Piaggio P.XII explained

The Piaggio P.XII is an Italian 18-cylinder radial aircraft engine developed in the 1930s by Rinaldo Piaggio S.p.A. The P.XII was two Piaggio P.X engines in tandem, which were versions of the French Gnome-Rhône 9K Mistral made under license, themselves being much modified Gnome-Rhône 9A - a license-built Bristol Jupiter.

The engine was used in some Italian aircraft from 1940 until the end of World War II, especially the Piaggio P.108. An up-rated version was tested as the Piaggio P.XXII.

Variants

Variants of the Piaggio P.XII include:(R - Riduttore - reduction gearing and C - Compressore - supercharged)

P.XII R.C.35: (geared, rated altitude 3500m (11,500feet))

P.XII R.C.40: (geared, rated altitude 4000m (13,000feet))

P.XII R.C.100/2v: (geared, rated altitude 10000m (30,000feet))

P.XV R.C.60/2v: (geared, rated altitude 6000m (20,000feet))

P.XXII R.C.35D:Higher rating with slightly higher displacement than the P.XII series engines. (geared, rated altitude 3500m (11,500feet))

P.XXII R.C.35R:Same as P.XXII R.C.35D, but propeller rotates in opposite direction

P.XXII R.C.60: (geared, rated altitude 6000m (20,000feet))

Applications

• CANT Z.1015
• CANT Z.1018
• CANT Z.511
• Caproni Ca.169
• Piaggio P.108
• Savoia-Marchetti SM.84
• Savoia-Marchetti SM.89

References

Bibliography

• Gunston, Bill. World Encyclopedia of Aero Engines. Cambridge, England. Patrick Stephens Limited, 1989.
• Wilkinson, Paul H.. Aircraft Engines of the World. 1941