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Post Info TOPIC: Boeing / Sikorsky RAH-66 "Comanche"


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Date: Apr 2, 2012
Boeing / Sikorsky RAH-66 "Comanche"
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1. RAH-66 first shown to the public.

2-4. First flight, 1996

5. rear avionics compartment

6. engine and rear equipment bay

7. front landing gear

8. missile bay

9-10. co.ckpit

11. Helmet-mounted display

12. layout of removable panels



-- Edited by Leela25 on Tuesday 2nd of December 2014 01:09:32 PM

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Date: Apr 2, 2012
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1. cutaway

2. diagram of structure

3-4. missile configuration

5. Weapon types

6. Gun diagram

7-8. 3-views



-- Edited by Leela25 on Tuesday 2nd of December 2014 01:16:24 PM

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Leela, you WILL send me the original full-size pics of the ones you posted!

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Flyboy's Site



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Flyboy wrote:

Leela, you WILL send me the original full-size pics of the ones you posted!


 

huge.png?1326712342

 

Consider it done! ;)



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Leela25 wrote:
Flyboy wrote:

Leela, you WILL send me the original full-size pics of the ones you posted!


Consider it done! ;)


 

Flyboy, heed the words of the old and wise... When asking someone for something (especially a girl, and especially a girl you fancy) it doesn't hurt to add the magic word "Please"... Makes it so much nicer!

I believe that's the original size of the pics, they're from a Russian site if I'm not mistaken.



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Leela25 - Thanks for sending the piccies, you deliver EVERY time!  wink

Stargazer2006 - I intentionally wanted to sound like a kind of dominant, ill-mannered neanderthal. It was just a joke.  evileye

Please allow me to publicly apologize to you, Leela25, but I'm sure that you didn't take offense. Sorry.



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No worries, I was also pulling your leg... wink



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Stéphane



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Flyboy wrote:

Leela25 - Thanks for sending the piccies, you deliver EVERY time!  wink

Stargazer2006 - I intentionally wanted to sound like a kind of dominant, ill-mannered neanderthal. It was just a joke.  evileye

Please allow me to publicly apologize to you, Leela25, but I'm sure that you didn't take offense. Sorry.


 

Noprobzies regarding both. I know you jokers by heart these days. XD



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I came across this a week or so ago. A truly sad end to what would have been an awesome machine...

http://blogg.forsvarsmakten.se/blackhawk/wp-content/blogs.dir/32/files/2012/02/41.jpg



-- Edited by Flyboy on Saturday 8th of December 2012 04:22:16 PM

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That has to be one of the mockups.  I assure you both flying ships are preserved in storage at the US Army Aviation Museum.  I've sat in them both.

   Ray



-- Edited by rotorwash on Friday 4th of January 2013 05:39:08 AM

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I don't know, hopefully it is just one of the full-scale mock-ups. I believe the pic was taken at Ft. Eustis. Indeed you have sat in both the prototypes Ray, remember that piece you were going to write for my website?  wink

By the way, I have recently discovered some Army Aviation Digest PDFs from 1981 through 1992, with some very nice early info and images of the LHX and Comanche.  biggrin



-- Edited by Flyboy on Friday 4th of January 2013 01:43:48 PM

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Flyboy wrote:

I don't know, hopefully it is just one of the full-scale mock-ups. I believe the pic was taken at Ft. Eustis. Indeed you have sat in both the prototypes Ray, remember that piece you were going to write for my website?  wink

By the way, I have recently discovered some Army Aviation Digest PDFs from 1981 through 1992, with some very nice early info and images of the LHX and Comanche.  biggrin



-- Edited by Flyboy on Friday 4th of January 2013 01:43:48 PM


 Sorry, I haven't got that write up done yet, but I will try to get it to you soon.  Since the real Rah-66's are at Rucker, I could definitely see one of the prototypes being at Eustis.  

   Ray



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Let's not forget the OAH role it could've taken as well, much like the Longbow Apache. :)



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Yup. Second prototype tested with a smaller version of the Longbow fire-control radar complex in the rotor hub before it was decided that the RAH-66 would designate targets for the Longbow instead.



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There were options to use Comanches as designators for Longbows but radar-equipped alternatives were planned to make up at least 33% of the fleet. Early versions used a flat housing that looked like an orange cap on the hub, but being a downsized derivative of the Longbow's millimeter wave radar it performed significantly less than required so they upgraded to the larger cone shape dubbed the Comanche Radar. I think it was also developed by Northrop. I don't know if the larger size affected its cross-section or not but at least it performed better than before, which isnt saying much considering how many complaints there are about the Longbow version.



