Wood-type golf club set

1. A set of wood-type golf clubs having different club-lengths, each of which has a club-length WL in inches, a toe-side crown width L1 in millimeter, an overall crown width L in millimeter, and a crown tilt angle α2 in degree which satisfy the following conditional expressions:

0.75=<{( L 1/ L )+0.01 ×WL}=< 0.95

and

−22.5=<(α2−0.65 ×WL )=<−20.5,

wherein the ratio (L1/L) of the toe-side crown width L1 to the overall crown width L is gradually increased with the decrease in the club-length.

2. A set of wood-type golf clubs having different club-lengths, each of which has a club-length WL in inches, a toe-side crown width L1 in millimeter, an overall crown width L in millimeter, and a crown tilt angle α2 in degree which satisfy the following conditional expressions:

0.75=<{( L 1 /L )+0.01 ×WL}=< 0.95

and

−22.5=<(α2−0.65 ×WL )=<−20.5,

wherein the crown tilt angle α2 is gradually decreased with the decrease in the club-length.

3. A set of wood-type golf clubs having different club-lengths, each of which has a club-length WL in inches, a toe-side crown width L1 in millimeter, an overall crown width L in millimeter, and a crown tilt angle α2 in degree which satisfy the following conditional expressions:

0.75=<{( L 1 /L )+0.01 ×WL}=< 0.95

and

−22.5=<(α2−0.65 ×WL )=<−20.5,

wherein with the decrease in the club-length, the ratio (L1/L) of the toe-side crown width L1 to the overall crown width L is gradually increased, and the crown tilt angle α2 is gradually decreased.

4. The set according to claim 1 2 , or 3 , wherein the toe-side crown width L1 is not less than 20 mm but not more than 50 mm.

5. The set according to claim 1 2 , or 3 , wherein the overall crown width L is not less than 70 mm but not more than 130 mm.

6. The set according to claim 1 2 , or 3 , wherein the crown tilt angle α2 is not less than 3 degrees but not more than 10 degrees.

7. The set according to claim 3 , wherein said wood-type golf clubs include a driver, a fairway wood and a utility wood.

8. The set according to claim 7 , wherein

the club-length WL of the driver is not less than 43.5 inches but not more than 48.0 inches,

the club-length WL of the fairway wood is not less than 39.0 inches but not more than 44.0 inches, and

the club-length WL of the utility wood is not less than 38.0 inches but not more than 42.0 inches.

9. The set according to claim 7 , wherein

a loft angle of the driver is not less than 7.5 degrees but not more than 16.0 degrees,

a loft angle of the fairway wood is not less than 11.0 degrees but not more than 26.0 degrees and

a loft angle of the utility wood is not less than 15.0 degrees but not more than 30.0 degrees.

10. The set according to claim 7 , wherein

a lie angle of the driver is not less than 55.0 degrees but not more than 62.0 degrees,

a lie angle of the fairway wood is not less than 56.0 degrees but not more than 63.0 degrees and

a lie angle of the utility wood is not less than 57.0 degrees but not more than 63.0 degrees.

11. The set according to claim 7 , wherein

a head volume of the driver is not less than 400 cc but not more than 470 cc,

a head volume of the fairway wood is not less than 100 cc but not more than 200 cc and

a head volume of the utility wood is not less than 80 cc but not more than 150 cc.

12. The set according to claim 7 , wherein

a head mass of the driver is not less than 170 g but not more than 200 g,

a the head mass of the fairway wood is not less than 180 g but not more than 240 g and

a head mass of the utility wood is not less than 200 g but not more than 260 g.

13. The set according to claim 7 , wherein a toe-side crown angle α1 is not less than 8 degrees but not more than 20 degrees.

14. The set according to claim 7 , wherein a height A of a toe-side extreme end point Q is not less than 15 mm but not more than 60 mm.

15. The set according to claim 7 , wherein a height B of a crown highest point P is not less than 25 mm but not more than 70 mm.