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Seneca II, HSI and FG 2020.1.1

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Seneca II, HSI and FG 2020.1.1

Postby Oswald » Mon Jun 22, 2020 10:34 pm

Hello pilots and developers,

I am a bit confused: In FG 2020.1.1 the HSI of the PA 34 Seneca II doesn't catch the alignment with the magnetic compass with Battery Master on, in FG 2019.1.1 it does. In both cases I use the current FGAddon version of the aircraft (download via launcher).

What happened? Does anybody have an idea?

Oswald
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Re: Seneca II, HSI and FG 2020.1.1

Postby Johan G » Mon Jul 06, 2020 9:15 pm

I think I saw someone else post about it as well, but I am unfortunately unable to find that post.
Low-level flying — It's all fun and games till someone looses an engine. (Paraphrased from a YouTube video)
Improving the Dassault Mirage F1 (Wiki, Forum, GitLab. Work in slow progress)
Some YouTube videos
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Re: Seneca II, HSI and FG 2020.1.1

Postby danilo159 » Tue Sep 22, 2020 1:26 am

Mine isn't working.
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Re: Seneca II, HSI and FG 2020.1.1

Postby WoodSTokk » Tue Sep 22, 2020 12:21 pm

The HSI (also the DG) on most GAs works with a unslaved gyro. If you turn on battery and avionic, the gyro should start to spin.
If the gyro is spinning, the compassrose should rotate if the aircraft rotate. The gyro has no meaning of the magnetic field!
The pilot it self must set the compassrose to align it with the magnetic compass.
Also, the gyro maybe drift away over time. Therefor the pilot should periodically (around all 30min) check the DG/HSI against the magnetic compass and reset it accordingly.

Bigger aircrafts have a magnetic flux sensor that slave the gyro automatically (gyro slaving).
But even than, the pilot should check periodically if the DG/HSI is correct. It can be that the magnetic flux sensor is broken.
If you find some misalignment, switch the slaving from AUTOMATIC to MANUALLY and set it by hand.
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