~ii:!:i:!::!i!i!![i:i' · 2015. 3. 9. · •I~ • • • FOREWORD The purpose of this document...
Transcript of ~ii:!:i:!::!i!i!![i:i' · 2015. 3. 9. · •I~ • • • FOREWORD The purpose of this document...
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•MAY 1 3 1969 1='~
N74-70664
Unclas00/99 16268
MANNED SPACECRAFT CENTERHOUSTON,TEXAS
May 12,1969
MSC INTERNAL NOTE NO. 69-FM-134
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MiSSiON PLANNING AND ANALYSIS DIVISION
Tenhni,.. , , or'-'It II'v'a: d.:rJry Bi"l'J
, ~1,COmm In l(\ , t 1 •
SPS /:1iY REQUI~EMENTS FOR THE
APOLLO 10 (MISSION F) MAY AND
JUNE LAUNCH WINDOWS
(N ASA-TM- X-6 9718) SPS DELTA 5REQUIREMENTS FOR THE APOLLO 10 (MISSIONF) MAY AND JUNE LAUNCH WINDOWS (NASA)27 p
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MSC INTERNAL NOTE NO. 69-FM-134
PROJ ECT APOLLO
SPS b.V REQUIREMENTS FOR THE APOLLO 10 (MISSION F)MAY AND JUNE LAUNCH WINDOWS
By James RotterLunar Mission Analysis Branch
JlII:!\I l? 1 Q{-,QIVI"",,,] ..... , _ 1_'
MISSION PLANNING AND ANALYSIS DIVISION
NATIONAL AERONAUTICS AND SPACE ADMINISTRATION
MANNED SPACECRAFT CENTER
HOUSTON, TEXAS
A ......" .. ,,~. ~ -' /~/ ~ X~ /'MfJfJIVV"'''', ,-.,~.,., , __ /'
Ronald L. Berry, Chief ~Lunar Mission Analysis Branch
Approvep: 0£~~:::L~" ~..!.& John P. Mayer, i ef/". 't.ttssion Planning and Analysis Division
....
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FOREWORD
The purpose of this document is tosystem (SPS) ~v requirements associatedflight times for Apollo 10 (Mission F).the foll~wibg flight time ranges.
a. Case 1 - 34 hours to 55 hours
b. Case 2 - 59 hours to 79 hours
c. Case 3 - 83 hours to 104 hours
describe the service propulsionwith several possible transearth
Four cases are considered with
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d. Case 4 - 107 hours to 128 hours
For all cases considered, the return is to the Pacific at 1650 Wlongitude; therefore, the flight times differ by approximately 1 day fromcase to case. The lunar parking orbit (LPO) stay time for launch onMay 18 is 61.5 hours. Data for all other days were computed with-a51.5-hour LPO time which has since been increased to 53.5 hours for alldays except June 17. The LPO time for launch on June 17 has beee in-creased to 61.5 hours. The transearth trajectories for May 18 and May 20and for June 17 and June 19 do not reflect the recent changes in LPOorientation for these launch dates.
The increase in LPO time (51.5 hr to 53.5 hr) will decrease thetransearth flight times for these days by approximately 2 hours. Theeffect of this change on the ~V requirements and ~V reserves can beapproximated from figure 3.
Each plot for each day has the nominal transearth flight time rangefor that day noted; the shortest flight time is for a launch on a 1080
launch azimuth, second injection opportunity, and the longest flight timeis for a launch on a 720 launch azimuth, first injection opportunity.The curves for the nominal flight times are labeled. The 1-, 2-, and3-day longer flight time curves are laheled P+l, P+2, and P+3, respec~tively. The I-day earlier flight time curves are labeled P-l. Thesedata are in the format requested by the Flight Control Division.
The SPS ~V reserves associated with the cases considered are presentedin figure 1. The three major SPS burns are the first lunar orbit inser-tion maneuver (L01-l), the circularization maneuver (L01-2), and the
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transearth injection maneuver (TEl) .. Allowance is made for a translunarmidcourse ~V of 120 fps. The LM rescue ~v is not included. Duringtransearth coast, 700 pounds of SPS propellant is deducted to allow fordispersions and other uncertainties. Flight times and TEl ~V's werecomputed by use of a conic simulation. The TEl ~V's were biased to beconsistent with integrated simulations. The biases were determined byplotting the differences between conic and integrated TEl ~V's versustransearth flight times from previous launch windows.
The SPS ~V re~uired above nominal for the different cases is presentedin figure 2. The nominal flight time missions are indicated by theo fps lines on the figures. The additional ~V is negative for the longerflight time missions, which indicates the ~V savings associated withthese missions.
The approximate TEl ~V's re~uired as a function of flight time forthe total May and .June launch windows are presented in figure 3.
The nominal transearth flight times and TEl ~V's generated arepresented in table I.
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FIGURES
• Figure Page1 SPS delta velocity reserves assuming varioustransearth flight times
(a) May 18, 1969 . 2.. (b) May 20, 1969 3(c) May 23, 1969 4(d) May 24, 1969 5(e) May 25, 1969 6(f) June 17, 1969 7(g) June 19, 1969 8(h) June 22, 1969 9I • \ June 23, 1969 10~ l)(j ) June 24, 1969 11
2 TEl delta velocity above nominal required for various
• transearth flight times(a) May 18, 1969 12(b) May 20, 1969 13(c) May 23, 1969 14(d) May 24, 1969 15(e) May 25, 1969 16(f) June 17, 1969 17(g) June 19, 1969 18(h) June 22, 1969 19( i) June 23, 1969 20(j) June 24, 1969 21
3 TEl f:,V requirements as a function of transearth flighttime for the Apollo 10 launch window . . . . . 22
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TABL
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MIN
AL
TRA
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TTI
MES
AND
TE
l~V'S
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Lau
nch
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deg
7290
108
7210
8
Op
po
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nit
yF
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Fir
st
Fir
st
Sec
ond
Sec
ond
Dat
e,m
on
th-d
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lig
ht
t:lm
e,T
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Fli
gh
tti
me,
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l~V,
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gh
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me,
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tti
me,
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Fli
gh
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me,
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hr
fps
hr
fps
hr
fps
hr
fps
hr
fps
5-18
52.9
3694
50.4
3874
48.6
4013
51.3
3799
47.1
4150
5-20
64.:_
3074
61.9
3145
60.0
3212
62.7
3121
58.6
3271
5-23
70.:_
2921
68.0
2961
66.4
2997
68.8
2944
65.1
3026
5-24
71. ~
)28
8469
.829
1267
.629
5170
.129
0666
.229
80
5-25
72.9
2858
72.3
2880
70.1
2914
72.6
2876
68.8
2937
6-17
64.~
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7962
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5260
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1463
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2459
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70
6-19
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5165
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9963
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4766
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8162
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86
6-22
74.0
2848
72.4
2868
70.2
2901
72.7
2865
68.9
2923
6-23
76.8
2830
75.2
2846
73.0
2877
75.4
2844
71.6
2894
6-24
79.4
2821
78.0
2833
75.5
2861
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