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Post Info TOPIC: Research for book on the H-6/Model 500 Series of helicopters.


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Research for book on the H-6/Model 500 Series of helicopters.
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I am carrying out research for a proposed book on the prototype, test and special use versions of the H-6/H500 family of helicopters. My research is going quite well but there are a few versions that are difficult to get much information on. So if anyone can offer any information or photos of the following versions of the H-6/500 family, I would really appreciate it.

1. The Hughes OH-6B. This helicopter was a proposed improved version of the U.S. Army's OH-6A that McDonnell Douglas hoped to interest the U.S. Army in. I think about 8 helicopters were converted to OH-6B standard before the programme was cancelled in 1991. Does anyone have a list of the serials of all the aircraft converted and does anyone have a photo of an OH-6B?
2. The MD520L and MD530K and Black Tiger programmes. Does anyone have any information or photographs of these helicopters. As far as I know, the 530K and Black Tiger were built as prototypes and flew but I have no photos of either helicopter.
3. If anyone has any photos of any prototype versions of the H-6/500 family, please post them up. They might be of a version that I haven't yet discovered.
4. Does anyone have any drawings of any proposed versions of the H-6/500 series that were never built or flown?
Thanks for any help anyone can offer.
500 Fan.



-- Edited by 500 Fan on Sunday 16th of January 2011 10:10:38 PM



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I think here is a photo of the OH-6B.

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555


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Pepper, the photo you posted is of the OH-6D, not the B.

Some additional info on the specific ones you mentioned, 500 Fan.


OH-6B: First used in the mid-sixties to identify a proposed development which remained on the drawing board, the OH-6B designation was given in 1988 to OH-6As which were to be rebuilt and modernized in the Mississippi Army National Guard's Aviation Classification and Repair Activity Depot (AVCRAD) at Gulf port, Mississippi. As part of the modernization programme, 250 OH-6Bs are being (1) brought to a common Series IV standard to improve their maintainability and increase their capability; (2) re-engined with the 420shp Allison T63-A-720 engine with the 'Black Hole' system on the engine exhaust; and (3) fitted with wire strike protection, adjustable landing light, and modernized avionics (including FLIR sensor). The first of three OH-6B prototypes was flown at Gulfport in May 1988 and was assigned to the Maryland ArNG for operational evaluation.

MD 520L: This version, which was introduced in 1989, differed from the MD 520E in being fitted with a five-bladed main rotor with a diameter of 8.66m, a four-bladed tail rotor of 1.45m diameter, and a 14cm longer tail boom. Power is provided by the Allison 250-C20R turboshaft derated to 375shp.

MD 530K: This version, which was certificated in August 1988, differed from the MD 530F in being fitted with the longer tail boom and larger main and tail rotors of the MD 520L.


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I think this is from the Black Tiger program, but I can't be sure.



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-airfoil- wrote:

I think this is from the Black Tiger program, but I can't be sure.


From a poster at SPF:

Started in 1968, the Quiet One, an OH-6A Loach was modified to conduct a classified mission in December of 1972, to deploy a group of trained Laotian commandos into North Vietnam to tap into communication lines connecting NVA commanders. All operations were to be conducted at night. Pictures courtesy of Air & Space.

BTW, 500 fan you might find this doc useful: ;)

http://www.dtic.mil/cgi-bin/GetTRDoc?AD=ADA014640&Location=U2&doc=GetTRDoc.pdf



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Its mentioned in different places that the MD-520L was used in developing the OH-6 NOTAR demonstrator.

Look here:


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A Hughes 500 I don't know of which kind.



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Air_Gopher wrote:

A Hughes 500 I don't know of which kind.


 

Google Translate will tell you thats the MD-500-TOW Defender for Kenya Air Force. :P



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500 Fan wrote:
3. If anyone has any photos of any prototype versions of the H-6/500 family, please post them up. They might be of a version that I haven't yet discovered.

 

From "McDonnell Douglas Aircraft since 1920: Volume II", 1997, by Rene J. Francillon...

The first YOH-6A (62-4212) with temporary civil registration.



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555


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Same source; 68-17230, the OH-6A modified for the Higher Harmonic Control research program.

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500 Fan wrote:
1. The Hughes OH-6B. This helicopter was a proposed improved version of the U.S. Army's OH-6A that McDonnell Douglas hoped to interest the U.S. Army in. I think about 8 helicopters were converted to OH-6B standard before the programme was cancelled in 1991. Does anyone have a list of the serials of all the aircraft converted and does anyone have a photo of an OH-6B?


Same source...



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555


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Also a rare photo of TF-GRO, a float-equipped Hughes 500C in Iceland.

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555 what about the one in your avatar pic?

