[RESOLVED] Tomcat heading drift - ED Forums
 


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Old 04-08-2019, 11:16 AM   #1
=BJM=
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Default [RESOLVED] Tomcat heading drift

I have been having difficulty achieving the correct heading and abeam distance downwind and I noticed something...

My heading as indicated on the HUD and VDI will slowly drift left as I progress on the downwind.

I have a carrier setup on the Caucasus map heading 090 (084 magnetic). On the downwind, I attempt to head 264 magnetic, however; I slowly see my heading drift left to the point where when I am abeam the LSO platform, my heading in cockpit is 260 and on the F10 map it's 275 (which would be 269 magnetic). That is a 9 degree error and would explain why I cannot line up correctly on the downwind and struggle with getting the correct abeam distance.

There is no wind.

I flew a Case I at Nellis to test this further and saw that there was no heading drift here and all compass heading matched up. This issue seems to be when landing on the carrier only.

Is this an intended "feature" of the Tomcat or is it a bug?
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Last edited by IronMike; 04-14-2019 at 04:14 AM.
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Old 04-08-2019, 02:50 PM   #2
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HB said that the carrier influences the local magnetic field. Hence i guess it is intended
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Old 04-08-2019, 02:53 PM   #3
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Quote:
Originally Posted by Moafuleum View Post
HB said that the carrier influences the local magnetic field. Hence i guess it is intended
I understand that, but I thought that was just while on the carrier deck. Are you saying that the carrier's influence extends out some distance as well?
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Old 04-08-2019, 03:09 PM   #4
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For my cent I believe 9 degrees are the difference between boat and the deck carrier...
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Old 04-08-2019, 03:33 PM   #5
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Quote:
Originally Posted by =BJM= View Post
I understand that, but I thought that was just while on the carrier deck. Are you saying that the carrier's influence extends out some distance as well?
Magnetic fields don't decay according to a step function but continuously. Don't quote me on that but I believe I read somewhere that it can be one or two miles (or more?). The nearer to the source the more distinct the effect will be.
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Old 04-08-2019, 03:36 PM   #6
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Quote:
Originally Posted by =BJM= View Post
I understand that, but I thought that was just while on the carrier deck. Are you saying that the carrier's influence extends out some distance as well?
Yes

But it decays quite fast.
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Old 04-08-2019, 03:46 PM   #7
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That's a phenomenal level of detail.
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Old 04-08-2019, 03:55 PM   #8
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Quote:
Originally Posted by Cobra847 View Post
Yes

But it decays quite fast.
Holy moly! Phenomenal level of detail indeed!!

Well, they say the HUD is useless in landing mode and now this added on top of that...can the Tomcat get anymore difficult to land?!


What is the correct procedure to account for this? How do we fly the correct headings? Is it just all visual?
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Old 04-08-2019, 04:05 PM   #9
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Quote:
Originally Posted by =BJM= View Post
What is the correct procedure to account for this? How do we fly the correct headings? Is it just all visual?
Tacan needle should always point towards the ship's direction. The question is, does the tuned course line also drift? Since it is set to a specific bearing. If not, then this is your solution.
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Old 04-08-2019, 06:46 PM   #10
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Quote:
Originally Posted by Moafuleum View Post
Tacan needle should always point towards the ship's direction. The question is, does the tuned course line also drift? Since it is set to a specific bearing. If not, then this is your solution.
The tuned course line drifts as well since that is tied directly to your compass rose on the VDI.

I did a quick test and it looks like while on the carrier, it adds another 23 deg in magnetic variation on top of the already 6 deg on the Caucasus map.

For example: The carrier is heading 090, the Caucasus map mag variation of 6 deg will give a actual carrier heading of 084. Sitting on the deck, aircraft heading in cockpit will actually be 061 deg and not 084 due to the effect from the carrier.

1.2 abeam, the added magnetic variation effect from the carrier decreases to about 4 deg.

What this means is that when I am trying to line up on the 264 radial and get myself 1.2 abeam the carrier, what I see as 264 deg in my cockpit is actually my aircraft travelling 260 deg. Doesn't seem like much but it's enough to require a correction.
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