NAVWEPS REPORT 7291 · NAVWEPS REPORT 7291 WIND-TUNNEL TESTS OF THE NAVY LOW-DRAG BOMB AT ANGLES OF...
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NAVWEPS REPORT 7291 • WIND-TUNNEL TESTS OF THE NAVY LOW-DRAG BOMB AT ANGLES OF ATTACK UP TO 70 DEGREES .U) * .. 1.,•, 4 OClOBER 1960 1," I . U.S. NAVAL ORDNANCE LABORATORY 4 WHITE OAK, MARYLAND I C 1
Transcript of NAVWEPS REPORT 7291 · NAVWEPS REPORT 7291 WIND-TUNNEL TESTS OF THE NAVY LOW-DRAG BOMB AT ANGLES OF...
NAVWEPS REPORT 7291
• WIND-TUNNEL TESTS OF THE NAVY LOW-DRAG BOMB AT ANGLES OF
ATTACK UP TO 70 DEGREES .U)
* .. 1.,•,
4 OClOBER 1960 1,"
I .
U.S. NAVAL ORDNANCE LABORATORY
4 WHITE OAK, MARYLAND
I C 1
UNCLASSIFIEDNAVWEPS REPORT 7291
Aerodynamics Research Report 125
WIND-TUNNEL TESTS OF THE NAVY LOW-DRAG BOMB ATANGLES OF ATTACK UP TO 70 DEGREES
Prepared by
V. L. SchermerhornF. J. le-Meritte
ABSTRACT: This report presents the results of an investigationin the NOL Supersonic Tunnel No. 1 to measure the staticstability and drag of the Navy low-drag bomb at angles of attackup to 70 degrees. These data were obtained at IMach numbers of0.40, 0.60, 0.80, 1.53, 1.76, and 2.03.
PUBLISHED MARCH 1961
U. S. NAVAL ORDNANCE LABORATORYWHITE OAK, MARYLAND
UNCLASSIFIED
UNCLASIFIEP
1"2-"
NAWEPS REPORT 7291 4 October 1960
The purpose of this investigation was to obtain stability anddrag data at high angles of attack on the Navy low-drag bomb fortrajectory calculations. The wind-tunnel test was performed atthe request of the Naval Weapons Laboratory (reference (a)),-tnder Task Number 526. Other reports on the low-drag bomb shapeare given in references (b) through (m).
W. D. COLEMANCaptain, USNCommander
R. KENNTETH LOBBBy direction
U S.
I~i,
UNCLASSIFIED
UNCLASSIFIEDNAVWEPS REPORT 7291
CONTENTSy Page
INTRODUCION ......................................"-"A"ERODEL, ATI C tt 1QE ,T
MODEL, TEST TECHNIQUES, AND DATA REDUCTION ................ 2DISCUSSION .................... ... ...... .2REFERENCES ........ ... .. ............................. 3
ILLUSTRATIONS
Table I Index of plotted data
Figure 1 Sketch of Navy Ger•irai Purpose Low Drag Bomb
Figures 2- 7 CN, Ca, C•, C0 , ant Cd vs. a for 0 - 0, -22.5,
and -45 degrees A•ach number 1.53
Figures 8-13 CN, tco C , C , and CA vs. a for 0 - 0, -22.5,
-45 degrees Mach number 1.76
Figures 14-19 Ci, , o, C C, and CA vs. a for 0- 0, -22.5,
-45 degrees Mach number 0.40
Figures 20-25 tN' C8' C*, C., and CA vs. a for 0 - 0, -22.5,
-45 degrees Mach number 0.60
* Figures 26-31 CN, C V, CP C., and C vs. a for 0 - 0, -22.5,
-45 degrees Mach number 0.80
. Figures 32-37 CN , cot Ci, C., and CA vs. a for 0 - 0, -22.5,
-45 degrees Mach number 2.03
0
0
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UNCLASSIFIEDNAVWEPS REPORT 7291
WIND-TUNNEL TESTS OF THE NAVY LOW-DRAG BOMB ATANGLES OF ATTACK UP TO 70 DEGREES
INTRODUCTION
1. The low-drag bomb is a standard Navy external store carried
by high speed aircraft. The MK 81, 82, 83, and 84 bombs usethe low-drag bomb shape as tested in this investigation.