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There was also an ASW version used by the Spanish Navy. I can't find a thing on it so it might be of interest with the list of "little-knowns".

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failcopter67 wrote:

There was also an ASW version used by the Spanish Navy. I can't find a thing on it so it might be of interest with the list of "little-knowns".




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Thanks Air Gopher!!

And here is more on the OH-6A NOTAR variant:

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hannetonIII wrote:

555 what about the one in your avatar pic?



To be honest I do not know anything about it nor do I know where I got the pic.

There is a Flight article with a similar modification but no info:

http://www.flightglobal.com/pdfarchive/view/1973/1973%20-%201400.html?search=aircraft+project+1978



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Leela25 wrote:
From a poster at SPF:

Started in 1968, the Quiet One, an OH-6A Loach was modified to conduct a classified mission in December of 1972, to deploy a group of trained Laotian commandos into North Vietnam to tap into communication lines connecting NVA commanders. All operations were to be conducted at night. Pictures courtesy of Air & Space.


 

See also:

http://www.airspacemag.com/military-aviation/the_quiet_one.html?page=1



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Thanks to everyone for their contributions to my request for help. You have thrown up some very interesting information that has helped my project greatly. 555, your photo of the OH-6B has made my day! I think I will have to get my hands on that book. It looks like it is full of useful information.

If anyone else has anything that they think might be useful, please add it. Thanks.
500 Fan.


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555


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I am glad I can help! And just to let you know, you don't have to get the book. Most of the same text can be found at Stingray's site:

The book being credited to indicate addition for educational purposes and no intention of copyright infringement.

Also I am searching for information about the unidentified modification you see in my avatar pic (left).


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If I remember right, I think Nagler proposed a sort of flying "pod" helicopter for naval purposes and the airframe was clearly based on the Hughes 500. Anyone got the concept art?

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555, here is a link to something very like your avatar;


It looks like it was a fore-runner for the MD902 Series.

Thanks for the link to the info page. I have read quite a bit about the OH-6B but I had never actually seen a photo of it. It got me wondering, "Did it really exist, because I can't find a photo of it?" That's why that photo of the OH-6B is so important. Thanks for posting it.

Stingray, I have the drawing you are looking for but I can't find where I got it. I will try to post it up soon. Thanks.
500 Fan.


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Stingray wrote:

If I remember right, I think Nagler proposed a sort of flying "pod" helicopter for naval purposes and the airframe was clearly based on the Hughes 500. Anyone got the concept art?


 

I believe you are referring to this. This is the Nagler Model 255 light helicopter with Allison 250-C20B turboshaft engine.



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Yes, the Nagler Model 255 Shehana. And before that there was the Model 205 project, also based on a Hughes 369.

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555


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500 Fan wrote:

555, here is a link to something very like your avatar;

It looks like it was a fore-runner for the MD902 Series.
Thanks for the link to the info page. I have read quite a bit about the OH-6B but I had never actually seen a photo of it. It got me wondering, "Did it really exist, because I can't find a photo of it?" That's why that photo of the OH-6B is so important. Thanks for posting it.

 

Thanks for clarifying that mystery of mine.

And you are welcome regarding the OH-6B. biggrin



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500 Fan wrote:
Stingray, I have the drawing you are looking for but I can't find where I got it. I will try to post it up soon.

 

Would love to see it. wink



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Sorry, Stingray. The image I was referring to is the one in Stargazer's last post.

500 Fan.


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OH-6A drawing from the Flight Image Archive:

http://www.flightglobal.com/imagearchive/Galleries/Cutaways/Rotary-Wing/Helicopters-Military/images/Hughes-500_OH-6A.jpg


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Leela25 wrote:

-airfoil- wrote:

I think this is from the Black Tiger program, but I can't be sure.


From a poster at SPF:

Started in 1968, the Quiet One, an OH-6A Loach was modified to conduct a classified mission in December of 1972, to deploy a group of trained Laotian commandos into North Vietnam to tap into communication lines connecting NVA commanders. All operations were to be conducted at night. Pictures courtesy of Air & Space.

BTW, 500 fan you might find this doc useful: ;)

http://www.dtic.mil/cgi-bin/GetTRDoc?AD=ADA014640&Location=U2&doc=GetTRDoc.pdf


 

Hi Leela, the Quiet One can be found here too:

http://cs.finescale.com/FSMCS/forums/t/82613.aspx?PageIndex=3

http://cs.finescale.com/FSMCS/forums/t/119443.aspx?PageIndex=3



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Vietnam war-era OH-6A with door-mounted minigun and an armed OH-6G



-- Edited by Gunship on Monday 24th of January 2011 02:56:41 AM



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