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AD305569

Approved for public release; distribution isunlimited.

Distribution authorized to U.S. Gov't. agenciesand their contractors;Administrative/Operational Use; FEB 1959. Otherrequests shall be referred to Development andProof Services, Aberdeen Proving Ground, MD.

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1/' [THIS DOCUMENT CONSISTS OF#*/.PAGES. COPY !'/<f. OF. fQ.COPIES.

5 07!2 01014162 ^^^ ^^^ ß^OOf G>&UUCed

BEFERENCE COPY RETORT NO. DPS/TW-418/15

ARTILLERY DIVISION

REPORT ON

TECHNICAL LIBRARY

DEVELOPMENT OF SHOT, 90/40-MM, APFSDS, T320 (U)

FIFTEENTH REPORT ON ORDNANCE PROJECT NO. TW-418

(D. A. PROJECT NO. 5A04-03-084)

(PICATINNY ARSENAL TPR NO. TE-174)

Rtgradod

0. G. MILLER

FEBRUARY 1959

By authority

Dau n .(rCU^—oX

j/r ffiO*o<rS6?]

BETAI^ORDEBTROYPER AR 380-5 AND AR 345-mOR UOMPAR&BLE AF OR NAV}

kK£G0LATI0NS. _ DO HOT ÄfiTOßÄ

Ahendeen ßncvUuf Qiaund

OOMWHfffltL

Reproduction of this document, in whole or in part, it

prohibited except with permission of the issuing office; how-

ever, ASTIA is authorized to reproduce the document for

U. S. Governmental purposes.

All request for additional copies of this report will be

made to ASTIA, Arlington Hall Station, Arlington 12,

Virginia.

AD- 305569

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AND CLEARED FOR PUBLIC RELEASE

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' o£aU bo returned when no longer required, or non . recall by ÄSTL\ to the following kddrcss: .

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UNCLASSIFIED

OTIC REPORT BIBLIOGRAPHY SEARCH CONTROL NO. BFN55I

AD- 305 569 19/1 19/4

ABERDEEN PROVING GROUND MD

DEVELOPMENT OF SHOT, 90/40-MM, APFSDS, T320 (U)

DESCRIPTIVE NOTE: Rept. no. 15, FEB 59 1V MILLER,O.G.:

PROJ: TW 41B

UNCLASSIFIED REPORT (Z ~~ 0 < I ^

DESCRIPTORS: »ARMOR PIERCING AMMUNITION, ARMOR, CARTRIDGES, FIN STABILIZED AMMUNITION, PENETRATION, PROJECTILES, SABOT PROJECTILES, TESTS, VULNERABILITY (U) IDENTIFIERS: 90-MM ORDNANCE ITEMS, T-320 CARTRIDGES(90-MM) (U)

DEVELOPMENT AMD PROOF SERVICES ABERDEEN PROVING GROUND

MARYLAND

AUTHORITY: ORDBB, TPR NO. TE-Y{k OGMiller/jl PRIORITY : 1A 11 February 1959

DEVELOPMENT OF SHOT, 90/UO-MM, APFSDS, T320 (u)

Fifteenth Report on Ordnance Project No. TW-lj-18

Dates of Test: 28 May to 26 June 1958

ABSTRACT (C)

This test was conducted in order to characterize the 90/^O-mm, T320E60 shot as to its plate-penetration capabilities against h.7-inch-thick rolled homogeneous armor. Sufficient rounds were fired to obtain a protection bal- listic limit to determine if the T320E60 shot would penetrate k.7-inch rolled homogeneous plate at 60 degrees obliquity with a PEL of Uh6o fps or less. A six-round protection ballistic limit (three complete penetra- tions and three partial penetrations),, within 150 fps velocity dispersion, of U585 fps was obtained.

It is concluded that the T320E60 shot will not defeat the above plate condition within the kh60 fps requirement.

CONTENTS

PAGE HO.

