X-Virus-Scanned: clean according to Sophos on Logan.com Return-Path: Sender: To: lml@lancaironline.net Date: Tue, 25 Feb 2014 11:34:51 -0500 Message-ID: X-Original-Return-Path: Received: from outbound-jr1.exchangedefender.com ([65.99.255.228] verified) by logan.com (CommuniGate Pro SMTP 6.0.8) with ESMTPS id 6748514 for lml@lancaironline.net; Tue, 25 Feb 2014 09:35:28 -0500 Received-SPF: pass receiver=logan.com; client-ip=65.99.255.228; envelope-from=cberland@systems3.net Received: from remote.systems3.net (wsip-98-172-79-178.ph.ph.cox.net [98.172.79.178]) by outbound-jr1.exchangedefender.com (8.13.8/8.13.8) with ESMTP id s1PEYmH5032073 (version=TLSv1/SSLv3 cipher=AES128-SHA bits=128 verify=FAIL) for ; Tue, 25 Feb 2014 09:34:48 -0500 Received: from S3SBS11SERVER.Systems3.local ([fe80::5ce0:47a:d104:b76]) by S3SBS11SERVER.Systems3.local ([fe80::5ce0:47a:d104:b76%11]) with mapi id 14.01.0438.000; Tue, 25 Feb 2014 07:34:43 -0700 From: Craig Berland X-Original-To: Lancair Mailing List Subject: [LML] Am considering purchasing a used composite aircraft Thread-Topic: [LML] Am considering purchasing a used composite aircraft Thread-Index: AQHPMiWrPhHxB4lBjkiS2K6qmlqOyJrGBYiw X-Original-Date: Tue, 25 Feb 2014 14:34:43 +0000 X-Original-Message-ID: <03ED6C7C51EFA9489CA3844E6F7B667632D0D32A@S3SBS11SERVER.Systems3.local> References: In-Reply-To: Accept-Language: en-US Content-Language: en-US X-MS-Has-Attach: X-MS-TNEF-Correlator: x-originating-ip: [192.168.16.36] Content-Type: multipart/alternative; boundary="_000_03ED6C7C51EFA9489CA3844E6F7B667632D0D32AS3SBS11SERVERSy_" MIME-Version: 1.0 X-ExchangeDefender-Info: Please contact the ISP for more information X-ExchangeDefender-VirusScan: Found to be clean X-ExchangeDefender-From: cberland@systems3.net X-ExchangeDefender-MagicKey: 1394548491.50593@728rhniA8qm7PJh7Vfv83g X-Spam-Status: No --_000_03ED6C7C51EFA9489CA3844E6F7B667632D0D32AS3SBS11SERVERSy_ Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: quoted-printable Foolproof? Stress it to 8 g's and fly it below 4 g's. Not so foolproof....Quarter drop test. Take a quarter and hold it between = your thumb and forefinger from about 3-4 inches above your target. Drop it= on the composite surface. If it bounces the bond joint is OK. If it doesn= 't bounce as well, there is a poor bond or delamination. Once you get the= hang of it you can drop and catch the quarter repeatedly and quickly. You= will be able to identify where ribs are using this technique. Follow a rib= looking for a poor bond. Craig Berland N7VG Does anyone know of foolproof tests to determine whether a composite has su= ffered impact or thermal damage? Mikell Becker --_000_03ED6C7C51EFA9489CA3844E6F7B667632D0D32AS3SBS11SERVERSy_ Content-Type: text/html; charset="us-ascii" Content-Transfer-Encoding: quoted-printable

Foolproof?  Stres= s it to 8 g’s and fly it below 4 g’s.

Not so foolproof…= ;.Quarter drop test.  Take a quarter and hold it between your thumb an= d forefinger from about 3-4 inches above your target.  Drop it on the = composite surface.  If it bounces the bond joint is OK. If it doesn’t bounce as well, there is a  poor bond or dela= mination.  Once you get the hang of it you can drop and catch the quar= ter repeatedly and quickly.  You will be able to identify where ribs a= re using this technique. Follow a rib looking for a  poor bond.

Craig Berland

N7VG=

 

Does anyone know of foolproof tests to de= termine whether a composite has suffered impact or thermal damage?

Mikell Becker

 




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