[jhb] Re: Getting too real
- From: "Fossil" <fossil@xxxxxxx>
- To: <jhb@xxxxxxxxxxxxx>
- Date: Tue, 28 Jul 2009 18:43:46 +0100
I can only give general values as there are always exceptions. For example you
can’t leave mixture at 100% for taxy or take off from high altitude airports
because the engine will be too rich and you have to lean for max power.
For normal ops you should taxi with the RPM and Mixture levers fully forward
and just use throttle for speed control (steering also in twins). On take off
you apply the throttle to the book values – this may be full throttle but on
turbocharged engines you may have an MP limit. Once established in the climb
you reduce power, rpm and mixture to climb values (in the Aztec this was
24”/2400 and 16gph). As you climb the air will get thinner and MP will drop so
you need to check this every 1000ft and increase throttle as required to keep
the MP up. Eventually you will be back at full throttle and from that point on
further climb will see the MP fall off.
Once in the cruise you reduce power, RPM and mixture to published cruise
figures. Again in the Aztec this was 22”/2200 and 10gph. For a gradual descent
we never touched any levers as the CSU keeps RPM adjusted automatically.
However, if descending from high altitude you need to watch mixture as this
will get weaker as you descend. If you touch the power at all during the
descent you need to set mixture and RPM before touching the throttle. As you
approach the airfield you should have mixture back up to max and throttle/RPM
at approach settings. During the approach the RPM should be increased to
maximum so that if you have to go around you can apply full throttle without
hurting the engine.
bones
bones@xxxxxxx
From: jhb-bounce@xxxxxxxxxxxxx [mailto:jhb-bounce@xxxxxxxxxxxxx] On Behalf Of F
FISHER
Sent: 28 July 2009 17:23
To: jhb@xxxxxxxxxxxxx; jhb@xxxxxxxxxxxxx
Subject: [jhb] Getting too real
So have I got it right.
For takeoff/climb to cruise
All levers full, (pitch fine and mix rich) then reduce power to set climb rate.
At cruise
Set power, then rpm, then mixture, for eco cruise.
For descent
Set power for descent rate.
For landing
Leave rpm and mix as set for cruise?, or set levers to full ? ie fine pitch and
rich. (I have been setting the levers full on)
Please correct as needed.
Note
I find that FSX planes, do not seem to perform as spec, ie I do not get the
rated speeds and fuel comsumption, dispite numerous tests. In fact, I have been
playing around with the AC config files to get the performance as stated. ( now
got the C172 maxing at 140kts, 70% throttle giving the rated 100 cruise,
hopefully without compromising on the consumption, the B727 needs a bit of work
too, only get 2/3 thirds the stated range). Will have to have a go at the B58
and B350 as well, as the throttle needs to be at 75% min.
Frank F
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