Piaggio Stella P.VII
Piaggio Stella P.VII | |
---|---|
Type | Air cooled radial |
National origin | Italy |
Manufacturer | Piaggio |
Designer | Renzo Spolti |
First run | 1933 |
Major applications | Caproni Ca.113 Caproni Ca.133 Caproni Ca.310 |
ThePiaggio Stella P.VIIwas the first P series aircraft engine produced byRinaldo Piaggio S.p.A.Based on its experience license-producing theGnome-Rhône 7K,Piaggio sold the engine to be used on a wide range of Italian aircraft before and duringWorld War II,including the record-breakingCaproni Ca.133.
Development
[edit]Having built engines under licence fromGnome et Rhône,Piaggio designed a seven-cylinder radial using the same principles.[1]The engine, named P.VII for its seven cylinders, was one in a series of radial engines produced by Piaggio initially namedStella,meaning star.[2]The engine was first run in 1933 and was produced in many models.[3]One notable version was the P.VII Z which was fitted with a floatless Piaggio AS80 carburettor for aerobatic flight. It powered the Caproni Ca.133 flown byRenato Donatithat, in 1933, broke the record for the longest duration in inverted flight.[2]
Variants
[edit]- P.VII C.15
- Supercharged, rated at 331 kW (444 hp) at 1,500 m (4,900 ft); first flew 1933
- P.VII C.16
- Supercharged, rated at 338 kW (453 hp) at 1,600 m (5,200 ft); first flew 1934
- P.VII C.16/35
- P.VII C.35
- Supercharged, rated at 338 kW (453 hp) at 3,500 m (11,500 ft); first flew 1935
- P.VII C.40
- Supercharged, rated at 287 kW (385 hp) at 4,000 m (13,000 ft); first flew 1935
- P.VII C.45 / 2v
- Two speed supercharged, rated at 287 kW (385 hp) at 4,500 m (14,800 ft); first flew 1935
- P.VII R.C.10
- Supercharged and geared, rated at 1,000 m (3,300 ft).
- P.VII R.C.35
- Supercharged and geared, rated at 368 kW (493 hp) at 3,500 m (11,500 ft); first flew 1938
- P.VII R.C.45
- Supercharged and geared, rated at 287 kW (385 hp) at 4,500 m (14,800 ft) first flew 1935
- P.VII Z
- Normally aspirated, designed for acrobatic aircraft, rated at 272 kW (365 hp), first flew 1933
Applications
[edit]- Breda Ba.28
- Caproni Ca.101
- Caproni Ca.113
- Caproni Ca.133
- Caproni Ca.148
- Caproni Ca.310
- Caproni Ca.311
- Caproni Ca.316
- Hispano HS-42
- IMAM Ro.41
- North American Sk.14A
- Savoia-Marchetti S.71
- Savoia-Marchetti SM.85
Specifications (C.35)
[edit]Data fromS.A. Piaggio e.C. (1939).Instruzione per l’uso del motore P VII C 35 – D P VII C 35 – S.Rome: Ministero dell’Aeronautica.Retrieved29 August2018.
General characteristics
- Type:7-cylinder, single row, air cooledradial engine
- Bore:146 mm (5.7 in)
- Stroke:165 mm (6.5 in)
- Displacement:19.337 L (1,180 in3)
- Length:1,050 mm (41 in)
- Diameter:1,235 mm (48.6 in)
- Dry weight:295 kg (650 lb)
Components
- Valvetrain:2 xoverhead valvesper cylinder operated by rockers and pushrods
- Supercharger:Centrifugal compressor
- Fuel type:87Octanepetrol
- Cooling system:Air-cooled
Performance
- Power output:
- Take-off:368 kW (493 hp) at 2100 rpm
- Cruise:338 kW (453 hp) at 2100 rpm at 3,500 m (11,483 ft)
- Compression ratio:5.5:1
- Specific fuel consumption:292 g/(kW•h) (0.48 lb/(hp•h)) at 1900 rpm
- Oil consumption:9.5 g/(kW•h) (0.015 lb/(hp•h)) at 1900 rpm
See also
[edit]Comparable engines
Related lists