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Post Info TOPIC: The LHX Program


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Date: Jul 1, 2011
The LHX Program
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I decided to create a separate thread on the LHX program since multiple companies have entered this competition.

--

Thanks to Paul (Overscan):

Some interesting info from USAF, 1985:

LHX/LOA requirements

  • Highly agile, manouverable, single seat conventional rotorcraft
  • Armament 4 Hellfire, 2 Stinger, 1 gun
  • Self deployable 1250 nm
  • 500fpm climb, 170kts (SCAT), 160kts (Utility) in hot & high conditions (4000ft, 95degF)
  • Transportable in C-5, C-17, C-141
  • Crashworthy design, wheel landing gear, NBC protection
  • Twin T800 turboshafts
  • 6 seats in utility version (space for eight)
  • Integrated targeting system
  • wide field-of-view optics
  • 8000lb +-500lb target mission gross weight for SCAT
  • Unit flyaway cost $6 million (SCAT), $4 million (Utility) in 1984 dollars
  • 70% commonality between SCAT and utility versions
  • 40-50% reduction in support and operating costs


-- Edited by Stingray on Sunday 3rd of January 2016 05:45:55 PM

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Concepts from the Bell/McDonnell-Douglas "Super Team":

Note that the first picture is an early Bell scout-attack (SCAT) configuration with ringtail before proposing usage of the NOTAR instead (Source: "Warplanes of the Future," Bill Gunston, 1986).

Last four are from "Bell Aircraft since 1935," Alain J. Pelletier.



-- Edited by Stingray on Sunday 3rd of January 2016 03:19:13 PM



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More Super Team:

First pic from "Stealth Warplanes," Doug Richardson, 1989.

Last one is a proposal for combining the Bell 680 rotor technology with the McAir NOTAR.



-- Edited by Stingray on Sunday 3rd of January 2016 03:32:40 PM

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Hughes' older scout-attack (SCAT) proposal (pre-McDD) with swept wings and NOTAR:

Note that the last picture depicts a model illustrating an alternate shape and scimitar main rotor compared to what has often been confused to be a supersonic fighter in the earlier illustrations.



-- Edited by Stingray on Sunday 3rd of January 2016 03:21:23 PM



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Bell BAT (disqualified from LHX)

First two pictures from "Warplanes of the Future," Bill Gunston, 1986, others from:

http://www.arcforums.com/forums/air/lofiversion/index.php?t202161.html



-- Edited by Stingray on Sunday 3rd of January 2016 03:55:14 PM

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Boeing-Vertol SCAT proposals, pre-Boeing/Sikorsky "First Team":



-- Edited by Stingray on Sunday 3rd of January 2016 04:19:21 PM

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Early Sikorsky SCAT concept utilizing the Advancing Blade Concept (ABC) with coaxial rotors - the inclusion of the shrouded pusher propeller was also an option:

Cutaway drawing from Army Aviation Digest, January 1983.



-- Edited by Stingray on Sunday 3rd of January 2016 04:31:33 PM

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Boeing/Sikorsky "First Team" proposals:

Note the evolution from the canted V-tail to a normal fantail with tailplane above the vertical fin.



-- Edited by Stingray on Sunday 3rd of January 2016 04:44:35 PM

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Another picture of the early Bell SCAT configuration, and a 3-view of the Super Team concept from "Stealth Technology: The Art Of Black Magic," J. Jones:



-- Edited by Stingray on Sunday 3rd of January 2016 04:48:35 PM

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Also labeled as Sikorsky concepts, but I'm not sure of the timframe because they have a bit of both ideas found in the Sikorsky SCAT and later First Team proposals:



-- Edited by Stingray on Sunday 3rd of January 2016 04:54:04 PM

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LHX-U was the utility option proposed alongside the main concept, envisioned for usages such as medevac, cargo, and troop transport.

First one is from Super Team, the others are from First Team:



-- Edited by Stingray on Sunday 3rd of January 2016 05:13:37 PM

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http://www.flightglobal.com/PDFArchive/View/1984/1984%20-%200383.html



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Can someone identify which team this LHX concept was from? I can't read PDFs on my computer at the present moment, for some odd technical reason.

http://www.flightglobal.com/PDFArchive/View/1983/1983%20-%201971.html?search=vfw%20AIRCRAFT%201988



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McDonnell Douglas/Bell Textron ads for the Super Team LHX. First is from December 1988, next two are from January 1991.

Fourth one found by Flateric (love this one).

Last one is from when Hughes became McDonnell-Douglas (note the original cigar-shaped Hughes concept illustrated by the wire-frame graphics). Dated March, 1986.



