Definition
The Austin 10 hp was a series of small family automobiles produced by the Austin Motor Company in the United Kingdom. The designation “10 hp” refers to the vehicle’s tax horsepower rating under the British formula used for vehicle taxation, rather than its actual engine output.
Overview
The Austin 10 hp name was applied to two principal production periods. The first series was introduced in 1909 and manufactured until the outbreak of the First World War, after which production was suspended. A later, more widely recognized model bearing the same tax‑horsepower rating was launched in 1932 and remained in production until 1939. Both versions were positioned as affordable, reliable cars for middle‑class consumers and played a notable role in expanding the market reach of the Austin brand during the early 20th century.
Etymology/Origin
The “Austin” component derives from the company’s founder, Herbert Austin, who established the Austin Motor Company in 1905. The “10 hp” suffix follows the British tax‑horsepower system, which calculated a notional horsepower based on bore and the number of cylinders (the RAC formula). Vehicles were commonly identified by this rating, e.g., “10 hp,” “12 hp,” etc., to indicate their tax class.
Characteristics
| Feature | Early (1909‑1915) Model | Later (1932‑1939) Model |
|---|---|---|
| Engine | Inline‑four, side‑valve, approx. 1.5 L displacement | Inline‑four, side‑valve, 1.2 L–1.4 L displacement (varied by sub‑type) |
| Power Output* | Approximately 15–20 bhp (rated) | Approximately 30 bhp (rated) |
| Transmission | 3‑speed manual gearbox | 4‑speed manual gearbox |
| Body Styles | Open two‑seat tourer, later four‑seat saloon | Four‑door saloon, occasional coupe versions |
| Chassis | Conventional ladder frame with leaf‑spring suspension | Ladder frame, semi‑elliptic leaf springs front and rear |
| Braking System | Mechanical rear‑wheel brakes | Hydraulic drum brakes on all wheels (later models) |
| Production Numbers | Limited; exact figures not confirmed | Approximately 150 000 units built (British sources) |
| Notable Features | Simple, robust construction suited for rural roads | Emphasis on comfort, improved chassis rigidity, and optional “Aerodyn” body shaping |
*Power figures reflect the design era’s nominal ratings; exact brake horsepower varied by engine tuning and specific model year.
Related Topics
- Austin Motor Company – The parent manufacturer, a major British automobile producer from 1905 to 1987.
- British tax horsepower (RAC rating) – The fiscal system that assigned a “hp” rating to vehicles for taxation purposes.
- Austin 12 hp – A larger, contemporaneous model sharing many components with the 10 hp series.
- British automotive history (1910‑1930s) – Contextual background on the growth of motoring in the United Kingdom during the early 20th century.
Note: While the general specifications and production history of the Austin 10 hp are documented in historical automotive references, precise figures for certain early‑model variants (e.g., exact annual production counts) are not uniformly recorded.