Udo Rumpf wrote:

Doug,
it is "not + or -" the total is max .004"
Udo


OK. Sorry. I read your post a bit too quickly. Then +/- .002" as I
originally stated wasn't really wrong? I guess.

Looking again at the 6 Richard Johnson articles I sampled he doesn't really
nail down a precise figure. For example, in a PW5 test Johnson states he
found: "an average wave of about .0065 inches (.165 mm) peak-to-peak over
the main spar region, which is somewhat high for a modern composite
sailplane".

-Doug