FWIW - The Lockheed 749 Constellation with "jet-stack" (short) exhaust pipes actually "...added 15 mph at the maximum cruising speed..." (*) from exiting exhaust gases!
(*) see page 53, C.K. Stringfellow & P.M. Bowers, Lockheed Constellation, 1992, MBI Publications.
Last edited by gone-ot; 11-18-2015 at 10:00 PM..
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