Sikorsky
Part IV
Back to Part III
Aug 26 1970 :
S-58T Twin Turbine
New turbine civilian version of the S-58
In a 1977 's issue,
Popular Mechanics
invite us to
Go where you've never gone before
with a S-58
Aug 27, 1970 :
S-67
1971 : S-68 Not built.
Oct 26, 1972 :
Igor Sikorsky dies due a heart attack at the age of 83. His
last day in his office at the Stratford plant of Sikorsky Aircraft was the day before
Jul 29, 1973 :
S-69 ABC (XH-59)
The ABC (Advancing Blade Concept) was designed to prove the viability of two
counter rotating main rotors on a common axis as a means of achieving higher speeds
and better agility
Its simple design eliminates the tail rotor for anti-torque and directional control. Rudders
in the twin tail are used instead, as in a fixed-wing aircraft
The concept also offers lower operating and maintenance costs. The ABC has been
extensively flight tested as a pure helicopter and, with auxiliary propulsion, flown at
speeds in excess of 480 km/h
This system had the additional advantage of eliminating noise caused by the tail rotor
and its transmission.
XH-59A serial number 73-21942.
Mar 1, 1974 :
S-65E Super Stallion (H-53E)
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Three engine version of the twin turbine H-53
(Notice 1 blade more in the main rotor)
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Load: 55 troops
Length: 22.48 m
Height: 8.66 m
Rotor diameter: 27.08 m
Disc Area: 455.36 m2
Weight: 15071 Kg Max: 33339
Engine: 3 General Electric T64-GE-416
of 4380 shp each
Speed: 260 km/h Max. 315
Range: 490 km
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Notice the tail making a 20° angle to offset the thrust required on the tail rotor to keep it straight.
The CH-53E was put in service in 1981.
Sikorsky VH-53F Super Stallion
Six units ordered for the USAF but with US Navy bureau numbers ( 159123 / 159128 )
for VIP transport by the 89th Military Airlift Wing.
These were cancelled before deliveries could take place.
Sikorsky S-71 :
Not built, was the Sikorsky entry for the AAH program. The models
chosen were the Hughes 77 (as the YAH-64) and the
Bell 409 (YAH-63)
Sikorsky S-73 :
Not built, was the Sikorsky entry for the HLH program. The model
chosen was the Boeing XCH-62
Oct 17, 1974 :
S-70 (H-60)
Oct 12, 1976 :
S-72 RSRA
Mar 13, 1977 :
S-76A
Originally designated Sikorsky S-74 was changed to tie-in with USA bicentennial.
Sikorsky used the H-76 Eagle unofficial designation to promote a military version of this model
Continue
Sikorsky Aircraft - Part 5
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