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Sikorsky H-34 / CH-34 Choctaw


Transport / Close-Support Helicopter


United States | 1954



"The Sikorsky H-34 Choctaw served with the USAF, US Army, USMC, USN and the USCG during its tenure in American hands."



Authored By: Staff Writer | Last Edited: 05/16/2021 | Content ©www.MilitaryFactory.com | The following text is exclusive to this site; No A.I. was used in the generation of this content.
The H-34 Choctaw was a multi-purpose, radial-powered utility helicopter produced by Sikorsky in the United States. It was developed as a replacement for the similar Korean War-era UH-19 Chickasaw series of helicopters and designed from the outset as an Anti-Submarine Platform for use by the United States Navy. Its operational capabilities eventually led to its use by the United States Army, United States Air Force, the United States Marine Corps and the United States Coast Guard. The Choctaw also went on to prove a commercial success, being fielded in the ranks by no fewer than 27 foreign partners including some limited license production of the type. The Choctaw saw notable service in the Vietnam War. First flight of the system was achieved on March 8th, 1954.

Visibly, the Choctaw wasn't going to win any design awards based on looks alone. It was a far cry from being the best looking of Cold War creations but it was an vast upgrade from the utilitarian approach of the H-19 Chickasaw before it. Design of the H-34 was stout, featuring a large set rounded nose with a raised flightdeck. The pilot and co-pilot sat in their raised positions ahead of the powerplants and above and forward of the passenger/cargo cabin. Entry into the system was provided for by a large rectangular access door (sliding aft) located on the starboard side of the lower fuselage. The underside of the fuselage maintained a predominantly straight appearance, giving the Choctaw its unique profile. The undercarriage was fixed and consisted of two main landing gears supported by exposed struts and a single tail wheel. The main landing gear systems were positioned just forward of the passenger cabin and fitted with a large single wheel each. Power was generally supplied by a Wright R-1820-84 Cyclone radial engine delivering up to 1,525 horsepower and driving a four-bladed main rotor and a four-bladed tail rotor. While the operational crew amounted to two personnel, the cabin had space for up to 16 combat-ready troops, 18 passengers or 8 medical litters. A top speed of 173 miles-per-hour was listed as was a range of 182 miles.

The Choctaw lived a long service live under many guises beginning as the HSS-1 "Seabat" for the United States Navy (in its Anti-Submarine Warfare role). This was coupled with the similar HUS-1 "Seabat" utility transport. The "Seabat" series consisted of US Navy Choctaws built to anti-submarine warfare specifications initially appearing as three Sikorsky S-58 models for evaluation as XHSS-1 prototype systems. The XHSS-1 then became the YHSS-1 before ultimately being re-designated to YSH-34G. The first production models became the HSS-1 "Seabat". The HSS-1N "Seabat" was of note as it was a dedicated bad weather/night version fitting improved autopilot and avionics systems. Seabats fell under the designation of SH-34 beginning in 1962.

The "Seahorse" series was operated primarily by the US Marine Corps and the US Coast Guard. These were noted by their designation of "HUS" as in the HUS-1, HUS-1A, HUS-1G, HUS-1L and the HUS-1Z. These eventually became the UH-34 "Seahorse" series beginning in 1962. The United States Coast Guard operated the Choctaw from 1959 through 1962.

The US Army fielded the H-34A model (later becoming the CH-34). It was the US Army, in fact, that gave the helicopter the name of "Choctaw" beginning in 1962 to which the USAF also applied to their delivered units. These were fitted with R-1820-84 radial engines of 1,525 horsepower. A staff transport version was also developed and noted for the use of "V" in its designation (VH-34A). The slightly different H-34B and H-34C soon followed as did several developmental weapon test beds. The US Army operated the Choctaw well into the early 1970's, by which time Sikorsky had completed all production of the type.

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It should be noted that the US military restructuring of 1962 forced a change to all designations of operational aircraft at the time, hence the mentions above. As such, the H-34A were now referred to as the CH-34A. Likewise, the H-34B was now the CH-34B and so on. See the variants listing for a full report of the designation changes.

Commercial Choctaws were available in a variety of configurations. These were noted by their Sikorsky "S-" designations becoming the S-58 base cargo model, the S-58B improved cargo model, the S-58C passenger airliner/transport model, the S-58D freighter/airliner model, the S-58T conversion models fitted with turboshafts instead of radials, the S-58 "Heli-Camper" fitting Wright Cyclone R-1820-24 series engines and the "Orlando Airliner" 18-seat passenger transport.

