DRAFT
(trying to learn how this thing works)
Check if this is modelled correctly in CoD!!!
Edit: first tests made. On ground I find a small variation on actual heading, but once in air it works well, it seems. More test to be done. Fascinating stuff
A few posts below, and in the wiki, we talked about how to set the directional gyro, using the compass. Why we need to do that? why the 2 instruments?
Quote from Robert J. Goebel in “Mustang Ace”. He was flying Spifires at this time:
I was almost due south of the field (the course given to me was 345Âş , north Northwest). I rotated the cover glass on the compass and set its two parallel lines to the desired heading. But when I turned the aircraft to align the pointer on the card between the lines, I put the little index arrow at the wrong end.
Unbeknownst to me, I was flying the reciprocal, away from the airfield instead of toward it.
This was a common mistake when using only the compass. To alleviate the problem, the gyro was added. Once it was setup, it gave you the heading you were flying.
Now, how to set a course we want to fly in the compass?
A P8 compass has a rotating bezel (which has the 360º degrees marked on it) and a needle that always points North. In the late P-type compass we have modelled in CoD, the North point of the needle is marked with a small crossbar on it (it was a red arrow before, hence the RAF expression “fly red on red”, now changed for “tee on tee”)
So, to fly heading 135º, you would rotate the bezel until 135º is in the 12 o’clock position of the compass casing:
http://cloud.steampowered.com/ugc/540650441578450435/935C92C1EB84366E594CF9FF9DAD76199D6D0DAB/
Now turn the aircraft until the north point of the needle is pointing to the big “N” in the bezel:
http://cloud.steampowered.com/ugc/540650441596899217/3308E327AC84B9059C7D97EB7F058EF8E10C9388/
That’s it. As long as the needle is between the 2 parallel yellow lines, you are in the correct course, better if you keep them parallel.