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Douglas D-741 / A4D-4 Skyhawk

overscan (PaulMM)

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The A4D-4 was a 1958 proposal for a long-range all-weather attack version of the Skyhawk. It would be capable of delivering a nuclear weapon at low altitude. The wing shape was changed from that of a delta to that of a swept tapered shape. The span of the swept wing was increased by about 10 feet over that of the earlier A4D versions, which requred that the outer wing panels be provided with folding. Seven hardpoints were to be installed underneath the wing and fuselage. A larger bubble-shaped canopy was to be fitted.

Text from http://home.att.net/~jbaugher4/newa4_26.html
 

fightingirish

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Scan from a magazine, found in another forum.

Skyhawk-1.jpg
 

Tailspin Turtle

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SteveO said:
Any idea what the trailing edge pods just outboard of the wing folds are on that A4D-4?

Could they be Kuchmann carrots(?) like those seen on the Convair CV990 and Handley Page Victor?

That's my guess. It was about the right time frame for the anti-shock concept developed independently by Whitcomb and Küchemann. See: http://en.wikipedia.org/wiki/Anti-shock_body
 

Tailspin Turtle

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Douglas proposed the J52-powered A4D-4 Skyhawk to the Navy circa 1958. It bore only a passing family resemblance to the A4D-2 or even the J52-powered A4D-3 that preceded it but was stillborn. I had thought that the proposal was not only unsolicited but not taken up by the Navy. It occurred to me tonight that the next Skyhawk upgrade was the A4D-5. It would have been very unusual for the Navy to skip a change number unless it had formally assigned to a contract and allocated Bureau Numbers like the A4D-3. Does anybody have a record of such an action involving the A4D-4?

For the A4D-4 SAC (which didn't necessarily make it an official Navy designation), see Ryan's excellent collection:

http://www.ibiblio.org/hyperwar/USN/SAC/A4D-4_SkyhawkSAC-581114.pdf
 

Tailspin Turtle

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AeroFranz said:
Kucheman carrots?

Küchemann carrots (after Dietrich Küchemann, a German aerodynamicist), or Whitcomb bodies (after Richard Whitcomb, a NASA aerodynamicist, he preferred "anti-shock bodies"). They apparently came up with the concept independently. They were intended to reduce the transonic drag and improve range by implementing the area rule postulated by Whitcomb
 

AeroFranz

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I meant, do you know if that's what those fairings are for, or were they there for some more obscure reason (fairing for an actuator/electronic equipment, say). I don't think I have seen wing carrots used for drag tailoring on any fighter.
 

Tailspin Turtle

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AeroFranz said:
I meant, do you know if that's what those fairings are for, or were they there for some more obscure reason (fairing for an actuator/electronic equipment, say). I don't think I have seen wing carrots used for drag tailoring on any fighter.

I'm all but certain that they were only there for transonic drag reduction. However, I don't have any official documentation that states that.
 

overscan (PaulMM)

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Additional details on the A4D-4 including 2 beautiful shots of a desk model and a description is on pages 116-117 of Tony Buttler's American Secret Projects: Bombers, Attack and Anti-Submarine Aircraft. Tony states the Küchemann carrots were for drag reduction, the extended wings increased fuel load but required a wing fold.

Images here are extracted from the SAC PDF above.
 

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overscan (PaulMM)

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Looks like its firing a Bendix Eagle (Douglas 742) AAM - Tony mention this but it seems a bit crazy.
 

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hesham

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Hi,

also from Tony Butler's book; American Secret Projects:
Fighters & Bombers;

Douglas D-745 was a weapon system based on carriage
of Eagle air-to-air missile, 13.5.58.
 

Pioneer

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overscan said:
Looks like its firing a Bendix Eagle (Douglas 742) AAM - Tony mention this but it seems a bit crazy.

Agree Overscan, although I think it is meant to represent a Maverick ASM?

Regards
Pioneer
 

Tailspin Turtle

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Maverick was a bit later. It is almost certainly a Douglas Model 742 missile, their airframe proposal for the Eagle air-to-air missile, which was won by Bendix/Grumman. A Corvus would have been a more logical choice for this artists concept and is included on the SAC list of weapons as well as the Model 742.
 

Jemiba

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Just as an attempt to find some reason in this that artist impression: Could there
have been ideas of using the bomber/fighter bomber complement of a carrier
as a kind of "flying arsenal ship" for interceptors like the Missileer ? The dedicated
interceptors, after having exhausted their own AAMs acting as pointers and the
other aircraft as shooters ?
 

Grey Havoc

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Jemiba said:
Just as an attempt to find some reason in this that artist impression: Could there
have been ideas of using the bomber/fighter bomber complement of a carrier
as a kind of "flying arsenal ship" for interceptors like the Missileer ? The dedicated
interceptors, after having exhausted their own AAMs acting as pointers and the
other aircraft as shooters ?

You might be on to something there.
 

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