1. Design and development

2. Variants

3. Operators

4. Specifications (S.51/2)

5. See also

6. References

7. External links

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.^[1]

Design and development

Designed by André Herbemont, 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. Unlike earlier designs, the S.51 used metal construction for the wings.

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 Herbemont.^[2]

Variants

S.51

Prototype for French evaluation, 1x {{convert|380|hp|kW|abbr=on|disp=flip}} Gnome et Rhône 9Aa radial engine.^[3]

S.51/2

Refined version exported to Poland, 1x {{convert|420|hp|kW|abbr=on|disp=flip}} Gnome et Rhône 9Ab radial engine.^[4]

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 (Kościuszko) Squadron

{{flagu|Soviet Union|1924}}

• Soviet Air Force – One aircraft, used for tests and trials.

{{flagu|Spain|1931}}

• Spanish Republican Air Force^[4]

{{TUR}}

• Turkish Air Force

Specifications (S.51/2)

|crew=1
|length m=6.45
|span m=9.47
|height m=3.1
|wing area sqm=24.27
|aspect ratio=
|airfoil=
|empty weight kg=990
|gross weight kg=1360
|max takeoff weight kg=
|max takeoff weight lb=
|max takeoff weight note=
|fuel capacity=
|more general=

|eng1 number=1
|eng1 name=Gnome & Rhône 9Ab Jupiter
|eng1 type=9-cylinder air-cooled radial piston engine
|eng1 hp=420
|prop blade number=2
|prop name=fixed pitch propeller
|prop dia m=
|prop dia ft=
|prop dia in=
|prop dia note=

|max speed kmh=245
|max speed note=at {{cvt|100|m}}
|cruise speed kmh=
|cruise speed mph=
|cruise speed kts=
|cruise speed note=
|stall speed kmh=
|stall speed mph=
|stall speed kts=
|stall speed note=
|never exceed speed kmh=
|never exceed speed mph=
|never exceed speed kts=
|never exceed speed note=
|range km=
|range miles=
|range nmi=
|range note=
|combat range km=
|combat range miles=
|combat range nmi=
|combat range note=
|ferry range km=
|ferry range miles=
|ferry range nmi=
|ferry range note=
|endurance=
|ceiling m=
|ceiling ft=
|ceiling note=
|g limits=
|roll rate=
|glide ratio=
|climb rate ms=7.2
|time to altitude={{cvt|4000|m}} in 9 minutes
|wing loading kg/m2=52.6
|fuel consumption kg/km=
|fuel consumption lb/mi=
|power/mass={{cvt|0.14925|hp/lb|kW/kg|order=flip}}

|armament=2 × fixed, forward-firing {{cvt|7.7|mm|3}} Vickers machine-guns
}}

See also

• List of aircraft of the Spanish Republican Air Force
• List of Interwar military aircraft

References

External links

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