Simviation Forum - autopilot question

Apr 10^th, 2005 at 11:14pm

JackieAdkins Offline
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Tulsa, Oklahoma

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what are the Backcourse and Yaw Damp. thing for on the auto pilot? i have everything else on the AP down except the BC and Y/D. thanks

THE OBJECT OF WAR IS NOT TO DIE FOR YOUR COUNTRY BUT TO MAKE THE OTHER BASTARD DIE FOR HIS.&&&&&&&&&&&&

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Reply #1 - Apr 11^th, 2005 at 4:56pm

Webb Ex Member
I Like Flight Simulation!

I'll tell you everything I know about backcourse hold. Keep in mind that I have used this feature exactly once, and that was just to see if it worked.

Backcourse hold is the opposite of approach hold. If you have an airport with runways at 9 and 27 and only runway 9 has an ILS you can use the backcourse hold and the ILS to land on runway 27.

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Reply #2 - Apr 11^th, 2005 at 5:05pm

jrpilot Offline
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So thats what it is..Do you know how accurate it is?

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Reply #3 - Apr 11^th, 2005 at 5:41pm

JackieAdkins Offline
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Tulsa, Oklahoma

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sorry i just dont understand that one, anybody else?

THE OBJECT OF WAR IS NOT TO DIE FOR YOUR COUNTRY BUT TO MAKE THE OTHER BASTARD DIE FOR HIS.&&&&&&&&&&&&

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Reply #4 - Apr 11^th, 2005 at 6:21pm

Nexus Offline
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The greater of two evils...

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The Yaw damper is basically a gyro operated SAAS (stability augmentation autocontrol system)...yes yes very nifty name, but what does it actually do?
Well, the yaw damper provides immediate rudder input when necessary, to aid in cancelling out yaw tendencies, such as dutch rolls. Its an autopilot for the rudder that nullifies the yaw so you can keep your feet on the floor

Backcourse is A "reversed" ILS approach (you're approaching the runway from the opposite direction). Though the glideslope won't work, you still have LOC information. There have been a few discussions about Backcourse lately, I suggest you do a search, and the APR (APPROACH HOLD) has been brought up quite a few times aswell, so look that up while you're at it.
I know some posters had WONDERFUL replies which gives you all the information you need.

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Reply #5 - Apr 11^th, 2005 at 10:15pm

beefhole Offline
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common' yigs!
Philadelphia

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Here's something I wrote a while ago-I forgot to mention that you wouldn't have any glideslope, so just keep that in mind.

Okay, assume you have one runway at an airport. Runway 36/18. 36 has an ILS, but you want to make an ILS landing 18. Tune 36's ILS, and then think of the localiser like a mirror. Instead of chasing the dot, the dot now represents YOUR position on the localiser, as opposed to where you're supposed to fly. When you hit Backcourse, it does the same thing as hitting APP except it will follow the new set of rules (dont chase the dot, because the dot represents your position on the glideslope)

Here, go to an airport that has a runway with only one ILS, and land the other way. Fly it just like an ILS approach, except hit B/C instead of APP, and you need to manually control altitude.

Did that do it?

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Reply #6 - Apr 12^th, 2005 at 2:49am

OTTOL Offline
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Fintas, Kuwait (OKBK)

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Quote:

Instead of chasing the dot, the dot now represents YOUR position on the localiser, as opposed to where you're supposed to fly.

Or you could just set the course needle to the reciprocal(the course of the ILS who's BC you're shooting)and there won't be any reverse sensing issues......
Roll Eyes

.....so I loaded up the plane and moved to Middle-EEEE..........OIL..that is......

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Reply #7 - Apr 12^th, 2005 at 8:51am

beefhole Offline
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common' yigs!
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Yeah... I knew that... Cheesy

The thing that I've found is, that in FS, the course thing makes absolutely no difference at all. I set it to the wind direction, and the AP has no problem tracking the ILS.

But if you did set it to the reciprocal, then wouldn't you use APP instead of B/C, since it would be just like flying a localiser approach?

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Reply #8 - Apr 12^th, 2005 at 5:18pm

JackieAdkins Offline
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Home Airport: KTUL
Tulsa, Oklahoma

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awesome thanks for the BC info, and with the Y/D would you use that when there is alot of wind involved or what? when would be a good time to use that?

THE OBJECT OF WAR IS NOT TO DIE FOR YOUR COUNTRY BUT TO MAKE THE OTHER BASTARD DIE FOR HIS.&&&&&&&&&&&&

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Reply #9 - Apr 12^th, 2005 at 5:21pm

beefhole Offline
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It should be engaged whenever autopilot is engaged-on during the takeoff roll, off during the rollout.

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