Actually you want to glide back at the correct McCready
speed for the strength of the last thermal you use.
Climb just high enough to give yourself a reasonable
safety margin, for which you need a glide calculator
of some sort. If you are flying at 60 knots after using
5 knot thermals you are flying far too slowly for the
conditions (assuming that you are trying to race).
Did you mean that rough air Vne is 100 knots? This
sounds like a more reasonable inter thermal speed for
the conditions. I would suggest that you should take
any thermal that gives you at least a comfortable 5
knots climb rate.

Derek copeland


At 04:12 10 March 2006, Bagmaker wrote:

Newbie help required!
Lets suppose I am on a shallow final glide, 60k out
in my 40:1 ship
cruising at 60 knots. Recent thermals have been at
least 5 knots and
am coming into some big lift. For the discussion rough
air Vne is 10
knots.
What strength thermal should I take to increase finishing
speed to Vn
and how much (if any) time will this save me?
How do I estimate this at the time? What is the latest
point on trac
to take such a thermal?

Thanks, Bagmake


--
bagmaker