LTV V-524, Cross Flow Fan (MBPR) V/STOL Fighter/Attack Concepts (FAVX)

Mark Nankivil

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Good Day All -

In the Vought Archives I came across a folder with the title "V/STOL Fighter/Attack Concepts (FAVX)" with copies of overhead vuegraphs from a November 1975 presentation. The effort was a direct result of the U.S. Navy's effort in that time frame for a significant V/STOL capability thru such programs as V/STOL A and V/STOL B though I am not too sure just what specifically this effort was tied to. The only design that was familiar to me is the V-521 which seems to be a base design for this effort. Also shown in this presentation was the Superfly concept which is in other threads in Postwar Aircraft Projects.

Have not figured out yet what MBPR stands for - Bill, have you seen that referenced elsewhere in the archives?

The images in the presentation are shown in the order presented.

Enjoy the Day! Mark
 

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Mark Nankivil

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...and the rest of the images...

Enjoy the Day! Mark
 

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Sundog

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Thanks for all of the images. However, I feel a bit let down. I'm currently working on a GA/Homebuilt design that I hadn't seen before that uses a ring wing. It isn't a VTOL, but it looks a hell of alot like the RWA configuration. Maybe I'm not as crazy as I thought I was. ;D

I love that first MBPR 524 configuration.
 

Pioneer

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Once again you have outdone yourself Mark!
Another project that I was the no wiser too!

Thanks once again for your time and diligence in delivering suck projects

Regards
Pioneer
 

overscan (PaulMM)

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MBPR (Multi ByPass Ratio) was an early application of Cross-Flow Fans for VTOL/STOL.

Back in 1975, Vought Systems Division (VSD) (a division of the LTV Aerospace Corporation) was awarded a 12 month contract “Multi-Bypass Ratio Propulsion System Technology Development” by the Naval Air Systems Command [Ref. 3]. The main objectives were to verify the performance capabilities of the Multi-Bypass Ratio (MBPR) Propulsion System through additional tests of the CFF and to conduct studies of the fan structure and fan system. VSD designed, constructed and tested a CFF measuring 12 inches in diameter and both 1.5 inches and 12 inches in span between 6,000 and 13,000 RPM in order to establish baseline performance. Several configurations of a typical setup as shown in Fig.2 [Ref. 3], which included varying the shape of the low and high cavities, different blade designs and the different area of the exhaust outlet, were used to measure the performance of the CFF. The cavities were used to influence the recirculation flow vortices while the ratio of the fan inner to outer radius also greatly affected the performance. Even though extensive tests had been conducted for several configurations, the optimal design parameters were too complex to be determined. In this project, the experimental setup of the CFF was modeled after one of the most optimal configurations determined by VSD.

From http://edocs.nps.edu/npspubs/scholarly/theses/2003/Dec/03Dec_Cheng.pdf

Reference 3 is

Naval Air Systems Command Contract N00019-74-C-0434, Multi-Bypass Ratio Propulsion System Technology Development, Vol. I-III, Vought Systems Division, LTV Aerospace Corporation, 24 July 1975.
 

AeroFranz

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Paul, correct me if I'm wrong, but the MBPR configuration would have had two shaft driven CFFs in the nose and two additional units pivoting out on the wingtips? That's quite novel. Thanks for posting the link.
 

fightingirish

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Mark Nankivil

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Nice model - thanks for posting it!

Enjoy the Day! Mark
 

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