"Don Johnstone" wrote in
message ...
...
Given that the above calculation is made with regard
to the surface wind and that as far as the glider is
concerned until it touches down the direction of the
surface wind is of no consequence to the aircraft
(the relative airflow experienced by a flying glider
has no connection to the wind direction) I fail to
see why the question is being asked. The simple answer
is you have made the calculation based on the windspeed.
Why do you need to worry about your groundspeed once
you have touched down?

Hi Don,

Indeed, the real concern is not about groundspeed...! It's
about the right flying speed to get on the final leg, depending
to the wind direction.

The rule to calculate the airspeed is to increase it if the
wind direction is facing the aircraft, but the rule seams to
say that we shouldn't add anyting when the wind come the
back. Sure, we would not substract anyting to1.3 Vstall
in this case.

Should we add the same amount of knots to 1.3 Vstall,
regardless of the wind direction for every circuit legs?