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Indiafoxtecho avatar image
Indiafoxtecho asked Indiafoxtecho commented

Vertical Speed reference value... fixed to 3000 ft/min?


I am trying to add the possibility for the pilot to control autopilot vertical speed on my F-35 - mostly because, even if I change the default value, the vertical speed reference value VSpeedREF seems limited to 3000 ft/min.
If the pilot inputs a different value and the value is below 3000 feet/min everything is fine.
If the pilot inputs a value greater than 3000 feet/min the VSpeedREF gets the value and goes briefly to the specified value and then quickly jumps back at around 3000 feet/min.

Is 3000 an hardcoded limit? Or can it be set somewhere?

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FlyingRaccoon avatar image
FlyingRaccoon answered

Hello @Indiafoxtecho

What's your max_vertical_speed_ref parameter set to in the AUTOPILOT section of the systems.cfg?

I tested the Cessna citation and I am able to reach 9900 fpm as defined in its cfg file.

Regards,
Sylvain

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Indiafoxtecho avatar image
Indiafoxtecho answered Indiafoxtecho commented

Values seem OK. I should have mentioned that the behavior above is in ALT HOLD mode (not in V/S hold mode) - in which I still expect the pilot to be able to set the desired max VS...

max_vertical_speed_ref=9900

min_vertical_speed_ref=-9900

...not sure what is wrong in this case.


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FlyingRaccoon avatar image FlyingRaccoon ♦♦ ·

Ok. I've checked several Asobo aircraft but I can't find one that lets you adjust the VS while the ALT HOLD mode is engaged (the VSpeedREF will stay at 0). I've also checked the Marketplace version of your aircraft but can't see any VS setting while in ALT HOLD mode. Some particular repro steps needed? A feature you're working on?


If so, unless you have identified an Asobo aircraft that produces the same behavior, could you provide me with the package of your aircraft?

Regards,
Sylvain

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CodenameJack447 avatar image CodenameJack447 FlyingRaccoon ♦♦ ·


You don't need a plane that had wheels or knobs to handle vertical speed, just binding the vs+ and vs- events on a keyboard along with alt hold is enough. What IFT states is true, if I activate alt hold and set a target altitude, it will climb or descent at a default Vertical Speed defined in systems.cfg by default (let's say default_vertical_speed = 3000). With the vs+ /vs- events you can momentarily change the vertical speed but after a short time it returns to the default VS if you increase it over 3000ft/min. It would be necessary to activate VS hold for this to be maintained. Personally and taking advantage, some IRL planes like the f15E can dynamically change the FPM depending on the altitude they are in without VS hold. But in systems.cfg you can only define one.

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Indiafoxtecho avatar image Indiafoxtecho FlyingRaccoon ♦♦ ·
Will provide a test version of the new package as soon as it is available.
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Indiafoxtecho avatar image Indiafoxtecho FlyingRaccoon ♦♦ ·

The VS setting is a new feature of the next iteration. It is not available in the current version yet. Still, the version in the marketplace (1.0.8) has the following values:

default_vertical_speed =5000

max_vertical_speed_ref=9900

min_vertical_speed_ref=-9900

You will see that the aicraft actually uses a 3000 ft/min value in ALT HOLD mode regardless of the settings above.


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