"Mxsmanic" wrote in message
...
J. Severyn writes:

It is called the "red fin" in this write-up by Cirrus....same thing.
http://www.cirrus147.com/training/LOPops-3-195278.pdf

OK, I think I've got it. The red box is the area where you heat up
the engine enough to reduce engine life over the long term, without
any clear advantage for fuel consumption or power. If you are leaner
or richer than the box, you get longer life and a better power/fuel
trade-off.

Mxs, maybe we can get you to fly a real aircraft if we keep this up.

That would require lots of time, lots of money, and some other things.

--
Transpose mxsmanic and gmail to reach me by e-mail.

Bingo! You've got it.

The red box is also where high peak internal cylinder pressures are
encountered. The combination of the high temps and high internal pressures
are detrimental to the life of the engine, and tend to thin out the owner's
wallet very quickly. (or worse)

The same power output (but less than max power) can be attained ROP and LOP,
but the engine runs cooler and more efficiently LOP. But the pilot must
ensure he/she is LEAN enough to stay out of the red box.

If the pilot needs maximum power (say during max. gross weight takeoff),
then ROP operation is normal. But again, the pilot must ensure he/she is
RICH enough to stay out of the red box. Fuel economy is not an issue during
the takeoff......just max power to clear obstacles and safely climb to a
cruise altitude.

Mxs, if you ever make it to the San Francisco Bay area, look me up. I'll
get you a few hours in the air where you can try it out yourself.

John Severyn