Talk:Principal axis (mechanics)
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Merge proposal
editThis article is mostly about yaw, pitch and roll, which are already described at yaw, pitch and roll and aircraft principal axis. The prinicipal axes are treated as a subtopic at Moment_of_inertia#Principal_moments_of_inertia, which I think is where they belong -- I don't think there's a need for a separate article for the principal axes as opposed to the principal moments. (Also, though this wouldn't be a reason by itself to merge the article, it's a stub with errors -- the principal moments are stationary, not maximal or minimal, and "axis" should be "axes".) So I think this should ultimately become a section redirect to Moment_of_inertia#Principal_moments_of_inertia. (I also just redirected spherical top, symmetric top and symmetrical top to that section.) Joriki (talk) 15:31, 4 March 2010 (UTC)
- Hi Joriki. I have found your merge proposal in the Yaw, pitch and roll page. I would keep separated both articles because the word yaw can be used to refer to an angle or to a rotation around the vertical axis. Notice that when yaw refers to an angle its variation is a precession, not a yaw movement. Therefore it has to be considered a polysemic word and be treated in consequence.
- About the other proposed merge, Aircraft principal axes, I agree that should be merged here, but with care, because sometimes principal axis means one of the inertia tensor eigenvectors and other times it means a symmetry axis (regardless of the mass distribution).
- Regards, --Juansempere (talk) 18:39, 5 March 2010 (UTC)
Partial merge done
editI have merged Principal axis (mechanics) into Moment of inertia#Principal axes of inertia. The first article was only two lines long and I think there is no reason to keep an article like that. The merge was just a copy and paste. The rest of the merge is not so easy and should be discussed first how to do it. --Juansempere (talk) 10:11, 7 March 2010 (UTC)
- I've tried to merge the text in to Moment of inertia#Principal axes of inertia a bit better than cut-and-paste. It looks to me like all of the material from the old article is covered in one of the other three, so as far as I can see the merge is completed. Djr32 (talk) 19:00, 7 March 2010 (UTC)