Back Sikorsky S-76 "Spirit"
1977

Sikorsky S-76

Having concentrated almost exclusively on military aircraft thus far, Sikorsky announced plans in January 1975 for a twin-turbine helicopter for the civil market. The company had carefully evaulated the needs of potential customers and, after having examined various solutions, had already acquired a number of options. Building of the four prototypes began in May 1976 (the designation S-76 was chosen to mark the American bicentennial). The project clearly showed the experience gained with the S-70 combat helicopter. The second prototype was the first to fly, on 13 March 1977, complete with IFR avionics. From the outset, the aircraft was equipped for all-weather operation, as one of its main roles was intended to be the servicing of offshore oil rigs. The four-blade rotor of this air craft is exactly like that of the S-70. The blades are built around a strong titanium spar; the leading edge is also titanium, while the trailing edge has a fiberglass and nylon honeycomb structure. The entire blade is pressurized for maximum structural integrity. The rotor hub is made according to the latest techniques to minimize maintenance: the normal bearings have in fact been replaced by elastomeric ones needing no lubrication, and special dampers virtually eliminate vibration. The powerplant is installed above the fuselage behind the drive shaft and consists of two 650shp Allison 250-C30 turbines. There is a single 1030 liter fuel tank in the fuselage, but supplementary fuel tanks can be carried for longer journeys.

The carefully streamlined fuselage is also of composite structure. The front part is of fiberglass, the cabin section is of light alloy with honeycomb panels, while the tail, which is also of metal, has a semi-monocoque structure. The retractable tricycle landing gear is hydraulically operated. The cabin is normally furnished, with seats for 14 including the crew of two, but can be modified to suit the operator. There is a large baggage compartment at the rear, with a capacity of 1.19m3. The S-76 can also be fitted with an external cargo hook to carry 2270kg.

Over 200 Sikorsky S-76s were in operation throughout the world in 1983 and principal operators include Air Logistics, Okanagan Helicopters, VOTEC in Brazil, and Bristow in the UK. The version currently in production, the S-76 Mk.ll, which won 12 world records in February 1982, has a special variant of the Allison 250 which yields five per cent more power than the previous model.

G.Apostolo "The Illustrated Encyclopedia of Helicopters", 1984

Sikorsky S-76

Growing demands for transport helicopters in support of offshore energy operations led Sikorsky to initiate worldwide market research to establish the requirements of such operators. An important consideration was seating capacity, and in 1975 Sikorsky began the development of a 14-seat commercial helicopter designated Sikorsky S-76 and later named Spirit. The first of four prototypes (N762SA) was flown on 13 March 1977, and the first fully certificated IFR production aircraft was delivered to Air Logistics of Lafayette, Louisiana, on 27 February 1979.

This two-year certification programme resulted from the use of an advanced dynamic systems/powerplant combination evolved for military requirements, but further development continued from the time that production began, leading to an improved S-76 Mk II from 1 March 1982. This differs by having improved cabin ventilation, dynamic system refinements, more access panels to simplify maintenance, and an advanced version of the Allison 250 turboshaft engine that gives an increase in guaranteed power output. In 1983 Sikorsky flew the first S-76B, to replace the Mk II on the production line. Powered by two 771kW Pratt & Whitney PT6B-36As, the S-76B incorporates aerodynamic refinements developed for the UH-60. S-76B meets FAR Pt 29 category A IFR requirements. As a follow-on to the S-76B the S-76C was announced in June 1989, and flew in May 1990. Powered by Turbomeca Arriel 1S1 engines, the 12-seat S-76C has attracted military orders from Hong Kong and Spain, and is also in use with . several off-shore operators.

Military sales of the S-76 had been few until the introduction of a dedicated, armed version, the H-76 Eagle, in 1985. Featuring armed seats, floor and fuel tanks, the Eagle can be armed with a combination of gun pods, rocket pods and even AAMs on its stub pylons. It can be used in gunship, Medevac, troop-transport, or combat SAR roles and has provision for a chin-or mast-mounted sight. It was selected by South Korea as its new light utility helicopter and an order for up 175 is anticipated. Aircraft are being built in the United States initially, with assembly being gradually transferred to Daewoo-Sikorsky Aerospace. Ltd.

