While this is true Sarah, don't forget the fact that it's coaxial. Sure it counteracts the dissymmetry of lift but it also relieves stress by having the other rotors.
Από κάθε γενιά μεταξύ κάθε έθνος ανθρώπων, να θυμάστε νεκρών στρατιωτών μας.”
Wishing you the best of luck Dave
Here I have scans of the R-6A from "American Helicopter" magazine, December 1945, pages 10-12.
The R-6 for frost-control, from "American Helicopter" Magazine, May 1946, page 26.
Okay here I go. I Leela25 am about to embark on an epic journey.
I am going to list EVERY known Sikorsky designation, in the HannetonIII style designation list. Wish me luck and stay tuned! :D
Sikorsky S-1 - 1909 coaxial machine with 25hp Anzani engine.
Sikorsky S-2 - 1910 coaxial machine with the same engine, but the weight of the machine was too much for it.
Vought-Sikorsky VS-300 / S-46 - Experimental 3-blade heli with 75hp Lycoming 4-cylinder engine (then 90hp Franklin in 1940).
Sikorsky R-4 / VS-316A / S-48 - evelopment of VS-300, 3-blade two-seat heli. First helicopter to be mass-produced at a large scale.
Sikorsky R-5 / H-5 / S-51 / HO2S / VS-327 / Horse - Tandem two-seat 3-blade heli with 450hp Wasp Junior radial engine.
Sikorsky R-6 / Model 49 (?) - Light two-seat heli with 225hp Lycoming O-435-7 engine. (R-6 was developed parallel with the improved R-5 but was basically a refinement of the R-4 design)
----------------- Beginning with the R-6, helicopters flown by the U.S. Coast Guard had Navy designations with the suffix letter G (as HOS-1G) until the 1962 redesignation of U.S. military aircraft.
Sikorsky S-50 - Design study for a small two-seat helicopter, powered by a 150-horsepower engine. It had an estimated gross weight of 1,600 pounds. A full-scale wooden mock-up was completed in late 1943, but the S-50 was never built.
(possibly a planned R-5 development, or a design that led to S-51??)
Designation seems to also corrispond to the VS-327 (R-5 up to "E" version and HO2S).
Sikorsky S-51 / H-5 / HO3S - See R-5 list.
Sikorsky S-52 / H-18 - utility helicopter of 1940s.
Sikorsky S-53 - Four-seat military helicopter similar to S-51 with tricycle u/c, small tail rotor pylon, tailplane and powered by one 525hp Continental R-975-34 engine. Prot. Bu. 30368 FF 22 Sept. 1947. 3 built.
Sikorsky S-54 - See the R-4 list.
Sikorsky S-55 "Chickasaw" / H-19 / HO4S / HRS - Multi-purpose helicopter.
Sikorsky S-56 / CH-37 "Mojave" / HR2S - 1950s standard heavy-lift and flying crane heli.
---------- Rotor and gearbox served as basis for Westland Westminster development.
Sikorsky S-57 / XV-2 - Projected experimental stoppable-rotor convertiplane developed for a joint research program between the Air Force and Army. Prototype serial number 54-4403, but was never constructed.
Sikorsky S-58 / HSS "Seabat" / HUS "Seahorse" / CH-34 "Choctaw" - piston-engined military helicopter originally designed as an ASW heli.
Sikorsky S-59 - Army's first turbine-powered heli with 400shp Continental XT51 engine. Rejected in favor of the Bell XH-40 (later UH-1).
Sikorsky S-60 - Prototype twin-engined heavy-lift flying-crane derived from the S-56 in 1958. It was underpowered (with two 3020kW JFTD-12A turboshaft engines) and crashed in April 1961. The wreckage was transferred to the New England Air Museum in the 1970s, and is currently being restored by the Connecticut Air and Space Center in Stratford, Connecticut.
Sikorsky S-61 / SH-3 "Sea King" - Twin-engine ASW helicopter developed to replace the outdated S-58 (HSS-1).
Sikorsky S-61N, etc. - Covered in S-61 list, continued for further clarification.
Sikorsky S-61R / CH-3 / HH-3 "Jolly Green Giant" - Covered in S-61 list, continued for further clarification.
Sikorsky S-61F / NH-3 - SH-3A test heli with 9.75m-span wings supporting two 1350kg Pratt & Whitney J60 podded jet engines, which complimented the two General Electric T58-GE-8B turboshafts. First had a five-blade rotor but was later changed to a six-blade. It reached a level speed of 390km/h.
-----------Officially listed as an HSS-2, the U.S. Navy's BuNo. 148033
Sikorsky S-61D - Planned derivative of HH-3?
