Demarini Vendetta Bat

[Kevin Finnerty]

I can't wait to let a kid use one.

[jkumpire]

The New York State Baseball Umpires Assn has posted a notice on their web site saying the message is from FED.

Kevin, the bat is so expensive, some schools and parents may buy it and then not let anyone use it at that price.

[Dave Reed]

Well, it's a little slow here on a Friday night, so.....

A couple of pages back, dash_riprock suggested that adding holes to the Reebok bat was silly. MTD. Sr. took him to task, asserting that dash hadn't learned fluid mechanics. dash invited MTD to provide a calculation of drag, but instead got a (wrong) explanation of ball-bat collisions.

Dash was right-- there is little benefit to adding holes to the bat handle. The drag on a cylinder is proportional to the area times the velocity squared. Since the handle moves roughly at 1/3 the speed of the barrel, and the area is perhaps 1/10 that of the barrel, in rough terms the air resistance of the handle is about 1% that of the barrel. Reducing that 1% to perhaps 0.8% is a very small effect.

And the ball-bat collision stuff? MTD starts with the assertion that the collision is elastic. But it isn't. A baseball has a coefficient of restitution of around 0.45 at typical collision velocities, and is limited by rule to 0.565 at 60 mph (less than bunting speed). All the subsequent discussion of conservation of energy and momentum, and sums of velocities is inappropriate for inelastic ball-bat collisions.

Finally, this assertion: "The mass of the bat is much greater that the mass of the ball and it only takes a small increase in a bat's velocity to greatly effect the amount of momentum transfered from the bat to the ball." is way wrong.

If the collision were elastic, a 1 mph increase in bat speed would give a 2 mph increase in ball exit speed. But since the COR is about 1/2, the actual effect is 1 mph in bat speed gives about 1 mph in ball exit speed.

[UmpJM]

Originally Posted by Dave Reed

Well, it's a little slow here on a Friday night, so.....

A couple of pages back, dash_riprock suggested that adding holes to the Reebok bat was silly. MTD. Sr. took him to task, asserting that dash hadn't learned fluid mechanics. dash invited MTD to provide a calculation of drag, but instead got a (wrong) explanation of ball-bat collisions.

Dash was right-- there is little benefit to adding holes to the bat handle. The drag on a cylinder is proportional to the area times the velocity squared. Since the handle moves roughly at 1/3 the speed of the barrel, and the area is perhaps 1/10 that of the barrel, in rough terms the air resistance of the handle is about 1% that of the barrel. Reducing that 1% to perhaps 0.8% is a very small effect.

And the ball-bat collision stuff? MTD starts with the assertion that the collision is elastic. But it isn't. A baseball has a coefficient of restitution of around 0.45 at typical collision velocities, and is limited by rule to 0.565 at 60 mph (less than bunting speed). All the subsequent discussion of conservation of energy and momentum, and sums of velocities is inappropriate for inelastic ball-bat collisions.

Finally, this assertion: "The mass of the bat is much greater that the mass of the ball and it only takes a small increase in a bat's velocity to greatly effect the amount of momentum transfered from the bat to the ball." is way wrong.

If the collision were elastic, a 1 mph increase in bat speed would give a 2 mph increase in ball exit speed. But since the COR is about 1/2, the actual effect is 1 mph in bat speed gives about 1 mph in ball exit speed.

Oddly, I think I actually understood (sorta' ) what Dave Reed said here, and found his argument compelling.

Nicely done.

JM

[Emperor Ump]

We got this in an email from our state high school association dated 2/6:

Rule- Compliant Bats

The following bats are compliant for use in VHSL contests:

The Mattingly Bat
The Demarini Vendetta
The Reebok Vector O

This will also be sent in Weekly Update.

So in a week and a half they have changed their minds from the state clinic where they spent a few minutes talking about the bats and even brought in the Vendetta so we all knew what it looked like.

Give it a few weeks and it will change again.

[Tim C]

I received the following e-mail from Eliot Hopkins of the NFHS today. The NFHS sent this e-mail to all SRIs in all FED states baseball programs.

The following bats are deemed LEGAL for use by the NFHS:

1) DeMarini Vendetta
2) Reebok Vector O
3) NIKE Aero Fuse

This pretty much closes the book in Oregon.

Regards,

[Steven Tyler]

Originally Posted by Tim C

I received the following e-mail from Eliot Hopkins of the NFHS today. The NFHS sent this e-mail to all SRIs in all FED states baseball programs.

The following bats are deemed LEGAL for use by the NFHS:

1) DeMarini Vendetta
2) Reebok Vector O
3) NIKE Aero Fuse

This pretty much closes the book in Oregon.

Regards,

Don't forget about the Mattingly bat. It is also legal for use in FED.

[ozzy6900]

Originally Posted by Tim C

I received the following e-mail from Eliot Hopkins of the NFHS today. The NFHS sent this e-mail to all SRIs in all FED states baseball programs.

The following bats are deemed LEGAL for use by the NFHS:

1) DeMarini Vendetta
2) Reebok Vector O
3) NIKE Aero Fuse

This pretty much closes the book in Oregon.

Regards,

Which is what I stated in my original post. What I do not understand, Tim, is how can a State change this rule?

[TxUmp]

Originally Posted by Tim C

I received the following e-mail from Eliot Hopkins of the NFHS today. The NFHS sent this e-mail to all SRIs in all FED states baseball programs.

The following bats are deemed LEGAL for use by the NFHS:

1) DeMarini Vendetta
2) Reebok Vector O
3) NIKE Aero Fuse

This pretty much closes the book in Oregon.

Regards,

When I check the NFHS site, #3 is not listed. Did you get a different memo that what is posted on the NFHS site? Is NFHS deliberately trying to muddy the waters?

[johnnyg08]

so basically we're still looking for the BESR stamp right?

[Rich Ives]

So does anyone really know if the state reps were acting on their own in the initial assessment or did FED really cross them up?

[Tim C]

The memo I was sent had an added paragraph that spoke directly to the NIKE bat.

My post kind of truncated that process.

Sorry.

TC

Here is exactly what I was sent:

Peter Weber of the OSAS sent Eliot an e-mail that was in association with my question concerning bats.

From Peter Weber Associatied Director of The Oregon School Activities Assocaiton (Baseball Coordinator). The memo was adressed to him and copied to me.

Please share this information with your staff, schools and baseball officials. The following baseball bats have been found rule-compliant by the NFHS for use in high school baseball:

1. DeMarini Vendetta

2. Reebok Vector O

"I also asked him about the Nike Aero Fuse and he said that was a legal bat." Weber quote.

[Kevin Finnerty]

BESR stamp is there, kid gets to use it in my game. I won't ask any questions and the unit president or instructors hasn't covered in the meetings. BESR stamp=good enough for me. Let the hitter think it's helping him hit. It isn't.