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05-18-2009, 03:52 PM
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This is an excerpt from a website I found that answers these things.

See the math involved. As an example, let's look at the 1/4 inch hollow. This is used for a good skater weighing 55 pounds. The depth of the groove down the middle of the blade (the hollow) will be 0.0073 inches. In plain English, one would call this about seven thousandths of an inch. Not very deep, but that's all that is needed.

Weight (Lbs) Hollow (inches) Depth (inches)

55 1/4 0.0073
85 3/8 0.0048
125 1/2 0.0036
150 5/8 0.0029
165 3/4 0.0024
185 7/8 0.0021
Goalies should add 3/8" to the hollow listed above.

Radius and rocker - The bottom of a hockey skate blade, as seen from the side, is curved at the front and back, and the center is mostly flat:


Hockey skaters have found it desirable to put a radius on the bottom of the blade to improve maneuverability. The radius is specified in feet and it is usually selected based on the skater's height. The process of putting a radius on a skate blade is called profiling. With profiled blades only part of the blade touches the ice at any one time. The smaller the radius, the less blade touches the ice, and the easier it is to turn. However, with less blade touching the ice, you will lose speed and stability. That is why speedskates are long and flat, with much blade on the ice. Imagine your hockey blade is part of the circumference of a very large circle. The radius of this large circle is the number quoted to describe the profile of the blade. Below is a chart of suggested profiles vs. a player's height.

Height Radius
4' 3" 6'
4' 7" 7'
4' 11" 8'
5' 3" 9'
5' 7" 10'
5' 11" 11'
6' 3" 12'
6' 7" 13'

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