The S-76 has also served as a technology demonstrator for several projects. A one-off modification, the SHADOW (Sikorsky Helicopter Advanced Demonstrator and Operator Workload) programme saw an S-76 fitted with an add-on cockpit at the nose to test fly-by-wire, voice-actuated and side-stick control methods, together with helmet-mounted sights, FLIR and HUD combinations and an NVG cockpit. It was used extensively by Boeing/Sikorsky in their First Team submission for the US Army's LHX competition to test a night vision system. A second S-76 was fitted with an anti-torque tail-rotor system, as the Fantail Demonstrator, playing an important part in the selection of the First Team's design by the US Army as the RAH-66 Commanche.

Sales of the Spirit in all its civil forms were approaching the 500 mark by 1993.

VARIANTS

S-76: original production version, this designation applicable to aircraft delivered before 1 March 1982

S-76A+: unsold S-76s re-engined with Turbomeca Arriel turboshafts - on demand; produced to special orders only such as SAR aircraft for Royal Hong Kong Auxiliary Air Force with undernose GEC MRTS FLIR turret and searchlight

S-76 Mk II: production all-weather transport from 1 March 1982, superseded by S-76B

S-76 Utility: simplified version of S-76 Mk II with sliding doors, and optional fixed landing gear; available in civil or military versions

AUH-76: armed utility helicopter version, airframe basically as S-76 Utility, but with avionics and armament to permit deployment in various military roles

S-76B: current production version powered by Pratt & Whitney PT6B-36 turboshafts

S-76C: alternative current production version, powered by Turbomeca Arriel 1-S1 turboshafts.

S-76D: projected version available from 1994, to be powered by uprated Turbomeca 2S1s

H-76 Eagle: armed version of S-76B

H-76N: projected naval version announced in 1984; no orders received

D.Donald "The Complete Encyclopedia of World Aircraft", 1997

Sikorsky S-76

Technical data for Sikorsky S-76 Mk.II

Engine: 2 x Allison 250-C30S turboshaft, rated at 509kW, main rotor diameter: 13.41m, length with rotors turning: 16.0m, height: 4.41m, take-off weight: 4672kg, empty weight: 2540kg, cruising speed: 269km/h, service ceiling: 4570m, range with 12 passengers: 748km

Sikorsky S-76C+ commercial transport helicopter

Comments 
Jetcopters Inc., jetcoptersinc=gmail.com, 11.06.2014

Such a beauty, HX-1. We still have it. It still looks great. If you email me at the email listed, we will send you information and photographs on this marvelous helicopter. Have a great summer and email me today.

Status 3, j.sommerkorn=gmail.com, 02.06.2013

Hi, Quick question:
Could I use the drawing of the Helicopter (the black and white one)? It would be great if you could answer. Thanks!

hanna, hanna=mega-airlines.com, 04.04.2013

I would be interested to purchase engine for S-76A Model And More parts from A-76A Model.
Thank you

Erawan, erawan_aja=yahoo.com, 27.12.2012

I would sell some spare parts S76A helicopter..If you interesting send email to erawan_aja@yahoo.com

MINTHEIN, kominthein.mm=gmail.com, 06.06.2012

i like to know the different between s76, s76c, s76c+ and s76c++

jairo, credproinc=hotmail.com, 27.03.2012

who represents sikorsky hilicopters in south america.
please we need information.
thanks

shoes, shoeswang=aol.com, 16.06.2011

Please provide specs and pricing. Recommendation for a training facility or school would also be helpful.

Augie, 29.05.2011

Great aircraft. Who represents Sikorsky aircraft in SA?

Ha ha, I have to laugh, wanting to purchase 4 multi million dollar aircraft and seeking info on this site?

Dan, rocket-dan=juno.com, 13.01.2011

Another correction: the S-76D model will have the Pratt & Whitney PW210S engine installed. Sikorsky is currently working certification approval for the S-76D aircraft.

