CHINESE COMMUNIST AERODYNAMIC RESEARCH AND DEVELOPMENT FACILITIES

• Document Type: CREST
• Collection: NGA Records (Formerly NIMA)
• Document Number (FOIA) /ESDN (CREST): CIA-RDP78T05162A000100010071-2
• Release Decision: RIPPUB
• Original Classification: T
• Document Page Count: 26
• Document Creation Date: December 28, 2016
• Document Release Date: August 2, 2011
• Sequence Number: 71
• Publication Date: March 1, 1970
• Content Type: REPORT

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PHOTOGRAPHIC INTERPRETATION REPORT
CHINESE COMMUNIST
AERODYNAMIC RESEARCH AN D
DEVELOPMENT FACILITIES
TCS-20097/70
MARCH 1970
COPY ~,18
32 PAGES
PIR-014/70
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CHINESE COMMUNIST AERODYNAMIC RESEARCH
AND DEVELOPMENT FACILITIES
LIST OF ILLUSTRATIONS
Figure 1. Location Map of Peking .......................................... .
Figure 2. Research and Development Area at Peking Guided
Missile Development and Production Center ........................ .
Figure 3. Layout of Research and Development Area at Peking
Guided Missile Development and Production Center ................. .
Figure 4. Plan Views of Test Building 1 and Adjacent Facilities ................. .
Figure 5. Plan Views of Test Building 2 and Wind Tunnel ...................... .
Figure 6. Plan Views of Compressor Building and Adjacent Structures.......... .
Figure 7. Research and Development Area at Peking Aviation Institute .......... .
Figure 8. Layout of Research and Development Area at Peking Aviation Institute . .
Figure 9. Plan Views of Test Building and Compressed Air Storage Facility ...... .
Figure 10. Area I, Peking Institute of Mechanics .............................. .
Figure 11. Layout of Area I, Peking Institute of Mechanics ...................... .
? Figure 12. Plan Views of Probable Test Buildings and Adjacent Facilities ......... .
Figure 13. Area II, Peking Institute of Mechanics .............................. .
Figure 14. Layout of Area II, Peking Institute of Mechanics ..................... .
? Figure 15. Plan View of Wind Tunnel ........................................ .
Figure 16. Location Map of Shenyang ........................................ .
Figure 17. Research and Development Area at Shenyang Airframe Plant 112...... .
Figure 18. Plan Views of Wind Tunnel and Associated Facilities ................. .
Figure 19. Location Map of Nanching ........................................ .
Figure 20. Research and Development Area at Nanching Aeronautical Institute ... .
Figure 21. Location Map of Hsian ......................................... .
Figure 22. Hsian Aviation Institute, Northwest Industrial University ............. .
Figure 23. Layout of Hsian Aviation Institute ................................. .
Figure 24. Plan Views of Test Building and Associated Facilities ................. .
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ABSTRACT
Six installations with facilities for conducting aerodynamic research and development
have been identified in Communist China from KEYHOLE photography. The number and
type of test facilities contained in these six installations vary considerably, ranging from
the large and sophisticated research and development area at the Peking Guided Missile
Development and Production Center Changhsintien to the small research and development
area (Hsian Aviation Institute) at the Northwest Industrial University, Hsian. The other
four installations are at Peking Aviation Institute, Peking Institute of Mechanics,
Shenyang Airframe Plant 112, and Nanching Aeronautical Institute.
The six installations are analyzed separately in this report, and each analysis includes a
data block, text, line and detailed drawings, photographs, and detailed mensuration*
where possible.
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Pei-thing Guided Missile Development and Production Center Chang-lisin-tien
39-48-45N 116-07-54E
c ACIC. USATC, Series 200, Sheet 0381-01, scale 1:200,000
GMAIC 01-70
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INTRODUCTION
CH
The research and development area at the Peking Guided Missile Development and
Production Center Changhsintien, China is situated immediately southwest of the test
stand area. The center itself is located approximately 13 nautical miles (nm) southwest of
Peking (Figure 1).
This is the largest and most diversified area for conducting aerodynamic and associated
research known to exist in Communist China (Figures 2 and 3). It contains a subsonic,
closed circuit continuous-flow wind tunnel, two large test buildings (designated in this
report as test buildings 1 and 2), a small test building, a probable high-pressure test
station, a large compressor building, a compressed air storage facility, a probable model
shop, a fuel storage facility, and a number of small utility and support structures. * A
probable masonry wall surrounds the entire area.
o Transportation services include a rail spur and a network of good all-weather roads.
