What makes a shaft whippy?

[Iwishiwasrich]

My wife has the Meucci Rose cue with the original 1994 shaft and a black dot shaft that came with her Meucci Glass Rose cue.
The original has quite a bit more whip and flex than the black dot. I don't know why,I'm not a wood specialist but you can see and feel it. I believe both are 13 mm.
If you want to see some flex watch Mike Sigel break, I don't know how his shaft doesn't break

 

[garczar]

I had a few Meucci Original cues and i would never call them 'whippy' in any way. Were they more flexible than say a Joss,JW,Schon? Yes but not enough to be distracting. Look folks, just about every top player back then used a Mooch at one time or another. Never heard any say the cues were whippy. They wouldn't have used them if they were. I loved they way they hit. Wish i still had my BH-1 Rifleman, i bought it from Buddy himself at Fat Randy's in Tulsa. My next cue was a Janes Joss and it was stiffer than the mooch but not by much.