Return-Path: Sender: "Marvin Kaye" To: lml@lancaironline.net Date: Wed, 03 Nov 2004 03:17:54 -0500 Message-ID: X-Original-Return-Path: Received: from imo-d20.mx.aol.com ([205.188.139.136] verified) by logan.com (CommuniGate Pro SMTP 4.2.5) with ESMTP id 496796 for lml@lancaironline.net; Wed, 03 Nov 2004 01:17:34 -0500 Received-SPF: pass receiver=logan.com; client-ip=205.188.139.136; envelope-from=Newlan2dl@aol.com Received: from Newlan2dl@aol.com by imo-d20.mx.aol.com (mail_out_v37_r3.8.) id q.158.42c6c6de (4459) for ; Wed, 3 Nov 2004 01:17:02 -0500 (EST) From: Newlan2dl@aol.com X-Original-Message-ID: <158.42c6c6de.2eb9d1de@aol.com> X-Original-Date: Wed, 3 Nov 2004 01:17:02 EST Subject: carbon laminate conductance X-Original-To: lml@lancaironline.net MIME-Version: 1.0 Content-Type: multipart/alternative; boundary="-----------------------------1099462622" X-Mailer: 9.0 for Windows sub 5035 -------------------------------1099462622 Content-Type: text/plain; charset="US-ASCII" Content-Transfer-Encoding: 7bit There was a question from someone about carbon static wick conductance and I said I'd check my records. I did some tests awhile back but didn't find my old notes, however I did repeat some tests of two coupons I had laminated previously. This lights up my life which is a sad testament to what I enjoy, but I digress. Here are the numbers: Test conditions: Derakane 8084 toughened vinylester resin for both specimens Laminates are 10 layers of unidirectional carbon .033 lbs/sq. ft. dry, 33 million modulus measurements taken from #8 self tapping SMS through laminate except for 90 degree surface measurement which is taken from sanded carbon surface screw pattern: 4" x 4" Specimen #1, vacuum bagged laminate molded to plate glass surface finished weight, .618 lb/sq. ft thickness .089"-.102" resistance at: 0 degrees 6.1 Ohms 90 degrees 19.3 Ohms 45 degrees 21.3 Ohms 90 degree surface measurement: 96-200 Ohms (open surface side) Specimen #2, Open layup carbon, squeegeed finish on top, molded to plate glass surface finished weight: .80 lbs/sq. ft. thickness .125" - .160" (Note: much more texture since fibers were free to lift on open side) resistance at: 0 degrees: 15.2 Ohms 90 degrees 208 Ohms 45 degrees 168 Ohms 90 degree surface measurement: 670-1800 (open surface side) 90 degree surface measurement: 700-6000 Ohm (mold surface side, lots of bouncing up and down on readings) As you can see, the conductance is pretty good. I will try to find my previous tests of the hull laminate readings or at least repeat the readings from the boat which is more realistic since the laminate is in three different directions. These will be from the inner skin. I'll post them later. Dan Newland -------------------------------1099462622 Content-Type: text/html; charset="US-ASCII" Content-Transfer-Encoding: quoted-printable

There was a question from someone about carbon static wick conductance=20= and I said I'd check my records. I did some tests awhile back but didn= 't find my old notes, however I did repeat some tests of two coupons I had l= aminated previously. This lights up my life which is a sad testament t= o what I enjoy, but I digress. Here are the numbers:

Test conditions:

Derakane 8084 toughened vinylester resin for both specimens

Laminates are 10 layers of unidirectional carbon .033 lbs/sq. ft. dry,=20= 33 million modulus

measurements taken from #8 self tapping SMS through laminate except for= 90 degree surface measurement which is taken from sanded carbon surface

screw pattern: 4" x 4"

Specimen #1, vacuum bagged laminate molded to plate glass surface<= /DIV>

finished weight, .618 lb/sq. ft

thickness .089"-.102"

resistance at:

0 degrees 6.1 Ohms

90 degrees 19.3 Ohms

45 degrees 21.3 Ohms

90 degree surface measurement: 96-200 Ohms = (open surface side)

Specimen #2, Open layup carbon, squeegeed finish on top, molded to plat= e glass surface

finished weight: .80 lbs/sq. ft.

thickness .125" - .160" (Note: much more texture since fibers were free= to lift on open side)

resistance at:

0 degrees: 15.2 Ohms

90 degrees 208 Ohms

45 degrees 168 Ohms

90 degree surface measurement: 670-1800 (open surface= side)

90 degree surface measurement: 700-6000 Ohm (mo= ld surface side, lots of bouncing up and down on readings)

As you can see, the conductance is pretty good. I will try to fin= d my previous tests of the hull laminate readings or at least repeat the rea= dings from the boat which is more realistic since the laminate is in three d= ifferent directions. These will be from the inner skin. I'll pos= t them later.

Dan Newland

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