INTRODUCTION 3

DESCRIPTION OF MATERIEL 3

Items Tested 3

Supporting Materiel 3

DETAILS OF TEST k

Procedures k

Results h

CONCLUSIONS 5

REFERENCES 6

APPENDIX A: CORRESPONDENCE A-l

APPENDIX B: FIRING RECORD B-l

APPENDIX C: SUPPORTING DATA C-I

APPENDIX D: PHOTOGRAPHS D-l

APPENDIX E: DISTRIBUTION E-l

1. (C) INTRODUCTION

In previous tests with the 90/^O-mm, T320 shot, difficulties have "been encountered in attaining the ultimate interdependent goals of accuracy (0.15 mil probable error), muzzle velocity (5200 fps) and armor penetration (5 inches at 60 degrees at 2000 yards) because of the excessive aerodynamic and launching stresses imposed on the projectile components. In an effort to provide a round of ammunition within the short time necessary to meet system schedules, it has been decided that it might be desirable to retreat slightly from the original goals, and reduce the muzzle velocity level to approximately 5025 fps to re- duce the effects of aerodynamic and in-gun heating. The object of this test was to characterize the projectile with the lowered velocity with respect to armor penetration; specifically, to determine whether the 9P/^0-mm Arrow projectile is capable of penetrating 120-mm (if.7-inch) rolled homogeneous armor plate mounted at 60 degrees obliquity with a protection ballistic limit of Uh60 fps or less. In the event the PEL proved to be in excess of kh60 fps, the PEL was to be determined against 115-mm (if.5-inch) rolled homogeneous armor plate mounted at 60 degrees obliquity.

Subsequent to the firing of the first phase of this test it was decided not to reduce the original goals, and consequently the Picatinny Arsenal representative decided not to fire the second phase of this test (h.5-inch plate at 60 degrees).

2. DESCRIPTION OF MATERIEL

2.1 (C) Items Tested

Cartridge, 90/lfO-mm, APFSDS, T320E60, for T20Ö gun, Drawing No. FXP-9OO22, Lot No. PA-E-2621U, without propellant.

2.2 (U) Supporting Materiel

Propellant : MP, ML7, 0.070-inch web size, Lot No. RAD-SR-28-57.

Gauges : Pressure, M3, crusher type, copper cylinder Lot No. 90-55j Frankford Arsenal, annealed Frankford Arsenal 1955«

Gun : 120-mm, T123E1, No. 330.

Tube : 90-mm, T20ÖE1»-, No. 80217.

Carriage : 155-mm Gun, Ml, No. 12.

Recoil : 155-mm Gun, TjA, No. 77.

Armor Plate: k.7-inch-thick rolled homogeneous plate No. O23283, Heat No. 73UO78. Average Bhn: 259. Charpy at -U0 degrees - 81-79.

^MMfOWWfiKSM^IB^ ■

<• *:r<?*"=■• -.

3» IC) DETAILS OF TEST

3.1 Procedures

To obtain the protection ballistic limit against k.7-inch-thick rolled homogeneous armor plate set at 60 degrees obliquity, the plate to be tested •was placed in butts constructed from 8-inch-thick armor plate, and the plate wedged at the desired degree of obliquity (60 degrees).

Velocities were obtained by use of velocity coils placed as follows: From muzzle to 1st coil 149.65 feet. From 1st to 2nd coil 83.90 feet. From 2nd coil to plate 60.20 feet.

Chamber pressures were obtained for each round fired by placing two M3 pressure gauges inside the case at time of loading.

A total of nine rounds were loaded with varying propelling charges calculated to give the desired velocities to obtain three complete and three partial penetrations of the plate within the prescribed velocity dispersion limits of 150 fps as prescribed for V50 Ballistic Limit (Protection), Refer- ence OPM-5O-IO, 11 April 1957.

3.2 Results

A protection ballistic limit of 4585 fps, based upon three complete and three partial penetrations of the plate within 150 fps velocity disper- sion was obtained.

Figure 1 - Front of Plate, k.7-Inch Rolled Homogeneous Armor.

Figure 2 - Rear of Plate, k.7-Inch Rolled Homogeneous Armor.

L

AL

k. (C) CONCLUSION

It is concluded that the T320E6O shot will not defeat h.7-inch armor plate at 6o degrees obliquity within the kh6o fps requirement.

