Sikorsky S-69

Infobox Aircraft
name= S-69/XH-59


caption= Sikorsky S-69/XH-59 with auxiliary turbojets
type= Experimental helicopter
manufacturer=Sikorsky Aircraft
designer=
first flight= July 26 1973
introduced=
retired=
status=
primary user= NASA
more users= United States Army United States Navy
produced=
number built= 2
unit cost=
developed from =
variants with their own articles =

The Sikorsky S-69 was an experimental compound co-axial helicopter developed as part of the Advancing Blade Concept (ABC) program.

Design and development

Also known by the military designation XH-59A, the S-69 was part of the Advancing Blade Concept (ABC) program.Michael J Taylor: "The Illustrated Encyclopedia of Helicopters", page 20. Exeter Books, New York, NY USA, 1984. ISBN 0-671-07149-1] This Advancing Blade Concept system consisted of two rigid, contra-rotating rotors which made use of the aerodynamic lift of the advancing blades. At high speeds, the retreating blades were offloaded, as most of the load was supported by the advancing blades of both rotors and the penalty due to stall of the retreating blade was thus eliminated. This system did not even require a wing to be fitted for high speeds and to improve manoeuvrability, and also eliminated the need for an anti-torque rotor at the tail.

pecifications (S-69)

aircraft specifications

plane or copter?=copter
jet or prop?=both

ref=U.S. Army Aircraft Since 1947cite book |last= Harding|first= Stephen|authorlink= |coauthors= |title= U.S. Army Aircraft Since 1947|year= 1997|publisher= Schiffer Publishing Ltd.|location= Atglen, PA, USA|isbn= 96-69996| pages = 251] , Avia.Russian.ee Websitecite web|url=http://avia.russian.ee/helicopters_eng/sik_s-69-r.html|accessdate=2007-6-21|title=Sikorsky S-69 / XH-59]

crew= 2
capacity=
length main= 40 ft 9 in
length alt= 12.42 m
span main= 36 ft 0 in
span alt= 10.97 m
height main= 13 ft 2 in
height alt= 4.01 m
area main=
area alt=
airfoil=
empty weight main= lb
empty weight alt= kg
loaded weight main= lb
loaded weight alt= kg
useful load main= lb
useful load alt= kg
max takeoff weight main= 9,000 lb (without turbojets)
max takeoff weight alt= 11,000 lb (with turbojets)

engine (jet)=Pratt & Whitney J60-P-3A
type of jet=turbojet
number of jets=2
thrust main= 3,000 lbf
thrust alt= 1,350 kN
thrust original=
afterburning thrust main= lbf
afterburning thrust alt= kN

engine (prop)=Pratt & Whitney Canada PT6T-3 Turbo Twin Pac
type of prop=turboshaft
number of props=1
power main= 1,825 hp
power alt= 1,360 kW
power original=

propeller or rotor?=rotor
propellers=
number of propellers per engine=
propeller diameter main=
propeller diameter alt=
more general=
*Rotor: 2 three-bladed co-axial

max speed main= 322 mph, 518 km/h
max speed alt= 184 mph, 296 km/h
cruise speed main= knots
cruise speed alt= 125 mph, 185 km/h
never exceed speed main= knots
never exceed speed alt= mph, km/h
stall speed main= knots
stall speed alt= mph, km/h
range main= nm
range alt= mi, km
ceiling main= 15,000 ft
ceiling alt= 4,570 m
climb rate main=
climb rate alt=
loading main=
loading alt=
thrust/weight=
power/mass main=
power/mass alt=
more performance=

armament=

avionics=

ee also

aircontent
related=
* Sikorsky X2

lists=
* List of helicopters

see also=

References

External links

* [http://avia.russian.ee/helicopters_eng/sik_s-69-r.html Sikorsky S-69]
* [http://www.globalsecurity.org/military/systems/aircraft/h-59.htm Global Security.org Sikorsky XH-59 page]
* [http://www.sikorsky.com/details/0,3036,CLI1_DIV69_ETI2088,00.html Sikorsky X2]
* [http://www.flightglobal.com/articles/2007/06/12/214533/x2-marks-the-spot-for-radical-rotor-designs.html "X2 marks the spot for radical rotor designs" FlightGlobal]