Lockheed 1983 study based on highly mutato, JT-69 2D TVC engined YF-12

[flateric]

<...A study was conducted to determinehhe impact of integrated flight, inlet, and engine control system architectures on system
effectiveness (safety, mission reliability, maintainability, dispatchability, and availability) and life cycle cost (LCC). The aircraft
is a modified Lockheed YF-12 with a cruise Mach number of 2.5. It has advanced technology engines, mixed-compression inlets,
and vectoring/reversing nozzles.>

<The aircraft, which formed the basis of this study is a modified Lockheed YF-12 with cruise Mach number 2.5. The aircraft
uses advanced technology Pratt and Whitney Aircraft JT-69 afterburning, low-bypass turbofan engines. The inlets are axisymmetric, mixed-compression, variable geometry. The nozzles are two-dimensional, converging-diverging with thrust-vectoring and thrust reversing.>

From
Integrated Flight/Propulsion Control System Architectures for a High Speed Aircraft
L.H. Bangert and K.R. Henke
Lockheed-California Co., Burbank, CA
R.J. Grommes
Honeywell, Minneapolis, M N
W.B. Kerr
Pratt and Whitney Aircraft, West Palm Beach, FL
AlAA Aircraft Design, Systems and Technology Meeting
October 17-1 9, 19831Fort Worth, Texas

 

[elmayerle]

My main question would be the engine designation, it fits no P&W designation scheme that I'm aware of. Beyond that, though, it looks and sounds quite fascinating.

 

[flateric]

I've seen JT-69 designation several times...wasn't this just 'paper' or better say 'computer' engine?

"...The parametric engine computer deck employed
in this study represents the Pratt and Whitney
Aircraft (PWA) JT69 family of advanced technology
turbine engines. These engines are mixed-flow,
twin-spool, afterburning turbofans based on technologies
projected to be available in the 1986-1987 timeframe."

AIAA-82-1143
Propulsion System Requirements for Advanced Fighter Aircraft
J.H. Kamman and D.C. Perrymar
McDonnell Aircraft Co, St. Louis, MO

"...The P&WA JT69 parametric turbofan computer simulation deck was exercised
to assess the applicability of the fixed cycle STF686 engine for the MPSNA
design missions. This turbofan deck was developed during the Navy-funded ATES
program specifically for propulsion screening studies for military vehicles
sensitive to specific fuel consumption, such as MPSNA. The technology level is
consistent with an IOC of 2000 and a TAD of 1990. The JT69 computer programsimulates mixed-flow, fixed turbine geometry, two-spool turbofans. The lowpressure
spool is a single- or two-stage fan (a function of desired fan pressure
ratio) driven by a cooled turbine. The gas generator is a single-spool
compressor driven by a single- or two-stage cooled turbine.
These propulsion system data provide parametric trends.

NASA CR-179452
MULTIPLE PURPOSE SUBSONIC NAVAL AIRCRAFT (MPSNA)
MULTIPLE APPLICATION PROPFAN STUDY (MAPS)
by
N.F. Dannenhoffer, J.S. Herzberg, J.R. Kretzing,
J.R Landfleld, C.L. Mahoney, R.A. Mahoney, H.C. Potonides
GRUMMAN AEROSPACE CORPORATION
prepared for
NATIONAL AERONAUTICS AND SPACE ADMINISTRATION
NASA Lewis Research Center
Contract NAS3-24530

 

[elmayerle]

Yeah, sounds like a "paper engine", or at least a "software engine". I know that PWAC-Florida was playing with several while I was there. I wasn't involved and didn't have access, but they were definitely seeing what was feasible and worth developing for the next generation. I presume they still are and this is one such. Certainly, the "JT" is highly consistent with their number schemes.