Photography of June 1959 provided no indication of planned construction in this area;
however, all of the major facilities except the closed circuit wind tunnel were in mid- or late-
" stages of construction when they were initially observed on photography of September 1961.
By August 1962, all structures appeared to be externally complete. The closed circuit wind
tunnel was constructed between September 1964 and August 1965.
PEKING GUIDED
MISSILE DEVELOPMEN
CENTER
39?45'-
Liang-hs~ian~g
~ //
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T~ Railroad, double track
-~-~- Railroad, single track
Road
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MAJOR FACILITIES
Test Building 1
Test facilities housed in test building 1 (Figure 4) have been added during a period of
over four years, from August 1962 to December 1966. Test building 1 presently contains two
large probable intermittent blowdown wind tunnels, a small probable intermittent
blowdown wind tunnel, a possible altitude test cell for small or low-thrust propulsion
systems, and afive-story administration and data reduction section.
One of the large probable intermittent blowdown wind tunnels utilizes a diffuser with a
vertical silencer and exhaust stack. This tunnel was present and probably operational as
early as August 1962, when the test building was observed to be externally complete. The
next addition to test building 1 vas the diffuser for the possible altitude test cell, which was
added between August and December 1962. The diffuser has a configuration like that of a
huge tuning fork. Both diffuser sections (prongs) are slightly tapered and each has asingle-
stage ejector. The diffuser is also equipped with a cooling system consisting of a small
valve/pumphouse and a series of six water pipelines mounted over and spanning the width
of both diffuser sections. The diffuser for the small probable intermittent blowdown wind
tunnel was first seen on photography of March 1964. The poor interpretability of
photography prior to that date precluded an earlier identification. The diffuser is slightly
tapered and probably also has asingle-stage ejector. The other large probable intermittent
blowdown wind tunnel was the last addition to test building 1. It was assembled between
August 1965 and December 1966. The tunnel employs a large tapered diffuser that is
equipped with a probable two-stage ejection system.
Test Building 2
The exact number or type of test facilities contained within this test building (Figure 5)
is unknown. It appeared to be externally complete by August 1962. Four large horizontal
pressure bottles, each approximately 60 feet (18.3 meters) long and 10 feet (3.0 meters) in
diameter, are located on the northeast side of the building. The building may also be
supplied with air from the large compressor building located directly across the street
(Figure 3). There are two vertical stacks on the southwest side of the building which maybe
exhaust ducts or air dryers. Two large transformers adjacent to the northwest corner of the
building supply it with electric power.
Small Test Building
The small test building (Figure 4) is located immediately north of test building 1. It
contains a small probable intermittent blowdown wind tunnel and a small two-story
administration and data reduction section. The small probable blowdown tunnel uses a
small, slightly tapered diffuser, first seen on photography of March 1964. The poor
interpretability of earlier photography prevented its identification prior to that date. It
appears that the diffuser will have an ejector; however, supply lines to the ejector are not
evident. The small test building is also tied into the header system from the nearby
compressed air storage facility.
Probable High-Pressure Test Station
The facility (Figure 4) is identified as a probable high-pressure test station primarily
because of its close resemblance to the high-pressure test station located at Arnold
Engineering Development Center (AEDC), Tullohoma, Tennessee. The test station is
located near the small test building at the end of the header which supplies compressed air
to the test buildings (Figure 4). The station consists of a control and instrumentation
building, a blast pad, and a shed, which covers the test unit. The test unit at AEDC is not
under roof. A stilling chamber is not visible at this Chinese facility; however, since the
header to which it would be connected is located underground, the chamber would
probably also be underground. Construction of this facility was very slow ; it was first seen
under construction in September 1965 and did not appear to be complete until October
1969.
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Closed Circuit Continuous-Flow Wind Tunnel
This is a typical subsonic, closed circuit continuous-flow wind tunnel (Figure 5).
Although the tunnel was externally complete by August 1965, it probably did not attain
operational status until late 1965 or early 1966. The tunnel is equipped with an air
breather/air inlet section, an air exchange section, and a large drive-motor and fan section,
indicating that it probably operates at least in the high subsonic range above mach 0.5 (380
mph). The size of the tunnel test section is unknown and has not been postulated in this
report. The entrance cone has a width of 20 feet (6.1 meters) where it enters the section
containing the test and data reduction operations. The exit cone is approximately 20 feet
(6.1 meters) wide at its point of emergence. The wind tunnel is also provided with a small
administration section, a model buildup section, and a small utility section.
