On Thu, 13 Apr 2006 08:25:44 -0600, "Bill Daniels"
bildan@comcast-dot-net wrote:

Yep, done that. The string on the canopy surface is about twice as
sensitive to yaw angles as the one on a one inch tall post. In other words,
the string on the canopy surface 'over-indicates' by about 2:1. I think
that's a good thing.

I'm not so sure...there seems to be a definite hysteresis effect in
the boundary layer. I've experimented with two strings, one on a 3/4"
post and one at its base, and they did NOT respond in sync. I found I
could deflect one left, the other right, and hold it that way for a
second or two.

Note: If you decide to drill, you MUST use a sharp new drill made
specifically for drilling plastic.

Better, I think, to poke it with a hot piece of wire to avoid
stress-raising tool marks. Push from the outside in and pull the wire
on through from the inside...that way you don't get a raised lip on
the outside. It works well for stopping cracks, too.

rj