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An assembly for processing wood chips with a novel blade profile allows wood chips to be packed great density. The profile may be a stepped profile with a plurality sections forming a rotationally forward face. Neighboring sections are non-collinear and at least one of the sections is parallel to a

An assembly for processing wood chips with a novel blade profile allows wood chips to be packed great density. The profile may be a stepped profile with a plurality sections forming a rotationally forward face. Neighboring sections are non-collinear and at least one of the sections is parallel to a rotational axis. The profile may include a generally centrally disposed first section of ≧¼ of a relevant dimension; a third section of ≧⅛ of the relevant dimension; a second section disposed between the first section and a third section and non-collinear with the third section; with the sections disposed relative to the rotational axis in advantageous positions. The profile may be such that second and third sections of the blade have approximately equal longitudinal extents, but the tilt-angle-weighted surface area of the second section is substantially less than the third tilt-angle-weighted surface area of the third section.

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What is claimed is: 1. An assembly for processing wood chips, comprising: a drum disposed so as to rotate about a generally horizontal longitudinal axis, said drum comprising a central core and at least first and second blades extending outwardly from said core and circumferentially spaced from one

What is claimed is: 1. An assembly for processing wood chips, comprising: a drum disposed so as to rotate about a generally horizontal longitudinal axis, said drum comprising a central core and at least first and second blades extending outwardly from said core and circumferentially spaced from one another; said drum having a longitudinal length; a motor operatively connected to said drum and supplying rotational power thereto; and said first blade having a stepped blade profile with a plurality sections forming a rotationally forward face, with neighboring sections being non-collinear and at least one of said sections being disposed generally parallel to said axis. 2. The assembly of claim 1 wherein at least two of said sections are parallel. 3. The assembly of claim 1 wherein said blade profile varies discontinuously in blade axial tilt angle. 4. The assembly of claim 1 wherein said drum has a width measured in a direction parallel to said axis, and wherein said blades each extend substantially across said width of said drum. 5. The assembly of claim 1 wherein said second blade has a blade profile similar to said blade profile of said first blade. 6. The assembly of claim 1 wherein said blade profile comprises a first section having a first centerpoint, a second section having a second centerpoint, and a third section disposed having a third centerpoint; wherein said second section is disposed between said first and third sections both along said axis and rotationally. 7. The assembly of claim 6 wherein, in radial view, said third centerpoint is disposed away from a line containing said second centerpoint and the closest point of said second section to said first section. 8. The assembly of claim 6 wherein in a cross-sectional view taken perpendicular to said axis a second theoretical line extends from said axis to said second centerpoint; wherein a first theoretical line extending from said axis to said first centerpoint forms a forward angle to said second line; and wherein a third theoretical line extending from said axis to said third centerpoint forms a rearward angle to said second line. 9. The assembly of claim 6 wherein said first blade further comprises a fifth section disposed rotationally rearward and a fourth section disposed between said first and fifth sections both along said axis and rotationally. 10. The assembly of claim 9 wherein said first, third, and fifth sections are disposed substantially parallel to said axis. 11. The assembly of claim 10 wherein said second and fourth sections are non-parallel to said axis. 12. The assembly of claim 9 wherein a tilt-angle-weighted surface area of said third section plus a tilt-angle-weighted surface area of said fifth section approximately equals a tilt-angle-weighted surface area of said first section. 13. The assembly of claim 6 wherein said first section is disposed rotationally forward relative to said second section. 14. The assembly of claim 6 wherein said first blade is mounted to a first drum core facet having a forward facet joint with a relatively leading facet and a rear facet joint with a relatively trailing facet, and wherein said first centerpoint is disposed proximate said forward facet joint. 15. The assembly of claim 14 wherein said third section extends proximate said rear facet joint generally parallel to said axis. 16. The assembly of claim 1 further comprising a container for receiving said wood chips leaving said drum. 17. The assembly of claim 1: wherein at least two of said sections are parallel; wherein said drum has a width measured in a direction parallel to said axis, and wherein said blades each extend substantially across said width of said drum; wherein said second blade has a blade profile similar to said blade profile of said first blade; wherein said blade profile comprises a first section having a first centerpoint, a second section having a second centerpoint, and a third section disposed having a third centerpoint; wherein said second section is disposed between said first and third sections both along said axis and rotationally; wherein, in radial view, said third centerpoint is disposed away from a line containing said second centerpoint and the closest point of said second section to said first section; wherein said first blade further comprises a fifth section disposed rotationally rearward and a fourth section disposed between said first and fifth sections both along said axis and rotationally; wherein said first section is disposed rotationally forward relative to said second section; and wherein said first blade is mounted to a first drum core facet having a forward facet joint with a relatively leading facet and a rear facet joint with a relatively trailing facet, and wherein said first centerpoint is disposed proximate said forward facet joint. 18. The assembly of claim 17 wherein a tilt-angle-weighted surface area of said third section plus a tilt-angle-weighted surface area of said fifth section approximately equals a tilt-angle-weighted surface area of said first section. 19. An assembly for processing wood chips, comprising: a drum disposed so as to rotate about a generally horizontal longitudinal axis, said drum including a central core and at least first and second blades extending outwardly from said core and circumferentially spaced from one another; a motor operatively connected to said drum and supplying rotational power thereto; said first and second blades comprising respective first, second, and third sections, said first section being generally centrally disposed and having a longitudinal extent that is at least ¼ of a length of said core; said second section disposed between said first section and said third section and non-collinear with said third section; said third section having a longitudinal extent that is at least ⅛ of said length of said core; wherein, when viewed in cross section normal to said axis: an average position of said second section is disposed approximately vertically aligned with said axis; an average position of said first section is disposed a first of rotationally forward or rotationally rearward of said axis; and an average position of said third section is disposed the other of rotationally forward or rotationally rearward of said axis. 20. The assembly of claim 19 wherein said average position of said first section is disposed rotationally forward of said axis. 21. The assembly of claim 19 wherein said first and second blades further comprise a fifth section and a fourth section disposed between said first and fifth sections both along said axis and rotationally; said fifth section disposed generally opposite said third section relative to said first section. 22. An assembly for processing wood chips, comprising: a drum disposed so as to rotate about a generally horizontal longitudinal axis, said drum including a central core and at least first and second blades extending outwardly from said core in spaced relation to each other; a motor operatively connected to said drum and supplying rotational power thereto; said first and second blades having respective first, second, and third sections, said first section being generally centrally disposed relative to a longitudinal length of said core, said second section disposed longitudinally between said first section and said third section; said second and third sections having approximately equal longitudinal extents relative to said axis; wherein a second tilt-angle-weighted surface area of said second section is substantially less than a third tilt-angle-weighted surface area of said third section. 23. The assembly of claim 22 wherein said second tilt-angle-weighted surface area is substantially less than a first tilt-angle-weighted surface area of said first section. 24. The assembly of claim 23 wherein said first tilt-angle-weighted surface area is larger than said third tilt-angle-weighted surface area.