Bat Design Final Report

Alison Welch

Design ObjectivesTargets:

Shell MOI: 3400

Final MOI: 5700

Other Parameters

Layers: 6

Avg. Braid Angles: Handle- 50° Barrel- 60°

Epoxy Resin

Length: 29.5 in

Design ProcessI came to these design parameters by comparing

the data of previously completed bats. I found that my MOI could be reached one of two ways:

6 layers and high braid angle

8 layers and a mid to low braid angle

I chose the 6 layer option because I found that it is hard to get the resin to penetrate the fibers fully 8 layer bats.

ResultsActual Parameters

Layers: 6

Length: 29.75 in

Avg. Braid Angles: Handle- 49.3° Barrel- 61°

End-cap weight: 4.3 ounces

Knob weight: 2.7 ounces

Shell MOI: 3431 – 7.2% deviation

Final MOI: 5838 – 2.4% deviation

ConclusionsPossible Sources of Error

Braid Angle Deviation

End-cap Weight

Length of Final Bat

In order to better reach my target I could have worked more with my model to accurately represent the effect of braid angle on the density of the bat.

Group Bat ProjectProject Number 4

MOI Measurement Error Using Experimental Evaluation

Process:

Each person in the group seprately measured the length, weight, CG, and period oscillation for each of 3 completed bats. The MOI was then calculated from each set of data and compared.

Data

Data

Data

ConclusionsThe largest variations in the data were between

the period and center of gravity measurements. However minimal these variations are, they caused slightly larger variations in the MOI. This is because of the formula used.

W*(L-CG-6)*(386*t2/4π2)

Mark and Ryan analyzed the amount of MOI deviation that is caused by a change in each parameter.