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Old 05-15-2009 | 02:31 PM
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Rodney
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Default RE: Thrust line, Datum line, Center line?

Datum Line, Reference Line, water line: different names for the same line. Old school draftsmen use the term "Water Line", a carry over from when ocean going ships were the main form of transportation. The aircraft company I worked in for so many years used the term "water line" on all their aircraft.