A stalk roll to be mounted upon a stalk roll drive shaft of a corn harvesting header in one embodiment comprises a cylindrical shell, at least four flutes affixed to and extending radially from the cylindrical shell, wherein the flutes are arranged in a first group and a second group, wherein the first group and the second group contain an equal number of said flutes, and wherein a peripheral distance between the first group and the second group is greater than a peripheral distance between the flutes within either the first group or the second group.
1. A pair of stalk rolls to be mounted upon a corn harvesting header comprising:
a. a first stalk roll cooperatively engaged with a first stalk roll drive shaft for rotation in a first direction, said first stalk roll comprising:
i. a cylindrical shell; and,
ii. at least one group of flutes affixed to said cylindrical shell, said group of flutes extending radially from said shell along the axial length of said shell;
b. a second stalk roll cooperatively engaged with a second stalk roll drive shaft for rotation in a second direction, wherein said second direction is opposite said first direction, said second stalk roll comprising:
i. a cylindrical shell; and,
ii. at least one group of flutes affixed to said cylindrical shell, said group of flutes extending radially from said cylindrical shell along the axial length of said cylindrical shell;
c. a cornstalk slot having an infinite height and a width defined by the distance between a first and a second parallel vertical lines, wherein said first vertical line is tangent said cylindrical shell of said first stalk roll on the surface of said first stalk roll that faces said second stalk roll, and wherein said second vertical line is tangent said cylindrical shell of said second stalk roll on the surface of said second stalk roll that faces said first stalk roll; and
d. a stalk engagement gap formed in said cornstalk slot during rotation of said first and second stalk rolls, wherein said stalk engagement gap is defined as a moment in time during which none of said flutes on said first stalk roll and none of said flutes on said second stalk roll are positioned within said cornstalk slot.
2. The pair of stalk rolls according to claim 1 wherein each of said flutes on said pair of stalk rolls have a knife edge formed by a leading surface and a trailing surface, wherein each said trailing surface has a radius greater than each said leading surface.
3. The pair of stalk rolls according to claim 2 wherein each said knife edge is self sharpening.
4. The pair of stalk rolls according to claim 2 wherein each said trailing surface is coated with tungsten carbide.
5. The pair of stalk rolls according to claim 1 wherein said flutes of said first stalk roll and said flutes of said second stalk roll are non-intermeshing during rotation.
6. The pair of stalk rolls according to claim 1 wherein said flutes of said first stalk roll are non-aligned with said flutes of said second stalk roll during rotation.
7. The pair of stalk rolls according to claim 1 wherein said flutes of said first stalk roll are not oriented in the same rotational position as said flutes of said second stalk roll.
8. The pair of stalk rolls according to claim 1 wherein said flutes of said first stalk roll are offset with said flutes of said second stalk roll during rotation.
9. The pair of stalk rolls according to claim 1 wherein the radius of said flutes of said first stalk roll and the radius of said flutes of said second stalk roll are less than half the width of said cornstalk slot.