wrote:
Of course the rules don't
allow switching sailplanes or even components. You start with
winglets
or tip extensions and you must fly every day with that configuration.
JJ

A way to accomplish this switch within the rules might be to have two
"teams" flying two gliders. The teams would have the same members (2
pilots), who would switch halfway through the contest so one pilot
would fly the first half of one team's flights and the second half of
the second team's flights. Vice versa for the other pilot.

-Richard