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Originally Posted by sfhand
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Originally Posted by compressioncut
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Originally Posted by TLAM Strike
A sub with Five blades will have Five lines visable on DEMON, the shaft line will also be the same line as the 1st blade line.
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Slight clarification - the fifth line will be the first blade harmonic overlaid with the fifth shaft harmonic.
That's how it works in real life, too, and is the biggest part of narrowband passive acoustics in DW that is true-to-life (albeit best case scenario, all the time). |
This is really confusing me. The manual says (for each platform with DEMON) "The first line on the left indicates the shaft rotation speed. The other lines indicate individual blades on the propeller."
As I understand TLAM strike the shaft rotation speed is modeled on a line that also represents a blade line which, by my reading, contradicts the manual. Perhaps I've missed an update in a readme doc or something. I will post my question on the SCS board to get their take on the issue. |
No, that's correct. The
first line is the shaft rotation rate. Lines beyond the first one are
harmonics of the shaft rotation rate. The final line is the first blade rate harmonic, which (in DW) is also the final shaft harmonic.
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| is shaft 1, shaft 2, shaft 3, shaft 4, shaft5/blade1. For a five bladed contact. The theory is the same for any number of blades.
It works perfectly in DW, but in real life you are very unlikely to get something that cut-and-dried with a modern naval contact. Shaft lines are rare and usually a symptom of a mechanical problem with the ship/sub. Blade is more common but you may not get blade1, perhaps blade2 or 3 only. And so on.