View source for VL Pyry

{{Short description|1930s Finnish military trainer aircraft}}
<!-- This article is a part of [[Wikipedia:WikiProject Aircraft]]. Please see [[Wikipedia:WikiProject Aircraft/page content]] for recommended layout. -->
{{Infobox aircraft
  |name = Pyry
  |image = VL Pyry.JPG
  |caption = VL Pyry at the [[Finnish Aviation Museum]]
  |type = Reconnaissance/fighter
  |manufacturer = [[Valtion lentokonetehdas]]
  |designer = 
  |first_flight = 29 March 1939
  |introduction = 1941
  |retired = 7 September 1962
  |number_built = 41
  |status =Retired
  |unit cost =
  |variants =
  |primary_user =[[Finnish Air Force]]
  |more_users = 
}}
'''VL Pyry''' ([[Finnish language]] for ''[[blizzard]]'') was a [[Finland|Finnish]] low-winged, two-seated fighter trainer aircraft, built by the State Aircraft Factory (''[[Valtion lentokonetehdas]]'') for use with the [[Finnish Air Force]]. The Pyry was in use from 1939 to 1962. The aircraft was a mixed construction of wood, steel, fabric, and duraluminium.<ref>{{cite web | url=https://modelingmadness.com/scott/axis/previews/az/az7228.htm | title=AZmodels 1/72 V.L. Pyry "post war", previewed by Scott van Aken }}</ref>

==History==
In 1937 a prototype, the '''VL Pyry I''', with the identification number PY-1, was ordered by the Finnish Air Force. It was designed by Martti Vainio, [[Torsti Verkkola]], and [[Edward Wegelius]], with [[Arvo Ylinen]] being the chief designer. The PY-1s first flight was on 29 March, 1939. 40 aircraft were ordered in May of 1940 and were delivered in 1941. They were given the name '''VL Pyry II''', with the ID designations of PY2-PY41.<ref>{{cite web | url=https://modelingmadness.com/scott/axis/previews/az/az7228.htm | title=AZmodels 1/72 V.L. Pyry "post war", previewed by Scott van Aken }}</ref><ref>{{cite web | url=http://www.letletlet-warplanes.com/2019/02/16/vl-pyry/ | title=VL Pyry – Let Let Let – Warplanes | date=16 February 2019 }}</ref> The Air Force School in [[Kauhava]] was the first unit to receive the new aircraft. Around 700 pilots were trained in the aircraft and the type accumulated over 56,000 flying hours over a service life of 20 years. PY-1 and PY-27 made the final official flights of this series in [[Härmälä]] on 7 September 1962.<ref>{{cite web | url=https://modelingmadness.com/scott/axis/previews/az/az7228.htm | title=AZmodels 1/72 V.L. Pyry "post war", previewed by Scott van Aken }}</ref>

The plane was tricky to fly, and shown to be unstable and prone to wingtip stalls. In an attempt to fix the wingtip stall issue, four Pyrys (PY-1, -24, -32 and -37) were equipped with trapezoidal wings, as well as serving to test these structures for the [[VL Myrsky]]. While these new wings did reduce the risk of stalls, they made the aircraft even more unstable than before. In 1942 all planes were grounded to fix a problem with horizontal stabilizer struts breaking, and the original struts were replaced with V struts, resulting in a more tail-heavy aircraft. To improve stability, the engine mount was lengthened by 16.5cm in 1944, but it was still a difficult plane to fly for inexperienced pilots. It was said if a cadet learned to fly on Pyry, he would later master just any kind of aircraft.

There were 28 accidents of VL Pyry. All together 27 pilots died. The first accident was on 15 June 1941 in Hyvinkää. Pilot Kauno Osmo Meriluoto died. <ref>“Kohtalokkaat lennot 1939-1944” (Fateful Flights) by Jaakko Hyvönen. Publisher: Kustantaja Apali Oy, 2001, {{ISBN|951-9445-34-X}}</ref>

The aircraft's final flights were made by PY-1 and PY-27 September 6, 1962.

==Surviving aircraft==
* The PY-1 prototype can be found at the Kauhava Aircraft Park.
* PY-27 is at the [[Finnish Aviation Museum]] in Vantaa.
* PY-35 at the [[Finnish Air Force Museum]] in Tikkakoski. 
* The remains of PY-5 are at the Finnish Air Force Museum in Tikkakoski.
* The remains of PY-26 are at the Päijänne Tavastia Aviation Museum in Asikkala.

==Operators==
;{{FIN}}:[[Finnish Air Force]]

==Specifications (VL Pyry II)==
{{Aircraft specs
|ref=<ref name=menstream>{{cite web|title=VL Pyry|url=http://menstream.pl/lotnictwo/vl/vl;pyry,1400.html|website=menstream.pl|access-date=22 November 2014|location=Warsaw|language=pl}}</ref>
|prime units?=met
<!--
        General characteristics
-->
|crew=2
|length m=7.7
|span m=9.8
|height m=2.55
|wing area sqm=12.7
|aspect ratio=<!-- sailplanes -->
|airfoil=
|empty weight kg=1045
|gross weight kg=1535
<!--
        Powerplant
-->
|eng1 number=1
|eng1 name=[[Wright R-975-E3 Whirlwind]] 
|eng1 type=nine-cylinder air-cooled radial piston engine
|eng1 hp=450
|eng1 note= at 2,250 rpm for take-off
|prop blade number=2
|prop name= variable-pitch propeller
|prop dia m=<!-- propeller aircraft -->
|prop dia ft=<!-- propeller aircraft -->
|prop dia in=<!-- propeller aircraft -->
|prop dia note=
<!--
        Performance
-->
|max speed kmh=330
|cruise speed kmh=286
|range km=1050
|ceiling m=5600
|climb rate ms=5
|time to altitude={{convert|1000|m|ft|abbr=on}} - 2 minutes 28 seconds
*:{{convert|2000|m|ft|abbr=on}} - 5 minutes 7 seconds
*:{{convert|3000|m|ft|abbr=on}} - 8 minutes 27 seconds
*:{{convert|4000|m|ft|abbr=on}} - 12 minutes 43 seconds
*:{{convert|5000|m|ft|abbr=on}} - 20 minutes 10 seconds
|wing loading kg/m2=120.87
|power/mass=0.201 kW/kg (0.068 hp/lb)
<!--
        Armament
-->
|guns= 1x {{convert|7.7|mm|in|abbr=on|3}} [[Browning machine gun]] with 480 rounds
}}

==References==
{{reflist}}

==External links==
{{commons category-inline|VL Pyry}}

{{Valtion lentokonetehdas aircraft}}

{{DEFAULTSORT:Vl Pyry}}
[[Category:1940s Finnish military aircraft]]
[[Category:Single-engined tractor aircraft]]
[[Category:Low-wing aircraft]]
[[Category:Aircraft first flown in 1939]]
[[Category:Aircraft with fixed conventional landing gear]]
[[Category:Single-engined piston aircraft]]
[[Category:Valmet aircraft|Pyry]]