Profile image

HELP!! PLANE TILTING BY IT SELF

13.6k brians1209  4.7 years ago

Here I made a Swedish J-35 draken. https://www.simpleplanes.com/a/ViRI40/HELP-Plane-tilting-Rolling-slowly-by-itself
It won't fly straight and it keeps tilting it's nose and banking the wing to the left side and I've changed all the airfoils and also checked all the weight balance but it won't help. PLEASE HELPPPPPP THANK YOU!!

  • Log in to leave a comment
  • Profile image
    13.6k brians1209

    @TheKraken3 *at high speed

    4.7 years ago
  • Profile image
    13.6k brians1209

    @Viper28 Thank you!

    4.7 years ago
  • Profile image
    13.6k brians1209

    @ChiChiWerx Thank you very much!

    4.7 years ago
  • Profile image
    30.3k ChiChiWerx

    @Viper28 gives only part of the answer. The root cause of “autoroll” may be a miscalculated drag model...which isn’t miscalculated at all, but simply caused by asymmetry in your build. I bet you used the mirror tool when constructing your build, did you not? The mirroring tool is to blame. When SP mirrors a part, it just spawns a part on the opposite side of your build and that part will attach itself to the closest attach points and not necessarily the attach points which are symmetric from the original side. Additionally, mirroring parts which are not the outside most parts (I.e., the last part added to a build), will frequently spawn extra parts...they’re not easy to find, but if you ever try and remove a part and suddenly you have two of them, the removed part with the original one still at the original location, you’ve found a duplicate part. The best solution for an almost completed build like yours is to disconnect each part and reattach manually to ensure all the connect points match symmetrically on each side. A simpler work around is to add a little weight on the opposite side of the autoroll in order to balance out the build...it kinda works, but it’s not a perfect solution. Avoiding the problem in the first place is really the cleanest way to prevent this, but requires a methodical approach to building. Whenever I mirror a part, I detach the original part first using the attach tool in Designer Suite, move it away from the desired location a set number of nudges (I tend to use 8 or 12 nudges), mirror that one part only, then manually reattach both parts to the correct, symmetrical attach points and nudge both parts back into position. It’s a pain and time consuming, but worth is so as to prevent autoroll.

    +1 4.7 years ago
  • Profile image
    29.2k Viper28

    Often this bug is caused by a mis-calculated drag model, causing non symmetrical drag. Try disconnecting and reconnecting the cockpit, or finding the part that is causing the problem by just looking at drag view or in the overlord menu (anything on rotors, lights, paneled nose sections, things attached directly to wings or pylons are common culprits)

    +1 4.7 years ago
  • Profile image

    is whatever controller you are using drifting or is wind on

    4.7 years ago
  • Profile image
    2,378 TheKraken3

    It works just fine, on all three physics options
    idk what's wrong

    4.7 years ago