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Transparencies

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ron.mcgann(at)baesystems.
Guest

Posted: Tue Mar 13, 2007 2:14 pm Post subject: Transparencies

G'day all,   

I would be interested in hearing opinions about the optimum shop temperature for glueing the transparenices.  I believe it is wise to cut/drill/work plexi while the shop temperature is fairly warm. The recent weather in South Oz has topped 40deg C, and I have had NO trouble trimming the windscreen and side windows.  The higher temperature clearly makes the plexi more flexible/pliable.  

I was wondering whether there is a down side to installing the transparencies when it is too hot - other than the adhesive going off too quickly.  

Because the plexi will be very flexible, it could be possible to install the transparency with a warp or twist (eg not enough has been trimmed and it can be forced into the recess.)  When the temperature drops, the plexi will tend to its original formed shape and introduce stress in both the plexi and the joint.  Consequences are obvious.  

I guess an advantage of glueing in the hotter temperatures is that the plexi has expanded and should be a better fit to the recess.  If glued in cold weather the plexi would expand in the heat with the potential to 'pop out' of the recess.  

Not a big issue for sure.  But as others have said - 'enquiring minds need to know'.  Would it be better to wait for some cooler weather before glueing the transparencies?  

In writing this, it occurs that the same question could be asked of glueing/fitting the doors - jeez my head hurts    

Cheers,  

Ron  

187 finishing     [quote][b]

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indigoonlatigo(at)msn.com
Guest

Posted: Tue Mar 13, 2007 4:20 pm Post subject: Transparencies

For all the reasons that you mention, I would plan on glueing these in when 

the temperature is the most similair to the temperature that the plane will 

be spending most of its time in. The plexiglass really expands in the warm 

weather...a lot!.



Consider summer temperatures vs winter temperatures in your area and whether 

the plane will be in a hanger or outside in the sun.



My experience is based on my sailplane plexiglass canopy which is atleast 

four feet long. It can be way over 110 degrees F while flying low or on the 

ground and below freezing at 18K even on the same say in the summer months.



Oh, one more thing to consider, things will be getting hotter regardless of 

how much weight Al Gore has put on or how much he is not practicing what he 

preaches. Saying no, don't make it so.



After all, I hope I am wrong...rather error on the cautious side. Then again 

Ron, maybe the temperatures you are experiencing are the new average 

temperature for your area.



John G.



93 degrees F in Los Angeles in March, Santa Ana winds should have stopped 

two months ago and almost no rain this year.

 	  Quote: 	
		  From: "McGANN, Ron" <ron.mcgann(at)baesystems.com>

Reply-To: rv10-list(at)matronics.com

To: <rv10-list(at)matronics.com>

Subject: Transparencies

Date: Wed, 14 Mar 2007 08:43:15 +1030



G'day all,



I would be interested in hearing opinions about the optimum shop

temperature for glueing the transparenices.  I believe it is wise to

cut/drill/work plexi while the shop temperature is fairly warm. The

recent weather in South Oz has topped 40deg C, and I have had NO trouble

trimming the windscreen and side windows.  The higher temperature

clearly makes the plexi more flexible/pliable.



I was wondering whether there is a down side to installing the

transparencies when it is too hot - other than the adhesive going off

too quickly.



Because the plexi will be very flexible, it could be possible to install

the transparency with a warp or twist (eg not enough has been trimmed

and it can be forced into the recess.)  When the temperature drops, the

plexi will tend to its original formed shape and introduce stress in

both the plexi and the joint.  Consequences are obvious.



I guess an advantage of glueing in the hotter temperatures is that the

plexi has expanded and should be a better fit to the recess.  If glued

in cold weather the plexi would expand in the heat with the potential to

'pop out' of the recess.



Not a big issue for sure.  But as others have said - 'enquiring minds

need to know'.  Would it be better to wait for some cooler weather

before glueing the transparencies?



In writing this, it occurs that the same question could be asked of

glueing/fitting the doors - jeez my head hurts 



Cheers,

Ron

187 finishing

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ron.mcgann(at)baesystems.
Guest

Posted: Tue Mar 13, 2007 4:42 pm Post subject: Transparencies

Thanks John, I like your logic.  With a max temp of 45-50C (outside on

hardstand) and min temp of say -20C (at) 15K feet, a good bet is 15-20C

(60-70F).  Probably close to what everyone would have done anyway, but

I'll need to wait for the wx to cool down a tad.



Cheers,

Ron   



--

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