SUBMITTED:

CWO-3 Ord Corps Test Director

REVIEWED:

A/4 tU^liAslnh-^ H. B. ANDERSON Chief, Artillery Ammunition Branch

<^ \&XUk~ H. A. BECHTOL Chief Artillery Division

APPROVED:

H. A. NOBLE Assistant Deputy Director for Engineering Testing Development and Proof Services

REFERENCES

1. Test Program Request Number TE-lU, Picatinny Arsenal.

2. Test Program Request Number TE-lfk, Picatinny Arsenal.

3. QPM 50-10, dated 11 April 1957»

APPENDICES

PAGE

A, CORRESPONDENCE A-l

B, FIRING RECORD B-l

C, SUPPORTING DATA C-l

D, PHOTOGRAPHS D-l

E, DISTRIBUTION E-l

APPEHSDIX A

Gorre opondence ORDNANCE CORPS

PICATINNY ARSENAL DOVER, NEW JERSEY Mr WGMirshak/acm/2277

IN REPLY REFER TO:

TE5

SUBJECT: Test Program Request No. TE-174 for Cartridge, 90/40mm, APFSDS, T320, Project TW-418.

TO: Commanding General Aberdeen Proving Ground Aberdeen, Maryland

ATTENTION: ORDBG-DP-TA, Mr. Youmans

2. Funding Data:

Funds are available under Sub-Project Order No. 70405530-01- 11601-01 and Job Order No. 3030-99-901.

^1

1. Inclosed is Test Program Request No. TE-174, D/A Priority 1A, ^ for testing of the subject round. The cartridges, the description of which is furnished in the inclosed test program request, will be shipped to your Proving Ground in the immediate future. Shipping information and lot numbers will be furnished at that time.

M

\

3. Coordination: v\

a. 0C0-0RDTW, Attention: Mr. S. Weiss.

b. Aberdeen Proving Ground, Attention: Artillery Ammunition Branch, ORDBG-DP-TA, Mr. Anderson, Extension 3311Ö.

c. Picatinny Arsenal - Engineer primarily responsible for the test is Mr. W. Mirshak, telephone Picatinny Arsenal, Extension 2277.

4. Notification for Test Attendance:

Mr. W. Mirshak will attend the test and requests that notification of test firing date be provided this Arsenal. It is understood that test

A-l

CÖfcfilBENJMJ.

pfHtfgf|>gkATI A I

0RDBB-TE5 Nff2i<»-ll A«. SUBJECT: Test Program Request No. TE-174 for Cartridge,

90/40mra, APFSDS, T32O, Project TW-418.

scheduling cannot be accomplished until shipping information is provided, (see paragraph 1 above).

FOR THE COMMANDER:

4 copi es

CC OCO-ORDTW w/lncl APG-Comp Office F.A., ATTN: ORDBA-MIR W.Blittersdorf w/tncl

tfc'sfr ycJc^^^r 1 Incl R. H. WOOD /

1. TPR No. TE-174 Assistant

A-2

«**iv'!3i»*r»i:l5,

** KI Jl I »^ ,p

TG. Mirshak/acm/2277 Test Program Request No. TE-174 (Job Order No. 3030-99-901) Picatinny Arsenal, Dover, N. J. 9 May 1958

1. Material for Test:

a. 19 each Cartridges, 90A0ram, APFSDS, T320E60, for Gun, T208, Lot PA-E-2621U.

b. 350 lbs each Propellant, M17, .070 Web, Lot SR 28-57.

c. 1 each Tube, Gun, T208E4, Ballistic, Serial No. 80217 without muzzle blast deflector (available at Aberdeen Proving Ground).

2. Pro.lect Authority:

a. Ordnance Project No. TW-418.

b. Department of the Army No. 5A04-03-084.

c. 0CM No. A-489 dated 24 May 195/*.

d. Funds available under Sub-Project Order No. 70405530-01-11601-01 and Job Order Number indicated above.

e. Priority: 3A.

3. Object of Development or Experiment:

To develop a satisfactory fin-stabilized, armor- piercing projectile for use in the 90mm Smoothbore Gun for the T95 Tank.

4. History Sketch:

Recent experiences with the 90mm, T320 Shot have indicated that, in order to provide a round of ammunition within the short time necessary to meet systems schedules, it appears necessary to retreat slightly from the ultimate goals of the program. Difficulties have been encountered in attain- ing the ultimate interdependent goals of accuracy (0.15 mils P.E.), muzzle velocity (5200 f/s) and armor penetration (5"/o0° at 2000 yards) because of the excessive aerodynamic and launching stresses imposed on the projectile components.

A-3

BEGBADING DATA CANNOT BE PREDETEIMINED

Test Program Request No. TE-174 (Cont)

As a consequence of this it has been decided to reduce the muzzle velocity level to approximately 5025 f/s at which velocity the effects of aerodynamic and in-gun heating are known to be negligible.

