rotation acceleration

[Dave Johnson]

I did this kind of effect a few years back with only some minor adjustments to an expression from either Dan Ehbert’s site or AE Enhancers … I don’t recall the details so I’m sorry I can’t be more help in that way. However, I’ll make one simple suggestion that I unfortunately remembered the hard way so that it might save you the grief I went through … if you plan to have a sound track, you might want to mix it first, then build your animation to match it … sound goes a long way in selling some effects, but sound that doesn’t sync well with the visuals can also ruin otherwise good visuals.

[Paul Conigliaro]

Would you be able to use the graph editor to get a decent acceleration curve?

Also, I’d highly recommend having a propeller element that’s already blurred. Many times, motion blur in AE doesn’t exactly yield the results you might want.

What I would do is use the graph editor to get a nice acceleration curve, then possibly add a light wiggle expression to give it a little variance. Then I’d transition that into a blurred propeller with some rotation (both directions, look at some reference footage) and a high-frequency wiggle so you have more control over what the blurred propeller looks like instead of relying on the sub-frame samples in AE.

Adobe CS3, Apple FCS2
[Disclaimer: Sometimes I am an idiot and misinterpret people’s posts. I’m sorry.]

[Brian Charles]

Or use an expression for rotation. time*100 (insert value you want)

[Warren Morningstar]

Thanks Paul, Brian, and Dave. Great suggestions all. Really appreciate the help.

[Anders Hattne]

For the expression I’d tie a slider to the value so that way you can make the acceleration with the slider and once you have the speed you want you’ll need no more keyframes.

http://www.ardillamedia.com

[Steve Roberts]

I second the “blurred prop image” recommendation. AE’s motion blur might give you a spirograph effect, which you may or may not want.