Knobs on the HSI turn together with heading change

[Randolf]

Just noticed that the course and heading bug knobs on the HSI are rotating by itself in sync with the HSI heading when the plane is turning. That's probably not realistic, right? Flying the Grand Duke rn.

[Black Square]

I saved this video months ago, just for you

[Randolf]

@Black-Square wow, really didn't expect that, just learned something new thanks to your amazing rendering of the Duke

[Black Square]

I've used this "feature" in real airplanes to hold the heading bug in a constant position relative to the aircraft's nose while the compass card rotates underneath (for example, to start a left turn before you've decided upon exactly what heading to roll out), but not I've never read anything that suggests this was the intent behind the "feature", of it was done purely out of mechanical convenience.