High Speed Test Results

1
High Speed Test Results

• ASA Equipment Testing Certification Committee
• Oklahoma, OK April 5-6, 2003
• Lloyd Smith, Ph.D., P.E.

2
High Speed Test

• 110 mph inbound ball speed
• Measure inbound and rebound ball speed
• BBS from 85 mph swing speed and 25 mph pitch
  speed
• Center of rotation 2.6 inches from knob
• Scale swing speed with bat MOI
• Scan bat every inch to find maximum BBS

3
New Swing Speed Formula
dimpact location from knob
4
Preliminary High Speed Data

• All tests used a pitch speed of 110 mph
• WSU
• measured ball-in and ball-out
• used 44/375 ball, conditioned at 50 RH
• NYU
• measured ball-in and bat-out
• used 47/525 ball
• normalized BBS with ball COR

5
BBS from Era Study (WSU)
6
Era Study (NYU)
7
BBS vs. BPF
8
High speed test vs. ASTM 1890
9
Ball Compression
10
Ball Conditioning
11
Summary

• Current BBS of 85 mph (125 ft/s) not realistic
• Field observations of high performance bats
  captured in high speed test