2. This report gives the results of a wind-tunnel investigationto determine the stability and drag coefficients at high anglesof attack (up to 70 degrees). The coefficients are necessaryfor trajectory calculations. The data were obtained at Machnumbers of 0.40, 0.60, 0.80, 1.53, 1.76, and 2.03.
AERODYNAMIC SY4BOLS
A reference area (based on maximum body diameter)
c.g. center of gravity, 3.64 calibers forward from the base
CA axial force coefficient (FA/qA)
CO pitching moment coefficient (Mo/qAd)
0N normal force coefficient (FN/qA)
Cy side force coefficient (Fy/qA)
0C rolling moment coefficient (M0 /qAd)
C yawing moment coefficient (M .!qAd)
Sd reference diameter (maximum body diameter - caliber)(1.5 in)
FA axial force (lbs)
FN normal force (lbs)
F y side force (lbs)
M 0 pitching moment (in-lbs)
Me rolling moment (in-lbs)
M * yawing moment (in-lbs)
q dynamic pressure (psi)
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UNCLASSIFIEDNAVWEPS REPORT 7291
a angle of attack (deg)S0angle of roll (0 -00 with fins in horizontal and
vertical planes respectively) (deg)
MODEL, TEST TECHNIQUES, AND DATA REDUCTION
3. A sketch of the model is shown as Figure 1. Th- data wereobtained using a six-component interna; strain-gage balance(reference (n)). These data were recorded on IBM cards usingthe automt tic data recording system explained in reference (o)).The IBM 704 machine was used to reduce the wind-tunnel data tocoefficient form. A correction was made to the data for theelastic deflection of the sting due to the aerodynamic loading.
DISCUSSION
4. Six-component data were desired over a Mach number rangefrom C.40 to 2.03 at angles of attack up to 70 degrees. At thesupersonic Mach numbers the model size restricted the maximumangle of attack. At a Macb number of 1.53, the maximum angle ofattack was 10 degrees, Mach number 1.76 the maximum angle ofattack, 12 degrees, and at Mach number 2.03 the maximum angleof attack, 30 degrees.
5. The data are plotted in coefficient form versus angle ofattack in Figures 2 through 37. An index of the plotted datais presented in Table I.
2UNCLASSIFIED
-- - .°-A --.t.- . .. .. .-Z. ... ....... "*" - -.' , -'. " -- - . '. -, -• ••••• • • ••5 .• .•• " ,
NAVWEPS REPORT 7291
REFERENCES
(a) Wind-t.iinel request (WTR 592) (1960)(b) Shantz, I., and Groves, R. T., "Subsonic Damping in Pitch
Measurements nf the EX-10, EX-30, and 6" Test Vehicle,"NAVORD Report 4025, Confidential, (1958)
(c) Long, J. E., "Free-Flight Investigation of the Stabilityand Drag of the FX-10 General Purpose Bomb," NAVORD Report2916, Confidential, (1953)
(d) Long, J. E., "Low-Yaw Data on the Low Drag Bomb (EX-010)at Transonic Speeds (3,.7-t M1l.4)," NAVORD Report 4227,Confidential, (1956)
(e) Long, J. E., "Roll Coefficients for the Low Drag B~mb(EX-10) in the Transonic Velocity Region (0.65- Ml.31),"NAVORD Report 4389, Confidential, (1956)
(f) Gauzza, H. J., "Aeroballistic Investigation of the EX-10Bomb at Subsonic Speeds," NAVORD Report 2814, Confidential,(1953)
