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Sikorsky S-72 helicopter

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Specifications Comment this helicopter
Picture S-72
General
Manufacturer Sikorsky
Type S-72
Introduced 10/12/1976
In production? No
Units produced 2
Price US $ 0.00
Dimensions
Overall Length 70.5 ft
Length 0 ft
Height 14.5 ft
Width 62 ft
   
   
Description

The S-72 RSRA was an experimental hybrid helicopter developed by Sikorsky of America. It first took flight in 1976.

The S-72 was a highly experimental attempt to combine fixed wing and rotorcraft features into one hybrid aircraft. It came about as a result of the Rotor Systems Research Aircraft (RSRA) project and was a collaboration between Sikorsky, NASA and the US Army. Essentially it provided a way for rotor properties to be tested in-flight.

The S-72 uses a highly-modified S-67 airframe. In addition, it used the main rotor from the S-61 as well as the roller gearbox from that craft. It was possible to fit the S-72 with two TF34 turbofans and wings. In fact, it could fly as a fixed-wing craft with no rotor at all!

Amazingly, the S-72 had an emergency crew extraction system. Explosive bolts sever the main rotor and egress panels are also blown off the roof. The crew then left the craft with the use of rockets.

The S-72 was a pure research craft that filled an important void in aircraft design research. It provided a safe way to test rotor performance in real-world conditions. Something that a combination of mathematical analysis and wind tunnel testing could not do.

One of the most famous test-bed roles of the S-72 is the X-Wing circulation control rotor concept. This rotor system could also act as a fixed wing when locked in place and it used a novel virtual wing surface made from ported compressed air to alter lift.

Ultimately, only one RSRA was made and the project proceeded no further.

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Design features
  • Modified S-76 fuselage
  • Two turboshaft engines and two turbofans for forward propulsion
  • S-61 dynamic system
  • Crew emergency extraction system (using ejector seats)
Description

The S-72 RSRA was an experimental hybrid helicopter developed by Sikorsky of America. It first took flight in 1976.

The S-72 was a highly experimental attempt to combine fixed wing and rotorcraft features into one hybrid aircraft. It came about as a result of the Rotor Systems Research Aircraft (RSRA) project and was a collaboration between Sikorsky, NASA and the US Army. Essentially it provided a way for rotor properties to be tested in-flight.

The S-72 uses a highly-modified S-67 airframe. In addition, it used the main rotor from the S-61 as well as the roller gearbox from that craft. It was possible to fit the S-72 with two TF34 turbofans and wings. In fact, it could fly as a fixed-wing craft with no rotor at all!

Amazingly, the S-72 had an emergency crew extraction system. Explosive bolts sever the main rotor and egress panels are also blown off the roof. The crew then left the craft with the use of rockets.

The S-72 was a pure research craft that filled an important void in aircraft design research. It provided a safe way to test rotor performance in real-world conditions. Something that a combination of mathematical analysis and wind tunnel testing could not do.

One of the most famous test-bed roles of the S-72 is the X-Wing circulation control rotor concept. This rotor system could also act as a fixed wing when locked in place and it used a novel virtual wing surface made from ported compressed air to alter lift.

Ultimately, only one RSRA was made and the project proceeded no further.

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Design features:
  • Modified S-76 fuselage
  • Two turboshaft engines and two turbofans for forward propulsion
  • S-61 dynamic system
  • Crew emergency extraction system (using ejector seats)
Performance
Persons 3
Max. Range 0 mi
Cruise Speed 160 mph
Max. Speed 230 mph
Max. rate of Climb 600 ft/min
HOGE ceiling 0 ft
Service Ceiling 0 ft
Gross Weight 26047 lb
Empty Weigt 21964 lb
Useful Load 4083 lb
Dynamic system
Fuel Capacity 0 gallons
Number of Engines 2
Engine Type Turbine
Engine Code General Electric T58-GE-5
Horse Power 1421
Rotorhead Subject under test
Number of rotorblades 5
Rotor Diameter 62 ft
Number of tail rotorblades 5
Tailrotor Diameter 0 ft
Blueprints & model
Manufacturer Website manufacturer..
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