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I am trying to animate an airplane flying a simple loop. The problem is that the airplane in my animation moves at a constant speed along the Bezier curve, whereas the speed of a real airplane would vary over time--slower on the climb and faster on the descent. Unfortunately, I cannot figure out a way to vary the speed of the airplane along the path. Maybe I set this up wrong? Can anybody help? (blend attached) Thanks. Blender 3.5.1, Windows 11

Blender project file

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    $\begingroup$ This YT video is for Blender 2.8 but the technique is the same for later versions. $\endgroup$
    – John Eason
    Jun 24, 2023 at 14:11
  • $\begingroup$ Thanks! I tried this video once before, but could not make it work. I am trying it again and now I am getting good results. Thanks again! :) $\endgroup$
    – WilburPost
    Jun 24, 2023 at 14:34
  • $\begingroup$ Good to know! :^) $\endgroup$
    – John Eason
    Jun 24, 2023 at 14:42

2 Answers 2

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The animation of your object is tied to the curve's "evaluation time" under its properties panel. By default this value expands at a linear rate, but if you right-click and select "clear keyframes" you can animate it manually.

Properties > Object Data Properties > Path Animation > Evaluation Time

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To add to Chloa's answer, if you do a CtrlP> Follow Path, it will automatically assign a Generator modifier to your curve that will determine the speed of the parented object along the curve and will prevent any keyframe on the Evaluation Time. To remove the Generator modifier, select your curve, open the Graph Editor, open the N panel, click on the Modifiers tab, close the Generator modifier (or as Chloa says, right click on the Evaluation Time and Clear Keyframes):

enter image description here

Now you can open the Object Data panel and under Path Animation you can keyframe the Evaluation Time:

enter image description here

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  • $\begingroup$ Thank you for the response. Unfortunately, when I do a Ctrl+P > Follow Path, no Generator modifier is added. I went through this with another video tutorial, but I can never get the Generator modifier to appear--Nevermind. The Generator appears in the Graph editor, not the 3D Viewport. :) $\endgroup$
    – WilburPost
    Jun 26, 2023 at 17:44

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