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


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RE: Research for book on the H-6/Model 500 Series of helicopters.
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OH-6 with side-mounted grenade launchers

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Alan Dallas


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More OH-6A ''Borrowed Time'' with door minigun



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Alan Dallas


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OH-6A 66-07915 of B troop 7th Squadron 17th Cavalry at Camp Enari, Vietnam in 1968; it was armed with XM27 minigun subsystem on the left side and a four-tube rocket launcher mounted on the right side. The rocket launcher was not an in-the-field modification but an experimental unit developed by the Rock Island Arsenal.

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Alan Dallas


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Nice finds Alan! And here is an OH-6 with a rocket system I can't ID.

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Gunship wrote:
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


 

Plus much more:

 

Initial version of this helo (NOH-6A) was built by the Hughes under Army/ARPA programme and was named ''the Quiet One''. In fact it was so silent that it could not be heard when passing overhead at 300ft under normall ambient background sounds! The Army stopped there, but the project cought the eye of the CIA, who wanted to place wire taps on North Vietnamese communication lines. So the Hughes built an improved version designated NOH-6P/Hughes 500P.

The heart of reducing the sound signature of the loach was a new 5-bladed main rotor with titanium hub and blades with 8-inch trapezoidally shaped tips that reduced tip vortexing (and by that the sound signature). Also a more powerfull -20 Allison enigine was installed with water/ethanol injection system that boosted engine power for take-offs. Tail rotor was replaced with a 4-bladed staggered mounting unit and 3.5-inches longer blades and was also mounted more to the rear to compensate for longer blades (some sources claims that main rotor blades were also longer, but I am not 100% sure of that). Engine and transmission compartments were fitted with sound-proofing material, engine intake was shrouded to further reduce trasmission/engine whine, exhaust was fitted with a resonator to lower the roar of the engine, ... All the gears and transmission elements were smoothened to eliminate ''grinding'' noises. The extra main rotor blade allowed the bird to operate at 66% normal rotor rpm (an important contributing factor to reducing noise levels).

LORAN C and INS navigation systems were fitted inside two aerodynamic pods mounted on both sides of the chopper. OH-6Ps were equiped with Radar altimeter and Radar Warning Receivers. AN/AAQ-5 FLIR with two liquid nitrogen coolant bottles was installed under the chin. Some Infra-red spot lights were fixed to skids and fuselage of the Quiet ones to enhance performance of SU-50 NVGs worn by the pilot. Of course, radical modifications to the co.ckpit were also done.

Below is the original Army/ARPA NOH-6A.




-- Edited by Gunship on Friday 28th of January 2011 12:11:40 AM



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Alan Dallas


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Some pics of the CIA-operated Hughes 500P in Vietnam.



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Photo of a NOH-6P taken in the early 1990s with a FLIR turret (possibly the original AN/AAQ-5 turret) and main rotor tips in some detail (the larger nose mounted FLIR turret was a later addition; not used in 1972).

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Alan Dallas


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there is a version of the H-6 without a tail rotor, and in its place a long bulb, my dad said it was a anti-magnetic pod to stabilise the helo

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Little Bird for ASW role



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Taiwan ASW version



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Unmanned Little Bird A/MH-6X MELB / AH-6S

 

Click this bar to view the original image of 800x446px.



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Unidentified model

http://img51.imageshack.us/img51/8631/helos009.jpg



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Thanks AG. That helicopter is the RACA-Hughes 500D Avispa Gunship. It is a licence-built 500 made in Argentina and flown by the Argentinian Air Force. The yellow markings are usually only applied to helicopters used for fire-fighting so it's odd to see the markings on this gunship, but maybe they took the guns and rockets off and went firefighting with a "Bambi" Bucket.  



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scorpio213 wrote:

there is a version of the H-6 without a tail rotor, and in its place a long bulb, my dad said it was a anti-magnetic pod to stabilise the helo


 

Hi scorpio213, do you have a link for this modification? I have never heard of it before.



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There was no such thing. Either he made it up to cover up the fact he knows absolutely nothing about helicopters other than what he copied from Wikipedia, or he's just indicating the OH-6 NOTAR and thought it was something else.



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Alan Dallas


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MD 500 Air Conditioning System http://www.integratedflightsys.com/products/airconditioning/md-500



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Hughes OH-6D prototype for the AHIP program



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Cool! What is the AHIP program exactly?



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555


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Happy coincedence? 500 fan just posted the results of a model project based on this prototype at SPF.



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Any pics, 555?



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Of course, and there's even a scan for a color version of AG's picture.

http://www.secretprojects.co.uk/forum/index.php/topic,12827.msg126539/topicsee
n.html#msg126539



-- Edited by 555 on Tuesday 31st of May 2011 12:04:02 AM

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Pepper wrote:

Cool! What is the AHIP program exactly?


 

The Army Helicopter Improvement Program (AHIP) was to provide a Near-Term Scout Helicopter (NTSH) as an interim aircraft pending development of the LHX. This OH-6D was one of the contenders but lost to the Bell 406 (OH-58D) on 21 September, 1981.



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Alan Dallas


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As Alan has said, the Hughes OH-6D was Hughes' entry in the Army Helicopter Improvement Program competition for an upgraded scout helicopter that could work with the AH-64A Apache. Bell won with the OH-58D Kiowa. Bell didn't build a prototype during the intial phase of the competition but Hughes did. It is actually very interesting to see how similar the OH-6D looks to the OH-58D with its blanked-off rear door. Hughes were ahead of the times with their design. The drawing of the OH-6D dates from a magazine published in 1983. That drawing inspired this model and the research I have been doing into my proposed book. The model isn't absolutely 100% accurate but I'm generally happy with it. It is based on the 1/72 Italeri OH-6A kit. I hope this is of interest.

 

https://i306.photobucket.com/albums/nn274/Bolkow1/OH-6D/oh-6Dart.jpg

 

 

 

 

 

 

https://i306.photobucket.com/albums/nn274/Bolkow1/OH-6D/IMG_0489.jpg

 

https://i306.photobucket.com/albums/nn274/Bolkow1/OH-6D/P1010136.jpg

500 Fan.



-- Edited by 500 Fan on Thursday 9th of June 2011 03:36:37 PM



-- Edited by 500 Fan on Friday 15th of July 2011 09:52:00 PM



-- Edited by Stingray on Thursday 9th of August 2012 09:43:04 PM

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This Air America H-6 might be one of the Quiet One aircraft converted in Vietnam:



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From Nico, the Hughes Model 500 ASW Defender. It was not a part of the LAMPS competition, despite looking strikingly close to the demonstrator.



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From "Helicopters: Military, Civilian and Rescue Rotorcraft", Robert Jackson, 2005:



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