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Message: <blockquote data-quote="Dave70968" data-source="post: 3170843" data-attributes="member: 13624">While a student at OU, I had the pleasure of visiting with Dr. Karl Bergey, former chief engineer at Piper Aircraft.  We got to taking about the trim system for the Cherokee--which is a very clever and simple system, with a minimum of moving parts--and he told me how it came to be.  The part in question was designed by a junior engineer.  The engineer drew it and showed it to the senior engineers, who promptly said it couldn't be made.What they didn't know is that before E-school, he had been a machinist.  That night, after everybody had gone home, he went out to the shop and made several copies.  Come the next morning, he handed a copy to each of the engineers who said it couldn't be made.That part still exists in Piper Cherokees and their descendants.</blockquote>