Thanks to all who responded, on and off the list. The consensus seems to
be that (like most planes), defroster performance is inadequate on the
ground. Additionally, placing the vent holes in the stiffener directs
the air aft rather than up onto the plexi. Bob Fair's plane moved the
vent holes down from the stiffener to just below the canopy joggle. This
eliminates the moving parts and connections, but the holes are still
facing aft rather than up. It seems that the best choice would be vents
in the glare shield that direct the air straight up, assisted by
electric fans.

Some of the LNC2 guys have mentioned this sort of arrangement. Does
anyone have photos of a setup they are happy with?

Thanks,
Adam Molny
Legacy #151