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The Sikorsky Model S-61 Helicopter - Model Designations

Westland Sea King HAS.6 - XV712 - once assigned to the Fleet Air Arm, now preserved at Duxford. Photo: A.A.S. Westland Sea King HAS.6 - XV712 - once assigned to the Fleet Air Arm, now preserved at Duxford. Photo: A.A.S.
27 JAN 2006 - A Sikorsky UH-3H Sea King - BuNo 152123 - assigned to HC-2. Photo: U.S. Navy by Photographer's Mate Airman Tristan Miller 27 JAN 2006 - A Sikorsky UH-3H Sea King - BuNo 152123 - assigned to HC-2. Photo: U.S. Navy by Photographer's Mate Airman Tristan Miller
A Canadian Forces Sikorsky CH-124 Sea King Helicopter lifts off aboard the USS Ford (FFG-54) during Exercise Trident Fury 2013. Photo: U.S. Navy A Canadian Forces Sikorsky CH-124 Sea King Helicopter lifts off aboard the USS Ford (FFG-54) during Exercise Trident Fury 2013. Photo: U.S. Navy
KLM Helikopter's Sikorsky S-61N Mk II - PH-NZI, s/n 61-762.  Photo: InterAir KLM Helikopter's Sikorsky S-61N Mk II - PH-NZI, s/n 61-762. Photo: InterAir
Model Designations

Note: It should be mentioned that many airframes had more than one designation, although not concurrently, as a rule. This could be as a result of a simple designation change, or a conversion or an upgrade to the airframe's specifications. For example, in September 1962, the HSS-2 became the SH-3A, with no changes to the airframe. The installation of more powerful engines saw the CH-3C re-designated as CH-3E. Additionally, some models could be referred to by both a Sikorsky company designation and a military designation.
In general all models of the S-61, regardless of service or country, were referred to as Sea Kings. Notable exceptions were the U.S. Air Force HH-3E - known as the Jolly Green Giant, and the U.S. Coast Guard HH-3F - known as the Pelican. Of course, there is also the Malaysian S-61A-4 Nuri, the Westland-built Commando, and the civilian S-61N/L-based Payloader
Also, it should be noted that the following list is not in any particular chronological order.

As always, this is a work in progress, so we welcome your comments, additions and corrections - Thanks and Fly Safe.

The Sikorsky Model Designations (note: most of these are civilian models, but a few are military birds):

S-61A

S-61A-4:

S-61B

S-61D:

S-61D-2: A single Sikorsky-built airframe delivered to Westland, as a model demonstrator and production example. Powered by GE turboshafts. This airframe carried both the civil registration of G-ATYU, and the British military serial number XV370.

S-61D-4: Essentially an SH-3D, but delivered to the Argentine Navy.

S-61F

S-61L

S-61N

S-61N Mk II

S-61R

Payloader


United States Navy and United States Marine Corps Models

YHSS-2

HSS-2

HSS-2Z

HR3S-1: This was to be an HSS-2 variant optimized for combat assault. The designation HR3S-1 was assigned to the program, but no airframes were built. The project was ultimately awarded to the Boeing-Vertol HRB-1, later known as the CH-46A Sea Knight.

SH-3A

YSH-3D: A single airframe - BuNo 152139 - used as the production prototype for the SH-3D, and powered by two 1,400 shp GE T58-GE-10. Increased full capacity and an improved mission avionics suite.

SH-3D

SH-3G

SH-3H

YSH-3J

HH-3A

NH-3A

RH-3A

VH-3A


United States Air Force Models

CH-3A-SI

CH-3B-SI

CH-3C-SI

JCH-3C-SI

CH-3E-SI

HH-3E-SI


United States Coast Guard

HH-3F


Canadian Military

CHSS-2

CH-124


The Westland Airframes
But, first a view abbreviations: HAS - Helicopter AntiSubmarine, HAR - Helicopter Search and Rescue, HC - Helicopter Cargo, AEW - Airborne Early Warning.

Sea King HAS Mk1

Sea King HAS Mk 2

Sea King HAS Mk 5

Sea King AEW

Sea King HAR Mk 3

Sea King HC Mk 4

Commando Mk 1

Commando Mk 2


Westland Export Airframes (Note that while many of these airframes are based on standard British models, many were equipped with options specified by the individual customer.

Sea King Mk 41: Twenty-two aircraft delivered to the West German Navy, essentially a Sea King HAS Mk 1 airframe optimized for search and rescue. Did not include ASW equipment. Many were later upgraded with additional combat operability and survivability equipment.

Sea King Mk 42: Essentially a Sea King HAS Mk 1, but delivered to the Indian Navy. Primary mission was ASW.

Sea King Mk 42A: A new-build, upgraded Sea King Mk 42. New equipment consisted primarily of a haul-down system for small deck landings.

Sea King Mk 42B: Based on the upgraded Sea King HAS Mk 5, also for the Indian Navy.

Sea King Mk 43: Search and rescue version of the Sea King HAS Mk 1 built for Norwegian Air Force.

Sea King Mk 43a: An upgraded version of the Sea King Mk 43.

Sea King Mk 45: Essentially a Sea King HAS Mk 1, but delivered to Pakistani Navy. Primary mission was ASW.

Sea King Mk 47: Essentially an upgraded Sea King HAS Mk 1, but delivered to Pakistani Navy. Primary mission was ASW. These airframes were order by Saudi Arabian for, and delivered to, the Egyptian Navy.

Sea King Mk 48: Delivered to the Belgian Air Force, these airframes were basically upgraded Sea King HAS Mk 1 airframes, optimized for search and rescue, and without the ASW electronics suite. On was configured for VIP passenger transport.

Sea King Mk 50: Another aircraft based on an upgraded Sea King HAS Mk 1, these delivered to the Royal Australian Navy. Optimized for a variety of missions, including ASW, search and rescue, logistics, and troop lift. A long range, self ferry capability was standard.

Commando Mk 2: Seventeen airframes, under the standard Commando Mk 2 designation, delivered to the Egyptian Air Force. This order as paid for by Saudi Arabia.

Commando Mk 2B: Two VIP configured airframes delivered to the Egyptian Air Force. This order was paid for by Saudi Arabia.

Commando Mk 2A: Three standard Commando Mk 2 airframes delivered to the Qatar Emiri Air Force.

Commando Mk 2C: One VIP configured Commando Mk 2 airframe delivered to the Qatar Emiri Air Force.
 

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