Vx and Vy and commercial a/c

[JIC]

Hi

I been wondering quiet a while now about what and how Vx and Vy is used on a commercial a/c.

I am flying ATR and really can't find anything about it in the FCOM's or AFM and the performance books I have been reading tells me that Vx is Vmd on the thrust curve or max excess thrust. Vy is Vmp or max excess power. But how do I find them on my ATR? Do we call them something different on a "big" aeroplane (CS-25)?

Anyone who can give me a hint or maybe have some good links to where I can read more about this?

Thanks

Best Regards Jic.