Cooling Water
Cooling water for use by all the test buildings is supplied from a facility located on the
southwest side of the area, near test building 1 (Figure 3). The facility contains two large
underground tanks, each approximately 40 feet (12.2 meters) in diameter; a large natural-
draft cooling rack ; and a pumphouse. Water supply is probably from a deep well located in
the same general area.
Compressed o4ir Storage Facility
Compressed air to drive the test facilities housed by the test buildings is stored in an
adjacent compressed air storage facility consisting of 49 horizontal pressure bottles aligned
in two rows (Figure 6)
. The entire faci ity as a
storage capacity of approximately 447,615 cubic feet (12,675.0 cubic meters). An
underground header system provides air flow from the pressure bottles to the test buildings.
Prior to November 1968 both ends of each pressure bottle fed into the header; however,
probably due to some pressure or air flow problems, the pipes connecting the outside ends of
the pressure bottles to the header were apparently removed between September 1968 and
November 1968.
Compressor Building
The compressed air storage facility is connected to a large compressor building (Figure
6) by the same header system which connects it to the test buildings. Six probable vertical
air dryers are located along the northeast side of the compressor building. An adjacent five-
unit induced-draft cooling tower with a nearby large underground water tank,
approximately 70 feet (21.3 meters) in diameter, and a pumphouse provide cooling for air
compressors and other components. The relatively large size of the compressor building
probably indicates that additional space was incorporated for repair and maintenance of
compressors and other equipment from facilities within the research and development area.
This space could also contain some test facilities.
Fuel Storage Facility
This type of fuel storage facility (Figure 3) is common to a large variety of installations
in both the Soviet Union and Communist China, including aircraft engine plants, airfields,
and some airframe plants. The facility consists of a combination pump and valve house
facing a semicircular arrangement of 14 underground horizontal fuel tanks. It is rail served
and has a fuel offloading terminal which can accommodate four tank cars simultaneously.
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Pei-thing Aviation Institute
NA
39-59-20N 116-21-OOE
ACIC. USATC, Series 200, Sheet 0381-01, scale 1:200,000
NA
GMAIC O1-70
250523
INTRODUCTION
CH
Peking Aviation Institute is located approximately 4 nm northwest of the old walled
city, within the university district of Peking (Figure 1). It is the largest and most important
aviation institute in Communist China. A large associated research and development area
joins the southern boundry of the institute.
The limited interpretability of existing photographic coverage of the aviation institute
has prevented an in-depth analysis of the number or types of test facilities contained by its
associated research and development area, and the physical limits of the area have also
been difficult to establish. This area (Figures 7 and 8) contains 12 major structures plus a
large number of small support structures, making it the second largest research and
development area of this type in China. Included among the major facilities are a test
building, two possible test buildings, a probable compressor building, a large compressed
air storage facility, a circular probable test area, a large assembly/shop building, and a
steamplant.* The following analysis includes both functional and chronological data on all
significant facilities.
MAJOR FACILITIES
Test Facilities
A large test building is located on the west side of the research and development area,
and two possible test buildings are situated near the center of the area. All of the test
buildings were complete when they were first seen on photography of June 1959.
The large test building (Figure 9) on the west side of the area probably contains a large
intermittent blowdown wind tunnel. The tunnel utilizes a large, slightly tapered diffuser
which has asingle-stage ejector. The diffuser was added to the test building between
September 1964 and September 1965. This test building probably houses additional test
facilities; however, they cannot be identified on existing photography.
The number or types of test facilities contained by the two possible test buildings
cannot be determined. The larger of the two possible test buildings does not appear to have
any diffusers, ducting, exhaust ports, or air intakes normally associated with a wind tunnel
or test building. The only indication of what types of test facilities are housed by the other
possible test building is a large pipe/duct, approximately 6 feet (1.8 meters) in diameter.
The pipe/duct passes through and between the test building and small adjacent annex,
forming afigure-eight arrangement (Figure 8). The precise function of this large pipe/duct
cannot be determined at this time. A probable underground fuel tank nearby may be
connected to the test building. It could be a part of a cooling system for a test facility, such
as a test cell.
