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angler,

I am 6' 200lbs and I crawled through the windows a few times while glassing
formers to fit the canopy to the longeron.  I wasn't even on fire!

on the vents, I a going with Horner style vents with 1/2" openings as
apposed to the NASA ducts. these won't let any rain in standing on the
runway (the way mine were cut, the rain could blow right in!) in flight, I
have seen some plenums that slow the air down with a water separator inside
(just a wall for the wet air to hit). I am more concerned about water
accumulating in the aircraft while on the ground. I saw one lancair owner
who drilled a drain hole in his vent box to the outside. maybe it would work
in-flight as well.

Scott