Piaggio P.XI

Piaggio P.XI

Company type	Aircraft engine
Industry	Aerospace
Predecessor	Gnome-Rhône Mistral Major 14K (licensed design)
Products	14-cylinder radial aircraft engines

The Piaggio P.XI was an Italian 14-cylinder radial engine designed for aircraft use. This engine was produced under license in Italy, based on the French Gnome-Rhône Mistral Major 14K design.

Subsequent enhancements resulted in the creation of the P.XIX, which featured a higher compression ratio—increasing from 6:1 to 7:1—and an elevated maximum rpm from 2,400 to 2,600.

Variants

P.XI

P.XIbis

P.XI R.C.15

(geared, optimized for altitude 1,500 m (4,900 ft))

P.XI R.C.30

(geared, optimized for altitude 3,000 m (9,800 ft))

P.XI R.C.40D

P.XI R.C.40S

740 kW (1,000 PS) (geared, optimized for altitude 4,000 m (13,000 ft)), counter-rotating relative to 40D.

P.XI R.C.40bis

(geared, optimized for altitude 4,000 m (13,000 ft))

P.XI R.2C.40

740 kW (1,000 PS), (geared, optimized for altitude 4,000 m (13,000 ft)), equipped with a two-speed supercharger.

P.XI C.40

(direct drive, optimized for altitude 4,000 m (13,000 ft))

P.XI R.C.44

(geared, optimized for altitude 4,400 m (14,400 ft))

P.XI R.C.50

(geared, optimized for altitude 5,000 m (16,000 ft))

P.XI R.C.60

(geared, optimized for altitude 6,000 m (20,000 ft))

P.XI R.C.72

(geared, optimized for altitude 7,200 m (23,600 ft))

P.XI R.C.100

P.XI R.C.100/2v

(geared, optimized for altitude 10,000 m (33,000 ft))

Applications

• Breda Ba.65
• Breda Ba.88
• CANT Z.516
• CANT Z.1007
• Caproni Ca.135
• Caproni Ca.161
• Reggiane Re 2000
• Saab 17C
• (Savoia-Marchetti SM.79B)
• Savoia-Marchetti SM.84

Specifications (P.XI R.C.40)

{{pistonspecs| |ref=Italian Civil & Military Aircraft 1930-1945 and Aircraft Engines of the World 1945. |type=14-cylinder radial engine |bore =146 mm (5.7 in) |stroke =165 mm (6.5 in) |displacement =38.6 L (2,360 cu in) |length=1,700 mm (67 in) |diameter=1,328 millimetres (52.3 in)

References

Bibliography

• Gunston, Bill. World Encyclopedia of Aero Engines. Cambridge, England. Patrick Stephens Limited, 1989. ISBN 1-85260-163-9