A large circular probable test area, approximately 135 feet (41.1 meters) in diameter, is
located on the east side of the research and development area. The area has a natural
surface and is probably used for test flying model aircraft.
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Compressed Air Storage Facility
Compressed air to drive the test facilities housed by the test buildings is stored in a
large compressed air storage facility (Figure 9) on the west side of the research and
development area. It consists of both horizontal pressure bottles and vertical pressure
bottles. There are at least 18 horizontal pressure bottles aligned in two rows of nine bottles
each. These horizontal bottles could be double stacked, which would double their number.
The double stacking of horizontal pressure bottles is a common practice in the Soviet Union
and has also been observed in China. There are 36 vertical pressure bottles aligned in three
double rows containing 12 bottles each. The reason these pressure bottles are in a vertical
position as opposed to a horizontal position is probably to conserve space. The horizontal
bottles provide approximately 72,360 cubic feet (2,049.0 cubic meters) of storage space;
each bottle measures approximately 40 feet (12.2 meters) long
. Air flow from the compressed air storage facility to
the test buildings is probably through an underground header system. The exact dates of
construction for the compressed air storage facility are not known; it was, however,
accomplished some time between June 1959 and September 1963.
Road
--~- Fence
~--~ Pipe/duct
---- Underground pipe
~-~ Ucon
`o ~ Stack
100 O FEET 300
O METERS 90
0
TANK
POSS ~n
TEST LLiJ
BLDGS
`-' PROS
COMPRESSOR
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COMPRESSED AIR
STORAGE FACILITY
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1
VERTICAL AND HORIZONTAL
PRESSURE BOTTLES
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VERTICAL
PRESSURE
BOTTLES
HORIZONTAL
PRESSURE
BOTTLES
FEET
10 0 50
5 0 15
METERS
Dimensions Ezpressedin Feet
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Probable Compressor Building
Compressed air for the compressed air storage facility is supplied by a probable
compressor building located nearby (Figure 8). The probable compressor building is
equipped with four large vertical air dryers and could also house some test facilities in
addition to the air compressor. Because of the limited photographic interpretability, the
cooling system for the probable compressor building cannot be identified. A cooling system
is essential for cooling compressed air which has become heated during the compression
process. It is also needed for cooling compressors. Construction of the probable compressor
building took place between September 1963 and September 1964.
Large Assembly/Shop Building
This large structure (Figure 8) has overall measurements of approximately 335 feet
(102.1 meters) by 315 feet (96.0 meters). It comprises three major sections: a main assembly
bay; an assembly/shop section; and an administration and engineering section. The main
assembly bay measures approximately 315 feet (96.0 meters) by 65 feet (19.8 meters) and is
approximately 30 feet (9.1 meters) high. The assembly/shop section measures
approximately 315 feet (96.0 meters) by 240 feet (73.1 meters) and is made up of eight
adjoining bays. The administration and engineering section measures approximately 315
feet (96.0 meters) by 35 feet (10.6 meters) and is three stories tall. The building provides a
total of approximately 127,575 square feet (11,852.1 square meters) of floorspace which
could be used for assembly of prototypes of aircraft or aircraft systems. It could also house
additional test facilities. Construction of this building was very slow. It was under
construction when first seen in September 1961 and was not observed to be complete until
September 1964.
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Pei-thing Institute of Mechanics
NA
39-59-30N 116-20-38E
ACIC. USATC, Series 200, Sheet 0381-01, scale 1:200,000
NA
GMAIC 01-70
INTRODUCTION
CH
The Peking Institute of Mechanics is an institute of the National Academy of Sciences,
located in the university district in the northwest suburbs of Peking (Figure 1).
The aerodynamic research and development portion of this institute consists of two
separate areas, designated as area I and area II.* Area I (Figures 10 and 11) is situated in
the eastern section of the large complex of laboratory and institutional-type buildings
which make up the National Academy of Sciences. Area II (Figures 13 and 14) is located on
the northwest side of this large complex of buildings. The facilities in both of these areas
were constructed almost entirely between June 1959 and August 1962.
AREA I
This area is separately secured by a wall. It contains five major structures and ten small
support structures (Figure 11). A probable fuels laboratory including seven major
structures and four gasholders, two large and two small, is located. in an adjacent area. The
five major structures are identified as two probable test buildings, a compressor building, a
compressed air storage facility, and a large warehouse. The probable test buildings (Figure
12) do not appear to have vents, exhaust outlets, or other ducting normally associated with
a wind tunnel or test building. The interpretability of available photography of this
installation does not allow for a detailed examination of its facilities.