It is now necessary to characterize the projectile with the lowered muzzle velocity with respect to accuracy and armor penetration.

5. Description in Detail of Improvements Made Since Last Proving .Ground Test:

None.

6. Local Tests;

None.

7. Ob.iect of Test;

To determine whether the 90mm Arrow Projectile is capable of penetrat- ing 120mm (4.7 inches) thick rolled homogeieouB armor plate mounted at 60° obliquity with a PBL of 4460 f/s or less.

In the event the PBL against 120mm plate is in excess of 44_60 f/s, determine the PBL against 115mm (4.5 inches) thick rolled homogeneottsfUBÖr, plate mounted at 60° obliquity.

8. Precautions in Handling and Testing;

The usual precautions should be observed in handling and testing« APFSDS ammunition.

9. Recommended Test Program;

a. All rounds should be fired from a 90mm T208E4 Ballistic Tube, Serial No. 80217j no blast deflector or tube supports are to be used.

b. Fire sufficient rounds against 120mm thick rolled homogeneous armor plate mounted at 60° obliquity at a range of 100 yards to establish a Protection Ballistic Limit.

c. In the event the Protection Ballistic Limit in paragraph 9b is in excess of 4460 f/s erect a plate 4.5 inches thick in the same manner and establish a Protection Ballistic Limit.

•A -k

1 REGRADING DATA CANNOT BE PREDETERMINED

Test Program Request No. TE-174 (Cont)

d. The following instrumentation will be required for all rounds unless otherwise directed by the engineer in attendance:

Record nuzzle'velocity and chaabor .pressure. ■ ■

e. Upon completion of all firing the gun shall be borescoped, star- gaged and photographed. Copies of photographs and gun wear charts shall be sent to Watervliet Arsenal and Picatinny Arsenal.

10. References: _____

Test Program Request No. TE-U!». dated 3 January 1957.

11. Report Distribution:

a. Test Report security classification - Confidential.

b. 1 copy - 0C0-0RDTW 6 copies - APG ORDBG-DP-TA 4 copies - Picatinny Arsenal

1 copy - ATTN: Inspection Division 1 copy - ATTN: AAD Lab Planning Office 1 copy - ATTN: 0RDBB-TH8 ' 1 copy - ATTN: CRDBB-TE5

TW hÄ -si R. H. WOOD Chief, Arty Ammo Dev Lab, Samuel Feltman Ammunition Laboratories

A-5

3

fYYurinrum AI DEGRADING DATA CANNOT BE PREDETEIMINED

APPENDIX B

Firing Record

DEVELOPMENT AND PROOF SERVICES ABERDEEN PROVING GROUND, MARYLAND

FIRING RECORD

Plate Test of Cartridge, 90/40-mm, T320E60 (U)

Project No.: 0W-iH8/TE-17^ Development

Firing Record No.: P-63299 Dates of Test: 28 May through

26 June 1958 Authority: Letter Picatinny Arsenal

dtd 21 May 1958, File No. 0RDBB-TE5 -47O(Tff-4l8), MSsR-CI-58-1567, and TPR TE-lJk dtd 9 May 1958

W. 0. No. 332-201-11

(C) ITEM TESTED

Cartridge, 90/^0-nm, APFSDS, T320E60, for T208 gun, Drawing No. FXP-9OO22, lot number PA-E-2621^.

(U) SUPPORTING MATERIEL

Propellant : MP, ML7, 0.070-inch web size, lot number RAD-SR-28-57.

Gauges : Pressure, M3, crusher type, copper cylinder lot number 9C-55> Frankford Arsenal, annealed Frankford Arsenal 1955«

Gun : 120-mm, TL23E1, No. 330.

Tube : 90-mm, T208Elf, No. 80217•

Carriage : 155-mm Gun, Ml, No. 12.

Recoil : 155-mm Gun, T5^, No. 77.

Armor Plate: 4.7-inch rolled homogeneous plate No. 023283, United States Steel Corp., Heat No. 73UO78. Average Bhn at -K0 degrees 259. Charpy at -kO degrees 81-79.

(C) DETAILS OF TEST

To obtain the protection ballistic limit against k.7-inch rolled homo- geneous plate set at 60 degrees obliquity, the plate to be tested was placed

B-l TM^mfrJihiiiirii 11 1 COnriUEtfTIAL

V " "' 111; * i.

in butts constructed from 8-ineh-thick armor plate and wedged at the desired degree of obliquity (6o degrees) with heavy hardwood wedges.

