I flew a demo in a BE 58P Baron into a high altitude
private strip in the Wyoming mountains,
A-A Ranch Airport is an airport in Carbon County,
Wyoming. It has an elevation of 7,880 feet.
With the Continental fuel injection, being the
mechanical constant displacement type, the engines died when
they were set to idle during the landing because they were
too rich and then turbos had spun down. This was a problem
because the runway looked like a ski-jump and I was half way
up the hill. I was able to hold the brakes and get it
started again and manually leaned the mixture to about 1/2
travel on the lever and taxi up the hill to the level ramp
area. Of course you have to keep it full rich in case of a
go-around, so I learned a lesson that was not in the manual,
as soon as touching down, mixture reduce, throttle reduce.
For take-off run up to 2000 RPM then full rich.
I much preferred the Bendix injection because it is
metered by ambient fuel and air pressure, so the mixture is
more stable and self-leaning. I love the PT6 even better.
--
James H. Macklin
ATP,CFI,A&P
--
The people think the Constitution protects their
rights;
But government sees it as an obstacle to be overcome.
some support
http://www.usdoj.gov/olc/secondamendment2.htm
See
http://www.fija.org/ more about your rights and
duties.
"Stan Prevost" wrote in message
...
|
| "Jim Macklin" wrote
in message
| news:7ilwf.41026$QW2.13106@dukeread08...
| I'll buy that, always best to use specific data rather
than
| a generic answer. It takes a pretty good eye and tach
to
| see 5 rpm.
|
|
|
| Sure does. And a digital tach may flicker that much.
Sometimes it is
| called a "barely perceptible rise".
|
| Some say it is easier to observe a rise in MP than such a
small RPM rise,
| and that is borne out by my observation.
| The MP will rise one to two inches, and the MP gauge seems
to be more stable
| than the tach.
|
| If the mixture is set to spec, it is not necessary to lean
for ground ops,
| since it is already lean enough to prevent plug fouling.
Ground leaning is
| effective only if leaned back to the edge of idle cutoff,
anyway.
|
| The Lycoming manual doesn't seem to have any tables for
adjusting RPM rise
| for density altitude. If it is leaned to the 5RPM rise
spec at a high
| altitude airport, I wonder if it might be too lean at a
low-altitude
| airport, with no way to enrichen it.
|
| Stan
|
|