The compressed air storage facility (Figure 12) consists of three large pressure spheres,
~ They are positioned between the two
probable test buildings, and a single header could provide air flow to both buildings. The
three pressure spheres have a volume of approximately 21,481 cubic feet (611.1 cubic
meters).
The compressor building is located near the center of the area. There are, five small
vertical probable air intake stacks and two vertical probable air dryers along the north side
of the compressor building. A cooling system for the compressor building cannot be
identified on presently available photography.
AREA II
It is difficult to define the exact limits of this area. The area being considered contains
three major structures and 25 small support structures (Figure 14). The major structures
are a closed circuit low-speed continuous-flow wind tunnel, a large five-story institutional-
type building, and asingle-story administration laboratory building. The low-speed wind
tunnel (Figure 15) is very similar to, although smaller than, the low-speed wind tunnel
located at Shenyang Airframe Plant 112. The interpretability of existing photography of
this area precludes a detailed examination or mensuration of the wind tunnel; however,
Figure 15 provides some approximate dimensions.
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Shen-yang Airframe Plant 112
NA
41-52-07N 123-26-O1E
PACAF. USATC, Series 200, Sheet 0290-11, scale 1:200,000
NA
GMAIC 01-70
250523
INTRODUCTION
CH
Shenyang Airframe Plant 112 is located approximately 4 nm north of Shenyang, China
(Figure 16). The research and development area at Airframe Plant 112 is situated on the
north side of the plant. This is the only Chinese research and development area of this type,
located within the confines of an aircraft plant.
The research and development area (Figure 17) contains a subsonic, closed circuit
continuous-flow wind tunnel and a gas dynamics facility. * These facilities were in the mid-
stage of construction when they were first seen on photography of August 1961. The rate of
construction for the closed circuit wind tunnel was very slow, and the tunnel apparently did
not attain operational status until late 1964. The gas dynamics facil-ity was probably
operationally complete by the fall of 1965.
The entire research and development area is surrounded by a wire fence.
Transportation services include rail, a network of good all-weather roads, and the adjacent
Shen-yang/Pei-ling Airfield
SHEN-YANG
AIRFRAME
PLANT 112
SH EN-YANG/
YU-HUNG-TUN
AIRFIELD ~
SH EN-YANG/
PEI-LING
AIRFIELD
l\
SH EN-YANG/
TUNG TA
AIRFIELD ~
~~Railroad; single
Road
12318' 123 ~3
NPIC M-es2e
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SH EN-YAN G
HUN HO
AIRFIELD
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MAJOR FACILITIES
Closed Circuit Continuous-Flow Wind Tunnel
This is a typical subsonic closed circuit continuous-flow wind tunnel (Figure 18). The
absence of an air exchanger or some other type of cooling system plus the small size of the
fan-drive section indicate that the tunnel probably operates within the low subsonic range
(0 - 380 mph). The size of the tunnel's test section is unknown, and no attempt has been
made to determine its size for this report. The entrance cone has a width of approximately
22 feet (6.7 meters) at the point where it enters the section which contains the test and data
reduction operations. The exit cone measures approximately 17 feet (5.2 meters) wide at its
point of emergence. The three-story section that joins the test and data reduction sections
probably contains space for additional data reduction, administration, and a model
buildup area.
Gas Dynamics Facility
The gas dynamics facility (Figure 18) was still in a mid-stage of construction when it
was observed for the second time on photography of June 1962. The facility at that time
consisted of 15 pressures spheres, bases for nine additional pressure spheres, a probable
wind tunnel building, and a small combination wind tunnel and compressor building.
Construction was at a standstill for a period of almost two years: when construction finally
resumed during the summer of 1964, the facility was dismantled, moved several hundred
yards north, rebuilt, and significantly enlarged. The small wind tunnel and compressor
building was left intact and a new, much larger combination wind tunnel and compressor
building was constructed. The old tunnel building probably now serves as a model shop or
utility building.
It is difficult to determine the exact number of tunnels or test units housed by the new
wind tunnel and compressor building. The identification of four probable exhaust outlets
on the south side of the building could indicate the presence of several small tunnels, of
which any one or all could have the capability to operate as an intermittent blowdown wind
tunnel. Six small probable air intakes and four vertical probable air dryers are located
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along the north side of the building.
