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donstim avatar image
donstim asked FlyingRaccoon commented

Questions about pitch/roll/yaw gyro stability parameter

I am confused by the documentation of the gyro stability terms, which are separate from the gyroscopic precession terms. One part of the description makes it appear that these terms relate the overall stability of these airplane axes to the world frame of reference, and in that way are overall stability parameters not dependent on gyroscopic precession of moving parts. Another part relates this stability to "turning parts" as if it is related to gyroscopic precession.

The description goes on to say that it makes the airplane less sensitive to turbulent air by making the airplane more stable relative to the world. The default value is 0. What is the allowable or "normal" range of values that are either possible or would make sense, and what is the sensitivity of this parameter? For example, is the normal range from 0 to 1, 0 to 20, 0 to 500, or what?

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FlyingRaccoon avatar image
FlyingRaccoon answered FlyingRaccoon commented

Hello @donstim

The original precession parameters are inherited from FSX and allowed you to adjust aerodynamic stability. The issue when you had just those is that it only accounts for stability relative to local airflow, and has no influence on instability caused by microturbulences and vortices that were added to MSFS.
We therefore exposed a set of parameters to independently adjust stability relative to world so that the influence of local air flow can be diminished.

You can see this as a way to parameter the influence of rotating parts on stability with 2 separate components: aerodynamic and global.

As for the range of values, these are used as scalar so you can use pretty much what you want although I think you'll often be in the [0;2] range.

Does that make sense?


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So, both precession parameters only affect the influence of rotating parts on stability? That is, they would normally have no effect on a turbojet airplane?

This question stems from an attempt to find a way to make the airplane less affected by big jumps in atmospheric pressure or winds that seem to be caused by environment injections in the sim or maybe overly large updrafts/downdrafts in mountainous areas.

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That's right, precession scalar are applied when computing engine torque in the case of piston engine and turboprops, not jet engines.

To adjust the stability of your aircraft in the case you are mentioning, pitch/roll/yaw_gyro_stability is the way to go.

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