On May 28, 11:26*am, Andy wrote:
On May 28, 6:02*am, Andy wrote:

*The wind does not change the speed to fly. *It only
impacts best glide speed to a landing.

To be more clear I should have said the wind only impacts speed for
best glide range to a landing. *There are of course also cases where
the next thermal cannot be reached unless wind is taken into account
but that too is a best range solution not a best speed solution.

Andy

Thanks for all the help and suggestions. I was mixing equations too
late at night. Here is the data from the spreadsheet for a Standard
Class glider in MPH.

My understanding from reviewing the theory is these are applicable for
all legs and not just the last. Looks like using about half the wind
speed would be a good rough approximation for most normal speeds.

MC Headwind Zero Tailwind
30 20 10 0 -10 -20 -30
0 71 65 61 58 55 54 52
1 84 77 72 67 64 62 60
2 94 87 81 76 72 69 66
3 103 95 89 84 79 75 72
4 111 103 96 91 86 82 78
5 118 110 103 97 92 88 84
6 125 117 110 103 98 93 89
7 131 123 116 109 103 98 94
8 137 129 121 115 109 103 99
9 143 134 127 120 114 108 104
10 148 139 132 125 119 113 108