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 25 Autopilot use - tutorial by Lou (Read 38849 times)
Berlopez
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Re: Autopilot use - tutorial by Lou
Reply #15 - May 28th, 2012 at 7:53pm
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Hi Lou: (Hick)...I think the reason I was having all those calls, was I was using a saved flight and downloading real Weather on top of it ??? I'm not 100% certain of this.

I just reflew the flight had terrible difficulties loading the 727 from start.So I loaded the default 737-800... I'm Loading FSx with AlacrityPC Which a member at the avsim forums helped me install.When I reached my cruise alt. I changed to the 727 and continued the flight. All went very well. It behaved itself; Upon landing at Hamburg ( Hamburg airport ILS RWY 5 it went by the book!  Smiley









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Re: Autopilot use - tutorial by Lou
Reply #16 - May 28th, 2012 at 9:03pm
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Some how I missed a post from Antonio P... I am sorry!   Sad

The question was: And how did you flied Holding patterns? Using the turning knob, the heading select or by hand? If using turning knob how did you proceeded?

Antonio, most pilots used the heading select. Some would use the turn knob as well. Hand flying in a holding pattern was a pain!  Shocked

The heading select was the best for me. You could get the orientation from the chart and if you knew the wind you could apply a correction right from the beginning, or take a turn in the pattern and figure the wind drift and then make the correction.

Sorry again for the tardy reply!

Lou  Embarrassed
  

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Fly out of Utah
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Re: Autopilot use - tutorial by Lou
Reply #17 - Jun 15th, 2014 at 5:40am
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Hi Lou
I have been practicing landings for a few weeks and I'm trying to keep from porpoiseing in the glide slope. Is there any good technique to stop this from happening. Auto GS is the worst for this condition at KJFK. I am pretty sure I am low enough to be under the GS when I capture it. The manual GS usually keeps me at -700 fpm on descent which is what I want. I am starting at 1500 alt and about 8 or 9 miles out from rwy 22R. Any suggestions would be helpful. Undecided
  

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Re: Autopilot use - tutorial by Lou
Reply #18 - Jun 15th, 2014 at 8:07pm
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I'm not sure why you are having this problem in AUTO G/S and not in MAN G/S. Once you are on the glide slope switching from AUTO to MAN should not make any difference. Once you are on the glide slope in either mode the dynamics are the same.

One thing that will cause pitch changes is thrust changes. Since this is old school flying there is no auto-thrust so you need to be aware to make smooth & slow changes to power as you capture the G/S. If you are level and doing about 150 kts with flaps 15 approaching the glide slope, as the glide slope comes alive, select gear down. As the G/S is around one dot above, flaps 30 and keep an eye on the speed. The speed bleed to approach speed of let's say 125 to 130 kts should work out just right to see the plane pitch down as the G/S is captured. Make small corrections to the thrust to keep the approach speed of 130 to 125 kts.

The main difference in the 727 and the newer planes (767, 777) is the size of the fan part of the engine. A very small physical movement of the thrust levers on the big fan planes gives you a large thrust change. You may find you will move the thrust levers more distance on the 727 to obtain the desired thrust change. Still, you need to make small actual thrust changes to avoid a pitch change.

I just flew the 727 through several autopilot approaches and even when I was a bit fast with the power changes the plane did pretty well holding the G/S.  Try hand flying the plane through a series of approaches just using raw data from the ADI to hold the G/S (no autopilot) and see how power changes affect the ability to keep the plane on the glide slope. Get the plane on about an eight to ten mile final at the proper approach altitude with flaps 15 and around 150 knots. Save the position/flight so you can repeat the approach over and over until your happy with your performance.

