Piaggio P.32

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The Piaggio P.32 was an Italian medium bomber of the late 1930s, produced by Piaggio, and designed by Giovanni Pegna.

It was a modern design for its time, but was a failure due to lack of powerplants commensurate with its high wing loading.

Design

The P.32 was a twin-engine monoplane with a crew of five or six.

The main structure was of wood, with a glazed nose, low cockpit, twin tail-fins, and a distinct 'banana' shape in the fuselage.

It was armed with a dorsal turret with two 7.7 mm (.303 in) machine guns, a ventral turret and a single machine gun in the nose, and it could carry a 1,600 kg (3,500 lb) bombload.

Utilizing their experience of designing experimental and record-breaking aircraft like the Piaggio P.16, Piaggio P.23M, and Piaggio P.23R, Piaggio designed the P.32 with very small wings for its size.

This meant a high wing loading, which required Handley-Page leading edge slats and double trailing-edge flaps to provide enough lift at takeoff and landing.

Development

The development of this aircraft began with the contest announced by the Regia Aeronautica (Italian Air Force) in 1934. The P.32 was one of many contenders, and the most modern.

The prototype first flew in 1936, and was tested at Guidonia, leading to an order for 12 aircraft, followed by a second order for five.

These aircraft were fitted with the 615 kW (825 hp) Isotta-Fraschini Asso XI.RC inline V12 engine, and were designated the P.32 I.

In early 1937, the P.32 Is were assigned to XXXVII Gruppo BT, 18 Stormo.

The advanced wing design meant that they could only be flown by specially-trained crews, but the aircraft was found to be fatally underpowered, with a maximum speed of only 386 km/h (240 mph), and then only with no bombs or defensive weapons carried.

They were unable to fly on only one engine, and their handling qualities were inferior to the SM.79 and BR.20.

The P.32 II, fitted with more powerful 750 kW (1,000 hp) Piaggio P.XI RC 40 radial engines was tested, and 12 were delivered in early 1938.

The more powerful engines gave a better rate of climb, but the increased weight meant there was no improvement in maximum speed, while the range dropped from 1,950 km (1,200 mi) to 1,700 km (1,100 mi) because of higher fuel consumption.

The P.32 Bis was a redesign that brought the empty weight of the aircraft down from 6,355 kg (14,010 lb) to 5,700 kg (12,600 lb) by reducing its overall size slightly.

This gave it a top speed of 378 km/h (235 mph) and a ceiling of 6,300 m (21,000 ft) with the Isotta-Fraschini Asso XI engines, and 420 km/h (260 mph) and a ceiling of 8,000 m (26,200 ft) with the Piaggio P.XI RC 40 engines.

However, the prototype crashed on 25 February 1938, killing the test pilot, leading to the cancellation of further development.

The P.32 Is and IIs were taken out of service in April 1938 and were used as training aircraft. In 1939, a P.32 crashed, killing the entire crew.

There is no further information about the fate of the remaining aircraft, and most likely they were scrapped soon afterwards

Variants

P.32 I

With 615 kW (825 hp) Isotta-Fraschini Asso XI.RC inline V12 engines.

P. 32 II

With 750 kW (1,000 hp) Piaggio P.XI RC 40 radial engines.

Caproni Ca.405 Procellaria

A version built by Caproni specifically for the Istres-Damascus-Paris Air Race of 1937, but not completed in time.

P.32 Bis

A redesign built by Caproni-Reggiane (as the Ca.400).
Tested with both types of engine. One prototype built.

CA 405

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P 32 Bis

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Operators

Italy

Regia Aeronautica

Specifications (P.32 I)

General characteristics

Crew: 5/6

Length: 16.3 m (53 ft 6 in)

Wingspan: 18 m (59 ft)

Height: 5.1 m (16 ft 9 in)

Wing area: 60 m² (645.6 ft²)

Empty weight: 6,355 kg (13,981 lb)

Max. takeoff weight: 9,355 kg (20,581 lb)

Powerplant: 2 × Isotta-Fraschini Asso XI.RC40 V12 inline engines, 615 kW (825 hp) each

Performance

Maximum speed: 386 km/h (208 kn, 240 mph)

Range: 1,950 km (1,053 nmi, 1,212 mi)

Service ceiling: 7,250 m (23,780 ft)

Climb to 5,000 m (16,400 ft) : 19 min 54 sec.

Armament

5 × 7.7 mm (0.303 in) Breda-SAFAT machine guns

1,600 kg (3,500 lb) of bombs