Thanks Doug good lesson for me to remember

From:	"Douglas Brunner" <douglasbrunner@earthlink.net>
To:	lml@lancaironline.net
Date:	06/04/2012 09:49 AM
Subject:	[LML] Re: Speaking of defrost
Sent by:	"Lancair Mailing List" <lml@lancaironline.net>

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My presumption is that it came from the defrost.  When I built my plane, I put in a duct system beneath the glare shield that directed hot air up to the canopy.  In retrospect, I think I made it too effective.
 
I used to leave the defrost on long after the canopy had cleared.  I had a long trip “through the soup” in Western Maryland, Pennsylvania and Ohio during which I believe the defrost was on the whole time.  Immediately after that leg the canopy showed some significant cracking/crazing.  
 
Now I switch immediately from defrost to heat (or off) as soon as the canopy is clear.
 
From: Lancair Mailing List [mailto:lml@lancaironline.net] On Behalf Of larry.eversmeyer@faa.gov
Sent: Monday, June 04, 2012 8:57 AM
To: lml@lancaironline.net
Subject: [LML] Re: Speaking of defrost
 

Doug, Where did all of the heat that damage your canopy come from?

Larry Eversmeyer
still building Legacy





Yes, I need defrost – I fly out of KMTN in the Baltimore area.
 
I would suggest judicious use of defrost.  Recently had to replace my canopy due to damage from excessive heat.