Test 313: F-15 (1/12 Scale) Baseline & NASA Nonaxi. Plug

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Back Arrow.jpg Back to Additional Photos for 16-Foot Transonic Tunnel Ordered by Tunnel Test Log

Test 313 was conducted on a 1/12 scale model of the F-15 configuration during two test entries in 1976. This was a joint test with Pratt & Whitney and McDonnell Douglas to investigate the integrated performance benefits of nonaxisymmetric (2-D) nozzles with thrust vectoring and reversing capabilities. The model was originally built by Pratt & Whitney for propulsion integration studies in the 16-Foot Transonic Tunnel on the McDonnell Douglas F-15 fighter configuration but was never tested in any facility after the USAF decided that the performance of the F-15 was satisfactory without undergoing any additional studies. The model was borrowed from Pratt & Whitney for the current test to study integration issues of 2-D thrust vectoring nozzles on an actual aircraft configuration. This test was part of a nationally planned nonaxisymmetric nozzle development program in which NASA would study integration issues on the F-15 and F-18 aircraft, the USAF would conduct studies on the F-111 aircraft, and the USN would study issues of a specific nonaxisymmetric nozzle (called the Augmented Deflecting Exhaust Nozzle or ADEN) on the A-6 aircraft.

The 16’TT was the primary developer of 2-D nozzle and thrust vectoring technology in the free world. Although round nozzle thrust vectoring was tested in 1959 (Swallow model) and 2-D thrust vectoring nozzles were tested in 1969 (wing-jet interference deflected jet model), development of these technologies did not start in earnest until 1974 when Test 296 (a Twin 2-D Integrated Nozzle tested during 1974) was conducted. Between 1974 and 1994, over 75 16’TT entries (and a similar number in the 16’TT Jet Exit Facility) were made on NASA/DOD/Industry 2-D and/or thrust vectoring nozzles (either isolated or installed). In 1975, a Joint DOD/NASA/Industry Workshop, initiated by Branch management, was held at Langley and eventually produced a national NASA/DOD plan for the development of these technologies. An important part of this plan was the development of concepts for flight-testing thrust vectoring 2-D nozzles. Development of a three surface F-15 modified with canards and thrust vectoring 2-D nozzles was initiated by the 16’TT Branch with a contract to McDonnell Douglas in 1977. This configuration (designated the F-15 STOL and Maneuvering Technology Demonstrator) was eventually flight tested by the USAF in 1988. Other flight systems that were partially developed in the 16’TT and/or its associated Jet Exit Facility were the F-14 with yaw vanes, F-18 HARV, X-31, B-2, and F-35.


The first 14 photographs show display models built by Branch member Otis Pendergraph in 1974. The baseline and modified display models were built from plastic model airplane kits.

1974 Display model showing 2-D nozzle integrated with Langley Fighter/Attack Experimental (LFAX) configuration prior to F-15 work1974 Display model showing 2-D nozzle integrated with Langley Fighter/Attack Experimental (LFAX) configuration prior to F-15 work1974 Display model showing 2-D nozzle integrated with Langley Fighter/Attack Experimental (LFAX) configuration prior to F-15 work1975 1/72 Scale Axi and 2-D Wedge Nozzle F-15 Display Models1975 1/72 Scale Axi and 2-D Wedge Nozzle F-15 Display Models1975 1/72 Scale Axi and 2-D Wedge Nozzle F-15 Display Models1975 1/72 Scale Axi and 2-D Wedge Nozzle F-15 Display Models1975 1/72 Scale Axi and 2-D Wedge Nozzle F-15 Display Models1975 1/72 Scale Axi and 2-D Wedge Nozzle F-15 Display Models1975 1/72 Scale Axi and 2-D Wedge Nozzle F-15 Display Models1975 1/72 Scale Axi and 2-D Wedge Nozzle F-15 Display Models1975 1/72 Scale Axi and 2-D Wedge Nozzle F-15 Display Models1975 1/72 Scale Axi and 2-D Wedge Nozzle F-15 Display ModelsL-75-6047 Display Model


4/5/1976 to 6/21/1976 (Although the tunnel test log indicates the model entry was on 4/5/1976, the tunnel run log indicates that the first tunnel run was on 5/5/1976. This is a rather large time slot that is not accounted for. It could be attributed to model installation time but this is longer than most models took for installation.)

