Pardon the silly question, but what is wow on it own? what is flutter on its own? I only ever see it as a combined speed (in)accuracy term of "wow & flutter" but that suggests wow and flutter are two different things, including the 0.1 wow and 0.1 flutter threshold cited above.
Thanks. Tried googling it, but no luck. The best guess is that wow is long-term variation (say full revolution), and flutter is short term variation (1 degree). But what are the actual definitions? Reference?