Instrumental and striking velocities were obtained by use of velocity coils located as follows: From muzzle to 1st coil, 1^9*^5 feet. From 1st to 2nd coil, 83.90 feet. From 2nd coil to plate, 60.20 feet.

Chamber pressures were obtained for each round fired by placing two M3 pressure gauges inside the case at time of loading.

To determine the protection ballistic limit, nine rounds were loaded with varying charges calculated to give the desired velocities to obtain three complete and three partial penetrations of the plate within the pre- scribed velocity dispersion limits of 150 fps.

The T208I& Tube No« 80217 was star-gauged, borescoped, photographed. Bore impressions were made before and after firing. Star-gauge measurements taken before and after firing are as follows:

Before Firing After Firing (52 Rounds), (68 Rounds),

inches inches

At 0.1 Inch Forward: 3.669 3.699 At 1.0 Inch Forward: 3°6l0 3.6l6 At 2.0 Inches Forward: 3°6o6 3«6ll

This test was fired from Position "E", Plate Range on an azimuth of 3k degrees at Aberdeen Proving Ground, Maryland, on 25 and 26 June 1958.

(U) ROUND-BY-ROUND DATA

Round-by-round data may be found in Inclosure 1.

(C) RESULTS

From the nine rounds fired, five complete and four incomplete pene- trations of the plate were obtained, for a protection ballistic limit of 4585 fps within a velocity dispersion of 133 fps.

(U) OBSERVERS

Mr. S. Jacobson, Pieatlnny Arsenal, on 25 and 26 June 1958. Mr. J. Hegedus, PIcatinny Arsenal, on 25 and 26 June 1958.

AL

FR No. P-63299 3

Ulis firing record forms a part of the Fifteenth Report on Ordnance Corps Project Ttf-4l8.

SUBMITTED:

cLitfäg- CWO-3 Ord Corps Test Director

REVIEWED: APPROVED:

H. B. ANDERSON -J^HARRY A. BECHTOL Chief, Artillery /^^Chief, Artillery Ammunition Branch Division

1 Incl 1. Round-by-Round Data.

8-3

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B-1+

OOWfDfiWTUL

For« ORDMX-I 21 D«c »9 ™t} ARMOR DATA CHECK SHEET

SIP-12

ORONANCE DEPARTMENT DETROIT ARSENAL

MFG. RECORO NO. 73 U O78

**• United States Steel Corp. AOORESS Munball. PB,

MFG. OATE March 26, 1956 SHiPPEo TO Aberdeen Proving Ground SHIPPEO VIA: FRT X*K XXK

PURPOSE: other >MX «MX MX- SAMPLE: PRIMARY XJBOBJ XXXBOCX

REPRESENTS: 23011 LBS.

CASTING NO.

PRIMARY CONTRACTOR

United States Steel Corp

CONTRACT

DA-36-03if-ORD-2091

ORONANCE OISTRICT (OR ARSENAL)

Philadelphia Ordnance District - Aberdeen Proving Ground

CHEMICAL COMPOSITION

FIRING RECORD NO.

FIRING OATE

SPECIFICATION: MIL-A-I256O (ORD) REVISION AMENOMENT

TYPE ARMOR: HOMO ROLLEO K9EOT>

FURNACE: OH BASIC

zxm. 5ÖÖSC

STEEL SOURCE Homestead Dist. Works MATERIAL FOR USE ON

Shell Test STEEL MILL FRACTURE OATA

Mn SI cr

lTW Nl Mo

3üL LOCATION 1ST INGOT MIO. INGOT LAST INGOT

H2Ö ±£3_ .20 OH, .013. "\,V TOP MIOOLE

-B_ _B_ JB_

BOTTOM B _£_ HEAT TREATMENT

CARBURIZE HOMOGENIZE NORMALIZE HARDEN ORAW

TEMP TIME TEMP TIME AT TEMP TEMP TIME AT TEMP TIME AT TEMP TEMP TIME AT TEMP

II5B~ COOLANT

1652 5 Hours 7 Hours Water ISQfll 5 Hmirs nisn 1 TT""v Mnt.f»y

HEAT NO. INGOT SLAB

1 73U070

PLATF 10. THICK

IZ SIZE REQ BHN

241/277

ACTUAL BHN HEAT TREATEO FRACTURE

323283 120 "X Thh"

See Belpy 41 end-Bi-dte End-B

PHYSICAL PROPERTIES

CHARPY AVE.BHN RAOIOGRAPHIC INSPECTION

TEMP FT LBS X30LKK YP pil ElON t 2" RA % PASSEO OR FAILED

1 -1|Q 81-79 259 Cros > Sectional BHN Ave.

