Westland Whirlwind H.A.R. Mk. 9: A Second Attempt

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Introduction and History
The Westland Whirlwind is a medium utility helicopter developed from the Sikorsky S-55 (Civilian version of the H-19). In 1950, Westland wanted to get their hands on a helicopter that could supplant their Dragonfly (a license-built version of the Sikorsky S-51). In 1951, Westland received their first S-55 from Sikorsky as a demonstrator for the type. While working on the aircraft for domestic production, it was noted that some of the British components were heavier than their American counterparts. Therefore the UK used their American-built S-55s as a template to reverse engineer the lighter components, while redesigning the main rotor gearbox entirely. In 1954, Westland first batch of domestic aircraft had finally been delivered to the Royal Navy. The RAF and Royal Navy would continue to use piston-engined variants up until 1961, when the RAF would receive Whirlwinds with Bristol Siddeley/Rolls-Royce Gnome turboshafts. These aircraft were designated H.A.R. Mk. 10. The Royal Navy wouldn’t receive a similar aircraft until 1966, when they would obtain their H.A.R. Mk. 9 aircraft. Production of the Whirlwind would last until 1966, with the last piston-engined version being retired in 1976, and the last Whirlwind in service to be retired in the 1980s.

The Whirlwind saw extensive use during the Borneo Confrontation by RAF as the H.A.R. Mk. 10, where it served alongside the much larger Westland Wessex. The Whirlwind’s design allowed it to be a great light rescue and supply helicopter. On top of this, the Whirlwind also served as an attack helicopter with provisions for two Nord SS.11 missiles, though during the conflict it was not uncommon to see aircraft with four missiles. Unfortunately, the H.A.R. Mk. 9 entered service too late to have any combat usage.

Specifications
The British don’t like putting information in things

Specifications (H.A.R. Mk. 9)

Crew: 2 (Pilot and Co-Pilot/Gunner)
Length: 44’ 2"
Width (Blades Folded): 11’ 6"
Tread (Main Gear): 11’
Tread (Nose Gear): 4’ 8"
Height: 15’ 7.5"
Rotor Diameter: 53’
Fuel capacity: At least 170 gallons in 2 fuel tank groups

Weights:
Empty: 5483 lbs.
Normal Gross Weight: 7800 lbs.
Overload Gross Weight: 8000 lbs.

Do Not Exceed Speed: 95 knots
Ceiling: 10,000 ft.
Engine: Gnome Mk. 103 (1050 shp, 730 shp after losses)
Engine Compressor RPM: 14,200 (idle) 25,750 to 27,100 maximum
Main Rotor RPM: 205 to 235 (245 Overspeed)
Maximum climb rate: 1200 ft./min @ SL

Armaments
The Sikorsky S-55 was no stranger to armaments. The American H-19 saw use in the Korean War, where door guns were used to cover the aircraft on hot approaches. After the Korean War, one H-19 saw test use with two experimental 15-tube FFAR pods before later being fitted with another experimental armament taken from another helicopter from the same unit. Even the Whirlwind had at least one experimental armament before the use of missiles. A single H.A.R. Mk. 2 with the RAF Joint Experimental Helicopter Unit was fitted with four air-to-ground missiles, albeit of an unknown type, and another with a .50 caliber door gun. According to the pilot’s manual, standard armament to be fitted were two Nord SS.11 missiles, one on either side of the airframe.

Armament Images (3)



Other Images (5)





Conclusion
The Westland Whirlwind was a big step forward for the company. Finally able to produce and export a utility helicopter was a big win for them, and a great asset for the RAF and Royal Navy. In game, the Whirlwind would serve as another missile platform for helicopter players to use.

Sources

Westland Aircraft since 1915 - Derek N. James (1991)
Borneo Boys: RAF Helicopter Pilots In Action - Indonesian Confrontation 1962-66 - Roger Annett (2012)
AP101C-309-15 - H.A.R. Mk. 9 Whirlwind Pilot’s Notes - May 1966
AN 01-230HFB-1 - H-19A Flight Handbook - 19520115
Some Images

5 Likes

Never!

Flying potato with missiles, i like it!

1 Like

Not to be an ass, but you have mixed in two different types of Whirlwind: the HAR.9 and 10.

@da12thmonkey and I have been researching these helicopters for some time and there is information present in the British Helicopter Tech Tree discussion thread in the Machinery of War section.

The HAR.9 modification was not used during the Indonesia-Malaysia Confrontation as it came after it (circa 1964 for the HAR.10 vs 1968 for the HAR.9) and was more or less unrelated to the RAF’s HAR.10. The HAR.9 could only carry two missiles, and used different mounting points than the HAR.10’s, which could carry up to four.

I hope that clears some things up, and I understand that confusion may arise as very little information about these aircraft exists online.

Discussion starts from here:

+1

1 Like

Yeah, among your images this is the only one of the HAR Mk.9

The rest of the photos carrying 4 AS.11s are HAR/HC Mk.10s operated by the RAF

The Mk.9 was converted from Mk.7s, retaining a deeper “belly” on the fuselage with a recess for carrying torpedoes, and only carried 2 AS.11s

Gotta say though. This is a fantastic photo of the Mk.10 you found

Photos of them carrying AS.11s are incredibly hard to find.

I probably should’ve read more closely in the Bonreo Boys book then, since it does clearly state Mk. 10s. Whoops! My Mk. 10 Pilot’s Notes is also missing the armament section unfortunately, which is I went with the Mk. 9 instead.

Also Derek James’s Westland Aircraft Since 1915 states 1961 and 1966 as the introduction years for the Mk. 10 and Mk. 9 respectively.

Spoiler

Yeah that’s alright, information about these are hard to come by, and I would say the best sources for them are listed in the thread I posted.

I would suggest you edit this suggestion to focus more or less about the HAR.9 and then you can write about the HAR.10 separately, as they are more or less different in terms of their background and what they could carry. The thread is quite long, so I would recommend reading it all the way to the end and collecting information as you go.

can we have one as RAF variant search rescue

This looks like a TERRIBLE addition.
I hate the H-34. All of these similar ‘Jolly Green’ variants would have horrible handling and nearly no armament.
Until Gaijin adds door gunners, this would be miserable to use in game.