In article ,
says...
Yes, I remember a huge glider (well, only 15 m, but so close it seemed
really huge) coming just above my head during such a glide, because
it left the same slope as myself just a few seconds after me, just a
few meters higher and flew just a little faster than me. None of us
could see the other glider just up to this moment.

But there is a simple device that could help in this case, which is
fitted in most motor gliders with a retracting prop: a small rear
facing mirror. I wonder why we don't have such a mirror on every glider.

I've tried mirrors several times over the past 20 years, but haven't
been able to find one that showed a wide enough view and still had a
big enough image of the glider I was trying to see. Perhaps one that
simply showed only what was above and a little behind would work for
the situation you describe, but I think it would frequently be
reflecting the sun into your eyes. The one on my motorglider certainly
does, unless I tip it down.

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Eric Greenwell
Richland, WA (USA)