Keep us informed about your progress....  Cool

Lou
  

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Re: Autopilot use - tutorial by Lou
Reply #19 - Jun 16th, 2014 at 1:09am
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Fly out of Utah wrote on Jun 15th, 2014 at 5:40am:
Hi Lou
I have been practicing landings for a few weeks and I'm trying to keep from porpoiseing in the glide slope. Is there any good technique to stop this from happening. Auto GS is the worst for this condition at KJFK. I am pretty sure I am low enough to be under the GS when I capture it. The manual GS usually keeps me at -700 fpm on descent which is what I want. I am starting at 1500 alt and about 8 or 9 miles out from rwy 22R. Any suggestions would be helpful. Undecided


I had porpoising with the 727 A/P pilot as well. Are you using SP2 or are you running Acceleration? When I reinstalled FSX I changed from SP2 to Acceleration and the porpoising problems completely stopped and the AP has been very smooth since. But, as Lou pointed out, incorrect throttle usage can also cause this problem. If you're running SP2 and not Acceleration, that could be the problem. But regardless of SP2 or Acceleration, throttles must be managed with finesse while on GS capture. Just a little insight for you.

cheers,
Brian
  
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Re: Autopilot use - tutorial by Lou
Reply #20 - Jun 16th, 2014 at 1:41pm
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Thanks for the help
I use Acceleration, so my problem was throttle control, now resolved.
Last question for Lou, Rwy 22R the approach to the runway is right to left and it wants to land off to the left on the grass. Instruments keeps the centerline to the left, so do I disconnect AP  before threshold to stay centered? Heading is 222 degrees, according to SimPlate, seems right. Roll Eyes
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Re: Autopilot use - tutorial by Lou
Reply #21 - Jun 16th, 2014 at 5:07pm
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Marc,

RW 22L where? KJFK?

Anyway, as you know, this is NOT an auto-land plane so you must disconnect and hand fly the plane to a landing. Not sure why the ILS or Plane wants to be off the centerline, but I have seen that before and it was some ad-on scenery I had that was not correct.

The heading that you would put in the HSI window will not cause this as the ILS does not use this information like the VOR. If you put in the wrong heading, the autopilot sees that as a crosswind.

I have acceleration installed.

Lou
  

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Re: Autopilot use - tutorial by Lou
Reply #22 - Jun 16th, 2014 at 5:52pm
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Hi Lou
Yes it is at KJFK, and I do disconnect prior to landing, it is just my timing on this. I have done more practice and I am almost there on the centerline. Do not have any add-on scenery, so that is not an issue.
I think I just have to follow thru on the landing after disconnecting to watch I stay on centerline. Will watch my indicators closely next time and the heading. Have noticed the centerline on different parts of runway has different degrees, so not so easy. Huh
Marc
  

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Re: Autopilot use - tutorial by Lou
Reply #23 - Jun 17th, 2014 at 2:17am
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I'm bad. I disconnect the A/P at arpund 200 feet AGL and fly it the rest of the wsy. I rarely have any trouble with it holding the ILS and it aligning with the centre of the runway.

I have FSX Acceleration too.
  

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Re: Autopilot use - tutorial by Lou
Reply #24 - Jun 17th, 2014 at 4:10am
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Hi Mark
Try Rwy 22R at KJFK and see if you can hold the centerline, or tell me why I am having trouble with it, I get to the runway ok, then when I go into reverse thrusters I start to veer off. Tough to hold it straight.  Shocked
Marc
  

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Re: Autopilot use - tutorial by Lou
Reply #25 - Jun 17th, 2014 at 8:31pm
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Anybody want to tell me why the LOC freqs at KLGA do not work on FSX.
Especially rwy04, 110.50. NO DME, nothing. Tongue
  

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Re: Autopilot use - tutorial by Lou
Reply #26 - Jun 19th, 2014 at 2:36am
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Okay, I was able to intercept the LOC tonight, still no DME. Guess that might be something that doesn't always happen for the LOC. Happy Landing.  Grin
  

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Re: Autopilot use - tutorial by Lou
Reply #27 - Jun 19th, 2014 at 10:36am
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In Australia, most LOC are not DME. I'm disappointed in it, but it might be like that in real life, so ... it is what it is. Sad
  

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Re: Autopilot use - tutorial by Lou
Reply #28 - Jun 19th, 2014 at 9:15pm
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Thanks Mark
Now I know in this aircraft to use the VOR freq  of the airport in the 2nd Nav radio for my DME. I think this should work to know how far out I am from runway. Smiley
  

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Re: Autopilot use - tutorial by Lou
Reply #29 - Jul 21st, 2014 at 8:22am
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Thanks a lot  Smiley .
  

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