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Sikorsky S-61

By Wikipedia,
the free encyclopedia,

http://en.wikipedia.org/wiki/Sikorsky_S-61L

S-61L/S-61N
HeliJet's S-61N at Vancouver International Airport
Role Medium-lift transport/airliner helicopter
Manufacturer Sikorsky Aircraft
First flight March 11, 1959
Introduction September 1961
Status Active service
Primary users VIH Aviation Group
CHC Helicopter

Bristow Helicopters
HeliJet

Number built 119[1]
Developed from SH-3 Sea King
Variants Sikorsky S-61R

A Canadian Helicopters Sikorsky S-61L at CFB Cold Lake in 1992
A Canadian Helicopters Sikorsky S-61L at CFB Cold Lake in 1992

A Bristow Helicopters S-61N operating for HM Coastguard
A Bristow Helicopters S-61N operating for HM Coastguard

A Carson Helicopters Fire King drops on the 2007 WSA Lightning Complex fire.
A Carson Helicopters Fire King drops on the 2007 WSA Lightning Complex fire.

A Carson Helicopters Fire King drops on the 2007 WSA Lightning Complex fire.
A Carson Helicopters Fire King drops on the 2007 WSA Lightning Complex fire.

A Helicsa S-61N operating for Sociedad de Salvamento y Seguridad Marítima.
A Helicsa S-61N operating for Sociedad de Salvamento y Seguridad Marítima.

An S-61 helitanker uses a snorkel to refill its internal water tanks
An S-61 helitanker uses a snorkel to refill its internal water tanks

The Sikorsky S-61L and S-61N are civil variants of the successful SH-3 Sea King helicopter. They are two of the most widely used airliner and oil rig support helicopters built.

Design and development

In September 1957, Sikorsky won a United States Navy development contract for an amphibious anti-submarine warfare (ASW) helicopter capable of detecting and attacking submarines. The XHSS-2 Sea King prototype flew on 11 March 1959. Production deliveries of the HSS-2 (later designated SH-3A) began in September 1961, with the initial production aircraft being powered by two 930kW (1250shp) General Electric T58-GE-8B turboshafts.

Sikorsky was quick to develop a commercial model of the Sea King. The S-61L first flew on 2 November 1961, and was 4ft 3in (1.27m) longer than the HSS-2 in order to carry a substantial payload of freight or passengers. Initial production S-61Ls were powered by two 1350shp (1005kW) GE CT58-140 turboshafts, the civil version of the T58. The S-61L features a modified landing gear without float stabilisers.

Los Angeles Airways was the first civil operator of the S-61 introducing them on 11 March 1962, for a purchased price of $650,000 each.

On 7 August 1962, the S-61N made its first flight. Otherwise identical to the S-61L, this version is optimized for overwater operations, particularly oil rig support, by retaining the SH-3's floats. Both the S-61L and S-61N were subsequently updated to Mk II standard with improvements including more powerful CT58-110 engines giving better hot and high performance, vibration damping and other detail refinements.

The Payloader, a stripped down version optimised for aerial crane work, was the third civil model of the S-61. The Payloader features the fixed undercarriage of the S-61L, but with an empty weight almost 2000lb (900kg) less than the standard S-61N.

Carson Helicopters was the first company to shorten a commercial S61. The fuselage is shortened by 50in (1.6m) to increase single engine performance and external payload.

A unique version is the S-61 Shortsky conversion of S-61Ls and Ns by Helipro International. VIH Logging was the launch customer for the HeliPro Shortsky conversion which first flew in February 1996.

One modification for the S-61 is the Carson Composite Main Rotor blade. These blades replace the original Sikorsky metal blades which are prone to fatigue. The Carson Composite Main Rotor blades permit a modified aircraft to carry an additional 2,000 lb (907 kg) load, fly 15 kn (28 km/h) faster and increases range 61 nmi (113 km).

Variants

S-61L 
Non-amphibious civil transport version. It can seat up to 30 passengers (13 Built).
S-61L Mk II 
Improved version of the S-61L helicopter, equipped with cargo bins.
S-61N 
Amphibious civil transport version.
S-61N Mk II 
Improved version of the S-61N helicopter.
S-61 Payloader 
Stripped down machine optimised for aerial crane work; features the fixed undercarriage of the S-61L, but with an empty weight almost 900kg (2000lb) less than the standard S-61N.
S-61 Shortsky 
Shortened conversion of the S-61L and N, designed to increase single engine performance and external payload.

Operators

Former operators are marked by italics
 Brunei
  • Brunei Shell Petroleum
 Canada
 Spain
 Greenland
 Ireland
 Lebanon
 Maldives
 Netherlands
 Pakistan
 United Kingdom
 United States

Notable accidents


N300Y, the S-61L prototype, departing from Disneyland Heliport on a flight five years prior to its accident flight.
N300Y, the S-61L prototype, departing from Disneyland Heliport on a flight five years prior to its accident flight.

Specifications (S-61N Mk II)

Data from International Directiory of Civil Aircraft

General characteristics

  • Crew: 2 pilots
  • Capacity: up to 30 passengers
  • Length: 58 ft 11 in (17.96 m)
  • Rotor diameter: 62 ft (18.9 m)
  • Height: 17 ft 6 in (5.32 m)
  • Disc area: 3,019 ft² (280.6 m²)
  • Empty weight: 12,336 lb (5,595 kg)
  • Loaded weight: lb (kg)
  • Max takeoff weight: 19,000 lb (8,620 kg)
  • Powerplant:General Electric CT58-140 turboshafts, 1,500 shp (1,120 kW) each

Performance

See also

Related development

External links




Text from Wikipedia is available under the Creative Commons Attribution/Share-Alike License; additional terms may apply.


Published - July 2009














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