Vought (LTV) V-530 and V-534 (US Navy "Type A" proposals)

[overscan (PaulMM)]

Vought V-530

 

[overscan (PaulMM)]

Vought V-530 3 view

Source:
Billy Brassell, Jr, V/STOL Aircraft Design Sensitivity to Flying Qualities Criteria Study, Vought

 

[overscan (PaulMM)]

4.1.7 Vought

For the past several years, Vought has studied a medium-speed concept (V-530) that features a tandem-fan propulsion system (Refs. 25 and 26). Figure 45 is an artist's rendering of an early V-530 configuration which emerged from studies in support of the Navy's "Type A" subsonic multimission V/STOL notional requirements.

The aircraft is a high wing monoplane with moderate-aspect-ratio wing and winglets, and with two shoulder mounted engine nacelles. The V/STOL propulsion system is essentially self-contained in the two nacelles. Each nacelle contains a core engine, two fixed-pitch fans with variable-inlet guide vanes, and associated inlets and nozzles.

Figure 46 illustrates the tandem-fan propulsion concept. Two fans on a common shaft are located ahead of, and are directly driven by, a turboshaft engine. Small fan diameters resulting from the use of two fans in each nacelle permit direct drive by the core engine with no reduction gear between engine and fans. Also, the tandem placement of these relatively small fans results in a smaller nacelle diameter and therefore reduced drag. Each fan has its own inlet and nozzle, and flow through the two fans is maintained separately at all times. The forward inlet supplies air to the front fan, which has a nozzle that can be vectored from a vertical position for hover, to an intermediate position for transition, and to an aft position for cruise (Fig. 46). The upper inlet feeds both the aft fan and the core engine (which is supercharged by the aft fan). The core and aft fan flows are mixed and discharged through the aft nozzle. This nozzle is also vectorable for VTOL and up-and-away flight.

Figure 47 illustrates the propulsion system arrangement in the two nacelles and the cross shafting between the two nacelles. Acommon fan size is used in all four fan applications. Power is transferred from the gas turbine in one nacelle through the cross shaft to the fans in the opposite nacelle to maintain thrust symmetry during single-engine operation or to prOVide asymmetric thrust for lateral control during hover. Variable inlet guide vanes on each fan provide thrust modulation for pitch and roll control (Fig. 48). Differential deflection of the left and right nacelle nozzles provides yaw control.The forward two-dimensional nozzle uses a two-piece deflector for vectoring thrust (Fig. 46). Variation of nozzle area in cruise is achieved with a small flap mounted on the nacelle surface. The aft two-dimensional nozzle vectors mixed flow from the core engine and aft fan. The nozzle deflector is hinged along the lower portion of the nacelle and rotates downward for vertical flight. A rotating lower flap is used to achieve thenozzle areas required for cruise.

Vought has conducted a number of tests of the tandem-fan configuration and propulsion system components over the past several years. These have included a series of inlet tests with NASA Lewis Research Center, front and rear nozzle tests, powered model tests to evaluate ground effects, and low-speed wind-tunnel tests. References 25-33 describe some of these activities.

http://ntrs.nasa.gov/archive/nasa/casi.ntrs.nasa.gov/19840014464_1984014464.pdf

 

[Jemiba]

The V-530 from Aviation Week 10/1977 :

 

[Orionblamblam]

Some fruits of my archival dig:

 

[overscan (PaulMM)]

Scott posted these on his blog (http://up-ship.com/blog/?p=207)

V-530 stuff...

 

[Mark Nankivil]

Found these photos of the V-530 model when at the Vought Archives.

Enjoy the Day! Mark

 

[overscan (PaulMM)]

Cute little squat thing, isn't it

 

[hesham]

Hi,

the folding of Vought V.530.

 

[Mark Nankivil]

Greetings All -

A few more drawings from the Vought Archives covering the V-530 and its baseline comparison, the CTOL V-534. Of particular interest (well, to me anyway) is the Design Selection Chart. There's some designs there I would like to find out more about. Note too there are two V-530 designs, the twin fan and the single fan.

Enjoy the Day! Mark

 

[TinWing]

Greetings All -

A few more drawings from the Vought Archives covering the V-530 and its baseline comparison, the CTOL V-534.

The V-534 is an incredible find. Do you have any further information as to the timescale of this design, or the choice of turbofan? More to the point, was there any relationship between this study and the "micro" S-3 Viking mentioned in the below thread?

http://www.secretprojects.co.uk/forum/index.php/topic,4551.0/highlight,viking.html

 

[Stargazer]

The V-534, described in one listing as a "Type A multi-mission STOL attack aircraft project" was conceived in 1978. The pre-Viking project came before the actual S-3 design was frozen, so I'd say late 1960s or early 1970s.

 

[AeroFranz]

Good stuff. I especially liked the large-scale drawing of the tandem fan. Thanks!

 

[GTX]

Hi folks,

Over on Whatifmodelers, there was mention of a proposal to test podded pegasus on the Lockheed S-3 Viking to possibly create a VSTOL verion. Does anyone know anything of this?

Regards,

Greg

 

[Mark Nankivil]

Greetings All -

A couple of photos of the V-530 models in the Vought Archives along with a Swing Out Fan design that is shown in the top left corner of the V-530 design selection chart. You can see the line for the fans curving around the star and bars on the side of the fuselage. Also included is a photo of a model noted as a V-538 which appears to be an evolved variant of the V-530.

My friend Fred Harl joined me on the last trip to Vought in November and took photos of some of the models while I was looking at papers and photos in the drawers. Thanks Fred!

Enjoy the Day! Mark

 

[Stargazer]

Wow, very nice. One of my favorite unbuilt aircraft ever!

