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Cause of roll reversing?

35.8k Graingy  5 months ago

As is typical I try making something and the game tells me to go screw myself.
In this case, I'm trying to make a thrust vectoring fighter with stabilators (a technology I have never been able to get to work).
While I've managed to make it airborne (with a serious offset between CoM and CoL), trying to roll while pitching causes roll to reverse direction and control to thus be lost until ceasing inputs.

Why does this happen?

Related: Why does pitching up and down often cause phantom roll? This problem has plagued me for many, many years and it's the kind of thing where if it happens I might as well give up as the craft is effectively cursed for my lack of knowledge of how it happens or how to fix it.

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    35.8k Graingy

    @elliotjuk Hm. Maybe I’ll give a look

    5 months ago
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    276 elliotjuk

    try using flat bottom airfoils. irl they're draggy but i've not noticed a difference ingame. also gives nice stall characteristics and makes up for the lack of vortex lift simulation

    edit: all else fails, you can post the plane and i'll try to fix it

    +1 5 months ago
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    35.8k Graingy

    @TheMouse I will shift engine COM, but I will not that. Unless I'm doing a ship rudder, I'd rather not muck with wings like that.

    +1 5 months ago
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    59.3k TheMouse

    If it works, it works.

    5 months ago
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    59.3k TheMouse

    @Graingy
    But I like cheating!

    5 months ago
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    35.8k Graingy

    @TheMouse Mmm nah that sounds a bit too cheaty to me tbh

    5 months ago
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    59.3k TheMouse

    @Graingy
    Absolutely no idea. However, you could try adding more lift, by setting the liftScale to 1.5 or 2. Idk just an idea.

    5 months ago
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    35.8k Graingy

    @WisconsinStatePolice Below, possibly.

    +1 5 months ago
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    35.8k Graingy

    @hpgbproductions @TheMouse ... All these years...
    Thanks, anyhow. Any idea how to avoid it for supermaneuverable aircraft, or at least without totally sacrificing all maneuverability in general?

    +1 5 months ago
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    @Graingy Ok...

    5 months ago
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    One of the devs answered the first one before, roll reverses when the wing rolling "up" stalls as aoa becomes too high, so it now has less lift than the other wing, and goes "down" instead
    Probably, the aoa during pitch only is already close to critical aoa

    +1 5 months ago
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    59.3k TheMouse

    The only time I have ever had roll reverse, is fairly recently, working on my xb-70. I made the real wings much smaller to fit inside the fuselage wings, but forgot to set them to wing-2 instead of wing-3, so they were swinging all over the place, and making roll reverse.

    5 months ago
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    59.3k TheMouse

    Idk about the first one. However, the second one is called wingtip stall. Its fairly easy to fix, just reduce the control surface for pitch. (Or, reduce its angle in overload.)

    +1 5 months ago
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    35.8k Graingy

    @TheUltimatePlaneLover it’s a general problem.
    Happens on all sorts of things, really. I have no way to know if this specific instance is due to the specific aircraft design and only resembles the common problem, or if it is the common problem.
    Also, cannot now or for quite some time.

    5 months ago
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    If possible, could I be tagged as well so I can listen/eavesdrop?

    5 months ago
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    @Graingy No promises, but I just might be able to help. Could you post unlisted and tag me?

    5 months ago
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    35.8k Graingy

    @TheMouse if you know anyone who knows the answer to this, please tag them.

    5 months ago