# Pavesi P4

The Pavesi P4 was an artillery tractor produced in Italy in 1918 by Ugo Pavesi. It was the first 4-wheel drive tractor developed in Italy, as well as Italy's first articulated tractor.

## History and civilian versions

The La Moto Aratrice Pavesi-Tolotti company began development of the P4 in 1913, which was slowed by World War I, so that it wasn't available for demonstration until 1918. After proving itself in tests in muddy fields around Rome, the P4 took part in different competitions and demonstrations in the 1920s, many of which were attended by the royal family of the House of Savoy and Benito Mussolini. The base model P4 used a 15-20 hp engine, the P4M utilized a 40 hp engine, and the P4S featured a 25 hp engine. These were produced until the 1930s by Pavesi's new company, La Motomeccanica Brevetti Ing. Pavesi.

## Military versions

Although agile, the P4 was also expensive (45,000 lire compared to 27,000 lire for a conventional tractor) and difficult to maintain. While this made it unpopular with many small farmers, the Royal Italian Army took great interest in the tractor. In 1923 a modified, militarized version (the Modello 25) won a competition organized by the Ministero della guerra [it] for a heavy artillery tractor. The Regio Esercito was unable to afford the Modello 25 at the time, but 60 were sold to Spain from between 1923 and 1925. The Modello 25 was eventually adopted by Italy in 1925. 1,000 units (over a period of four years) of the improved version, the Modello 26, were produced by Fiat (as the Pavesi company was unable to meet the demand) for towing artillery pieces. An improved model, the Modello 30, was produced in 1930/1931. Production of the Modello 30A (differing from the 30 by using dynamo powered lights) started in 1934. By September 1937, Italian Army units had received 2,300 Model 26, 30, and 30A tractors with another 270 on order, with production stopping in 1938. These tractors served from the Second Italo-Ethiopian War through World War II, and were used extensively in the North African campaign. The militarized P4 models were eventually replaced in service by the SPA TM40 [it].

## Foreign operators

In the United Kingdom, Armstrong Whitworth obtained a license to produce the P4 which was passed on to Armstrong Siddeley. The Mechanical Warfare Experimental Establishment was uninterested in using this design so it was not developed any further. In France, the P4 was marketed as the Agrophile-Pavesi by the Société Auxiliaire Agricole. Weiss Manfréd Acél és Fémművek in Hungary manufactured a licensed version of the P4, and in 1935 Greece purchased 224 of the tractors from FIAT, which were used to tow Schneidere 105mm and 150mm howitzers. Sweden licensed the P4 as the Kanontraktor m/28, built by NOHAB Industri AB in Trollhättan, and the German Wehrmacht made use of the tractors starting in September, 1939.

## Specifications

Civilian Models :
| Model | P4 | P4S | P4M |
| Engine | 2 cylinder gasoline, 4520 cm$^3$, 15-20 hp at 900 rpm | 2 cylinder gasoline, 4520 cm$^3$, 25 hp at 900 rpm | 4 cylinder gasoline, 4700 cm$^3$, 40 hp at 1300 rpm |
| Maximum speed | 7.8 km/h | 7.8 km/h | 10.7 km/h |
| Forward/reverse gears | 2/2 | 2/2 | 3/1 |
| Length | 3.3 m | 3.3 m | 3.5 m |
| Width | 1.9 m | 1.9 m | 1.9 m |
| Weight | 2500 kg | 2500 kg | 3300 kg |
Military Models :
| | Modello 26 | Modello 30A |
| Length | 4100 mm | 4115 mm |
| Wheelbase | 2420 mm | 2420 mm |
| Width | 2050 mm | 2050 mm |
| Height | 1850 mm (without tarp), 2400 mm (with tarp) | 1850 mm (without tarp), 2400 mm (with tarp) |
| Ground clearance | 480 mm | 480 mm |
| Unladen weight | 4680 kg | 4780 kg |
| Crew | 8 | 8 |
| Payload | 1000 kg | 1000 kg |
| Max. towing load | 3800 kg | 3800 kg |
| Max. speed (on-road) | 22 km/h | 22 km/h |
| Range | 280 km | 265 km |
| Fuel capacity | 75 + 30 l | 75 + 26 l |
| Engine | 4-cylinder P4/100, 52 hp at 1500 rpm | 4-cylinder P4/100, 57 hp at 1800 rpm |