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Westland Dragonfly (WS-51)


Light Utility Helicopter


United Kingdom | 1950



"Fewer than 135 of the Westland WS-51 Dragonfly series helicopter were produced for the British military and others during the early-1950s."



Authored By: Staff Writer | Last Edited: 08/24/2018 | Content ©www.MilitaryFactory.com | The following text is exclusive to this site; No A.I. was used in the generation of this content.
For a period in its history, Westland Aircraft of the United Kingdom produced, under license, the Sikorsky "S-51" helicopter product as the WS-51 "Dragonfly". This light utility-minded platform was operated in the Search & Rescue (SAR) and communications roles for its time in service and 133 of the type were produced by Westland from the period spanning 1949 to 1954. A first-flight of a prototype was had on October 5th, 1948 and service introduction occurred in 1950.

Rather than develop a helicopter system from scratch, Westland managed to secure a production agreement with Sikorsky for the S-51 in December of 1946. The aircraft retained all of the form and function of the original including its rather utilitarian appearance, three-bladed main rotor and three-bladed tail rotor. The wheeled tricycle undercarriage was fixed in place and the forward section of the fuselage contained a series of window panels for excellent vision out-of-the-cockpit. The helicopter was essentially a no-frills product that could be handed different over-battlefield roles.

Beyond the WS-51 prototype - the sole example completed - were several major variants: The HR.Mk 1 was the standard SAR platform of which thirteen were built for the British Royal Navy (RN) and these were powered by 1 x Alvis 50 radial piston engine 540 horsepower. The HC.Mk1 served the British Royal Air Force (RAF) in the casualty evacuation role - only two were procured. The HR.Mk 3 was used by the RN in the air-search and SAR roles and finished with all-metal rotor blades. Some seventy-one were built. The HC.Mk 4 was another casualty evacuation helicopter developed to serve the RAF and these were given the same all-metal rotor blades with production reaching twelve units in all. The HR.Mk 5 was another air-search / SAR platform and used by the RN. These were built up from existing HR.Mk 1 and HR.Mk 3 models.

Two civilian transport forms also emerged in time, these being the WS-51 Mk 1A and WS-51 Mk 1B. The former carried an Alvis "Leonides" 521/1 series radial engine of 520 horsepower and the latter was finished with a Pratt & Whitney R-985 "Wasp Junior" B4 radial engine of 450 horsepower. Production totaled 36 and 15, respectively.

Once in circulation, the series gave good service and was eventually taken on by the militaries of Egypt, Hong Kong, Italy, Thailand and Yugoslavia as well. Commercial/civilian market operations were seen with helicopter through Belgium and the United Kingdom.

The Dragonfly was directly succeeded in British Royal Navy service by the Westland "Whirlwind" helicopter - another locally-produced licensed product from Sikorksy (the S-55/H-19 "Chickasaw").

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Power & Performance
Those special qualities that separate one aircraft design from another. Performance specifications presented assume optimal operating conditions for the Westland Dragonfly Light Utility Helicopter.
1 x Alvis Leonides 50 series radial piston engine developing 540 horsepower and driving a three-bladed main rotor and three-bladed tail rotor.
Propulsion
96 mph
155 kph | 84 kts
Max Speed
12,402 ft
3,780 m | 2 miles
Service Ceiling
301 miles
485 km | 262 nm
Operational Range
City-to-City Ranges
Operational range when compared to distances between major cities (in KM).
NYC
 
  LON
LON
 
  PAR
PAR
 
  BER
BER
 
  MOS
MOS
 
  TOK
TOK
 
  SYD
SYD
 
  LAX
LAX
 
  NYC
Structure
The nose-to-tail, wingtip-to-wingtip physical qualities of the Westland Dragonfly Light Utility Helicopter.
1
(MANNED)
Crew
57.6 ft
17.55 m
O/A Length
48.1 ft
(14.65 m)
O/A Width
13.0 ft
(3.95 m)
O/A Height
4,409 lb
(2,000 kg)
Empty Weight
5,875 lb
(2,665 kg)
MTOW
Design Balance
The three qualities reflected below are altitude, speed, and range. The more full the box, the more balanced the design.
RANGE
ALT
SPEED
Variants
Notable series variants as part of the Westland Dragonfly (WS-51) family line.
WS-51 "Dragonfly" - Base Series Designation
Dragonfly HR.Mk 1 - SAR variant; Alvis 50 radial engine of 540 horsepower; 13 examples built.
Dragonfly HC.Mk 2 - MEDEVAC variant for RAF; 2 examples completed.
Dragonfly HR.Mk 3 - SAR variant for RN; all-metal blades; 71 examples completed.
Dragonfly HC.Mk 4 - MEDEVAC variant for RAF; all-metal blades; 12 examples completed.
Dragonfly HR.Mk 5 - SAR variant for RN; built from HR.Mk 1 and HR.Mk 3 stock.
WS-51 Mk 1A - Civilian market form with Alvis Leonides 521/1 radial engine of 520 horsepower; 36 completed.
WS-51 Mk 1B - Civilian market form with Pratt & Whitney R-985 Wasp Junior B4 radial engine of 450 horsepower.; 15 examples completed.
Operators
Global customers who have evaluated and/or operated the Westland Dragonfly (WS-51). Nations are displayed by flag, each linked to their respective national aircraft listing.

Total Production: 133 Units

Contractor(s): Westland Aircraft - UK
National flag of Belgium National flag of Czechia National flag of Egypt National flag of Italy National flag of the Netherlands National flag of Thailand National flag of the United Kingdom National flag of Yugoslavia

[ Belgium; Czech Republic; Egypt; Hong Kong; Italy; Netherlands; Thailand; United Kingdom; Yugoslavia ]
Relative Max Speed
Hi: 100mph
Lo: 50mph
Aircraft Max Listed Speed (96mph).

Graph Average of 75 MPH.
Era Crossover
Pie graph section
Showcasing Aircraft Era Crossover (if any)
Max Alt Visualization
Small airplane graphic
Production Comparison
133
36183
44000
Entry compared against Ilyushin IL-2 (military) and Cessna 172 (civilian) total production.
MACH Regime (Sonic)
Sub
Trans
Super
Hyper
HiHyper
ReEntry
RANGES (MPH) Subsonic: <614mph | Transonic: 614-921 | Supersonic: 921-3836 | Hypersonic: 3836-7673 | Hi-Hypersonic: 7673-19180 | Reentry: >19030
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1 / 1
Image of the Westland Dragonfly (WS-51)
Image copyright www.MilitaryFactory.com; No Reproduction Permitted.

Mission Roles
Some designs are single-minded in their approach while others offer a more versatile solution to airborne requirements.
MEDEVAC
SEARCH & RESCUE
TRANSPORT
COMMERCIAL AVIATION
VIP SERVICE
RECONNAISSANCE
Recognition
Some designs stand the test of time while others are doomed to never advance beyond the drawing board; let history be their judge.
Going Further...
The Westland Dragonfly (WS-51) Light Utility Helicopter appears in the following collections:
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