----[Please read http://ercoupers.com/disclaimer.htm before following any advice in this forum.]----
Thanks for the clarification, Larry. I was referring to the hard-coated Lexan for scratch resistance. Does the coating also provide the UV resistance to keep it from yellowing? >>-----Original Message----- >>From: Larry Wilkins [mailto:[EMAIL PROTECTED] >>Sent: Wednesday, October 17, 2001 3:46 PM >>To: [EMAIL PROTECTED] >>Subject: Re: FW: [COUPERS] window installation >> >> >>It is a good idea to use Lexan in place of the Plexiglas. It >>is however, not harder than Plexiglas. >>Lexan is quite soft. It can be made harder by coating it >>with a super hard surface. That's what they >>do with safety glasses. You get the incredible toughness of >>the Lexan, with the scratch resistance of >>the hard coating. Most Lexan that you can buy will not have >>the hard coat. Thus it will scratch easier >>than the Plexiglas. In addition, most lexan that you can buy >>is not UV resistant. It will turn yellow >>over time with exposure to the sun. Plexiglas is naturally >>UV resistant, much the same as glass is. As >>you can see, it's a crap shoot. Both materials have good >>properties. Both have bad. In general, Lexan >>will be much easier to work with, and you'll have much less >>chance of breaking it. Plexiglas is hard to >>work with, but if you do finally get it installed, it will >>look good longer, barring any breakage. I >>believe you have it backwards on the bending problem. Do not >>attempt to bend the Plexiglas. It will >>snap with little pressure. The only way to bend it is to >>have it bent using a heated bending bar. >>Lexan will bend, and I doubt you can break it by bending it. >>It most likely will not hold the bend that >>you want without using the same heat-bending process as the Plexi. >> >>Larry >> >>Larry >> >>"Thompson, Doug" wrote: >> >>> ----[Please read http://ercoupers.com/disclaimer.htm before >>following any advice in this forum.]---- >>> >>> Subject: RE: [COUPERS] window installation >>> >>> Another suggestion, you may want to use Lexan in place of >>the plexiglass. >>> It has a harder surface (more scratch resistant) and does >>not crack near as >>> easily as Plexiglass. When cutting, use a saber saw with >>orbital action or >>> the "cut" will try to weld itself back together due to the >>heat generated by >>> the friction of the saw blade. A nice way to finish the >>edges and to help >>> reduce the chance of cracks in the future is to "touch" the >>edges with the a >>> propane torch flame. Just keep it moving and you'll see >>the filed edge >>> (finished as David describes below) go from white to clear. >>> >>> Bending Lexan is a little more of a challenge than >>Plexiglass because it is >>> MUCH tougher. You have to use heat. The upside is that >>you probably will >>> not crack the Lexan when drilling or inserting rivets/screws though. >>> >>> >>-----Original Message----- >>> >>From: david abrams [mailto:[EMAIL PROTECTED] >>> >>Sent: Wednesday, October 17, 2001 7:21 AM >>> >>To: [EMAIL PROTECTED] >>> >>Subject: RE: [COUPERS] window installation >>> >> >>> >> >>> >>----[Please read http://ercoupers.com/disclaimer.htm before >>> >>following any advice in this forum.]---- >>> >> >>> >>tom woodward wrote: >>> >>> >>> >>> A new piece of plastic.......... about $42 >>> >>> A sunshade with frames........about $90+ >>> >>> The ability to do something right the first >>time.......PRICELESS!!! >>> >>> >>> >>> Any ideas? >>> >>> 2152H >>> >> >>> >> >>> >>Tom, >>> >> >>> >>I replaced my side windows in Sep 1998. As owner, not >>only are you >>> >>allowed to replace the windows yourself, but you can >>manufacture your >>> >>own parts. I signed this all off in my airplane logs >>using my pilot >>> >>certificate number and the relevant FAR's referenced. >>> >> >>> >>I had window blanks cut to size by my local plastic dealer. >>> >>I used the >>> >>dimensions on the ercoupe microfilm drawing fro Bowling Green >>> >>University. The invoice from "Plastics Etc, Inc" shows: >>> >> >>> >>5 pcs (I am a bit paranoid<g>) Acrylic Sheet 0.060 x 19.75 x 31.75 >>> >> >>> >>I paid $9.40 each blank. I used an orbital hand sander >>with 200 grit >>> >>paper to round the edges of the plastic blank as shown on >>the drawing >>> >> >>> >>I reused the window hardware that was in acceptable shape, >>> >>ordered new >>> >>hardware for the top frames that had worn to a razor edge, >>> >>and made new >>> >>handles from "L" stock because the ones I ordered from >>Skyport were >>> >>poorly made. I ordered a set of plexiglas drill bits from LP >>> >>Plastics. >>> >>I followed the Ercoupe microfilm drawings to drill the holes >>> >>and rivet >>> >>the frame hardware. Warning! The rivets on the sides may >>> >>appear to be >>> >>way far in to the middle of the window but this is to clear >>> >>the welts. >>> >>I used a hand compression rivet tool. >>> >> >>> >>It really is not too hard a job. I also replaced my rear >>> >>windows using >>> >>rectangular blanks of 0.060 x 18.00 x 21.00 I used a bench >>> >>band saw and >>> >>a fine blade to cut them to shape using the old windows as a >>> >>pattern. I >>> >>ordered new hardware and used Mortite as the sealing >>> >>material. (It is a >>> >>modeling clay type gray material used to seal windows in >>the winter >>> >>around here). Be careful not to overtighten, I cracked one >>> >>window and >>> >>had to replace it after almost being done. I used a >>wallpaper seam >>> >>sealer roller to roll down the mortite before installing >>the window. >>> >> >>> >>The flat windshield can also be made from flat stock (.100 >>> >>from memory >>> >>but I could be wrong) for less than $10 but you need an A&P >>> >>to supervise >>> >>and sign off to be legal. Note that the $10 blank cut to >>shape using >>> >>the old windshield will be a much better fit than the >>$120 blank from >>> >>Univair as each windshield appears to be trimmed to fit and the >>> >>purchased blank is cut to a universal pattern. >>> >> >>> >>David Abrams >>> >>http://ercoupe.com >>> >> >>> >> >>> >> ==^================================================================ EASY UNSUBSCRIBE click here: http://topica.com/u/?aVxiLm.aVzvvT Or send an email To: [EMAIL PROTECTED] This email was sent to: [EMAIL PROTECTED] T O P I C A -- Register now to manage your mail! http://www.topica.com/partner/tag02/register ==^================================================================
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