-- Edited by retroistic on Sunday 27th of December 2015 12:39:14 AM

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I like the internal weapon bays, it's too bad most modern helicopters don't have that feature.

Something I have always wondered, why does the fantail have a slant compared to other helicopters with straight fenestrons? Did this in some way decrease its signature or is there some other aerodynamic purpose I'm overlooking?

In all I think cancelling this machine was the right decision. It was too expensive to incorporate so much technology into one airframe that I think it was more cost effective to utilize multiple specialized platforms instead.



-- Edited by Pepper on Tuesday 29th of December 2015 02:32:58 PM

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Pepper wrote:

In all I think cancelling this machine was the right decision. It was too expensive to incorporate so much technology into one airframe that I think it was more cost effective to utilize multiple specialized platforms instead.


 Yup even when potential successors flopped too (Im looking at you ARH-70 )   :P



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retroistic wrote:

There were options to use Comanches as designators for Longbows but radar-equipped alternatives were planned to make up at least 33% of the fleet. Early versions used a flat housing that looked like an orange cap on the hub, but being a downsized derivative of the Longbow's millimeter wave radar it performed significantly less than required so they upgraded to the larger cone shape dubbed the Comanche Radar. I think it was also developed by Northrop. I don't know if the larger size affected its cross-section or not but at least it performed better than before, which isnt saying much considering how many complaints there are about the Longbow version.


 

Actually I have to correct you both on some key details. "Comanche Radar" was an umbrella term for what ever radar would be used under the radome, and the downsized Longbow derivative from Lockheed/Northrop was all they could get at the time. There was an ongoing program to use a lighter AESA radar and Boeing-Sikorsky approached 16 foreign and US suppliers but ten ended up pulling out, leaving them with the Longbow and a Raytheon radar, which among the rest had compatibility problems with the Hellfire. Other problems consisted of development costs, production schedule, and software development and compatibility. Work was being done to downsize the radar without sacrificing range before the program was cancelled, so no there was never another available option that complied with operating specifications like you stated.

 

Pepper wrote:

Something I have always wondered, why does the fantail have a slant compared to other helicopters with straight fenestrons? Did this in some way decrease its signature or is there some other aerodynamic purpose I'm overlooking?


 Canted tails are common on other designs too, though primarily found on larger helicopters with conventional rotor configurations. It increases CG range and hover performance depending on the design.



-- Edited by Gunship on Tuesday 29th of December 2015 06:03:34 PM

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Alan Dallas


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I don't even remember posting that comment thanks to the holiday leftovers I downed that night...sorry for the misinformation. I'll be more careful next time.no



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I always thought the canted tails on bigger helicopters was a sort of US mil spec regarding ground clearance? If you notice a few US helicopters have them, but rarely will you find it on anything European.



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the canted tail thrust adds to the lifting capacity and a c/g problem on a loaded cargo helicopter like the H 60 - CH 53 at a tail low attitude added T/R thrust countering torque of a loaded machine the component vector of c/g and thrust lift the tail = c\g stability and faster forward speed for any given t/q weight combination.

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Ah thanks for clearing that up Hillberg.



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Gunship wrote:
Actually I have to correct you both on some key details. "Comanche Radar" was an umbrella term for what ever radar would be used under the radome, and the downsized Longbow derivative from Lockheed/Northrop was all they could get at the time. There was an ongoing program to use a lighter AESA radar and Boeing-Sikorsky approached 16 foreign and US suppliers but ten ended up pulling out, leaving them with the Longbow and a Raytheon radar, which among the rest had compatibility problems with the Hellfire. Other problems consisted of development costs, production schedule, and software development and compatibility. Work was being done to downsize the radar without sacrificing range before the program was cancelled, so no there was never another available option that complied with operating specifications like you stated.

 Wow, that was educational. did some of my own research on that too and though the subject of the radar is a scattered one, it seems to piece together the way you put it. Good history lesson. :)



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Pepper wrote:

 If you notice a few US helicopters have them, but rarely will you find it on anything European.


 

Eh?

Airbus H160 has one, I think a few Eurocopters had them, early prototypes of the Russian Yak-24 had them...



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He said rarely, not never.

The Yak-24 prototypes had a 20 degree dihedral. Seriously, canted tail on tandem rotor pylons? That would be a neat trick.



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I misunderstood some documents on my PC while not being well versed on Yakovlev, which doesn't help matters. Sorry.



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