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----[Please read http://ercoupers.com/disclaimer.htm before following any advice in this forum.]----
In 1981, I had my wings tested by a licensed A&P idiot who didn't know about the non-destructive testing device or didn't bother to buy one or he used the non-destructive tester in a destructive way from ignorance. He poked holes in my wings for no good reason even though they were in the green. Boy, did that idiot ever get a hate-filled report to his boss! Ed Burkhead N3802H, Ercoupe 415-D Peoria, IL -----Original Message----- From: Paul Anton [mailto:[EMAIL PROTECTED] Sent: Sunday, July 15, 2001 11:36 AM To: ERCOUPE Subject: Re: [COUPERS] Punch test ----[Please read http://ercoupers.com/disclaimer.htm before following any advice in this forum.]---- > Just for those of us unitiated, could someone please explain what a "punch test" Fabric is allowed to deteriorate to a minimum strength. As an example, the original Grade A cotton was manufactured to a minimum strength of 80 lbs. per square inch. It was allowed to deteriorate to 56 lbs. per square inch before replacement is required. In order to test it, a Seyboth "punch tester" (SP?) was used. This was an instrument with a sharp spring loaded plunger that was put against the fabric. The punch made a hole in the fabric and the end of the spring loaded plunger projected out of the body of the tester. This end had a series of bands colored red, yellow, green. The stronger the fabric the further the plunger was held out of the body of the tester. If it sunk too far in, the red band showed, if the fabric was real strong, the green, etc.
