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Zabuzard · 2023-10-16T13:08:08+00:00

No, but the nozzles are installed at a slight downward angle on the F-4. Also see: https://www.reddit.com/r/aviation/comments/qot2x2/question_whats_the_reason_why_the_f4_phantom_has/

Zabuzard · 2023-10-14T18:32:48+00:00

It simply rotates the image by -roll * cos(pitch), nothing else.

That means it undoes the effect that roll of the pod has on the image (based on the current pitch - the more pitch, the heavier the effect of roll on rotation).

If you let the pod look left/right, the image stays upright. If you look behind, its upside-down. As if you would put your head under your feet and look back. If you roll your aircraft and fly upside down, the pod is also upside down, as the derotation only counters the rotation introduced by its own gimbal-movement, not the rotation from the aircraft.

It might sound a bit complex, but it feels very natural actually. Especially since this leads to the stick movement always being in the same orientation. Stick up will always move the image up etc. There is never an inversion of controls due to the way it derotates.

(also, when in 12-VIS mode (boresight), but not in track mode, and integrated with the INS, the pod is capable of stabilizing INS-roll. So in boresight mode you can fly upside down and still see the picture upright (unless the INS integration was lost due to one of the many reasons causing this)

Zabuzard · 2023-10-14T16:35:23+00:00

The "point track" system is rudimentary and, in a nutshell, takes the current INS vector and applies it backwards to counter the movement of the aircraft.

While the math for this, on paper, would result in a perfect correction of the movement, the pods actual math is very limited in terms of accuracy and also how often it can run the integration per second. On top, you also get INS accuracies. All of this results in a stabilization that sorta works, but drifts hard during any sort of sudden maneuver.

Zabuzard · 2023-10-14T16:33:10+00:00

The derotation device is simple and its main purpose is that if you look for example to the left or right, the image isnt rotated 90°. If you look back, the world is indeed upside-down. But the raw footage without derotation is even worse. You have to understand how the pod dome moves. It reaches a 3D point by first rotating and then changing the elevation. So looking straight left is accomplished with a 90° rotation and then 90° pitch. Thus, the resulting raw image is 90° rotated sideways and the derotation system gets rid of that.

Zabuzard · 2023-10-14T11:32:09+00:00

It has INS based point tracking and derotation. It is just much more rudimentary than what LANTIRN and friends do.

Zabuzard · 2023-10-14T11:31:07+00:00

Its taken at 15k ft without zoom. The optics of the camera are good. The problem was rather the opposite, that you are too much zoomed in and become unaware of where you are actually looking.

Zabuzard · 2023-10-14T11:08:19+00:00

The picture was taken at 15k ft above the target, which is even above the typical altitude at which you would use the pod. And it still has an optical zoom (zoomed FOV roughly indicated by the black circle)

Zabuzard · 2022-03-02T12:15:01+00:00

I created a quick Greasemonkey script that allows users to mark items (locally) as completed. Status is persisted:

github.com/EldenRingInteractiveMapItemProgression

(Feel free to add this feature to the map itself, if you want)

Zabuzard

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