The Choctaw was produced overseas via license-production in France and in Britain. The French received one batch of 134 Choctaws in parts from the United States and assembled them under the Sud-Aviation banner. A further 166 were manufactured on French soil as new-build Choctaws for the French Army, Navy and Air force, these again produced by Sud-Aviation. The British took to building their Choctaws under the Westland brand label and afforded the system the designation of "Wessex" with the Royal Navy becoming a notable operator of these machines (turbine-powered), utilizing them in the Anti-Submarine Warfare (ASW) role. Other British-produced Wessex's were marketed to foreign military and civilian operators.

Operators of the Choctaw covered the globe with use by Argentina, Australia, Belgium, Brazil, Canada, France, Germany, Greece, Indonesia, Japan, Israel, Italy, Philippines, South Vietnam, Spain, Turkey and Thailand to name a few.

Perhaps its most notable use was in the hands of US forces in the Vietnam War. Though initially delayed into action, some twenty US Army CH-34's made their way into the theater and was utilized wherever necessary. This included MEDEVAC roles, cargo transport for supply and resupply and as an offensive weapons platform. In the latter role, the CH-34 became one of the earliest attempts by American warplanners to arm a helicopter to be used as a gunship. These Choctaws (known as "Stingers") sported two M60C series general purpose machine guns and 2 x 2.75" 19-shot rocket pods comprising the TK-1 (Temporary Kit-1) later used on the successful Bell UH-1 "Huey" line of gunships. The Choctaw operated in the theater for a surprisingly lengthy period of time, proving a reliable workhorse in the process. Even the arrival of the fabled Huey systems did not force the Choctaw completely from the action as Choctaws were still in service with the USMC even after the introduction of the UH-1 series. All remaining CH-34's were eventually handed over to the South Vietnamese government as American involvement in the conflict drew to a close.

Some 1,800 Choctaws were eventually produced.

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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 Sikorsky H-34A / CH-34A Choctaw Transport / Close-Support Helicopter.
1 x Wright R-1820-84 radial engine developing 1,525 horsepower and driving a four-bladed main rotor and a four-bladed tail rotor.
Propulsion
173 mph
278 kph | 150 kts
Max Speed
9,498 ft
2,895 m | 2 miles
Service Ceiling
182 miles
293 km | 158 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 Sikorsky H-34A / CH-34A Choctaw Transport / Close-Support Helicopter.
2
(MANNED)
Crew
56.7 ft
17.28 m
O/A Length
56.0 ft
(17.07 m)
O/A Width
15.9 ft
(4.85 m)
O/A Height
7,899 lb
(3,583 kg)
Empty Weight
13,999 lb
(6,350 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
Armament
Available supported armament and special-mission equipment featured in the design of the Sikorsky H-34 / CH-34 Choctaw Transport / Close-Support Helicopter provided across 2 hardpoints.
OPTIONAL, VARIOUS: Dependent upon on mission parameters. As a gunship, the Choctaw was fitted with:

2 to 4 x 7.62mm M60C General Purpose Machine Guns (GPMGs) on outboard structure assembly.
2 x 18-tube 2.75" rocket launchers on outboard structure assembly.


X
X
Hardpoints Key:


Centerline
Wingroot(L)
Wingroot(R)
Wing
Wingtip
Internal
Not Used
Variants
Notable series variants as part of the Sikorsky H-34 / CH-34 Choctaw family line.
H-34A - US Army Variant; fitted with R-1820-84 engine of 1,525 horsepower; 359 examples produced; 21 Army models sent to US Navy; re-designated to CH-34A beginning in 1962.
JH-34A - Developmental H-34A model used in weapons testing.
VH-34A - Staff Transport Model based on the H-34A/CH-34A.
H-34B - Based on H-34A/CH-34A production models with subtle changes; re-designated to CH-34B beginning in 1962.
H-34C - Based on H-34B/CH-34B production models with subtle changes; redesignated to CH-34C beginning in 1962.
JH-34C - Developmental Model based on H-34C/CH-34C used in weapons testing.
VH-34C - Staff Transport Model based on the H-34C/CH-34C.
HH-34D - Choctaws given USAF serial numbers for transfer under the Mutual Defense Assistance Act.
LH-34D - Re-designated from HUS-1L beginning in 1962.
UH-34D - Re-designated from HUS-1 beginning in 1962; at least 54 production examples appeared as "new-build" models.
VH-34D - Re-designated from HUS-1Z beginning in 1962; staff transport model.
UH-34E - Re-designated from HUS-1A beginning in 1962.
HH-34F - Re-designated from HUS-1G beginning in 1962.
YSH-34G - Re-designated from YHSS-1/XHSS-1 beginning in 1962.
SH-34G - Re-designated from HSS-1 beginning in 1962.
SH-34H - Re-designated from HSS-1F beginning in 1962.
YSH-34J - Re-designated from YHSS-1N beginning in 1962.
SH-34J - Re-designated from HSS-1N beginning in 1962.
UH-34J - Based on the SH-34J; sans Anti-Submarine Warfare (ASW) equipment; utility transport and trainer model.
HH-34J - Former USN models now utilized by the USAF.
VH-34J - Based on the SH-34J; staff transport model.
XHSS-1 "Seabat" - US Navy evaluation Choctaws; three examples delivered as such; later re-designated to YHSS-1 then becoming the YSH-34G beginning in 1962.
HSS-1 "Seabat" - Anti-Submarine Warfare platform for use by the USN; 215 examples produced; re-designated to SH-34G beginning in 1962.
HSS-1F "Seabat" - Developmental Model based on HSS-1; fitted with 2 x General Electric YT-58-GE engines; re-designated to SH-34H beginning in 1962.
YHSS-1N "Seabat" - Single Prototype Model; HSS-1 converted to HSS-1N; re-designated to SH-34H beginning in 1962.
HSS-1N "Seabat" - Bad Weather/Night Model based on HSS-1; fitted with revised autopilot system and avionics suite; 167 examples produced; re-designated to SH-34J beginning in 1962.
HUS-1 "Seahorse" - USMC Transport Model based on the HSS-1; 462 examples produced; re-designated to UH-34D beginning in 1962.
HUS-1A "Seahorse" - Amphibious Conversion Model fitted with pontoons; 40 examples produced; becoming the UH-34E beginning in 1962.
HUS-1G "Seahorse" - USCG model based on the HUS-1; six total examples produced; re-designated to HH-34F beginning in 1962.
HUS-1L "Seahorse" - Antarctic Conversion Models; four examples converted in this fashion; re-designated to LH-34D beginning in 1962.
HUS-1Z "Seahorse" - VIP Passenger Transport; 7 HUS01 models converted as such; re-designated to VH034D beginning in 1962.
S-58 - Commercial Cargo Transport Model
S-58B -Commercial Cargo Transport Model
S-58C - Commercial Utility Model
S-58D - Commercial Utility Model
S-58T - Commercial Passenger Transport with turboshaft engines.
S-58 "Heli-Camper" - Commercial Passenger Transport; fitted with Wright Cyclone R-1820-24 engines.
Orlando Airliner - Commercial Transport Transport with seating for 18.
Westland Wessex - British license-production Choctaws as used by the Royal Navy in the ASW.
Operators
Global customers who have evaluated and/or operated the Sikorsky H-34 / CH-34 Choctaw. Nations are displayed by flag, each linked to their respective national aircraft listing.

Total Production: 1,800 Units

Contractor(s): Sikorsky Aircraft - USA / Westland - UK / Sud-Aviation - France
National flag of Argentina National flag of Australia National flag of Belgium National flag of Brazil National flag of Canada National flag of Chile National flag of France National flag of modern Germany National flag of Greece National flag of Indonesia National flag of Iran National flag of Israel National flag of Italy National flag of modern Japan National flag of Nicaragua National flag of Peru National flag of the Philippines National flag of Spain National flag of Taiwan National flag of Thailand National flag of Turkey National flag of the United States National flag of Uruguay National flag of Vietnam

[ Argentina; Australia; Belgium; Brazil; Cambodia; Canada; Chile; Taiwan; Costa Rica; France; Germany; Greece; Haiti; Indonesia; Italy; Iran; Israel; Japan; Katanga; Laos; Nicaragua; Philippines; Peru; South Vietnam; Spain; Turkey; Thailand; United States; Uruguay ]
Relative Max Speed
Hi: 200mph
Lo: 100mph
Aircraft Max Listed Speed (173mph).

Graph Average of 150 MPH.
Era Crossover
Pie graph section
Showcasing Aircraft Era Crossover (if any)
Max Alt Visualization
Small airplane graphic
Production Comparison
1800
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
Aviation Timeline
EarlyYrs
WWI
Interwar
WWII
ColdWar
Postwar
Modern
Future
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Mission Roles
Some designs are single-minded in their approach while others offer a more versatile solution to airborne requirements.
GROUND ATTACK
CLOSE-AIR SUPPORT
ANTI-SUBMARINE WARFARE
TRANSPORT
COMMERCIAL AVIATION
VIP SERVICE
TRAINING
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 Sikorsky H-34 / CH-34 Choctaw Transport / Close-Support Helicopter appears in the following collections:
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