PS: Here is the table for an ASW 27. Ach is the achieved speed in classic climb and glide flight. stf is the classic speed to fly in knots.

|-----Dry ---||----Wet -----|
Mc stf Ach stf Ach
Kt Kt mph Kt mph
0 56 0 65 0
1 65 32 78 32
2 73 45 89 49
3 80 54 99 59
4 86 61 108 68
6 98 71 124 81
8 108 79 138 92


So, MacCready 3 is 80 knot cruise dry, 99 knot wet, and averages 54 mph dry and 59 mph wet.

If you're at Hobbs (say) ad you have achieved 68 mph so far, then you finish at Mc 4 and 108 knots. And if you've achieved 81 mph so far....

This is all just the very flat polar of modern gliders. Nobody flies that fast, which is a puzzle for another day

John Cochrane