Phobos tether

	A	B
1	This spreadsheet attempts to approximate the details of tethers attached to Phobos, the first moon of Mars.
2	Errors are virtually guaranteed, use at your own risk.
3
4	The approach is basically to consider small chunks of tether at a time with a worst-case payload tension applied.
5	The sheet appears to give values within a few percent of Pearson's method, with a bit more flexibility to play with the numbers.
6
7	Written by Chris Wolfe, 23 July 2015
8
9
10
11	Changelist:
12
13	7/23/2015	first draft
14	8/5/2015	added multiple materials
15	8/10/2015	added about tab
16	12/8/2015	corrected a significant error in Phobos gravity calculations; many thanks to Hop David for catching the error
17		adjusted annual throughput; this cell now accounts for the fact that delivery or pickup can only occur once per orbit at maximum
18		adjusted 'down' tether charts to conform with 'up' tether charts for better visibility
19
20	To do:
21		multiple climbers
22		validate departure and arrival dV for heliocentric transfers
23		consider moving tethers on rollers
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100