F-14 AoA Indexer

07 Apr 2020 17:11 #45882 by timi
But your aircraft isn’t complete without a decent hairdryer sound, yes?

Anyway, I asked about the update you just pushed and the latest update at the time was four days old?

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07 Apr 2020 17:20 #45883 by Algernon

timi wrote: But your aircraft isn’t complete without a decent hairdryer sound, yes?

<chortle>

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08 Apr 2020 17:04 #45886 by Richard

timi wrote: ...update you just pushed and the latest update at the time was four days old?


Sorry if what I said at the start of my previous message wasn't clear - what I meant to say was that "sorry for forgetting to push (to the right repository) - I've now pushed the changes to my github".

Currently I'm working on the Roll SAS based on what's in TM 81833

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08 Apr 2020 17:47 #45889 by timi
Alright, I’ll have look. Thanks! :cheer:
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10 Apr 2020 17:38 #45893 by timi
I think the Yaw SAS works as advertised. It stabilizes landings by reducing the
tendency to dutch roll. And I think it allows less cross controlling between the
stick and the pedals when landing. It also made flying through thermals easier
with less work on the controls.

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10 Apr 2020 19:28 #45894 by timi
Also about sounds. I took a new tool to my arsenal, and that is
real-time spectrum analysis.

This is the N2 whine from an F110-GE-129B engine. Not
specifically the same as in the F-14B but perhaps something to
think about anyway. The pitch of the sound goes from 1679 Hz
to 4470 Hz. From idle to afterburner.


This is the N1/N2 whine from your F-14B.


The analysis came from this video.


And this is an approach and landing from an F-16 with likely the same
engine by the looks of the plot.


That one was from the landing of this video.
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14 Apr 2020 19:43 #45915 by Richard
Thanks for testing.

The audio analysis is interesting; but I'm not convinced about any analysis of cockpit videos, instead something like the other video or this video (3:03)
may be useful to analyse.

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14 Apr 2020 21:10 #45919 by timi
This is a F110-GE-100 per this shorter video:


Startup. N2 idles at 1795 Hz.


N1 idles at 615 Hz. With 17 fan blades that would come out to
615*60/17=2171 RPM


The first line runs up to around 1.5 kHz before it's wiped out by the
afterburner. It might be N1 but not sure. N2 is wiped out at 3.935 kHz.


Shutdown.
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17 Apr 2020 12:23 #45944 by timi
Scratch the RPM figures though. I've been looking into it and realised
there's no way to explain the frequencies the engine produces by the
fan or the core rotor alone.

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