3 AMB. 90-87 -25SL T 269-2^-255-255-2^-269 25Q REMARKS Surface BHN

End Top_ Bot. ~W 259 269" 42" P77 pfls

Company Representative: /s/ M. J. McMahon Inspector for Pittsburgh Ordnance District: /s/ W. A. Honse

BALLISTIC TEST RECORO

TEST PROJECTILE ODL. REQD. VEL.

ACT. YEL.

PROOF FACILITY SIGNATURES

fo be filled in on typewriter (carbon backed) or by hand using India Ink (for reproduction).

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REAR FJCE JFWEECH

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36.00 35.50 31.50 33.50 32.50 31.50 30.50 29.50 28.50 28.05

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13.50 12.50 11.50 10.50 10.00 9T6o

MUZZLE FACE

Borescjpe photograph» and general r\ and 6:30 o'clock.

REAR FACE OF TUBE

26.50 26.00

3*M.

25.00 21.00 23.00 22.00 ZUXL 20.00 19.00 18.55

11.50 1I.00 13.00 12.00 11.00 10.0Q 9.00 8.00 7.00 6.00 5.00 1.00 3.00

_2.»Q0_ 1.00

._5Q_ ao_

BASIC

oiAMET ER

3.671 3*62: 3.7K 3.739 dl 3J8J 3.809 3.833 3.813

5.875 5.883 5.899 5.915 5.931 SiilL 5.963 5.979 5.995 6. QU LQ2&. 6.0II 6.060 6TÖ75 6.092 Ei tlOQ

.106

ew. Im>rea»loi a w ire made

ZERO

/•,oo^.J.^g.A^^

N N

05)

■f-,/TO

Q Allot MEASUREMENTS INDI CATEDTH"

CHAMBER 1/10D0 OF AN INCH

VERTICAL

GAUQE

READING

-,6e>3

OAJ', *.^9l

.. ■ .' •* -t./s >Q\3 J

^W_ T/TW 'JjLjLhlH ~7TV

-,/<?>' £LZ2Ä

•J2*i ,g>7

5ÄUt ■ fll£T .0*g .a 32, .<>/(■>

■/-. «go/ .off

■ <9 3/ jL&Yi .jjjj ■ *S/ ,c9t

>/ot> 7=771

ACTUAL

DIAMETER

tUlA

■TJ$ %tt>6 \7?>

7, $36 t.1t*/7

*.ji-7L

£l *x?. 5-96$. &/?%</- K

I .06I en

fa es 1 4j.PJiS <.0&<S 6.aSt A.Ö19 <./at 4,/tf hags'

taken <f ommenceatnt of main bore at 12tOO

TOTAL LENGTH OF GUN

TOTAL LENGTH OF TUBE

Maximum drpth at eroal m 26.80''

Remarks; Borcscoped.Moderate brass depoe

BASIC

SPECIAL HEASUBEHEHTS

DIFFERENCE

O^O —t0O &

rt#S~ no

,00^ pa 3'

..py£~

.no±> oci>

\QQ V- Ki 70

j-.e<) f »na .<-W^'>

,<%a^. -4U2. Z *ao-

. or\6> Q0&

.GO 3 _£& 2 .(jVl.5

>&&& ,<m6

of commencement i>f main lore at

HORIZONTAL T GAUGE READING

^■oo.^ &6m

HBL ITT? ?>.7t6

m. >/>>?

-./.*</- /AS

.*<?% ,aSf ,oC"7 ,<?/?

.aaS~ .0/ C /•.go t

>*>/ \PYS lei*

\ o %'t .Q?t Jet.

&. >n A.///

ACTUAL OIAMETER DIFFERENCE

U7*. M fit <? 6 1

Sz5 1,X,H v.X^

2ZM \S.**5-

&sM- Stfjrv $.9 ft S353L 6>Oo/

ti'7 ^,0/7

I TZ7 CULL. a?t

LML

aM_6j£C

*<■><■•? C7

»fltfv^t .fldJ ,K.iaS~~

*"' C<t*:

,ee3 ^a^

^7T Q<3Z> _$&_

, OO6 t t>0

,0<?^ >jZa£_ GO

*e>e£ .00 (

f-»oc

o'clock 2^00.

