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  #11  
Old 01-06-2018, 08:23 AM
chepburn's Avatar
chepburn chepburn is offline
 
Join Date: Apr 2006
Location: Ottawa , Canada
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Quote:
Originally Posted by ronschreck View Post
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).
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  #12  
Old 01-06-2018, 08:56 AM
sjhurlbut sjhurlbut is offline
 
Join Date: Jan 2005
Posts: 546
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Quote:
Originally Posted by psychose View Post
Hello folks,

For the record, I'm NOT looking forward to installing a new canopy...

Thanks in advance,

Normand
RV8 C-GNGN
Fly it to cold lake, AB. I'll sikaflex on a new canopy for you.
Just pay labour and your own material.
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Steve H
Cold Lake, Alberta
RV7A #70015 - C-FZQX - built - sold
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RV7 #70215 - C-GOJU - flying - sold
RV7 #70703 - C-GMIY - flying - sold
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  #13  
Old 01-06-2018, 09:04 AM
Danny King's Avatar
Danny King Danny King is offline
 
Join Date: Dec 2004
Location: Southlake, Texas
Posts: 550
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Quote:
Originally Posted by ronschreck View Post
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?
Yes, a sikaflex canopy cracked without a single hole in it.
Several years ago, on a very cold day, my canopy cracked while parked outside Jay Pratt's hanger. I was there to work on the RV-1 restoration. Extreme cold is not good for RV-8 canopies. During my search for a replacement Aero Plastics canopy an RVer from New Mexico contacted me and said his Sikaflex canopy cracked in his hanger on a cold night. He said no holes were drilled in it. So yes, it can happen!

The expansion rate of the canopy and the frame are very different. I tried something new on the replacement canopy. I drilled all the holes to 1/4 inch. I cut inserts for the canopy holes out of 1/4 outside diameter silicone model airplane fuel line. The inside diameter of the fuel line is 1/8 as are the rivets. Therefore, the canopy has a lot more room to expand or contract without loading itself against an attachment rivet. In addition, the silicone inserts cushion the rivets and canopy from each other.

Knock on wood......So far so good!
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Last edited by Danny King : 01-06-2018 at 09:20 AM.
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  #14  
Old 01-07-2018, 12:55 PM
N258RE N258RE is offline
 
Join Date: Apr 2006
Location: MI
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well my sikaflexed RV-8 canopy cracked today so that makes at least two
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  #15  
Old 02-15-2018, 10:07 PM
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fl-mike fl-mike is offline
 
Join Date: Jul 2005
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Quote:
Originally Posted by Michael Henning View Post
I have a “Todd’s” canopy on my -4. Has anyone taken over the operation or filled the void from Todd?
Lance Logan / Aerocanopy ^^^ a few posts up. ^^^
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