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Jan 26, 2013, 03:48 PM
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MOI and props and gimbals


A common occurrence on RCG and other forums is to to refer to rotational propeller physics as "inertia" whereas the poster really means to refer to moment of inertia. I myself am guilty of casually interchanging the terms on a regular basis but when I'm feeling like I'm in an exacting mood, I will use the correct terminology.

Moment of inertia has a few aliases/abbreviations, among them are:
  • rotational inertia
  • MOI
  • mass moment of inertia

The same misnomer is often applied to the discussion of gimbal axes where the posters are describing a gimbal axis resistance to rotation as inertia, where they actually mean to say MOI.
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