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701 windshield

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zsmith3rd(at)earthlink.ne
Guest

Posted: Thu Jun 08, 2006 9:24 am Post subject: 701 windshield

Yes to all the above......



If ZAC supplied the "trim washers" (chrome thingys) you will also have some screws that resemble wood screws.



I do not recall exactly how big I made the holes in the Plexiglas, but you would want to first drill 1/8" holes, use a Cleco in some holes to keep things straight as you fit & trim.....only AFTER everything fits would you enlarge the holes.  Think mine ended up being 1/4" or maybe larger; slept since that part of the project.



At any rate, the holes will accomodate the screw, the tubing cushion, and allow for some slight bit of space.

Another fellow advised to "center" all the screws within the Plexiglas holes so as not to have the windshield in a bind against one corner, etc.  Again, get it to fit properly with only the 1/8" holes & Clecos before enlarging.

Pay close attention to dressing the inside of the final holes.  You can tightly roll a piece of very fine abrasive paper and sand inside.



Another builder told me he used some sort of synthetic rubber pad under the washers and under the windshield at each hole to prevent chafing.  Said the pads were rubbery heat sink pads which were intended to go under power transistors.  Trimmed them into circles with a hollow punch.



Regards,



Zed/701/R912/90+%/etc/do not archive

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planejim(at)bellsouth.net
Guest

Posted: Thu Jun 08, 2006 9:44 am Post subject: 701 windshield

List,



I agree with all that Zed said. I'll add, be carefull to not over tighten 

the screws. Better loose than too tight. Check them with a screwdriver 

occasionally. I didn't use rubber under the screw heads, but did use the 

rubber inserts in the polished hole in the Lexan. 515 hours on my 601HD 

canopy and no cracks - YET.



Jim Hoak

---

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Geoff Heap

Joined: 12 Jan 2006
Posts: 266
Location: Lindenwold, New Jersey

Posted: Thu Jun 08, 2006 1:19 pm Post subject: Re: 701 windshield

Thanks for the info Zed. It fits with what Johann and Larry answered in their replies to my post. I did get the chrome thingies and wood screws  Where do I get more. Anyone know?

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larry(at)macsmachine.com
Guest

Posted: Thu Jun 08, 2006 4:53 pm Post subject: 701 windshield

Geoff,

The washers are 100-deg recess head or low profile washers sized 6 or 8 

as you need.

The screws are phillips head 100-degree sheet metal screws sized to match.

See Aircraft Spruce catalog page 98. 2005 issue.



Larry McFarland - 601HDS at www.macsmachine.com

do not archive



Geoff Heap wrote:



 	  Quote: 	
		  



Thanks for the info Zed. It fits with what Johann and Larry answered in their replies to my post. I did get the chrome thingies and wood screws  Where do I get more. Anyone know?





Read this topic online here:



http://forums.matronics.com/viewtopic.php?p=39434#39434

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goodings(at)yorku.ca
Guest

Posted: Fri Jun 09, 2006 5:35 am Post subject: 701 Windshield

 	  Quote: 	
		  From experience, I agree with the other posts about the screws through the

lucite/perspex/acrylic plastic or polycarbonate.  Let me add just a couple
	


of things.  Make sure the cup washers are stainless steel or nickel-plated

brass.  The screws should be stainless steel (or they leave a rust streak

after a while); I got them at Home Hardware, the finer the thread the

better, because the steel tubing frame is thin.  An O-ring works very well

under the cup washer.  Use a bushing around the screw so it does not

contact the plastic. BUT make the holes oversize as has been stated.  It

was put to me by an experienced builder to surround each hole "with a

layer of air"!  You need some room for expansion/contraction.  Our

temperature extremes in Canada are considerable.  Finish each hole through

the plastic with rolled up very fine sandpaper so the hole edge is very

smooth.  I have had no cracks in 3 years plus.



John Goodings, C-FGPJ, CH601HD with R912S, Toronto/Waterloo.

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