Sikorsky S-61 Advanced Sea King - ?
Sikorsky S-62 / HH-52 - Single-turbine sea-rescue heli originally developed as a commercial venture.
Sikorsky S-63 - Initial designation of the S-62B.
Sikorsky S-64 / CH-54 "Tarhe" - Twin-engine heavy-lift flying-crane. Was being developed at the same time of the S-60 project.
Sikorsky S-65 / CH-53 Sea Stallion - Family of Heavy-lift transport helicopters.
Sikorsky MH-53 Pave Low - Continued from CH-53 family list.
Sikorsky CH-53E Super Stallion (S-80) - Continued from CH-53 family list.
Sikorsky S-66 - Projected high-speed compound attack helicopter as an entry to the AAFSS competition in 1964. Lost to Lockheed AH-56 Cheyenne.
Sikorsky S-67 "Blackhawk" - Attack helicopter demonstrator with S-61 rotor and components, and two 1119kW General Electric T58-GE-5 engines. Developed in 1970 when the AAFSS competition was delayed and Lockheed AH-56 failed requirements. Abandoned after famous crash in 1974.
Sikorsky S-68 - US Army-funded Aerial Armoured Reconnaissance Vehicle (AARV).
Sikorsky S-69 / XH-59 - Experimental coaxial rotor compound heli designed to study the Advancing Blade Concept (ABC). Powered by single 1825shp PT6T-3 Turbo Twin Pac engine, with two 1350kg J60-P-3A turbojet engines for compound flight. First prototype 73-21941 crashed and was later used as a NASA wind-tunnel test article.
Sikorsky S-70 "Black Hawk" - Medium transport/utility heli developed in response to the Army's 1972 UTTAS program to replace the UH-1 series. Competed with the Boeing-Vertol YUH-61A, which lost in 1976.
Sikorsky SH-60B "Sea Hawk" / SH-60F "Ocean Hawk" - See S-70 list.
Sikorsky EH-60A "Quick Fix II" - See S-70 list.
Sikorsky S-71 - Proposed attack helicopter using dynamic components from the S-70. Was an entry to the AAH program, in which it lost to the Hughes 77 (YAH-64) and the Bell 409 (YAH-63).
Sikorsky S-72 RSRA / X-Wing / S-72X1 - Experimental hybrid helicopter/fixed-wing aircraft with two General Electric TF-34 turbofans in two outboard nacelles, which complimented the two 1044kW General Electric T58-GE-5 turboshaft engines. Funding was pulled in the late 1980s and flying demonstrator placed in storage at Edwards AFB.
Sikorsky S-73 - Sikorsky's entry for the HLH program, lost to the Boeing XCH-62.
Sikorsky S-74 - Original designation for S-76. The number "76" was chosen instead to coincide with the 1976 bicentennial, as it made it a better sounding commercial designation.
Sikorsky S-75 ACAP - Proof-of-concept all-composite heli developed as part of the Army's Advanced Composite Airframe Programme (ACAP). Performance compared with Bell D-292 ACAP. Apparently it was found to have exceeded the weight- and cost-saving criteria set by the Army in the original ACAP specification.
Sikorsky S-76 "Spirit" - Medium-size commercial utility heli using similar blades to the S-70.
Sikorsky S-77 - ?
Sikorsky S-78 (+) - See S-70 list.
Sikorsky S-79 - ?
Sikorsky S-80 / CH-53E / MH-53E - See CH-53 family list.
???? - ???? (just assuming there's more designations)
Sikorsky S-90 - ?
Sikorsky S-92 - Four-blade twin-engine medium-lift heli developed from the S-70.
Sikorsky "Cypher" - UAV consisting of two four-blade contra-rotating rotors, driven by a 52hp UEL AR 801 rotary engine, inside a 1.95m diameter graphite/epoxy shroud.
Sikorsky MARINER / "Cypher II" / "Dragon Warrior" - (MARIne-Navy Extended-range Reconnaissance) UAV developed in conjunction with General Dynamics Information Systems, selected by the US Marines for testing UAV operating concepts and payloads.
Sikorsky Universal Tactical Vehicle (UTV) - Unknown flying-crane project.
Sikorsky SH-X - Unknown navy project.
Sikorsky X2 - Experimental coaxial-rotor compound heli with pusher tail rotor. There are six proposed variants:
Sikorsky S-97 "Raider" - Proposed high-speed scout and attack helicopter based on the X2 technology demonstrator. First prototype planned to fly in late 2013 or early 2014 near the release of the Armed Aerial Scout Request for Proposals.
Sikorsky / Raytheon UCAR - (Unmanned Combat Armed Rotorcraft), an all-weather, highly autonomous and survivable unmanned rotorcraft fully integrated into the Army's objective force combat maneuver force structure.
