high speed test results
DESCRIPTION
High Speed Test Results. ASA Equipment Testing & Certification Committee Oklahoma, OK April 5-6, 2003 Lloyd Smith, Ph.D., P.E. 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 - PowerPoint PPT PresentationTRANSCRIPT
High Speed Test Results
ASA Equipment Testing & Certification CommitteeOklahoma, OK April 5-6, 2003
Lloyd Smith, Ph.D., P.E.
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
New Swing Speed Formula
25.029000
5.30
5.285
I
inoz
in
indmphVbat
d=impact location from knob
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
BBS from Era Study (WSU)
80
85
90
95
100
105
110
Wood
Wood
early
70's
alum
inum
early
70's
alum
inum
Basic
Single W
all
Basic
Single W
all
Good
SP Bat
Doublew
all T
echo
nology
High P
erfo
rming
Alum
inum
High P
erfo
rming
Alum
inum
High p
erfo
rming
Com
posit
e ba
t
Very h
igh p
erfo
rmin
g multi-
wall ba
t
Very h
igh p
erfo
rmin
g com
posit
e bat
Very h
igh p
erfo
rmin
g com
posit
e bat
Very h
igh p
erfo
rmin
g com
posit
e bat
BB
S (
mph
)
Era Study (NYU)
90
92
94
96
98
100
102
104
Wood
Aluminu
m
Mult
i-wall
Mult
i-wall
Mult
i-wall
Mult
i-wall
Mult
i-wall
Mult
i-wall
Composite
Composite
Composite
Composite
BB
S (
mph
)
BBS vs. BPF
1.1
1.15
1.2
1.25
1.3
1.35
1.4
94 96 98 100 102 104
BBS (mph)
BP
F
High speed test vs. ASTM 1890
80
85
90
95
100
105
110
Dou
blew
all
Tec
hono
logy
Hig
hP
erfo
rmin
gA
lum
inum
Ver
y hi
ghpe
rfor
min
gco
mpo
site
BB
S (
mph
)
High Speed Test
ASTM Test
Ball Compression
94
96
98
100
102
104
106
108
110
112
114
375 lb 525 lb
BB
S (
mph
)
Ball Conditioning
0.44 COR, 375 lb balls30% to 50% RH
0
0.2
0.4
0.6
0.8
1
1.2
1.4
0 50 100 150 200
Time (min1/2)
We
igh
t C
ha
ng
e (
%)
9 days
Summary
• Current BBS of 85 mph (125 ft/s) not realistic
• Field observations of high performance bats captured in high speed test