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BrianJ BrianJ is offline
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Default Rotating Wingnut - The Dzhanibekov Effect
by BrianJ 11-29-2019, 04:58 PM

Hi,
I saw this video about the Dzhanibekov Effect (Intermediate Axis Theorem)


I wondered if Orbiter would reproduce this rather entertaining behaviour of a wingnut rotating in space, and of course it does - very well :-)

Here's a simple .cfg, mesh and scenario of a wingnut with Prime Moments of Inertia 0.12 0.26 0.22, rotating in space with angular velocity 360deg/sec around Z axis and 0.1deg/sec around Y axis.


rotating_wingnut_191129.zip


Cheers,
Brian

Last edited by BrianJ; 11-29-2019 at 05:11 PM.
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Old 11-29-2019, 09:36 PM   #2
kuddel
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I had the exact same idea when I first saw that video, but I totally lack the skills to create any "ship" to demonstrate this.

Very many thanks for putting this up!
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Old 11-30-2019, 12:29 PM   #3
Urwumpe
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I wonder what martins would be doing now, if he got one € every time this behavior was reported as a bug.
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Old 11-30-2019, 12:42 PM   #4
Face
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Quote:
Originally Posted by kuddel View Post
 I had the exact same idea when I first saw that video, but I totally lack the skills to create any "ship" to demonstrate this.

Very many thanks for putting this up!
I second that. Many thanks for the link, it is a very good explanation!

I caught myself wondering if Orbiter's behavior in this regards is really correct in the past as well. I noticed this with e.g. the Deltaglider, and if I'm not mistaken, Martin even got some question on this and explained it in mathematical terms.
But I have to admit that only after seeing the above video I really grasp it.

---------- Post added at 13:42 ---------- Previous post was at 13:38 ----------

It is even in the stock scenarios: "Delta-glider/The rotation model"
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