Back to Bike FinderYears: 1957 · 1956 · 1955
Douglas Dragonfly
1957Sportbike

Douglas Dragonfly

Key specifications

Engine
348 cc
Power
17 HP
Weight
166 kg
Fuel type
petrol
Fuel capacity
6.6 L
Front brakes
Expanding brake (drum brake)
Rear brakes
Expanding brake (drum brake)

Overview

Introducing the 1957 Douglas Dragonfly, a remarkable motorcycle that captures the essence of British engineering and the spirit of the sportbike era. Emerging from a storied lineage of motorcycle innovation, the Dragonfly was designed to appeal to riders seeking both performance and style. With its distinctive design and robust capabilities, this lightweight sport motorcycle carved a niche in a competitive market, standing out for its unique blend of classic aesthetics and practical performance. At the heart of the Dragonfly is a 348cc twin-cylinder, four-stroke engine that produces 17 horsepower at 5500 RPM, delivering an exhilarating ride for enthusiasts. This power plant, coupled with a chain final drive, ensures a responsive throttle and fluid acceleration. The Dragonfly's lightweight frame, weighing in at just 166 kg (366 pounds), offers an impressive power-to-weight ratio of 0.1024 HP/kg, making it quick and nimble on the road. Riders will appreciate the engaging experience provided by the carburettor fuel system, which allows for smooth power delivery, complemented by a coil ignition system that ensures reliable starts and consistent performance. The Dragonfly's design is not only visually striking but also functionally sound. The tubular duplex cradle frame provides excellent rigidity and stability, while the leading link front suspension enhances handling and cornering capabilities. The motorcycle is equipped with reliable drum brakes, both front and rear, allowing for confident stopping power. The rear suspension features hydraulic shock absorbers, which help smooth out the bumps in the road, making for a comfortable ride over various terrains. With a fuel capacity of 25 liters (6.61 gallons), the Dragonfly is designed for longer journeys, ensuring that riders can enjoy extended time in the saddle without frequent stops. **

Pros

  • Lightweight and Agile: At 166 kg, the Dragonfly offers impressive maneuverability, making it a joy to ride in both urban settings and twisty backroads.
  • Classic Styling: The design reflects the charm of the 1950s, appealing to vintage motorcycle enthusiasts and collectors alike.
  • Smooth Power Delivery: The engine's carburettor system provides responsive throttle response, enhancing the overall riding experience.

Cons

  • Limited Power Output: With only 17 HP, the Dragonfly may feel underpowered for riders seeking high-performance thrills.
  • Drum Brakes: While reliable, the drum brake system may not offer the stopping power and responsiveness of modern disc brakes.
  • Older Technology: As a vintage model, the Dragonfly lacks some modern conveniences and advancements in motorcycle technology, which may deter some contemporary riders.

Technical details

Source specification data

Make
Douglas
Model
Dragonfly
Category
Sport
Power
17.00 HP (12.4 kW)) @ 5500 RPM
Ignition
Coil
Fuel System
Carburettor
Displacement
348.00 ccm (21.23 cubic inches)
Engine Details
Twin, four-stroke
Transmission Type Final Drive
Chain
Dry Weight
166.0 kg (366.0 pounds)
Fuel Capacity
25.00 litres (6.61 gallons)
Power Weight Ratio
0.1024 HP/kg
Seat
Dual
Wheels
Spoked
Frame Type
Tubular duplex cradle
Rear Brakes
Expanding brake (drum brake)
Front Brakes
Expanding brake (drum brake)
Rear Suspension
Hydraulic Shock Absorber
Front Suspension
Leading link