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Northrop (Y)A-9 AX contender

Stargazer2006

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Sorry for the above post. I hadn't noticed that the connection between the Sierra Sue and the A-9 had already been discussed in this very thread... Here's an item found online that adds to the subject:

Designed and flown by Ron Beattie and Walt Fellers, two North American Engineers who came to work for the Northrop Division. The aircraft was built by the Acme Aircraft Company (Sierradyne Inc.) Crawford and Keeney, at the Torrance Airport in late 1948. The first flight was on 23 November 1953. It was built according to Goodyear Racing Plane specifications. Although it was never entered in any races, extensive data was obtained during its many flights.

This experimental aircraft was built to investigate the advantages of a pusher propeller configuration. It has a "Y" shaped tail incorporating ruddervators on the upper fins, an unswept wing mounted midway up the fuselage, an engine mounted directly behind the cockpit, and large air scoops mounted in the forward end of both wing roots. The aircraft was used by Sierradyne in the 1960's to test and promote Northrop's and Dr Werner Pfenninger's boundary layer control concepts. Northrop used it as a flying technology demonstrator for the Air Force’s AX close-support aircraft design competition in 1972. The plane was never officially considered a Northrop aircraft.
(Bold type is mine; please note that some photos have the S-1 carrying the name "Northrop Turbo-Pusher...)

Source: Western Museum of Flight
 

overscan (PaulMM)

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Walt Fellers was the primary designer of the Northrop pusher AX designs, which were clearly inspired by his much earlier Sierra Sue design.
 

Nico

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Yes, I apologise:
I found the designations of Northrop A-X proposals (N-308 for the turboprop pusher and N-312 and N-320 for the twin turbofan YA-9A and FH-129 and/or FRC-160 for the A-10) on the proper thread.
Now are still pending questions about and. Tizio and Williamson...
Nico
 

Mark Nankivil

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circle-5

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Side by side comparison of two Northrop factory shop models reveals the many refinements that appeared between the original A-X proposal (left, ca. November 1970) and the final A-9A configuration:

- From mid-wing to high-wing
- From flat horizontal stabilizer to pronounced dihedral
- Increase in wing chord and area
- Different air intakes, splitter plates, wingtip contours, flap tracks, engine exhausts and more...
 

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overscan (PaulMM)

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Beautiful pics of two great models. Thanks for sharing.


It's crude but this 3 view looks like the earlier mid wing model:


 

Triton

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Northrop A-9 contractor model found on eBay.

[link no longer active]

Genuine?
 

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Pioneer

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Does anyone have any links to footage of the Northrop YA-9 flying, firing cannon or dropping weapons, during the YA-10 & YA-9 flyoff / eveluation???
There has to be something out there that shows this design in flight, so as to compare too that of the YA-10 footage :-\
I've had no luck with Youtube :mad:

Regards
Pioneer
 

The Artist

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Pioneer said:
Does anyone have any links to footage of the Northrop YA-9 flying, firing cannon or dropping weapons, during the YA-10 & YA-9 flyoff / eveluation???
There has to be something out there that shows this design in flight, so as to compare too that of the YA-10 footage :-\
I've had no luck with Youtube :mad:

Regards
Pioneer
Just a thought. See if any of the Air Force Now segments from that period have been digitized and placed on the web. We saw a lot of the Air Force Now installments on 16mm in an explorer post back in the 70s and I think there was some of what you're looking for in that series.
 

Mark Nankivil

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overscan (PaulMM)

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Ron Downey has posted a copy of the Northrop A-9 Flight Manual over at

 
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hesham

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PaulMM (Overscan) said:
Ron Downey has posted a copy of the Northrop A-9 Flight Manual over at http://aviationarchives.blogspot.com/2017/06/northrop-9a-flight-manual.html
Nice find my dear Paul.
 

Gruber

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Hi there first post in here but I have been lurking for a couple of years. Going back to the Northrop A-9 I have not seen any pictures of the gun cradle that is mentioned in some publications. Does anybody have any pictures of the actual gun installation?

Thanks in advance
 

hesham

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Gruber said:
Hi there first post in here but I have been lurking for a couple of years. Going back to the Northrop A-9 I have not seen any pictures of the gun cradle that is mentioned in some publications. Does anybody have any pictures of the actual gun installation?

Thanks in advance
I will search Gruber.
 

Foo Fighter

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The advertising types had a field day with the dictionary didn't they. Never get away with that nonsense now. Thankfully.
 

kaiserd

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“Unbelievable invulnerability”
A literally true statement :)
 

Hood

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Better than CGI any day, all it needed was Jimmy Stewart or Henry Fonda in the cockpit to finish off the effect.
 

overscan (PaulMM)

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Ron Downey has posted A-9 Technical Proposal and Source Selection documents on his blog.


 
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riggerrob

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Shifting from mid-wing to high-wing allowed them to shorten undercarriage and simplify wing spars
It also gave ground crew more room to work when hanging bombs or changing engines.
 
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