-- Edited by Stingray on Sunday 3rd of January 2016 05:25:52 PM

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Boeing/Sikorsky First Team LHX ad, May 1990:



-- Edited by Stingray on Sunday 3rd of January 2016 05:30:06 PM

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LHX concept art, form which design team?



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Top: Bell/McDonnell-Douglas LHX

Bottom: Boeing/Sikorsky LHX

http://www.flightglobal.com/pdfarchive/view/1989/1989%20-%202856.html



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Stingray wrote:

http://www.flightglobal.com/PDFArchive/View/1984/1984%20-%200383.html


 

This is just an example for a general advanced attack helicopter, from Boeing-Vertol. 

 

Stingray wrote:

LHX concept art, form which design team?


 

Sikorsky, but this is a submission to the X-Wing program projected to use a "convertible"-modified version of the TF34 engine.



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The Bell/McD-D concept appears in LHX Attack Helicopter, an awesome game. biggrin

1-3570_2.jpg



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Boeing/Sikorsky LHX Microwest desktop model:



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LHX design (possibly by Boeing-Vertol) being tested in NASA's wind tunnel:

http://books.google.com.eg/books?id=e-MDAAAAMBAJ&pg=PA50&dq=LHX+helicopter&hl=ar&ei=Q9O-TLLMEIOaOuq1qEc&sa=X&oi=book_result&ct=result&resnum=19&ved=0CG0Q6A
EwEg#v=onepage&q&f=true



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Stingray wrote:

Boeing/Sikorsky LHX Microwest desktop model:


 

Getting awful close to the Comanche we all know and love.

Northrop also had a submission to the LHX program in 1985, similar to some McDonnell-Douglas concepts while utilizing stopped X-Wing rotors much like Sikorsky's program.



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Sidewinder wrote:
Stingray wrote:

Boeing/Sikorsky LHX Microwest desktop model:


 

Getting awful close to the Comanche we all know and love.

Northrop also had a submission to the LHX program in 1985, similar to some McDonnell-Douglas concepts while utilizing stopped X-Wing rotors much like Sikorsky's program.


 

You mean this? It was a sole entry to the X-Wing program. The two engines were placed vertically on top of each other along the longitudinal axis of the aircraft's fuselage to reduce size and weight.

According to the patent, The engines provide the drive mechanism for the rotor via a common gear box, drive an air compressor utilized to provide compressed air in a controlled manner through slots formed on the blades of the X-wing, and provide the propulsive force for the aircraft. The engines are also utilized to provide pitch and yaw capability. Each engine and the core jet stream therefrom is ducted to a rectangular shaped nozzle having vectoring flaps for pitch control. The vectoring flaps also act as nozzle blockers in conjunction with the left and right hand side vectoring cascades used for yaw control. Additional pitch and yaw control may be provided by a control surface formed on the underside of the aircraft fuselage forward of the lower side cascades.

It was also intended to have an ejection seat for emergency situations, though the aircraft would have to stay in fixed-wing flight or have detachable rotor-wings in order for the pilot to successfully pass the general area of the rotor disk.

The full patent is floating around somewhere in the appropriate section of this forum.



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See US Patent #4711415 in Google Patents.

I use to have a color concept of Northrop's scout-attack X-Wing but it seems to have disappeared from my computer. I'll post it up as soon as I find it.



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First Team LHX/

http://www.flightglobal.com/pdfarchive/view/1989/1989%20-%202174.html?search=lhx



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SuperTeam LHX concept model.

http://www.flightglobal.com/pdfarchive/view/1989/1989%20-%200496.html?search=lhx



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Stingray wrote:

See US Patent #4711415 in Google Patents.

I use to have a color concept of Northrop's scout-attack X-Wing but it seems to have disappeared from my computer. I'll post it up as soon as I find it.


 

I've seen it elsewhere myself. If memory serves me correctly, it was the same patent drawing colored for a web site or news agency.



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Right you are Ace, and I still can't find my copy. It might have been deleted during an information transfer between my two PCs, and I have it printed out in my "North America" volume of my binder "archives" under my bed, but not only is it complete hell to get to at the moment, but the print is in black-and-white. You're better off with the original patent drawing for now until I find a better copy of the color version.



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Stingray wrote:

Bell BAT (disqualified)


 Why was it disqualified from the program? Did it not properly fulfil requirements being a tilt-rotor configuration?



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The requirements were changed sometime after Bell completed the BAT (Bell Advanced Tiltrotor) mockup. It had similar provisions for internally-stored armament, but it's weight was a problem since newer LHX requirements included a weight limit of under 3150kg. The BAT was 3600kg.



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