the construction of the aircraft. The Finnish Air Force airplane code letters PM gave the plane nickname Puu-Mersu (Wooden Messerschmitt), but the plane was an independent design.

 

The use of wood in the construction of the aircraft was maximised due to the sparseness of metals. The goal was to create a fighter with similar flight qualities to the German Messerschmitt Bf 109G. The engine and the propeller were taken from the Bf 109G. Thelanding gear was significantly widened and installed on the wing instead of fuselage in order to address one of the German fighter's most noteworthy shortcomings. This significantly eased ground control, as well as take off and landing.

The Pyörremyrsky prototype PM-1 made its first flight on November 21, 1945 at Härmälä, piloted by Esko Halme. After 25 minutes of flying, a piece from the hood fell off and Halme had to land when fumes from the engine started to enter the cockpit. The pilot was saved by his oxygen mask. The aircraft was to fly only three test flights in Tampere, the third time being a transfer flight to Kuorevesi on January 16, 1946. There it flew an additional 31 test flights, the total flight time being 27 hours by 1947. The aircraft was flown by eight pilots: Esko Halme, Lauri Hämäläinen, Erkki Itävuori, Osmo Kauppinen, Lasse Heikinaro, Martti Laitinen, Heikki Keso and Lauri Lautamäki. The last flight lasted only 20 minutes and was made by captain Osmo Kauppinen on July 22, 1947.

The Pyörremyrsky design was considered quite successful. It could outclimb the Bf 109G-6 and it was very manoeuvrable. It was considered almost ready for mass production. Its only major problem with the design was found to be the low-quality glue used in the joints.

The aircraft was still in the prototype stage when the war ended and this also meant that the funds allocated for the project decreased. The Pyörremyrsky prototype was grounded after only some 30 hours of flying and the programme terminated as no funds were available for the purchase of new aircraft for the Finnish Air Force and sufficient Bf 109Gs remained in service to equip the fighter force that was permitted under the Armistice terms.The PM-1 was removed from FAF lists on April 1, 1953. The wing construction was later used in another Finnish aircraft, the all-metal  Valmet Vihuri trainer.

 

Specifications

General characteristics:

Crew: One

Length: 9.13 m (29 ft 11 in)

Wingspan: 10.38 m (34 ft 1 in)

Height: 3.89 m (12 ft 9 in)

Wing area: 19.00 m² (204.5 ft²)

Empty weight: 2,619 kg (5,774 lb)

Loaded weight: 3,310 kg (7,297 lb)

Max. takeoff weight: 3,310 kg (7,300 lb)

Powerplant: 1 × Daimler-Benz DB 605 AC V-12, 1,100 kW (1,475 hp)

 

Performance:

Maximum speed: 620 km/h (385 mph)

Service ceiling: 11,250 m (36,900 ft)

Rate of climb: 18.5 m/s (3,640 ft/min)

Wing loading: 174 kg/ m² (35.7 lb sq ft)

 

Flight characteristics:

the maximum speed at sea level 522 km / h
the maximum speed at an altitude of 6000 meters of 620-645 km / h
cruising speed 380 km / h
time of climb of 5000 meters 4 min 30 sec
Flight duration 1.5 hours
service ceiling of 11,250 m

Armament:

Armament comprised one engine-mounted 20mm MG 151,

2×12.7 mm LKK/42 machine guns, provision being made for two 200kg bombs underwing. (proposed but not fitted to prototype)

 

pyorremyrsky-7.jpg

 

pyorremyrsky-3.jpg

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VL-Pyorremyrsky-1.jpg

 

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VALTION_%28VL%29_PYORREMYRSKY-01.jpg

 

 

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color version of an experienced fighter VL Pyörremyrsky

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Cockpit Pyorremyrsky

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pyorremyrsky-6.jpg

 

 

 

 

sources:

 

Edited by pieve
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  • Senior Suggestion Moderator

Open for discussion. :Salute:

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an experienced fighter VL Pyörremyrsky in the exposition of the Museum of Central Finland Aviation

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VL_Py%C3%B6rremyrsky_%28PM-1%29_Keski-Su

VALTION_%28VL%29_PYORREMYRSKY-04.jpg

VL_Py%C3%B6rremyrsky_%28PM-1%29_Keski-Su

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VL_Py%C3%B6rremyrsky_%28PM-1%29_Keski-Su

pm06.jpg

pm04.jpg

pm07.jpg

 

 

Edited by pieve
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i think we are all waiting for the international tree to come out someday.  However it would still make a great premium addition for the germans since its influenced by Messerschmitt 109. (And currently british tree has french planes for example so these type of additions are not new)

 

The plane had wide landing gear that made landing on rough surface easier. Also the very good climbing ability would be sweet for the game. Totally support this. +1

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Another *slightly* different 109 is not required. Cool back story, but the German line up already lacks variety

VL Pyörremyrsky would be a help to germany

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Another *slightly* different 109 is not required. Cool back story, but the German line up already lacks variety

This is just simply not true.

VL Pyörremyrsky started as a project to mimic the same performance as the BF 109. However when it was complete it was nothing like the Messerschmitt. Only the engine, propeller and main gun were the same type. Everything else was finnish design and the final product was very different from its role model the BF 109.

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  • Technical Moderator
Hm as a premium why not.
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  • 2 weeks later...
  • Technical Moderator

tier 3 premium

It outperforms the g6 in everything but speed. Tier 4 for sure.

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  • 4 weeks later...
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