Dinger Exit Velocity

[radness]

Exit velocity proves pitchers provide minimal power to long balls

Timing and squaring up the ball are of utmost importance for a hard-hit ball.

www.usatoday.com

 

[_MIA_]

View attachment 27137

Exit velocity proves pitchers provide minimal power to long balls

Timing and squaring up the ball are of utmost importance for a hard-hit ball.

www.usatoday.com

View attachment 27138

I think it is a bit higher of a percentage due to the bats. The equation is

EV=q*Vp+(1+q)*Vb

where Vp and Vb are pitch and bat velocity respectively and q takes into account the collision physics due to the bat and ball. q is 0.2 for a wood bat and something like 0.3 for a composite bat.

 

[Lancer_dad]

View attachment 27137

Exit velocity proves pitchers provide minimal power to long balls

Timing and squaring up the ball are of utmost importance for a hard-hit ball.

www.usatoday.com

View attachment 27138

Interesting. I wonder though if the use of composite bats with their higher compression and the inherent trampoline effect, changes that number for fastpitch vs wood baseball bats?

 

[radness]

Lots of little details that might be marginal or more than marginal. Those were just some quick Google searches.

 

[radness]

I think it is a bit higher of a percentage due to the bats. The equation is

EV=q*Vp+(1+q)*Vb

where Vp and Vb are pitch and bat velocity respectively and q takes into account the collision physics due to the bat and ball. q is 0.2 for a wood bat and something like 0.3 for a composite bat.

How about size/weight of the ball difference?

 

[Rolling Hard]

I think it is a bit higher of a percentage due to the bats. The equation is

EV=q*Vp+(1+q)*Vb

where Vp and Vb are pitch and bat velocity respectively and q takes into account the collision physics due to the bat and ball. q is 0.2 for a wood bat and something like 0.3 for a composite bat.

If q for a wood bat is .2 then a composite has to be at least double or qqq.

 

[Tazman]

I think it is a bit higher of a percentage due to the bats. The equation is

EV=q*Vp+(1+q)*Vb

where Vp and Vb are pitch and bat velocity respectively and q takes into account the collision physics due to the bat and ball. q is 0.2 for a wood bat and something like 0.3 for a composite bat.

Super interesting. What's the reason it's only q on the pitch vs 1+q on the bat velocity? Intuitively I would have thought it would be q(Vp+Vb) but that's probably why I decided against being an engineer. Seems like on a perfect swing they would contribute equally though clearly that's not the case and I suspect the equation isn't accounting for a lower probability of hitting a faster pitch perfectly.

 

[_MIA_]

Super interesting. What's the reason it's only q on the pitch vs 1+q on the bat velocity? Intuitively I would have thought it would be q(Vp+Vb) but that's probably why I decided against being an engineer. Seems like on a perfect swing they would contribute equally though clearly that's not the case and I suspect the equation isn't accounting for a lower probability of hitting a faster pitch perfectly.

q is called the collision efficiency and relates the ball speed before (eg pitch speed) and after (eg exit velocity) collision. This can be measured for different bats,balls and contact locations. The physics (see http://baseball.physics.illinois.edu/AJP-Nov2000.pdf) that goes into this number is somewhat complicated and takes into account the inelasticity of the collision. A good portion of the initial (before contact) ball and bat energy gets dissipated into heat during the collision. As mentioned in the article I linked below, this number is weakly dependent on the relative velocity between the pitch velocity and bat velocity so one can assume it won't change a lot for different batters/pitchers and only really depends on the ball and bat used for a given contact location on a bat. The number I quoted for a wood bat (q=0.2) is for contact on the sweet spot.

The q vs 1+q simply comes from the fact that the exit velocity for the ball is in the opposite direction as the pitch velocity but in the same direction as the bat velocity. See page 2 of the below article

http://baseball.physics.illinois.edu/AJP-Feb2003.pdf

 

[Rolling Hard]

Do some math on this one. Ball travels an estimated 250 ft.

 

[LEsoftballdad]

Do some math on this one. Ball travels an estimated 250 ft.

That looked like a half swing.