I think you are mistaken in seeing the last picture as a "V-538" because if you look carefully, it's exactly the same V-530 model that is in the top picture!

The V-538 was a two-seat trainer project for the NGT program that used a VFW/RFB Fantrainer type configuration. Also note that the second picture you've described as V-530 actually depicts a different type submitted for the S-3 competition.

Programs related to V-530 in that timespan were V-534 (Type A multi-mission STOL attack aircraft project) and V-537 (Type A V/STOL aircraft project with retractable rotor).

 

[Mark Nankivil]

You're right Stargazer - that's what I get for staying up late and trying to read without reading glasses

Thanks for passing that along Overscan!

Enjoy the Day! Mark

 

[Mark Nankivil]

Greetings All -

Another find in the Vought Archives is this configuration study of a S-3 variant to meet the Type A V/STOL requirements. I have one other drawing I'll post later but it needs some serious clean up before then.

I have removed from a previous post a photo I mis-ID'd as a V-530 variant and is instead part of this design study. Would help if I read the display base :

Enjoy the Day! Mark

 

[Pioneer]

Sorry Mark I do not know or how I missed your great Vought drawing find, back in December!

They are great and again after looking at these, I really have to ask myself once again, how Vought never snagged the VSX contract (as opposed to sub contracting to Lockheed!), what with all the work they put into the type and role!

I especially like the 'AAW' variants of both the V-530 and V-534's proposals. The FAD (Fleet Air Defence / Missileer) idea/concept must have still be strong in the Vought campus!!


Again great work and good hunting

Regards
Pioneer

 

[Bill S]

Here are a few V-530 slides to add to the discussion and your information.


Vought Archives


bill

 

[Bill S]

A couple of V-530 Wind Tunnel Model photos with more of a high "T" tail configuration.
Interesting as you can see down the inlet on the second photo and see the engine front face.
Vought Archives.


bill

 

[Mark Nankivil]

Greetings All -

A few drawings from a report in the Vought Archives outlining the conceptual development of the V-530 series Type "A" V/STOL design.

I have some artwork for a few of these concepts I'll post shortly.

Enjoy the Day! Mark

 

[Mark Nankivil]

...and a few more...

 

[AeroFranz]

Fan-(expletive of choice)-Tastic. The alternate configurations pictures are particularly noteworthy.
You're spoiling us Mark

 

[Stargazer]

Mark, this has to be the single most interesting day I've had on the forum for quite a while. Thank you so much for spoiling us like you do!

 

[Mark Nankivil]

Thanks guys - here's some artwork to go with the drawings...

Enjoy the Day! Mark

 

[Stargazer]

Wish there was a smiley for drooling madly... ;D

 

[VTOLicious]

Thanks guys - here's some artwork to go with the drawings...
Enjoy the Day! Mark

Outstanding Artwork! Thank you very much for posting...can´t get the grin out of my face ;D

...it´s a real pity that none of those concepts became reality.

Rgds Michael

 

[Pioneer]

Greetings All -

Another find in the Vought Archives is this configuration study of a S-3 variant to meet the Type A V/STOL requirements..................

Enjoy the Day! Mark

This makes sense! After all one must remember that Vought had a very big part and influence in making the 'Lockheed' S-3A Viking design what it is!!

Regards
Pioneer

 

[VTOLicious]

...and a few more...

Hi Mark! Do you have a better quality/ higher resolution scan of this drawing and/or some more information about this vectored-nozzle-concept?

Regards Michael

 

[Mark Nankivil]

Hi Michael -

I have a higher rez copy of the same drawing but it is as muddy as this one is. The engine set up is similar to a number of the ADAM concepts, you could look thru those threads and see if info there helps.

Enjoy the Day! Mark

 

[VTOLicious]

Hi Michael -

I have a higher rez copy of the same drawing but it is as muddy as this one is. The engine set up is similar to a number of the ADAM concepts, you could look thru those threads and see if info there helps.

Enjoy the Day! Mark

Thx for the quick reply!...I think there is no relation to ADAM. Both vectored nozzle concepts have a mechanical drive system. See pic attached.

 

[Bill S]

Here are a few more images of one of the V-530 configurations. This one does not have the "T" tail and the wings pivot forward rather than folding as some versions of the V-530 do. VAHF images, scans by me.


bill


http://voughtworks.blogspot.com/

 

[Bill S]

Last three. The model helps give a little better detail to the shape of the aircraft.

 

[Stargazer]

Superb pics of one of my pet unbuilt projects. Thanks for sharing!

 

[Bill S]

Here are some more drawings unearthed concerning the Type A V/STOL proposals by Vought.
VAHF Archive material.

 

[Mark Nankivil]

Nice photos and drawings Bill - thanks! Mark

 

[csurdak]

I’ve always loved this design. Imagine what you could do with GE90 engines! A VTOL C-130, or maybe even an A400-equivalent.

 

[apparition13]

This is my favorite of the Type A designs. I would have liked to have seen that program continue with both the V-530 as a high risk option and the CL-84-8 as the low risk option. If the tandem fan proves viable you have a high performance VSTOL CSA and if it doesn't you have the CL-84 as a somewhat lower performance but still viable CSA for operation from amphibious assault ships and STOVL carriers. Although I think both might be useful if both work.

The same would have been true for the Convair 200 and XFV-12. The XFV-12 didn't work out, but the Convair 200 probably would have. Even a small production run would add to experience with VSTOL fighters which should both improve the next generation and provide momentum to develop a next generation.

 

[Dew]

From GRC via NARA (straightened & cropped):

National Archives NextGen Catalog

The online portal to the records held at the National Archives, and information about those records.

catalog.archives.gov