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Forum: Tech Log
10th May 2019, 14:27
Replies: 52
Views: 20,710
Posted By compressor stall

Great story BP - thanks for posting. It...

Great story BP - thanks for posting.

It reminds me of one from one of my colleagues back in the late 70s or early 80s. He was flying a biz jet to the N Pole with a load of some half a dozen nav...
Forum: Tech Log
9th May 2019, 00:33
Replies: 52
Views: 20,710
Posted By compressor stall

And I believe they can update position...

And I believe they can update position referencing known underwater topography.

Which is probably one of the many reasons why why the Chinese were doing this....
Forum: Tech Log
7th May 2019, 09:54
Replies: 52
Views: 20,710
Posted By compressor stall

You might not have been talking about alignment,...

You might not have been talking about alignment, but I was. That’s why I even put a “1. Alignment “ at the start of my paragraph and you even quoted it. :ugh:

And I’m eagerly awaiting your answer...
Forum: Tech Log
6th May 2019, 21:20
Replies: 52
Views: 20,710
Posted By compressor stall

A320F has a latitude limit for alignment of 82...

A320F has a latitude limit for alignment of 82 N/S with or without the polar nav mod. And between 60 and 82 it takes significantly extra time.

One of the advantages of the polar nav mod is that it...
Forum: Tech Log
6th May 2019, 11:54
Replies: 52
Views: 20,710
Posted By compressor stall

DJ Flyboy Don’t confuse the two limitations. ...

DJ Flyboy Don’t confuse the two limitations.

1. Alignment. Most IRSs can’t align above the low 80s N/S as there is not enough change in velocity to align the gyro. Think a gyro at the pole is just...
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