>As I recall, and you can read Mark's site for clarification, Mark's >plan was to take the low velocity cooling air and re-accelerate >it to merge with the slipstream air for less drag. Hence the >reversed NACA duct.
Understood, but I have the additional advantage of having an engine with too high oil pressure. It is almost unbelievable how far the oil was thrown out of the tail pipe due to the high speed it exited. The pipes centered on the ducts was guaranteed to concentrate the high temp under the fuselage at the exit point. This all goes to the fact that this is all a complex subject and sometimes what seems like a good idea isn't. Larry Severson Fountain Valley, CA 92708 (714) 968-9852 lar...@socal.rr.com
