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Piaggio P.XII

1930s Italian aircraft piston engine

Field	Value
name	P.XII
image	File:Piaggio P.XII, Museo dell'aria e dello spazio (San Pelagio, Due Carrare).JPG
caption	The Piaggio P.XII displayed at Museo dell'Aria e dello Spazio in San Pelagio, Due Carrare, Province of Padua
engine_type	Radial engine
national_origin	Italy
manufacturer	Piaggio
major_applications

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 3500 m) ;P.XII R.C.40: (geared, rated altitude 4000 m) ;P.XII R.C.100/2v: (geared, rated altitude 10000 m) ;P.XV R.C.60/2v: (geared, rated altitude 6000 m) ;P.XXII R.C.35D:Higher rating with slightly higher displacement than the P.XII series engines. (geared, rated altitude 3500 m) ;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 6000 m)

Applications

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

Specifications (P.XII R.C.35)

**Military: **1350 hp at 2,100rpm at 3500 m
**Cruising: **1000 hp at 1,700rpm at 3500 m |power/weight= 1.324 kW/kg (0.8 hp/lb)
Ignition: 2x Marelli AQ18 magnetos, 2 x spark plugs per cylinder fed by a shielded ignition harness.

References

Notes

Bibliography

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

References

Wilkinson, Paul H.. (1945). "Aircraft engines of the World 1945". Paul H. Wilkinson.

Info: Wikipedia Source

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