Polikarpov I-1

__NOTOC__ Infobox Aircraft
name=Polikarpov I-1


caption=
type=Monoplane fighter
national origin=USSR
manufacturer=Polikarpov
designer=
first flight=1923
introduced=
retired=
status=
primary user=Soviet Air Force
more users=
produced=
number built=32
variants with their own articles=The Polikarpov I-1 (developed from the IL-400 [cite web|url=http://www.onairpower.org/docs/IL-400b|title=IL-400b|accessdate=2008-08-29|format= |work=OnAirpower.org] and IL-400b [cite web|url=http://www.onairpower.org/docs/IL-400|title=IL-400|accessdate=2008-08-29|format= |work=OnAirpower.org] prototypes) was the first home-produced Soviet monoplane fighter.

Development

The I-1 (I = "Istrebitel" or fighter) was a single-seat cantilever low-wing monoplane fighter of mixed construction, built mainly from wood it had aluminium alloy covering on the tailplane, forward part of the wings and the vertical tail.

First flown in 1923, the initial prototype was known as the IL-400 due to the nose-mounted 400hp (198kW) Liberty engine. Following a crash during the first flight it was rebuilt with a redesigned tailplane and wing becoming the IL-400b prototype. After testing of the IL-400b, 33 production aircraft were ordered under the designation I1-M5 (later simplified to I-1) [cite web |url=http://www.onairpower.org/docs/I-1|title=I-1|accessdate=2008-08-29|format=|work=OnAirpower.org] , although the production and prototype aircraft differed with minor design changes. The I-1 was prone to unintentional spinning and in June 1927 a pilot saved himself from an out-of-control aircraft to make one of the first recorded parachute escapes in the Soviet Union. The aircraft never entered operational service and only 18 were produced.

Operators

;USSR
*Soviet Air Force

pecifications

aerospecs
ref=
met or eng?= met

crew=1
capacity=
length m=
length ft=
length in=
span m=10.80
span ft=35
span in=5¼
swept m=
swept ft=
swept in=
rot number=
rot dia m=
rot dia ft=
rot dia in=
dia m=
dia ft=
dia in=
width m=
width ft=
width in=
height m=
height ft=
height in=
wing area sqm=
wing area sqft=
swept area sqm=
swept area sqft=
rot area sqm=
rot area sqft=
volume m3=
volume ft3=
aspect ratio=
empty weight kg=
empty weight lb=
gross weight kg=1510
gross weight lb=3329
lift kg=
lift lb=

eng1 number=1
eng1 type=Liberty L-12 piston engine
eng1 kw= 298
eng1 hp= 400
eng1 kn=
eng1 lbf=
eng1 kn-ab=
eng1 lbf-ab=
eng2 number=
eng2 type=
eng2 kw=
eng2 hp=
eng2 kn=
eng2 lbf=
eng2 kn-ab=
eng2 lbf-ab=

max speed kmh=264
max speed mph=164
max speed mach=
cruise speed kmh=
cruise speed mph=
range km=
range miles=
endurance h=
endurance min=
ceiling m=
ceiling ft=
glide ratio=
climb rate ms=
climb rate ftmin=
sink rate ms=
sink rate ftmin=

armament1=2 x synchronised 7.7mm (0.303in) PV-1 machine guns.
armament2=
armament3=
armament4=
armament5=
armament6=

ee also

aircontent
see also=
related=
similar aircraft=
sequence=
lists=
*List of military aircraft of the Soviet Union and the CIS

References

*
*cite book |last= |first= |authorlink= |coauthors= |title= The Illustrated Encyclopedia of Aircraft (Part Work 1982-1985)|year= |publisher= Orbis Publishing|location= |issn=