Question:
how do you propose to protect the edges of the pool from abrasion
from such a cover, roller bearings?
Answer:
Something softer. I'm thinking the "solar cover" might form a skirt
that's a bit wider than the solid part of the cover, so it would lightly
center the solid part, and reduce evaporation and heat loss around the
perimeter. Or the edge might be an inflated pillow ring.
Another possibility is a large rigid foamboard cover hinged along the
edge of a rectangular pool, some sort of giant flap with a reflective
underside that opens during the day and closes at night. (Aaoogah...)
It might be twice as wide as the pool, and articulate into a parabola
during the day. Wind, winches, counterweights, lots of iron...
