As hattifattener says, it must have been in the Estes manuals. It seems to date from 1935 as an aeronautical term, "a fairing at the junction of two surfaces to improve the air-flow". This seems derived from the use, to 1779, in carpentry: "A narrow strip of wood fastened upon any surface to serve as a support, etc. or to strengthen an angle formed by two surfaces."
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timeasmymeasure
no subject
Date: 2004-04-06 03:31 pm (UTC)The perfect fillet should have a radius of 4 to 8 percent of the fin root chord.