"Peter Twydell" wrote in message
...


Are there different grades of canvas?

There sure are.

I associate it with tents, which
can be bloody heavy. I was under the impression that when most aircraft
were fabric covered, if you couldn't get Irish linen, then high-quality
cotton was OK.

Clarification will be gratefully received.


Canvas can be made in many grades and from different
stocks including hemp, linen and cotton. The finer grades
of linen canvas are mainly used for art supplies and photographic
backdrops these days but they are much lighter than the material
used in most tents.

Keith