Barrel Life Test with NACO (Navy Cool) Propellant of 5/54 Caliber Barrel Mk 18 Mod 0 Serial No. 16182

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by  Duch J.W.

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U. S. Naval Proving Ground
Dahlgren, Virginia
Barrel Life Test with NACO (Navy Cool) Propellant
of
5"/54 Caliber Barrel Nk 18 Mod 0 Serial No. 16182
by
J. W. Duch
Weapons Development and Evaluation Laboratory
I
NPG REPORT NO. 1532
Task Assignment No.
NPG-S5-5 e-18-3-56
17 April 1957
APPROVED: G. H. WALES
Captain, USN
Commander, Naval Proving Ground
R. DZ.R ISSER
Captain, USN
Ordnance Officer
By direction
RETAIN OR DESTROY IN ACCORDANCK WITH OPNAV INST 5510.IA.
NO REPORT OF DESTRUCTION IS REQUIRED. DO NOT RETURk.
This Document Contains } A g.
Missing Page/s That Are
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Unavailable In The
Original Document
CONFIDENTIAL NPG REPORT NO. 1532
CONTENTS
Page
Abstract.* . . .... . . .. . o. .. ii
Foreword. . . . . . . . . . . . . . . .&.. . . o ie
Introduction. o o *.. . . . . . . . . . . 1
Description of Material e. . . . . . . .* . . . 1
Description of Test Equipment s e . .#. . . . . . 2
Procedure . . . . . o o o o * o o o . . . . . . 3
Results and Discussion.* . . . . . . .. . . . . 4
Conclusions .. . . . . . . . . . . . . . . . . 7
References . . . . . . . . . . . . . .a. . . . . 8
Appendices:
A. Star Gauge Data (Tables 1-14)
B. Tabulation of Velocity Variances (Table 15)
C. Tables of Test Results (Tables 16-28)
D. Distribution
Figures:
1. Graph of Bore Enlargement at Origin of Bore
vs Rounds Fired
2. Graph of Bore Enlargement vs Distance Forward
of Origin of Bore at Various Stages of Wear
3. Graph of Bore Enlargement at Origin of Bore
vs Erosion Gauge Reading
4. Graph of Muzzle Velocity Loss vs Bore Enlarge-
ment at Origin of Bore
5. Graph of Uncorrected Range vs Bore Enlargement
at Origin of Bore
6. Graph of Uncorrected D/R vs Rounds Fired
7. Graph of Fuze Performance vs Rounds..Fired
8. Graph of Temperatures in Cook-Off Round and
External Barrel Temperatures, 28 April 1955
9. Graph of Temperatures in Cook-Off Round and
External Barrel Temperatures, 15 June 1955
CONFIDENTIAL i
CONFIDENTIAL NPG REPORT NO, 1532
?.1
ABSTRACT
lot of 50/54 NACO (Navy Cool) flashless propellant
-A
was evaluated with respect to erosion characteristics in
rapid fire schedules. Erosion was reduced by a factor of
three relative to the standard pyro powder.
_
"CONFIDENTIAL ii
CONFIDENTIAL NPG REPORT NO, 1532
FOREWORD
The firings described in this report were conducted
between 6 April 1955 and 21 December 1955. The tests were
authorized by reference (a), under Task Assignment NPG-S5-
5e-18-3-56, "Gun Barrel Life Tests" (reference (c)). This
is the final report on "Rapid Fire Life Tests of 5"/54 Gun
Barrel Mk 18 Mod 0 Serial Number 16182 using NACO Powder".
Reference (b) replaced the barrel of reference (a) by
barrel No. 16182 Mk 18 Mod 0.
This report was reviewed by the following members of
the Weapons Development and Evaluation Laboratory:
SR.I. ROSSBACHER, Head, Initial Ballistics Branch
D. C. SLOAN, Armament Division Engineer
4(cid:127)D . W. STONER, Assistant Director for Technical
Applications
T. G. WHITE, JR., Captain, U:SN, Director
and by
R. H. LYDDANE, Director of Research
*, CONFIDENTIAL iii
CONFIDENTIAL NPQ REPORT NO, 1532
INTRODUCTION
Three lots of 5"54 NACO propellants, IHBF-24NA,
IHBF-25NA and IHBF-26FNA, were granulated at the Naval
Powder Factory. The Bureau of Ordnance requested that
a rapid.fire life test with the flashless type powder
be conducted in the 5054 Caliber Barrel Nk 18 Nod 0
Serial 16182. The standard 100-round rapid fire sched-
ule was to be used until terminated by the Bureau or
until a definite performance trend could be evaluated.
Cold and hot gun erosion checks were to be fired using
the flashless and the non-flashless type propellants.
DESCRIPTION OF MATERIAL
Propellants IHBF-24NA and IIBF-26FNA are of the
cool single-base low nitration nitrocellulose type with
nominal flame temperatures around 2150*K and the follow-
ing characteristics:
IBEF-24NL IHBF-26FNA
Nitrocellulose 95.19% 92.92%
(%N) 12.01 12.02
Ethyl Centralite 3.78 2.98
Lead Carbonate (basic) 1.03 0.98
Total Volatile. 4.34 4.40
K SO - 3.12
2 4
Length 01479 01479
Diameter 0V267 01266
Perforation Diameter 01023 01022
Perforations 7. 7
Average Web 01050 07050
Grains per lb. 736. 722.
R.Q. (Based on IHBF-3)(%) 79.5 77.3
R*F. (Based on IHBF-3)(%) 89.7 86.0
CONFIDENTIAL 1