F-15 Baseline and Wedge Nozzle ConfigurationsF-15 Wedge Nozzle Operating Modes1976 1/12 scale F-15 propulsion model1976 1/12 scale F-15 propulsion model1976 1/12 scale F-15 propulsion model with Herm Stevens (Pratt & Whitney engineer)1976 1/12 scale F-15 propulsion model1976 1-12th F-15 Model with Dry Power 2D Wedge Nozzles with Vectoring or Reversing & NASA Afterbody1976 1-12th F-15 Propulsion Model Old Baseline with Dry Power Nozzles1976 1-12th F-15 Propulsion Model Old Baseline with Dry Power Nozzles1976 1-12th F-15 Propulsion Model Old Baseline with Dry Power Nozzles1976 1-12th F-15 Propulsion Model Old Baseline with Dry Power Nozzles1976 1-12th F-15 Propulsion Model Old Baseline with Dry Power NozzlesL-76-3362 F-15 Baseline1976 1-12th F-15 Propulsion Model Old Baseline with Dry Power Nozzles1976 1-12th F-15 Propulsion Model Old Baseline with Dry Power Nozzles1976 1-12th F-15 Propulsion Model Old Baseline with Dry Power Nozzles1976 1-12th F-15 Propulsion Model Old Baseline with Dry Power Nozzles1976 1-12th F-15 Propulsion Model Old Baseline with Dry Power Nozzles1976 1-12th F-15 Propulsion Model Old Baseline with Dry Power Nozzles1976 1-12th F-15 Propulsion Model Old Baseline with Dry Power Nozzles1976 Larry Leavitt and Odis Pendergraft with F-15/Nonaxisymmetric Nozzle Model1976 Larry Leavitt, Bobby Berrier and Odis Pendergraft with F-15/Nonaxisymmetric Nozzle ModelL-76-3946 F-15 2-D Wedge Nozzle1976 1-12th F-15 Propulsion Model with Dry Power 2D Wedge Nozzles & NASA Afterbody1976 1-12th F-15 Propulsion Model with Dry Power 2D Wedge Nozzles & NASA Afterbody1976 1-12th F-15 Propulsion Model with Dry Power 2D Wedge Nozzles & NASA Afterbody1976 1-12th F-15 Propulsion Model with Dry Power 2D Wedge Nozzles & NASA Afterbody1976 1-12th F-15 Model with Dry Power 2D Wedge Nozzles with Vectoring or Reversing & NASA AfterbodyL-76-4472 F-15 with Wedge nozzle thrust reverser1976 F-15/Nonaxisymmetric Nozzle Model1976 F-15/Nonaxisymmetric Nozzle Model (note thrust vectored nozzle)1976 F-15/Nonaxisymmetric Nozzle Model (note thrust reversed nozzle)1976 F-15/Nonaxisymmetric Nozzle Model (note thrust reversed nozzle)1976 F-15/Nonaxisymmetric Nozzle Model (note thrust reversed nozzle)


8/11/1976 to 8/31/1976 - Tests with McAIR (McDonnell Douglas) afterbody

1977 1/12 Scale F-15 Propulsion Model MCAIR Afterbody1977 1/12 Scale F-15 Propulsion Model MCAIR Afterbody1977 1/12 Scale F-15 Propulsion Model MCAIR Afterbody1977 1/12 Scale F-15 Propulsion Model MCAIR Afterbody1977 1/12 Scale F-15 Propulsion Model MCAIR Afterbody1976 1-12th F-15 Propulsion Model with Dry Power 2D Wedge Nozzles & McAir Afterbody1976 1-12th F-15 Propulsion Model with Dry Power 2D Wedge Nozzles & McAir Afterbody1976 1-12th F-15 Propulsion Model with Dry Power 2D Wedge Nozzles & McAir Afterbody1976 1-12th F-15 Propulsion Model with Dry Power 2D Wedge Nozzles & McAir Afterbody1976 1-12th F-15 Propulsion Model with Dry Power 2D Wedge Nozzles & McAir Afterbody1976-08-27 Bobby Berrier working on F-15/Nonaxisymmetric Nozzle Model (Graveyard shift)
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