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Old March 6th 07, 04:56 AM posted to alt.games.microsoft.flight-sim,rec.aviation.piloting,rec.aviation.student
Mxsmanic
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Posts: 9,169
Default Tweaking the throttle on approach

writes:

If not aligned at the threshold in a real plane, you should go around.
You should strive to become aligned with the centerline soon after
turning onto final, and then hold it there. It can be done with
practice. Don't forget you'll need a crab angle to take care of
crosswind.


I'm pretty sure I've seen videos of real pilots (in small aircraft) turning to
align with the runway _after_ the threshold, but I suppose that just because
they do it doesn't make it a smart idea.

Don't try to do both at the same time. Hold power constant, and
adjust pitch with the yoke until you are at your desired airspeed,
then apply trim until you can release the yoke without the pitch
attitude (and therefore, airspeed) changing. Then with the airspeed
stabilized, adjust power to change the rate of descent, small changes
in power won't affect your airspeed.


OK

You need the proper speed for your aircraft. If it's not available in
the Pilot's Operating Handbook, then use an old rule of thumb, set the
airspeed equal to 1.3 times the aircraft's stall speed. Your aircraft
should be slowed to this speed by the time you turn final, and then
hold it precisely at that speed. The normal way to hold airspeed is
by trimming to that speed in pitch.


I'm usually close to 1.3 x Vso, probably just by luck. I'm usually
preoccupied with holding the glide path and I worry about speed a lot less
unless I'm too close to stall speed. My worst experiences on landing have
occurred because I was going too slow and stalled just above the runway, so
that has spooked me into keeping my speed up. But looking at my aircraft I
see that 100 kts is already just about 1.3 x Vso, so I guess I'm not going so
fast after all. I'm usually going 30-40 kts faster on the approach and only
slow to 100 just before crossing the threshold.

In extreme cases I've slipped forward down to the glide path, which works very
well for descending rapidly without going to fast, but my problem there is
getting myself straight and aligned while exiting the slip.

You will not achieve consistent landings until you can fly a
stabilized approach. To do this, you need to discover the numbers for
your aircraft, and then use them. To find them, I suggest you conduct
some experiments in the sim. Set up your aircraft in level flight on
downwind, constant speed, gear down, at 1000 ft AGL, with a medium
power setting. When opposite the numbers, lower your flaps to their
first setting (or 10 deg) and reduce power until you stabilize at a
500 ft/min descent rate with the airspeed at 1.5 times stall speed.
Record the power setting and airspeed. Use those numbers for your
initial descent from the pattern. After 30 seconds, turn base and
lower flaps to the second setting and set pitch for airspeed = 1.4
times stall speed. Then turn final, lower flaps completely, and set
pitch for 1.3 times stall speed. Fly it like this until you hit the
ground. If you land long, then reduce power a little more next time.
If you land short, add a little power next time. Keep iterating until
you zero in on the right numbers.


OK, I'll try that: 1.5, then 1.4, then 1.3. I think I'm pretty close to that
now.

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