Dave Martin wrote:
Don't know whether this answers your question!

No bearing on the question, really, though it is
slightly related, and interesting as well.

Ground effect does work with a low wing glider, other

I don't know of any low-wing gliders. Most are mid-wing
and some older types are high-wing, but that difference
is so small I wouldn't expect it to matter. In the
situation I asked about we'd want a safety margin
of perhaps 5 feet or so off the ground in any case.

AFAIK ground effect starts being significant from
approx. half a wingspan off the ground, the effect
being to increase performance, as if you had greater
span.

lived. A few hundred yards rather than miles, but then
I have never tried to go miles.

A few hundred yards would be sufficient for what I had
in mind, provided that the other factors balanced out
and resulted in a net gain in how far you can glide.

Cheers CV