The Road to the Perfect MOI[the life and times of my composite bat]

By Trong Nguyen TEAMS Academy Baseball Bat Engineering

Table of Contents

Design Requirements Design Alternatives Final Design Prototype Problems/Errors In the End Final Project

Design Requirements

MOI: 5100 Mass: Light Center of Mass: close to the barrel Length:28.5- 31.5 inches Braiding: 4-8 braid layers and 30°-65° angles End-cap:2-5 ounces Knob:0.5-2 ounces

Design Alternatives

1. Using Model to adjust the amount of end-cap and knob.

2. Max out stats then use model to cut off parts of bat to get desired MOI.

Use the Model!

0

2000

4000

6000

8000

10000

Method 1 Method 2 (not a very

smart choice,my friends)

MOI

Final Design

Length: 30.5 inches Weight: 24 ounces Braid Layers: 8 Layers Barrel Braid Angle: 60° Handle Braid Angle: 32° End-cap: 2 ounces Knob: 2 ounces

Prototype

Length: 30.75 inches Weight: 23.80 ounces Braid Layers: 8 Average Handle Angle: 31.875° Average Barrel Angle: 58.75° End-cap:1.96 ounces Knob: 1.94 ounces

Problems/Errors

Prediction of shell weight slightly off (no biggie). Added extra 2 oz accidentally (big biggie). Had

to “Harpoon” the 2 oz. out (thanks Scott).

In the End

MOI was GREAT! Weight was NOT

GREAT!

Target Actual Percent Error

MOI 5100 5017 1.627%

Weight 24 oz 23.80 0.833%

Research Project

Goal: Investigate the MOI measurement error through experimentation

How we did it: Find MOI of three different bats (Thinh, Annelise, Linda) and look at percent error

Thinh

Thinh’s Bat Average Percent Error

Length 0.11%

Weight 0.008%

Center of Mass 0.36%

Period of Oscillation 0.42%

MOI@6 1.36%

Linda

Linda’s Bat Average Percent Error

Length 0.19%

Weight 0.001%

Center of Mass 0.24%

Period of Oscillation 0.67%

MOI@6 1.35%

Annelise

Annelise’s Bat Average Percent Error

Length 0.20%

Weight 0.01%

Center of Mass 1.01%

Percent of Oscillation 0.58%

MOI@6 0.33%

Conclusion

The Period of Oscillation consistently has the highest rate of error of all measurements in finding MOI.

It is because of human error.

Thank you!

To Dr. Jumper, Mr. Doherty, Mr. Drain, Konstantine, and everyone who helped me make my bat.