Blériot-SPAD S.51

__NOTOC__ Infobox Aircraft
name=S.51


caption=
type=Fighter
manufacturer= Blériot
designer= André Herbémont
first flight= 16 June 1924
introduced=
retired=
status=
primary user=Polish Air Force
more users=Turkish Air Force Soviet Air Force
produced=
number built= ca. 60
variants with their own articles=The Bleriot-SPAD S.51 was a French fighter aircraft developed in 1924 in response to a French Air Force requirement for an aircraft to replace their obsolete Nieuport-Delage NiD.29s.

Design and development

Designed by André Herbémont, the S.51 shared its basic configuration with his other aircraft of the period, being a biplane with a swept upper wing and unswept lower wing, joined by I-shaped interplane struts. The S.51, however, marked Herbémont's transition from a covered framework fuselage design to a monocoque fuselage.

The prototype S.51 was rejected by the French authorities, but revised versions found export customers in the Polish Air Force, which bought 50 of them, and the Turkish and Soviet air forces which each bought a single example. Another development, the S.51/3 was experimentally fitted with the first controllable pitch propeller developed in France, also designed by Herbémont.

Variants

;S.51/1:Prototype for French evaluation.;S.51/2:Refined version exported to Poland.;S.51/3:Prototype with variable-pitch propeller.;S.51/4:Export version for Turkey and the USSR with two extra machine guns in the wings.

Operators

;POL
*Polish Air Force
** 11th (Kosciusko) Squadron;flag|Soviet Union|1923
*Soviet Air Force;TUR
*Turkish Air Force

pecifications (S.51/2)

aerospecs
met or eng?= met

crew=one pilot
capacity=
length m=6.45
length ft=21
length in=2
span m=9.47
span ft=31
span in=1
dia m=
dia ft=
dia in=
height m=3.10
height ft=10
height in=2
wing area sqm=24.0
wing area sqft=258
rot area sqm=
rot area sqft=
aspect ratio=
empty weight kg=990
empty weight lb=2,182
gross weight kg=1,360
gross weight lb=2,998

eng1 number=1
eng1 type=Gnome et Rhône-built Bristol Jupiter IV radial engine
eng1 kw= 313
eng1 hp= 420
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=230
max speed mph=143
max speed mach=
cruise speed kmh=
cruise speed mph=
range km=
range miles=
endurance h=
endurance min=
ceiling m=9,000
ceiling ft=29,530
glide ratio=
climb rate ms=7.2
climb rate ftmin=1,425
sink rate ms=
sink rate ftmin=

armament1=2 × fixed, forward-firing .303 Vickers machine guns
armament2=
armament3=
armament4=
armament5=
armament6=

References

*
*
* [http://www.aviafrance.com/142.htm aviafrance.com]

ee also

aircontent

related=

similar aircraft=

sequence=
* ← S.46 - S.48 - S.50 - S.51 - S.54 - S.56 - S.58 →

lists=

see also=