"David Megginson" wrote in message
...
"Tom S." writes:

There may be planes where it's not OK to lean at 75%, but all of the
POH's I've looked at so far *require* leaning at 75% power to get the
performance numbers (fuel burn and range) that they list.

http://www.avweb.com/news/columns/182152-1.html (Article 57, but read 58
&
59 as well).

[As far as I understand, you're saying that people should run engines
full rich at 75% power. If that's not your point, apologies in
advance for the misunderstand.]

I'm a big fan of Deakin, and it's worth reading this article more
closely -- he's *not* recommending flying full rich at 75% power, but
rather, not leaning to 50 degF ROP. Here's the part that I'm guessing
you were looking at:

Nope, he's recommending 40 LOP or even more lean than that. After peak,
CHT's AND EGT drop.

Read the article again (closely, as you mentioned) and read the four part
series. Hell, read his entire series of engine management articles (in the
sidebar).