If I have 2 polars for the same glider, say at 28kg/m2 vs 43kg/m2,
the polar for the heavier glider is displaced to the right and down.
Applying the square root of the ratio of the wing loading, ie sqrt
(43/28), would give the higher speed for the increased loading, what
is displacing the polar down? Is it just the additional profile drag
at the higher speed?