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madriver(at)wildblue.net
Guest

Posted: Wed Apr 08, 2009 6:21 pm Post subject: Top window

Hy guys and Gals,

  

 Getting ready to install the top window in my 701 - since it's hot and sunny here in Idaho I've been thinking of "treating" the plexiglass with a film of reflecting window coating such as the mylar material  found in the local big box hardware stores.

   

 Anyone done this - what are your thoughts - all I remember is riding around in a car with a sun roof and getting the top of my head burned on a sunny day.

  

 Thanks

  

 Phil.

  [quote][b]

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Tommy Walker

Joined: 12 Jan 2006
Posts: 442
Location: Anniston, AL 36207

Posted: Thu Apr 09, 2009 3:32 am Post subject: Re: Top window

Hi Philip,



I'll wager it is hotter and sunnier here in Alabama.  We considered adding some type of sun screen to the top window, but never did.  The window is  slightly tinted anyway, so we just went with that.  



It never seemed to be a problem.



We always wore hats.



Tommy Walker in Alabama

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Tommy Walker
N25A - Anniston, AL

zsmith3rd(at)earthlink.ne
Guest

Posted: Thu Apr 09, 2009 4:11 am Post subject: top window

do not archive



Several yeas ago somebody suggested that the top window be totally fitted,clecoed, etc, BEFORE working on the piece which makes the window bow upward.  (Don't have plans at hand, no part number for reference).

Anyway, the idea being that the "curved" piece needs to apply a slight amount of upward pressure against the underside of the top window, and that attaching it last allowed the builder to position this piece as needed to achieve the desired result.  

As I recall, whoever suggested this explained that the curved piece, in his case, had a narrow strip of felt glued to the top, making contact with the bottom of the window.

Seems that the Lister also mentioned he had seen others without any actual upward pressure, and they "fluttered" somewhat at various speeds, which dinged the window.



You results may differ.



Regards to all,



Zed/701/912/90%, etc

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bobkat

Joined: 07 Sep 2008
Posts: 143
Location: Bismarck, ND

Posted: Thu Apr 09, 2009 5:06 am Post subject: top window

While flying it would bow outwards with the gigantic suction on the top of 

the cabin.  I was worried it would be sucked right off!

Then I put a strip of cork on the underside of the plexiglass along the 

diagonal brace and then glued it down to the diagonal brace with a strip of 

silicone and its fine, now.  Doesn't move.

---

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ronlee

Joined: 25 Dec 2006
Posts: 141

Posted: Thu Apr 09, 2009 5:45 am Post subject: Re: Top window

I live in southern Arizona and it is very sunny here and hot too. I put limousine tint (very dark) on the inside of my roof panel to keep from baking. It was like a solar oven in there. If I had to do it again the top would be all aluminum with maybe a small window that could be covered easily from the inside when sunny. 

My thought was that the plastic in a solid frame needed some room to move so it wouldn't crack. I made the holes in the plastic a little bigger then the screws shank.  I did drill, tap and screw my Lexan down instead of rivet it, that way I could control how much to tighten the screws. I put Locktite on the threads and silicone under the heads of the #6 screws to keep the not real tight screws from turning and to keep the water out.  One other thing to think about is the fact that that part of the cabin creates lift when in flight. I can stick my finger between the cross bow and the plastic when in flight yet it is tight to the cross bow when on the ground. This makes me think it needs to be attached quite well.

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Ron Lee
Tucson, Arizona

bobkat

Joined: 07 Sep 2008
Posts: 143
Location: Bismarck, ND

Posted: Thu Apr 09, 2009 8:41 am Post subject: Top window

Yes, it was the bowing out in flight that bothered me.  I was worried that 

sooner or later there'd be a pop and swoosh and it would break and depart. 

That's why I fastened it to the cross tube.   Maybe not necessary, but I 

relax better now.

---

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