Austin K30 (1938)
Produced 1938-45. c4,500
The Austin K30 is a rare British 30-cwt (1.5-ton) 4x2 general service (GS) military truck produced by Austin Motor Company from 1939 to 1945. It was derived from civilian truck designs, under the same name, the K30 served as the baseline chassis for the famous Austin K2/Y Ambulance as well as general logistics and troop transport. Powered by a 3.46-litre (3,462 cc) 6-cylinder Austin D-Series petrol engine producing around 60 hp. It was built with open-cab ("YB" style), closed-cab, and canvas-covered cargo configurations. Many early ones were lost during the 1940 evacuation of Dunkirk, making surviving original military K30 trucks extremely rare today. However the production went on and it was eventually deployed across theaters including Western Europe, North Africa, and the Soviet Union.
Development
The Austin K30 was originally designed in 1938 as a light commercial vehicle for civilian markets. When the British War Office urgently ordered the mass-militarisation of transport vehicles ahead of World War II, Austin modified this civilian 30-cwt (1.5-ton) baseline to withstand the rigours of the battlefield. The primary differences between the civilian K30 chassis and its militarised counterparts involve structural reinforcement and simplified cab design:
Structural & Mechanical Variations
Chassis Length & Crossmembers:
The core civilian K30 had a shorter, lighter frame compared to its 2-ton and 3-ton military counterparts (like the K2 and K3). However, militarised K30 units received extra chassis bracing and stiffer leaf-spring packs to handle cross-country driving under full military loads.
Wheels and Tyres:
Civilian trucks typically ran smaller, narrower road tyres with dual rear wheels for standard cargo transport. The military adaptations swapped these for single, wide 10.50 x 16 run-flat or cross-country tyres to ensure better traction in mud and sand.
Dual Fuel Tanks:
The civilian chassis operated on a single fuel tank setup. The militarised chassis accommodated twin side-mounted fuel tanks (one on each side) to vastly increase operational range in combat zones.
Cab & Body Adaptations
"YB/YC" Open Cabs:
Initial military batches built in 1939–1940 completely abandoned the civilian curved metal cabs in favour of an open-topped cab with a simple canvas awning (designated index code YC). This saved steel and allowed for better aircraft detection. Most of these open-topped models were abandoned or destroyed during the 1940 evacuation of Dunkirk.
"GS" Closed Cabs:
By 1941, production demands forced a compromise. Austin re-introduced a closed steel cab based directly on the standard pre-war civilian lorry tooling (index code GS), but deleted commercial luxury trims, using simple split flat windscreens and minimal instrumentation.
Ambulance (K2 Chassis):
The civilian K30 chassis layout was so effective that the War Office chose it as the direct foundation for the Austin K2/Y Heavy Ambulance ("Katy"). For the ambulance, the K30 chassis layout was slightly adapted (becoming the K2 chassis designation) to take a wider, custom wood-and-canvas body manufactured by coachbuilders, with 13.100 manufactured.
Austin K3:
The Austin K3 was the workhorse derived from the K30 as a 3-ton 4x2 medium tactical truck introduced just before the outbreak of war in 1939, and also used in lare numbers in the British Expeditionary Force (BEF) for campaign in France and Belgium (1939–1940), and produced until 1945. Most featured Open Cabs (open War Department (WD) pattern cab) with a lightweight canvas awning/tilt (code YC). Later iterations from 1941 onward pivoted to the familiar enclosed civilian-style cab shared with the Austin K2.
Unlike the K2 they had dual rear wheels to support heavier weight distribution and distinctive high-mounted headlights level with the top of the bonnet. In that, the K3 and K30 were strongly related. They had also the Austin 3.5L (3,462 cc) 6-cyl. overhead-valve (OHV) petrol engine. Roughly 17,000 were manufactured during the war, more than the K2 and far more than the K30.
The dual rear wheels were another difference with the single ones of the K30, as well as the lighter rate of 1.5 ton payload, Light duty leaf-spring pack, Lighter, standard commercial grade frame. The K30 was thus mostly used on the rear lines, instead of the K3 which was also used as a frontline tactical truck.
Design
Chassis and general design
The dimensions and technical specifications for the 1941 Austin K30 (30-cwt 4x2 General Service military variant) were the following:
-Overall Length: 216 inches (approx. 5.49 metres)
-Overall Width: 86 inches (approx. 2.18 metres)
-Wheelbase: 134 inches (approx. 3.40 metres)
-Total Gross Weight: 3,124 kg (approx. 3.07 tons)
They had a classic enclose, metal civilian cab unlike other adapted models that went for tarpaulin cabs, had three arches for the tarpaulin roof, they had road lights, direction lights, rear mirrors, a split windshield, but they diverged with the GS being given a metal cab and a canvas roof built under the index YC.
Engine & Performance
-Engine Type: Austin D-Series inline 6-cylinder petrol
-Displacement: 3,462 cc (3.5 litres)
-Power Output: 60 bhp @ 3,000 rpm
-Torque: 153 lb-ft @ 1,200 rpm
-Top Road Speed: Approx. 50 mph (80 km/h)
Drivetrain & Chassis
-Transmission: 4-speed manual "crash" (non-synchromesh) gearbox
-Transfer Box: 2-speed
-Drive Configuration: 4x2
-Suspension: Heavy-duty leaf springs (front and rear)
-Brakes: Hydraulically operated drums
-Tyre Size: 10.50 x 16
-Fuel Tanks: Two side-mounted petrol tanks, totalling roughly 24 Imperial gallons (approx. 109 litres).
specifications |
| Lenght | 5.49 m (216 inches) |
| Width | 2.18 m (86 inches) |
| Wheelbase | 3.4 m (134 inches) |
| Weight | 3,124 kgs gross |
| Crew | 1 driver, co-driver, up to 10 troops |
| Propulsion | Austin D-Series inline 6-cyl. petrol 60 bhp |
| Suspension | 2x4 Leaf Springs |
| Speed (road) | 50 mph (80 km/h) |
| Range | Unknown, 109 liters gasoline |
| Armament | None |
| Production | 4500 |
The Austin K30 in action
The first batch was mobilized for the BEF in France (Brtish Expeditionary Force). In the medium category, WD Austins & Austin 30-cwt types were requisitioned and the remainder were specially produced military-issue lorries. They were classed as medium 30 cwt models, so from 1.5 to 3 tons payload. They served in the same category as the Bedford OY, Leyland Retriever, AEC R6T and AEC 850 (FWD R6T) Heavy recovery and artillery tractor truck plus roughly 26,000 civilian commercial vans and trucks requisitioned by September 1939.
However it is not known how much Austin 30 Cwt were available by May 1940. What is certain however, is that the BEF had to abandon them as well as other types in the pocket of Dunkirk and elsewhere, men had priority. The Germans likely captured more of them, when not sabotaged, they could be reused to some extent by the Wehrmacht as Beuteenfahrzeuge, alongside K2 and K3 models. Some also ended based on photo evidence on the Eastern Front. However between their limited numbers and gradual lack of spares, plus the brutal conditions in Russia it is likely very few were serviceable past 1943.
Production of the K30 continued and this truck ws also deployed in North Africa, taking part in the campaign until Tunisia in 1943. However with its light payload, the K30 started to be retired from active units in 1941 when it was recoignized by the RASC that these 1.5 ton lorries were a wast of resources and vehicles with a 3t payload like the K3 were far more desirable. The K30 was also sent in lend-leased to USSR. Around 500 were shipped there, and they all had a closed civilian-type steel cab and single rear wheels. It seems there are three of these K30 surviving today.