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Marcelo Pacheco wrote:

<<Lycoming probably assumes very poor ram air effect on their charts, as all
certified aircraft with IO-360/320's don't go faster than 140 ktas.>>

In fact, if you examine the data on the Lycoming Altitude Performance curves
(some of which defines in crystal-clear detail how to use these excellent
charts) you will see it explicitly stated that the data presented therein
assumes "...zero ram...".

Also, I think the statement about "..ALL certified aircraft..." can be
adequately rebutted by the performance of the Twin Comanche and the Wing
Derringer, to name only two such aircraft.

Jack Kane
EPI, Inc.
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