Originally Posted by ronschreck
Wow, that's the third cracked canopy I have heard of this week! The bitter cold that has enveloped most of the nation this week is bringing a rash of troubles to many. My canopy cracked in September on a 75-degree day! I have installed a new canopy with Sikaflex and hope to never have to do it again. Just curious, has anyone ever heard of a Sikeflexed canopy cracking?
We don't have much choice here if we wish to stay airborne in winter...-25C here this morning and a forecast today like this:
TAF CYOW 061138Z 0612/0712 28015G25KT P6SM BKN100 TEMPO 0612/0616 5SM BLSN BKN080 FM061600 29015G25KT P6SM SCT080 BECMG 0622/0624 29015KT FM070600 29010KT P6SM SKC BECMG 0708/0710 23005KT
However, although my brain is slightly frozen, I WONT go flying in this weather.
Normand is a fellow aviator here in the snowy north and his unfortunate experience led me to do some digging into cold embrittlement of acrylics.
Sorry to say, I couldn't find a lot ... the glass transition temperature didnt mean much in this case (being 85 to 165 degC)
I found one paper " Effect of Extreme Arctic Cold on Materials" http://collections.dartmouth.edu/arc.../EA02b-02.html
The only thing I learned here is that Acrylics are a good choice for use in the Arctic......
What I want to know is... How cold is TOO cold? And is cold really something we should worry about for our canopies?
My personal limit is about -20C (-4F).