Sikorsky DS-103 - Missile-carrier flying-crane study.
Sikorsky DS-160 - Flying-crane study.
Sikorsky DS-233 - ?
Sikorsky S-434 - A project originally by Schweizer, now Sikorsky since the purchase of the company.
Sikorsky S-2000 - Possible designation for S-76 fantail demonstrator?
LHX - (Light Helicopter Experimental), Boeing and Sikorsky (as "First Team"). Program was a 1980s Army project to replace the AH-1 Cobra and OH-58 helicopters with an all-composite and and advanced military helicopter.
-- Edited by Leela25 on Sunday 5th of February 2012 12:40:39 AM
I think I do. There's some in the list I don't know about and I think there are some missing ones. :P
Wow, what an amazing list!!!!!!
I didn't even know there were so many S-70 developments out there!!!!
Leela25 wrote:I am going to list EVERY known Sikorsky designation, in the HannetonIII style designation list.
I am going to list EVERY known Sikorsky designation, in the HannetonIII style designation list.
*looks over list*
Glad you like it! :D
Seriously you've done an incredible job utilizing my style. And BTW, how did you do the sublist-within-a-sublist, i.e. the Westland "Dragonfly" variants?
Leela25 wrote:XH-59B - Unused proposal for configuration with advanced rotors, new powerplant (two GE T700s), and a ducted pusher propeller at the tail.
I'm going to be loose with the rules and share it here before I forget:
(from "Warplanes of the future", Bill Gunston)
hannetonIII wrote:BTW, how did you do the sublist-within-a-sublist, i.e. the Westland "Dragonfly" variants?
BTW, how did you do the sublist-within-a-sublist, i.e. the Westland "Dragonfly" variants?
I can tell you that's a simple html trick, like so:
Okay Leela, I looked over the list again and you're missing these:
S-63: Initial designation of the S-62B
S-68: US Army-funded Aerial Armoured Reconnaissance Vehicle (AARV)
S-78: Alternate designation of S-70C-20
S-434: A project originally by Schweizer, now Sikorsky since the purchase of the company.
S-2000: (Need clarification... S-76 fantail demonstrator?)
DS-103: Missile-carrier flying crane study
DS-160: Flying-crane study
Probably should include the RAH-66 Comanche and Piasecki X-49A in the list as well. The Piasecki one I suggest being in the S-70 sublists.
As I know,
S-90 (propably a folded tail rotor,a smaller helicopter than
S-97 well known helicopter.
S-78-29 was 29 passenger helicopter, a civil version of S-70 with
enlarge cabin and retractable undercarriage,it had a new
hesham wrote:S-78-29 was 29 passenger helicopter, a civil version of S-70 with enlarge cabin and retractable undercarriage,it had a new shape.
S-78-29 was 29 passenger helicopter, a civil version of S-70 with
Interesting. Does the "-29" part of the designation indicate the seat number? Like the CTR designs by Bell?
"I love the smell of CGI in the morning..."
Sidewinder wrote:hesham wrote:S-78-29 was 29 passenger helicopter, a civil version of S-70 with enlarge cabin and retractable undercarriage,it had a new shape. Interesting. Does the "-29" part of the designation indicate the seat number? Like the CTR designs by Bell?
hannetonIII wrote:Leela25 wrote:I am going to list EVERY known Sikorsky designation, in the HannetonIII style designation list. *looks over list*-- Edited by hannetonIII on Sunday 5th of February 2012 01:00:08 AM
-- Edited by hannetonIII on Sunday 5th of February 2012 01:00:08 AM
I hope that pic spawns a forum meme.
Also EPIC list, Leela25!!!!!!!!
Vince Johnson - A merciless enemy but a powerful ally.
Actually I think EH-60A is the "Quick Fix II", not the YEH-60B. Though the first S-70 platform to carry the name is a mystery to me.
S-74 was original designation of S-76.
hesham wrote:Hi,S-74 was original designation of S-76.
Thanks Hesham, but it was covered already in Stephane's post:
Stargazer2006 wrote:S-74 was the original designation for the S-76. The number "76" was chosen instead to coincide with the 1976 bicentennial, as it made it a better sounding commercial designation.
ZOMG thanks guys, I just added those!! :D
SuperStallion wrote:Actually I think EH-60A is the "Quick Fix II", not the YEH-60B. Though the first S-70 platform to carry the name is a mystery to me.
I thought that too but chronologically it doesn't make sense, so I renamed them how I felt was right. :P
Regarding the CH-53K
Burn Rubber does not mean Warp Speed!