Mathis Vega 42

Émile E. C. Mathis had begun designing and producing motor-cars from 1910. Société Mathis Aviation, formed in 1937, began designing aircraft engines, initially with the large and complex Vega.

The Vega (and the similar Vesta) had a 2-piece Aluminium-alloy crankcase, 7 Aluminium-alloy cylinder blocks, with one-piece Aluminium-alloy heads and steel cylinder liners. A 6-throw crankshaft ran in 7 plain bearings.

Development continued after the war, culminating in the {{cvt|119.4|L|cuin}} {{cvt|5000|hp|order=flip}} Vesta 42, which did not reach the hardware stage before Mathis closed its doors.

The Vega engines were run on test-beds, and some sources indicate the engine was flown 100 hours in a test bed aircraft during 1939, but no details of flight testing survive.

;Vega 42A:Initial version of the engine first run in 1938, rated {{cvt|2300|hp|order=flip}} at 3,000 rpm. Two examples and a full-scale mock-up are reported to have been built.

;Vega 42B:An improved variant, under development in 1940. Completed and unfinished engines were hidden from invading German forces, in the Pyrenees.

;Vega 42D: An enlarged capacity version which became the Vesta 42.

;Vega 42E: Post WWII development rated at {{cvt|2800|hp|order=flip}} for take-off.

;Vesta 42: An enlarged Vega, developed from 1942, with similar configuration, but {{cvt|158|mm|2}} bore, {{cvt|145|mm|2}} stroke and {{cvt|119.4|L|cuin}} displacement, rated at {{cvt|5000|hp|order=flip}}.

{{pistonspecs|

|ref=Old Machine Press: Mathis Vega 42-Cylinder Aircraft Engine,{{cite web |last1=Pearce |first1=William |title=Mathis Vega 42-Cylinder Aircraft Engine |url=https://oldmachinepress.com/2018/12/05/6000/ |website=Old Machine Press |accessdate=5 December 2018 |language=en |date=5 December 2018}} Aircraft engines of the World 1946{{cite book |last=Wilkinson |first=Paul H. |title=Aircraft engines of the World 1946 |year=1946 |publisher=Sir Isaac Pitman & Sons Ltd. |location=London |edition=4th |pages=244–245}}

|type=42 cylinder in-line radial engine (6 7-cylinder banks)

|bore={{cvt|125|mm|2}}

|stroke={{cvt|115|mm|2}}

|displacement={{cvt|59.3|L|cuin}}

|length={{cvt|1520|mm|2}}

|diameter={{cvt|1070|mm|2}}

|width=

|height=

|weight={{cvt|1180|kg}}

|valvetrain=1 exhaust and 1 inlet valve per cylinder driven by 7x single overhead camshafts (SOHC)

|supercharger=Gear-driven single-stage driven at 5.53:1, with automatic boost control.

|turbocharger=

|fuelsystem=1x Zenith 160 2-barrel downdraught carburetor

|fueltype=100/130 Octane aviation gasolene

|oilsystem=Pressure feed at {{cvt|100|psi|order=flip}}, dry sump using {{cvt|25.1|cs}} viscosity oil

|coolingsystem=liquid-cooled

|power=Take-off:{{cvt|2800|hp|order=flip}} at 3,200 rpm at {{cvt|1.2|m}} +8.6lb boost

:::::Normal:{{cvt|2300|hp|order=flip}} at 3,000 rpm at {{cvt|2000|m}}

:::::Cruising:{{cvt|1700|hp|order=flip}} at 2,500 rpm at {{cvt|2000|m}}

|specpower={{cvt|0.77|hp/cuin|kW/L|order=flip}}

|compression=6.5

|fuelcon=

|specfuelcon={{cvt|0.48|lb/hp|kg/kW|3|order=flip}} per hour, cruising

|oilcon={{cvt|0.018|lb/hp|kg/kW|3|order=flip}} per hour, cruising

|power/weight={{cvt|0.93|lb/hp|kg/kW|order=flip}}

|designer=

|reduction_gear=Epicyclic bevel reduction gear at 0.42:1

|general_other=*Maximum Brake Mean Effective Power (b.m.e.p.) {{cvt|13.4|kg/cm2}}

|components_other=

|performance_other=

}}

{{aircontent

|see also=

|related=

|similar aircraft=

|lists=

}}

• Armstrong Siddeley Deerhound

{{Reflist}}

• {{cite book |last1=Bodemer |first1=Alfred |last2=Laugier |first2=Robert |title=les Moteurs à pistons aeronautiques français (1900/1960) vol.2 |publisher=Editions lariviere |isbn=978-2862482279 |edition=1st |date=1987 |language=French}}
• {{cite book |last1=Cuny |first1=Jean |last2=Raymond |first2=Danel |title=L'Aviation française de bombardement et de renseignement : 1918-1940 |date=1980 |publisher=Larivière |language=French}}
• {{cite journal |title=The Mathis 42E 00: A New French Six-bank In-line Engine of 4,000-5,000 h.p. |journal=Flight |date=6 September 1945 |volume=XLVIII |issue=1915 |page=257 |url=https://www.flightglobal.com/pdfarchive/view/1945/1945%20-%201774.html |accessdate=5 December 2018}}
• {{cite journal |title=Here and There: Mathis Multi |journal=Flight |date=3 May 1945 |volume=XLVII |issue=1897 |url=https://www.flightglobal.com/pdfarchive/view/1945/1945%20-%200849.html |accessdate=5 December 2018}}

• [https://sites.google.com/site/moteursmathis/ LES MOTEURS MATHIS]
• [https://ww2aircraft.net/forum/threads/mathis-vega-42-cylinder-french-aero-engine.49170/ WW2 AIRCRAFT.NET :MATHIS 'Vega' 42-Cylinder French Aero-Engine]

Category:Inline radial engines

Category:1930s aircraft piston engines

Category:Water-cooled radial engines