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Where can I find nice flutter animations/videos (other than YouTube) to add to a presentation without violating Copyright regulations ? It can either be for wings as well as blade arrays.

Are you aware of any OpenSource database on this topic ?

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YouTube is really your best bet - is there any reason you wouldn't be able to use one of the many NASA videos?

If you need a release for legal reasons NASA is famously liberal about granting rights to their research/educational videos - just contact then and you'll almost certainly get an official "Sure, you can use it!"

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