Return-Path: Sender: (Marvin Kaye) To: lml@lancaironline.net Date: Tue, 10 Aug 2004 11:16:52 -0400 Message-ID: X-Original-Return-Path: Received: from imo-d05.mx.aol.com ([205.188.157.37] verified) by logan.com (CommuniGate Pro SMTP 4.2) with ESMTP id 359364 for lml@lancaironline.net; Tue, 10 Aug 2004 10:42:25 -0400 Received-SPF: pass receiver=logan.com; client-ip=205.188.157.37; envelope-from=Newlan2dl@aol.com Received: from Newlan2dl@aol.com by imo-d05.mx.aol.com (mail_out_v37_r3.4.) id q.110.359ef3c2 (4206) for ; Tue, 10 Aug 2004 10:41:53 -0400 (EDT) From: Newlan2dl@aol.com X-Original-Message-ID: <110.359ef3c2.2e4a38b1@aol.com> X-Original-Date: Tue, 10 Aug 2004 10:41:53 EDT Subject: Re: [LML] LNC2 Canopy Stiffening Question X-Original-To: lml@lancaironline.net MIME-Version: 1.0 Content-Type: multipart/alternative; boundary="-----------------------------1092148913" X-Mailer: 9.0 for Windows sub 5032 -------------------------------1092148913 Content-Type: text/plain; charset="US-ASCII" Content-Transfer-Encoding: 7bit Hello Kai For efficiency, a "hat section" beam like you are talking about is best done with a uni cap and then a biaxial weave over the top. Since stiffness increases by the cube of the thickness from the neutral axis, a slight increase in the height of the foam stiffener will make a HUGE difference in stiffness. Carbon uni even in the most basic material (33 million modulus) is 3 times more resistant to stretch than E glass. I also have "S" glass uni and Kevlar uni plus Kevlar/carbon hybrid weave, some standard weave and 5 harness satin weave, etc. If you need some carbon uni, I have some in 4.75 oz/sq. yd, 9.0 and several other denominations. Mostly it is 33 million modulus carbon and also mostly in 12" width but I do have some 1" tape uni and some 24". I also have some Hercules IM-6 uni at 45 million modulus and about 650 ksi tensile if I remember correctly so it is roughly 30" stronger and stiffer. Also, it is better to use a higher grade of epoxy than Jeffco or WEST system. You may have heard my preaching about toughened epoxies but they are a lot better for advanced composites in just about every way. Applied Poleramic is my source, they are in Benicia, California. Send me an email if you are intersted in some uni and let me know how much. Dan Newland -------------------------------1092148913 Content-Type: text/html; charset="US-ASCII" Content-Transfer-Encoding: quoted-printable

Hello Kai

For efficiency, a "hat section" beam like you are talking about is best= done with a uni cap and then a biaxial weave over the top. Since stif= fness increases by the cube of the thickness from the neutral axis, a slight= increase in the height of the foam stiffener will make a HUGE difference in= stiffness. Carbon uni even in the most basic material (33 million mod= ulus) is 3 times more resistant to stretch than E glass. I also have "= S" glass uni and Kevlar uni plus Kevlar/carbon hybrid weave, some standard w= eave and 5 harness satin weave, etc.

If you need some carbon uni, I have some in 4.75 oz/sq. yd, 9.0 and sev= eral other denominations. Mostly it is 33 million modulus carbon and a= lso mostly in 12" width but I do have some 1" tape uni and some 24". I= also have some Hercules IM-6 uni at 45 million modulus and about 650 k= si tensile if I remember correctly so it is roughly 30" stronger and stiffer= . Also, it is better to use a higher grade of epoxy than Jeffco o= r WEST system. You may have heard my preaching about toughened epoxies= but they are a lot better for advanced composites in just about every way.&= nbsp; Applied Poleramic is my source, they are in Benicia, California.

Send me an email if you are intersted in some uni and let me know how m= uch.

Dan Newland

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