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The Vincent Rapide Series A was the first V-twin motorcycle built by Vincent HRD. Produced from 1936 to 1939, it introduced a powerful 1000cc engine and became one of the fastest motorcycles of its time.
Overview
- Engine: 998cc V-twin
- Power: 45 bhp
- Top speed: Around 110 mph (177 km/h)
- Production years: 1936–1939
- Notable for: First Vincent V-twin
The Series A Rapide set the foundation for all later Vincent V-twin motorcycles.
Origin of the V-Twin Engine
The engine was designed by Phil Irving, working with company owner Phil Vincent.
Irving realised that by combining two single-cylinder engines into a 47° V-twin layout, Vincent could create a powerful 1000cc bike using many existing parts.
This idea quickly became reality, and the first V-twin Vincent was built in 1936.
Engine & Performance
The Series A used a 998cc air-cooled V-twin engine with:
- Overhead valves (OHV)
- Twin carburettors
- Dry sump lubrication
Performance highlights:
- 45 bhp at 5,500 rpm
- Top speed of 110 mph
For the late 1930s, this made it one of the fastest production motorcycles in the world.
Frame & Suspension
The Series A used a modified version of Vincent’s earlier frame design:
- Steel diamond frame, lengthened for the V-twin
- Early cantilever rear suspension (advanced for its time)
- Girder front forks
A unique feature was the dual-purpose fuel tank, which held both petrol and oil.
Transmission
- 4-speed gearbox (separate unit)
- Chain-driven primary drive
- Wet multi-plate clutch
However, the gearbox struggled with the engine’s power, and riders had to be careful when accelerating hard.
Design & Features
- Twin carburettors for improved performance
- External oil pipes visible around the engine
- Drum brakes front and rear
- Side stand fitted as standard
Because of its exposed pipework, it earned the nickname:
- “The Plumber’s Nightmare”
It was also called:
- “The Snarling Beast”
Launch & Production
The Series A Rapide was first shown at the 1936 motorcycle show in London and quickly gained attention for its speed and engineering.
- Price: £142 at launch
- Production ended: 1939
Why the Series A Matters
The Vincent Rapide Series A is important because it:
- Introduced the Vincent V-twin engine
- Set new performance standards in the 1930s
- Led to later legendary models like the Black Shadow
Today, it is a rare and highly collectible classic motorcycle.
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