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Posted

Hi all,

 

I'm wondering what the purpose of the HSI heading marker is in the A-10C. Since there's no true heading track autopilot mode, it seems like the heading marker adjustment has no system function (other than perhaps a mental reminder to the pilot of an assigned heading etc).

 

Thoughts?

-George

"The defense dept regrets to inform you that your sons are dead because they were stupid..." :bomb:

 

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Posted

Never thought to use it for that. Thanks. Will come in handy when jtac says nake your run xxx degrees.

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Posted

The heading bug is a visual "reminder" of what heading the pilot should be flying. Of course, it does him/her no good if it is not set to the heading they want ;-D Some aircraft slave the autopilot to the bug so it would serve a dual purpose in that case.

 

The HSI is a pretty handy gauge once you really learn how to use it. Better than the old VOR and Card Compass gauges since the HSI is slaved to the compass and doesn't have to be re-calibrated all the time due to precession.

  • Like 1
Posted (edited)
Never thought to use it for that. Thanks. Will come in handy when jtac says nake your run xxx degrees.

 

No worries. Yeah this is a very common tool IRL.

 

I just wanted to make sure I wasn't missing some systems function that was based on this marker. (and really, who decided to upgrade the avionics bay on this bird and decided that a heading lock ap mode wasn't needed?)

 

Thanks!

G

Edited by gmohr

"The defense dept regrets to inform you that your sons are dead because they were stupid..." :bomb:

 

System: i5 2500K @ 4.7, AMD 6950 (unlocked), HP ZR30w, TM Hotas Warthog

Posted

it's a good tool to remind me the wind direction

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Posted
(and really, who decided to upgrade the avionics bay on this bird and decided that a heading lock ap mode wasn't needed?)

 

Technically, the LAAP does have a heading mode...you just can't modify the heading once it's engaged. The reason is because the autopilot has no control of the ailerons. It uses only the rudders to maintain heading.

 

Maintaining present heading with rudders is not an elegant solution; asking that system to respond appropriately to the pilot spinning the heading bug 90 degrees is...well, not possible.

 

In order to have a true heading mode, the SAS and flight control system would require a redesign.

"They've got us surrounded again - those poor bastards!" - Lt. Col. Creighton Abrams

Posted

U could use it as a guide for ingress or egress for a high threat or target area, if your FP did not follow that route.

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Posted
Technically, the LAAP does have a heading mode...you just can't modify the heading once it's engaged. The reason is because the autopilot has no control of the ailerons. It uses only the rudders to maintain heading.

 

This seems untrue. The autopilot has roll authority, as it keeps wings level in alt/hdg mode. The only thing missing is some software to track the hsi marker instead of the heading at the point of AP engagement. The omission is glaring, as any basic civ autopilot install in an IFR certificated airplane will have this capability.

 

Regards,

George

"The defense dept regrets to inform you that your sons are dead because they were stupid..." :bomb:

 

System: i5 2500K @ 4.7, AMD 6950 (unlocked), HP ZR30w, TM Hotas Warthog

Posted
The omission is glaring

 

Regards,

George

 

I think you should write a letter to the Department of Defense, The USAAF and Fairchild Republic:megalol:

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Posted
I think you should write a letter to the Department of Defense, The USAAF and Fairchild Republic:megalol:

 

Hahaha i agree! They are usually pretty free with my tax dollars! :lol:

"The defense dept regrets to inform you that your sons are dead because they were stupid..." :bomb:

 

System: i5 2500K @ 4.7, AMD 6950 (unlocked), HP ZR30w, TM Hotas Warthog

Posted
The omission is glaring, as any basic civ autopilot install in an IFR certificated airplane will have this capability.

 

Unfortunately, the A-10C was developed under a government contract. Which also means a commitee. Both environments are not conducive to quality or completeness.

 

Somehow, I can imagine the discussions including statements like, "Those pilots don't need that. That's why we gave them electronic maps and a compass."

 

Sad but all too likely I am afraid.:huh:

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Posted
This seems untrue. The autopilot has roll authority, as it keeps wings level in alt/hdg mode. The only thing missing is some software to track the hsi marker instead of the heading at the point of AP engagement. The omission is glaring, as any basic civ autopilot install in an IFR certificated airplane will have this capability.

 

Regards,

George

 

The autopilot's only roll authority comes from the rudders. The LAAP uses the SAS system to position the flight controls. Notice that the SAS has only Pitch and Yaw channels...

 

It's possible, but inelegant to MAINTAIN a heading using the yaw/roll authority of the rudders, but it's not possible to turn the airplane in response to heading bug movement.

"They've got us surrounded again - those poor bastards!" - Lt. Col. Creighton Abrams

Posted
The autopilot's only roll authority comes from the rudders. The LAAP uses the SAS system to position the flight controls. Notice that the SAS has only Pitch and Yaw channels...

 

It's possible, but inelegant to MAINTAIN a heading using the yaw/roll authority of the rudders, but it's not possible to turn the airplane in response to heading bug movement.

 

Wow, I wouldn't have guessed that! Inelegant is a good word for it, but it obviously works. Thanks for the info.

"The defense dept regrets to inform you that your sons are dead because they were stupid..." :bomb:

 

System: i5 2500K @ 4.7, AMD 6950 (unlocked), HP ZR30w, TM Hotas Warthog

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