Although the gas dynamics facility presently contains only 15 pressure spheres as
opposed to the 24 pressure spheres planned for the original facility, 24 horizontal pressure
bottles were added providing increased storage for high pressure air. Each of the spheres
approximately 6,350 cubic feet (1,798.0 cubic meters).
has a volume of
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The air flow to 25X1
and from the tunnel and compressor building, to the pressure bottles, and to the spheres is
through an underground header system. The horizontal pressure bottles are stacked two
high and arranged in two rows containing 12 bottles each. Air flow from the pressure bottles
on top feeds into the pressure bottles on the bottom which are connected to the
underground header system. Cooling for compressors and tunnel components is provided by
a three-cell forced-draft cooling tower and an underground water tank, 25X1
located adjacent to the wind tunnel and compressor building. 25X1
The probable wind tunnel building (Figure 18) is connected to the underground header
system leading from the pressure spheres. The structure is relatively large and could
contain several blowdown-type wind tunnels. This building could function as a second
compressor building ;however, this is unlikely since the building has no visible air dryers,
air intakes, or cooling system.
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Hsi-an Aviation Institute
NA
34-14-40N 108-54-50E
CH
SAC. USATC, Series 200, Sheet 0384-15, scale 1:200,000
GMAIC 01-70
NA
INTRODUCTION
The Hsian Aviation Institute is a small research and development area located within
the northern boundary of the Northwest Industrial University in the southwest section of
Hsian, China (Figure 21). It is situated approximately 2 nm from the center of the city near
Hsi-an/Hsi-kuan Airfield
The research and development area contains a testing building, a compressed air
storage facility, a circular probable test structure, a small shop building, four small utility
buildings, two small buildings under construction, and a small lake or cooling pond
(Figures 22 and 23.) ~ The area is separately secured from the main university campus, and
its only access appears to be controlled. Transportation services consist of good all-weather
roads and the nearby airfield.
The significant facilities contained by the research and development area are analyzed
in the following paragraphs which include functional and chronological data. Other
facilities, which include the small shop building and the four small utility buildings, were
complete when they were first seen in March 1959. The two small buildings under
construction were first observed on photography of September 1963, and little progress has
been made since that date.
HShAN/
LIN?TUNG
AIRFIELD
HSI'AN/
HSI-KUAN
AIRFIELD/
HSIAN
AVIATION
INSTITUTE
MAJOR FACILITIES
Test 13uildi ng
The test building is located on the west side of the research and development area. It
was first seen on photography of March 1959, at which time it consisted of two small
parallel probable utility buildings. There was no apparent change in the status of the two
buildings until September 1963 when construction of a small annex began. The annex was
completed by October 1964, joining the two small parallel buildings and forming what is
now a C-shaped test building (Figure 24). During this time, the adjacent compressed air
storage facility was added. The test building and the compressed air storage facility were
probably operationally complete when observed on photography of October 1964. The test
building probably houses at least one small intermittent blowdown-t e wind tunnel in
YP
each of its two wings. This is indicated by the arrangement of the compressed air storage
facility.
Compressed Air Storage Facility
Compressed air to drive the wind tunnels housed by the test building is stored in the
adjacent compressed air storage facility. This facility consists of 36 horizontal and 18
vertical pressure bottles (Figure 24). The horizontal pressure bottles are aligned in three
rows, each consisting of 12 bottles stacked two high. They supply high pressure air for use
by one wing of the test building. The vertical pressure bottles are in two rows of nine bottles
each, and they provide high pressure air to the other wing of the test building.
compressor ui ding to supply
compressed air to the compressed air storage facility has not yet been identified at this
installation, possibly because of the limited interpretability of available photographic
coverage.
Circular Probable Test Structure
This is the latest structure to be erected in the research and development area.
Construction was initiated some time between June 1967 and April 1968. It is difficult at
this time to determine the exact function or construction status of this new facility. The
probable test structure (Figure 23) consists of a circular wall/barrier measuring
approximately 125 feet (38.1 meters) in diameter A concrete
pad almost circular in shape is located in the center of the enclosed area. It has a maximum
diameter of approximately 50 feet (15 meters). Access to the enclosed area is on the south
side of the structure. A small probable control building is adjacent to its north side.
Additional photographic coverage should eventually reveal the purpose of the structure.
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