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The value of a beaten length is dependent on the speed (time) and distance. So it actually does vary, particularly in the last fractions as they vary the most.
Like the Doc said it doesn't make any different what you use as long as all horses are treated the same. 10 foot was used for many years and in Brohammer's book because it made the math easier. The actual length of a horse is closer to 8 foot(average) as some are longer.
To the best of my knowledge Doc was using 2 foot per 1/2 furlong in later programs. As he said mathematically as long as all are treated the same its a mute discussion.
Mitch44
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