Turnaround B's For More Combo Options?

[Jacuzzi]

How exactly do you do turnaround B's with aerials without reversing aerial momentum? I can do this fine with grounded combos (for example, DA>B-Reverse-UTilt), but with aerials, I believe I need a different input so I don't reverse my momentum. I've seen IPK do this, but don't really know how. I've tried doing it, like, Fair>Input backwards>ASC, but I can't get Lucario to turnaround. My grounded inputs are (for example) DA>B>Input backwards>Shield for a turnaround ASC, but like I said, doesn't work with aerials. What do you guys do to mixup your air combos? For something like, Fair>Turnaround ASC> Bair?

 

[Risky]

So when you reverse your momentum the input is to press within 4 frames of each other. To do a turnaround you do instead, with a very slight delay between the two.

I'd say practice it out of a fullhop without any ASC's or anything involved to make it easy. If you get a Force Palm it means you didn't wait long enough between the directional input and the B press. If you get a turnaround it's due to pressing B first.