Hi All, I once read an article by a 'boffin' at Cranwell, who stated that
Vx was always 84% of Vy. In other words the two speeds are
mathematically linked... Something like the inverse of the 4th root.

I can understand that the induced drag increases by the inverse square, as
the speed decreases, so there must be one further square root to take into
effect in the equation.

So if you have a high Vy then your Vx will also be high, and the glider
will not turn in the thermals very tightly. Unless you can modify the
wing shape, with flaps, for the two different types of flight.

Pilot Pete