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The phrase "able to flap fast" is correct and usable in written English.
It can be used in contexts where you are describing the capability of something or someone to flap quickly, such as in reference to birds or mechanical devices.
Example: "The hummingbird is able to flap fast, allowing it to hover in place while feeding on nectar."
Alternatives: "capable of flapping quickly" or "able to flap rapidly".
Exact(2)
Furthermore, an animal heavier than 41 kg would not be able to flap fast enough to increase its flight speed.
Albatross-like animals larger than the limit will not be able to flap fast enough to stay aloft under unfavourable wind conditions.
Similar(58)
"Chickens must be able to flap their wings; pigs need to root in the ground".
And, really, what's wrong with not being able to flap your gums for a couple minutes while you drive to the toy store?
Second, that it will be able to improve fast.
"Government must be able to move fast and decisively.
Personally, not being able to move fast enough.
(We) won't be able to drive fast enough.
Or not being able to run fast.
No. She's got to be able to run fast.
Is government able to move fast enough to accommodate innovation?
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Since I tried Ludwig back in 2017, I have been constantly using it in both editing and translation. Ever since, I suggest it to my translators at ProSciEditing.

Justyna Jupowicz-Kozak
CEO of Professional Science Editing for Scientists @ prosciediting.com