Return-Path: Sender: (Marvin Kaye) To: lml Date: Tue, 18 Feb 2003 01:18:12 -0500 Message-ID: X-Original-Return-Path: Received: from mailnw.centurytel.net ([209.206.160.237] verified) by logan.com (CommuniGate Pro SMTP 4.0.6) with ESMTP id 2026648 for lml@lancaironline.net; Mon, 17 Feb 2003 22:03:50 -0500 Received: from cty07624 (pppoe1608.gh.centurytel.net [64.91.50.122]) by mailnw.centurytel.net (8.12.7/8.12.7) with SMTP id h1I33nqv020717 for ; Mon, 17 Feb 2003 19:03:49 -0800 (PST) X-Original-Message-ID: <002601c2d6f1$50be33e0$3e4ffea9@centurytel.net> From: "Robert Smiley" X-Original-To: "Lancair Mailing List" References: Subject: Re: [LML] LNC2 cowl stiffening X-Original-Date: Mon, 17 Feb 2003 18:59:04 -0700 MIME-Version: 1.0 Content-Type: multipart/alternative; boundary="----=_NextPart_000_0023_01C2D6B6.A4256020" X-Priority: 3 X-MSMail-Priority: Normal X-Mailer: Microsoft Outlook Express 6.00.2800.1106 X-MimeOLE: Produced By Microsoft MimeOLE V6.00.2800.1106 This is a multi-part message in MIME format. ------=_NextPart_000_0023_01C2D6B6.A4256020 Content-Type: text/plain; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable Install two aluminum brackets from the firewall down to the rear of the = lower cowl and fasten to the lower cowl with flat head or tapered = screws. Also install additional graphite or glass bid near the seam joint = between the air intake holes and the prop shaft hole. I have done so = and do not have spider cracks often seen on other cowlings. Run the = glass about three inches above and below the cowling seam line. If you use piano hinge and rivit same to the upper and lower cowling; = use one bid of standard weight glass bid over the rivets to eliminate = their eventual paint cracking around the rivet. I used very lightweight = glass used for model airplanes and it was too light.=20 I had some hanger rash on the cowling. To fix it I stoppped drilled the = cracks,placed two bid under, two bid over and tapered and body work. = After three years those spider cracks reappeared. I have heard you need = to grind those cracks out and fill with flox or other method prior to = patching as stated above. Perhaps someone with more direct knowlege = about this subject can enlighten us. Gel coat is a pain. If I had my rathers I would like to work with = straight glass. Reinforce the top cowl to give it more rigidity. The top side does flex = and eventually might sag with constant heating and cooling. place a foam = strip maybe 1/2 or 5/8 thick by about 1 1/2 inch wide with rounded = corners from front to rear and cover it with a two bid glass bonded one = inch on each side of the foam. This beam should be strong enough to = support the top cowl and suppress drumming. I covered the inside with = two ply graphite. It was heavy and may be more than necessary. =20 =20 Bob Smiley N94RJ ------=_NextPart_000_0023_01C2D6B6.A4256020 Content-Type: text/html; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable
Install two aluminum brackets from the = firewall=20 down to the rear of the lower cowl and fasten to the lower  cowl = with flat=20 head or tapered screws.
 
Also install additional graphite or = glass=20 bid near the seam joint between the air intake holes and the prop = shaft=20 hole.  I have done so and do not have spider cracks often seen on = other=20 cowlings.  Run the glass about three inches above and below the = cowling=20 seam line.
 
If you use piano hinge and rivit same = to the upper=20 and lower cowling; use one bid of standard weight glass bid over the = rivets to=20 eliminate their eventual paint cracking around the rivet. I used very=20 lightweight glass used for model airplanes and it was too light. =
 
I had some hanger rash on the = cowling.  To fix=20 it I stoppped drilled the cracks,placed two bid under, two bid over and = tapered=20 and body work. After three years those spider cracks reappeared. I have = heard=20 you need to grind those cracks out and fill with flox or other method = prior to=20 patching as stated above.  Perhaps someone with more direct = knowlege about=20 this subject can enlighten us.
 
Gel coat is a pain.  If I had my = rathers I=20 would like to work with straight glass.
 
Reinforce the top cowl to give it more=20 rigidity.  The top side does flex and eventually might sag with=20 constant heating and cooling. place a foam strip maybe 1/2 or 5/8 = thick by=20 about 1 1/2 inch wide  with rounded corners from front to rear and = cover it=20 with a two bid glass bonded one inch on each side of the = foam.  This=20 beam should be strong enough to support the top cowl and suppress=20 drumming.  I covered the inside with two ply graphite.  It was = heavy=20 and may be more than necessary.  
 
Bob Smiley
N94RJ
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