Hi,

Are there UV-meters?

There is a very crude method using test-strips that are sometimes
distributed in pharmacies here in germany, especially in the summer
holiday season. These strips are meant to help people avoid sunburn
by indicating a safe time to spend in the sun.

They are made of cardboard and some UV-sensitive paint covered in
some kind of goo. You are supposed to rub off the goo when you go
out. Put the strip next to you on the beach and when it has
changed color according to a scale and instructions printed next
to it you better get out of the sun.

One could use two of these: Put one on the outside of the trailer
and one inside. Time how long it takes the one on the outside to
discolor to a certain degree. Wait until the one on the inside has
taken the same amount of UV. Divide the times and you should arrive
at a rough estimate of how much UV gets through the trailer.

I do not know of anyone who has made such an experiment on a glider
trailer. I did it for car windows a few years ago.

Ciao, MM
--
Marian Aldenhövel, Rosenhain 23, 53123 Bonn. +49 228 624013.
http://www.marian-aldenhoevel.de
"Flying an An-2 is like making love to a fat lady who's had too much to drink:
there's a lot to work with, it's unresponsive, you're never quite sure when
you're there, and it's big-time ugly."