GOLF BALL
A golf ball is disclosed herein that has a specific set of aerodynamic characteristics and construction parameters.
1 . A golf ball comprising at least a core, a casing layer, and a cover,
the core having a weight (W core ) of at least 1.245 ounces, a coefficient of restitution (COR core ) of at least 0.785, and a diameter (D core ) of at least 1.525 inches;
the cover comprising a plurality of dimples arranged in a dimple pattern having a drag coefficient (C D ) and a lift coefficient (C L ), such that:
0.230≤C D1 ≤0.250 at a Reynolds number of 220,000 and a spin ratio of 0.070,
0.230≤C D2 ≤0.250 at a Reynolds number of 160,000 and a spin ratio of 0.095, and
0.230≤C D3 ≤0.250 at a Reynolds number of 120,000 and a spin ratio of 0.100;
the dimple pattern has an integrated drag area (DA) defined by:
DA
=
∫
1
6
0
,
0
0
0
2
25
,
000
C
D
(
Re
)
d
Re
where C D (Re) is established at a launch condition of a golf ball speed of 182.0 mph, a launch angle of 10.0 degrees, and a spin rate of 2,700 rpm, such that 14,500≤DA≤15,500; and
the golf ball having a coefficient of restitution (COR ball ) and an initial velocity (IV ball ) (in feet/second), such that a Speed Factor (S) is defined by the following equation:
S
=
9
0
2
.
6
7
+
8
1
4
.
6
3
(
COR
ball
)
-
5
.
4
4
(
IV
ball
)
,
wherein
S
≥
1
8
1
.
2 . The golf ball according to claim 1 , wherein the Speed Factor (S) is at least 183.
3 . The golf ball according to claim 1 , wherein the Speed Factor (S) is 182-185.
4 . The golf ball according to claim 1 , wherein 14,500≤DA≤15,250.
5 . The golf ball according to claim 1 , wherein 14,750≤DA≤15,500.
6 . The golf ball according to claim 1 , wherein CD 1 ≤0.245; CD 2 ≤0.245; and CD 3 ≤0.245.
7 . The golf ball according to claim 1 , wherein CD 1 ≤0.240; CD 2 ≤0.240; and CD 3 ≤0.240.
8 . The golf ball according to claim 1 , wherein the dimple pattern is comprised of 220-270 dimples, with a surface coverage of 77.0%-83.0%, and a dimple volume of 0.0400 in 3 -0.0575 in 3 .
9 . The golf ball according to claim 1 , wherein the dimple pattern is comprised of 340-390 dimples, with a surface coverage of 80.0%-85.0%, and a dimple volume of 0.0350 in 3 -0.0425 in 3 .
10 . The golf ball according to claim 1 , wherein the dimple pattern is comprised of 280-420 dimples, with a surface coverage of 70.0%-81.0%, and has a maximum dimple diameter disparity of not greater than 0.040 inches.
11 . The golf ball according to claim 1 , wherein the dimple pattern is comprised of 270-320 dimples, with a surface coverage of 76.0%-85.0%, and a dimple volume of 0.0350 in 3 -0.0440 in 3 .
12 . The golf ball according to claim 1 , wherein the dimple pattern is comprised of 490-620 dimples, with a surface coverage of 79.0%-85.0%, and a dimple volume of 0.0175 in 3 -0.0375 in 3 .
13 . The golf ball according to claim 1 , wherein the dimple pattern is comprised of 390-490 dimples, with a surface coverage of 77.0%-86.0%, and a dimple volume of 0.0225 in 3 -0.0450 in 3 .
14 . The golf ball according to claim 1 , wherein the core weight (W core ) is at least 1.260 ounces, the core coefficient of restitution (COR core ) is at least 0.770, and the core diameter (D core ) is at least 1.530 inches.
15 . The golf ball according to claim 1 , wherein the core weight (W core ) is at least 1.280 ounces, the core coefficient of restitution (COR core ) is at least 0.785, and the core diameter (D core ) is at least 1.545 inches.
16 . The golf ball according to claim 1 , wherein the golf ball has a Flight Factor (F) defined by the following equation:
F
=
DA
×
W
core
×
D
core
×
(
C
D
1
+
C
D
2
+
C
D
3
)
IV
ball
×
COR
ball
×
COR
core
wherein the Flight Factor (F) is at least 120.
17 . The golf ball according to claim 16 , wherein the Flight Factor (F) is 120-160.
18 . The golf ball according to claim 16 , wherein the Flight Factor (F) is 125-140.
19 . The golf ball according to claim 16 , wherein a ratio of the Flight Factor (F) to the Speed Factor (S) is 0.600-0.750.
20 . The golf ball according to claim 1 , wherein C L ≥0.115 at a Reynolds number of 240,000 and a spin ratio of 0.060, and
the drag coefficient and the lift coefficient at a Reynolds number of 225,000 and a spin ratio of 0.070 have the following relationship: 1.400≤C D /C L <2.000.