Dan, rocket-dan=juno.com, 13.01.2011

I would like to add some corrections to your very nice S76 History. The S-76C model has the Arriel 1S1 engine, the S-76C+ has the Arriel 2S1 engine and S-76C++ has the Arriel 2S1 engine.

byron532003@yahoo.com, 10.02.2010

Would appreciate if you would forward info and specs on a 12 seater passenger helicopter. Negotiations to develop a project on a private island in the Bahamas and the initial mode of transportation might include the use of a helicopter to transport staff, etc.

Please provide specs and pricing. Recommendation for a training facility or school would also be helpful.

APHENGINES, a.p.h. engines=gmail.com, 02.09.2009

FOR SALE:
RR ALL 250C20 ENGINE
RR ALL 250C20B ENGINE
RR ALL 250C30P ENGINE

PLS CONTACT US FOR MORE DETAILS

YOSI, a.p.h. engines=gmail.com, 23.08.2009

Dear A/C / Helicopter Operator,

My name is Yosi and I am a retired Air Force officer specialized in aircrafts engines and logistics.

In a period of economic crisis as the world faces now, it seems to be reasonable that companies are looking for alternatives in order to reduce their expenditures; therefore, I would like to offer you my assistance as follows:
*Finding overhauls and repair facilities for your turbo shaft / turbo prop engines & modules.
*Finding engines and modules for rent or exchange.
*Finding major engine spare parts in N/F, O/H or A/R condition.
I don't charge commission from A/C owners and operators.
Please don't hesitate to contact me.

Judy Kan, mikegme=szonline.net, 07.08.2009

I'm looking for some suppliers for aircraft spare parts of S-76A/S-76C++
We would appreciate if you can help us to find some suppliers.
Thanks

Richard Baker, rekabr=gmail.com, 01.05.2009

Worked on the S-76A with Petroleum helicopters in 88-90. Pilots loved it but, as I remember, it was a bear to maintain. All driveshafts, intermediate and tail rotor particularly, had to be shimmed and what a chore! Still a popular ship and it does have a sexy shape.

xxxxx, xxxxx, 23.02.2009

Check the color of Mr Bluett's money before parting with any yourself.

rodolfo lazareto, rodflaz_10=yahoo.com, 18.07.2008

My company is a duly authorized aircraft spare parts supplier here in the Philippines both military & commercial.We would appreciate if you can help us finding parts suppliers of S-76A

Richard M. David, rdavid=wellstoneglobal.com, 27.03.2008

My company represents Sikorsky in South Africa. I would appreciate being contacted directly by Mr. Richard Bluett. I am unable to contact him through the e-mail link.
Thank you.

George, spambox=ihug.co.nz, 23.03.2008

Greetings from New Zealand. Out daughter, nearly 7 yrs old now was born 15 weeks prematurely. Mum was flown to Auckland in a Sikorsky, which I understood was an S-76-A, but I see no -A designation here. We learned later that the power plants are Allison, so is this what you refer to as Mk-II? The operator is the the Northland Emergency Services Trust. See http://www.nest.org.nz/
They now have a second similar machine. The long range is useful when there is trouble offshore.. New Zealand has a very long coastline!
Keep up the good website work. Regards George, Auckland, New Zleand.

Richard Bluett, bigblu=xsinet.co.za, 20.11.2007

Who represents SIKORSKY HELICOPTERS in South Africa?

I would be interested in the S-76D model.

I am looking for FOUR new helicopters for my new mines in Southern Africa.

Do you have any comments concerning this aircraft ?

Name   E-mail

FACTS AND FIGURES

When configured for full day and night, all-weather offshore flying, the S-76 generally carries up to 12 passengers.

Sikorsky sold 428 S-76s to customers in Canada, Mexico, the UK and the US.

A harmonic control system tested on an S-76 reduced vibration by 90%.

The S-76 Shadow had a nose radar housing and fly-by-wire controls grafted onto the front section.

The S-76B is operated in China, Germany, Japan, Korea and the Netherlands.

The first S-76 prototypes flew in 1977 and deliveries began in 1979.


COMPANY
WEBSITE



All the World's Rotorcraft


Virtual Aircraft Museum


Back AVIATION TOP 100 - www.avitop.com Avitop.com