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SWS-AlexVletsas avatar image
SWS-AlexVletsas asked FlyingRaccoon answered

Request: Propeller overspeed governor

As I'm working on the P&WC PT6 engine, a somewhat advanced feature that is missing is the propeller overspeed governor. In simple terms, it is a second, fallback governor that kicks in if the primary governor fails and allows you to still run the propeller.

This link explains the basics about overspeed governors:

And this is from a propeller manufacturer, MT:

The overspeed governor comes with a "test" pushbutton that runs the OS Governor at a specific RPM (94% in our aircraft) to make sure everything is working well. It is done before the first flight of the day.

So to sum it up:

  • OSG is a fallback system to the basic governor
  • It might require its own set of PID controllers
  • Assuming oil pressure remains the same, it will work based on the following basic properties
    • The base governor should be able to somehow fail or turned off for the OSG to work (i.e. test mode)
    • A test would need to achieve a given overspeed_governor_test_rpm value
    • In normal operation, the Overspeed governor will allow you to run the engine at a higher than normal value, overspeed_governor_max_rpm
    • The gearbox ratio will be the same as before, you are just allowed to go to higher Ng % with this.
    • The max N1 would have to either be increased in the engines.cfg file, or a new property should be introduced for the overspeed state limit, i.e. max_n1_overspeed. That property, if blank, could default to the max N1 value that's present anyway
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FlyingRaccoon avatar image
FlyingRaccoon answered

Hello Alex.

There are no plans to implement this feature yet.
I've added it to our backlog so it gets reviewed on a regular basis.
I suggest you create an idea about this so people can upvote it and we have an idea of how many devs need that feature.


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