ACTUAL

ROTATION OF TUBE AT BREECH

MOVEMENT OF TUBE AT BREECH

. NUMBER OF.LANOS ANDJROQVES- ,rt, „ „ from rear ffte« nf tub« -Vert. 3-ffU* Hora

te encircling forward edge of oehterlng

BASIC ACTUAL

3-Jtei

cylinder. Moderate copper discoloration cnolrcllng commencement and extending forward (approx) 2.00". Heavy to moterate to light eroalon enolrcllng commence- ment of main bore and extending forward to llO.OO" from rear face of tube. Heavy to light heat checking from commencement forward to 110.00" fron rear face of tube. Light «coring from 36.00" to 18.00", and moderate to heavy scoring from ; Ig.00" to llO.OO" from rear faoe of tube. Heat checking le heavy in eroded area. Longltudnal deposits at various times and dletancea throughout MBJLtlf half of bere. See APG Photograph Noa. B30476 thru B30478 incl., B30A98

RBL STAWED

RODHAN 0c RECORDER

eyQ Ktptf

ö$m AND INSPECTED BY

TIME

PLACE aJ *••' *.)

REVIEWED BY

COMPILATOR

GRAPHED BY

wfe

^^1

fe^ ^^s

Iff

r-

1 ^

-Ä sr 8

On DBG r.rm ZU«5-(B| 4 Apr 57 (Part Z| C-3

APPENDIX D

i t i i I i i t i I i i i i I i i i i I i » i I I i i i i I i i i i | I 1 I I APPROXIMATE

B3(A-76: Bore Photograph Showing Condition of Commencement of Main Bore at 12:00 O'clock, After Firing 68 Rounds.

D-l

r: ■ i i i i ■ ■ i i i i i i i t i i i 1 i i i i i i i i -i I i i i i 1 i i i i APPROXIMATE

B3CA-77: Bore Photograph Showing Condition of Commencement of Main Bore at 6:00 O'clock, After Firing 68 Rounds.

D-2

12:00 O'clock

B30Vf8: Bore Photograph Showing Condition of Commencement of Main Bore After Firing 6Q Rounds.

D-3

12:00 o'clock

IVNHNIIV*

6:00 o'clock

B3(A98: Impressions Showing Condition of Commencement of Main Bore at 6:00 and 12:00 0'Clock, After Firing 68 Rounds.

D-4

APPENDIX E

Distribution

COPY HO. NAME AMD ADDRESS NUMBER OF COPIES

Chief of Ordnance Department of the Army- Washington 25, D. C.

3 ACT?: OEDTW 1

Commanding Officer Diamond Ordnance Fuze Laboratory Washington 25, D. C.

k ACT!: Technical Reference Section 1

Commanding Officer Picatinny Arsenal Dover, Hew Jersey

5 ACT!: Insp Div 1 6 0RDBB-TH8 1 7 0RDHB-TE5 1

Commanding Officer Watertovn Arsenal Watertovn 72, Mass.

8 ACT!: Mr. Hurlich 1

Commanding Officer Detroit Arsenal Center Line, Michigan

9 ATTN: Mr. Salter 1

Commanding General Ordnance Ammunition Command Joliet, Illinois

10 ATTH: ORDLY-ARA 1

Ministry of Supply Staff British Joint Services Mission 1800 K Street, H. W.

11 and 12 Washington, D. C. 2

Canadian Army Staff 2^50 Massachusetts Avenue, N. W. Washington 8, D. C.

13 and Ik ACT!: GSO-1, A&R Sec 2

E-l

COPY NO. HAME AND ADDRESS NUMBER OF COPIES

Commander Armed Services Tech Inf Agency Arlington Hall Station

15 Arlington 12, Virginia 1 vellum

« COHARC Liaison Office 16, 17 and 18 Aberdeen Proving Ground, Mi. 3

19 Havy Liaison Office Aberdeen Proving Ground, Mi. 1

Technical Library Branch 0 Aberdeen Proving Ground, Mi. Original 1 1 copy - Reference 2 1 copy - Record

M'mui iwV-APBi *WT%

,r

I

.

BL [Ml

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