Focus Canopy Painting

[Kenneth Blackwell]

Talking about surface temps in the hot sun..... Color has a big impact. I have one of those IR temp measuring devices and last summer I measured the temps on different colors of monocote from white to saphire blue. With an out side temp somewhere about 90 or so, I saw skin temps rangine from the low 100's for white while the med dark blue was well toward 140-150.

Later this year when it gets warm, I'll do the temp measuring thing again and report the findings for different colors....If I can remember to do it.

I have seen dark canopies that didn't melt, but I would assume that some materials would suffer at 150 deg F.

Cheers,

Ken Blackwell
  ----- Original Message ----- 
  From: s.vannostrand at kodak.com 
  To: discussion at nsrca.org 
  Sent: Friday, March 21, 2003 8:56 AM
  Subject: Re: Focus Canopy Painting



  90 degrees?  That's not a hot day.  2 years ago we had 65 days over 100.  It's routinely 103-105 degrees on the blacktop and the sun is at level 6.  Most epoxys have glass transition at 120 degrees and get rubbery soft.  I've seen fiberglass cowls with thumb holes in them because they were soft when the owner grabbed the plane to apply the starter.  It's during July and August that you guys get back at us Southerners for all the bragging we do about weather at this time of year. 

  --Lance 



       "GeorgeF." <av8tor at flash.net> 
        Sent by: discussion-request at nsrca.org 
        03/21/2003 08:30 AM 
        Please respond to discussion 

               
                To:        discussion at nsrca.org 
                cc:         
                Subject:        Re: Focus Canopy Painting 




  >
  >
  >Trust me, if you paint it black and set it out in the sun it will get HOT, 
  >some plastics may handle it better than others, but it will get hot, I'll 
  >bet so hot you can't touch it.  I've done it and got away with it, but 
  >I've also seen them melt/deform so be careful.  The shame of it is that I 
  >like the looks of a black canopy, both on the ground and in the air, but 
  >having seen a couple deform I've decided against black.  Ya' paints yer' 
  >canopy and ya' takes yer' chances.



  Not sure what the thickness of the plastics used were or if they were being 
  painted on the inside or outside but mine did NOT get hot to the touch.

  Mine were painted on the inside, possibly the fact the sun rays need to go 
  through the plastic before hitting the black may deflect the rays causing 
  them to hit at an angle other than 90 degrees.  This deflection will reduce 
  heat build up.  But I've done about 12 or so planes that way, they've set 
  in full sunlight on 90 degree days and have yet to have one deform in 
  anyway....

  George

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