(g) Greene, J. E., "Static Stability and Magnus Characteristicsof a Low Drag Bomb at Low Subsonic Speeds," NAVORD Report4112, Confidential, (1956)
(h) Greene, J. E., "Static Stability and Magnus Characteristicsof the U. S. Navy 1000 Pound Low Drag Bomb at TransonicSpeeds," NAVORD Report 4329, Confidential, (1957)
(i) Piper, W. D., "Static Stability Characteristics of theEX-10 Low Drag Bomb," NAVORD Report 4503, Confidential,(1958)
(j) Crogan, L. E., "Drag and Roll Coefficients at Subsonicto Supersonic Velocities of 1/7-Scale Free-Flight Modelsof the 1000 Pound Low Drag Bomb (EX-10)," NAVORD Report6661, Unclassified
(k) DeMeritte, F. J., Gauzza, H., "Wind-Tunnel Investigationof Various Configurational Modifications of the Low DragBomb," NAVORD Report 4053, Confidential. (1959)
(1) DeMeritte, F. J., Gauzza, H., Shantz, I., "MiscellaneousWind-Tunnel Tests on the Low Drag Bomb," NAVORD Report5702, Unclassified, (1959)
(m) Piper, W. D., DeMeritte, F. J., "Summary of the NOLInvestigations to Date of the Aerodynamic Characteristics"of the Navy Low Drag Bomb," NAVORD Report 5679, Confidential,(19b0)
(n) Shantz, I., Gilbert, B. D., and White, C. E., "NOL Wind-Tunnel Internal Strain.-Gage Balance System," NAVORD Report2972, Unclassified, (1953)
(o) Gilbert, B. D., "Automatic Data Processing System (ADAPS)for the Supersonic Wind Tunnels," NAVORD Report 2813,Unclassified, (1953)
3
NAVWEPS REPORT 7291
TABLE I
INDEX OF PLOTTED DATA
Figure Run Mach 0 a Coefficients PlottedNo. Number No. deg deg
2 8 1.53 -45 0-10 CN, CO, Cy, C
3 8 1.53 -45 0-10 Cot C0'A A
4 9 1.53 -22.5 0-10 CN, C C C
5 9 1.53 -22.5 0-10 co C A
6 10 1.53 0 0-10 C CN' Cy C,
7 10 1.53 0 0-10 C C0'A
8 71.76 -45 0-12 CN, CQ. Cy C,
9 71 7(; -45 0-12 CO, C A
10 1. 76 -22.5 0-12 C N, C"1 Cy C,,
11 1.76 -22.5 0-12 CO, CA
12 5 1.76 0 0-12 CN, C•, (y C
13 5 1.76 0 0-12 C, CA
14 18,20,21 0.40 -45 0-70 C., C~ , y C,
15 18,20,21 0.40 -45 0-70 0, CA
16 19,22 0.40 -22,5 0-70 U 0 C
17 19,22 0.40 -2 -.1 0-"0 C A
16 23 0.40 W 30-70 N' , Y'( C.
.A
NAVWEPS REPORT 7291
TABLE I (Cont.d)
Figure Run Mach 0 a Coefficients PlottedNo. Number No. deg deg
19 23 0.40 0 30-70 Co, CA
20 17,27,34 0.60 -45 0-70 CN, C, Cy, C
21 17,27,34 0.60 -45 0-70 Co, CA
22 16,26 0.60 -22.5 0-70 CN, C. , Cy, Cy p
23 16,26 0.60 -22.5 0-70 Cot C A
24 15,24,25, 0.60 0 0-70 CN, C, Cy, C,33
25 15,24,25 0.60 0 0-70 C0 , CA33
26 28,31 0.80 -45 29-70 CN' CQ, C C4
27 2g,31 0.80 -45 29-70 Co, CA
28 12,29 0.80 -22.5 0-70 C C C CNI CQ' CY' Cd'
29 12,29 0.80 -22.5 0-70 C0 , CA
30 11,13,14, 0.80 0 0-70 CN, CQ, Cy, C,30,32
31 11,13,14, 0.80 0 0-70 Cot CA30,32
32 1,2 2.03 -45 -6-30 C, C, Cy, C,Nop
33 1,2 2.03 -45 -6-30 C0, tCA
34 3 2.03 -22.5 -0-30 C ', C• C.,
35 3 2.03 -22.5 -0-30 C0 0 C A
36 4 2.03 0 -0-30 .', * y .
37 4 2.03 0 -0-30 C0 0 "A
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UNCLASSIFIED
NAVWEPS REPORT 7291
Distribution ListNo. of
*" CopiesChief, Bureau of Naval WeaponsDepartment of the NavyWashington 25, D.C.
Attn: RMMO-42 3Attn: RUGA-422 1
Naval Weapons LaboratoryDahlgren, Virginia
4 Attn: Code KBB 3
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