The Delage 12 CEDirs was a French racing aero-engine designed and built especially to power the

Kellner-Béchereau 28VD The Kellner-Béchereau 28VD was a French racing aircraft built to compete in the 1933 Coupe Deutsch de la Meurthe. Engine failure and damage sustained in the consequent emergency landing prevented the 28VD from participation in the race. Design ...

for racing in the 1933

Coupe Deutsch de la Meurthe The Coupe Deutsch de la Meurthe was an international aeronautical speed competition instituted on 25 August 1909 by the French oil magnate Henry Deutsch de la Meurthe. The race was reinstated three times through the years at the initiative of the ...

air races.

Design and development

The 12 CEDirs was an inverted 60° V-12 water-cooled engine with reduction gearing and two

Roots blower The Roots-type blower is a positive displacement lobe pump which operates by pumping a fluid with a pair of meshing lobes resembling a set of stretched gears. Fluid is trapped in pockets surrounding the lobes and carried from the intake si ...

superchargers.

Operational history

The 12 CEDirs was flown for the first time, in the 28VD, on 12 May 1933. Problems with propeller speed dogged the initial flights and are blamed for the crash of the 28VD on 14 May 1933. The propeller was over-speeding to a high degree, causing a cooling system rupture. With steam obscuring his view the pilot force-landed the 28 VD with nil visibility, destroying the aircraft but not causing serious injury to the pilot.

Applications

Specifications (12 CEDirs)

References

{{Reflist 1930s aircraft piston engines