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The percentages mentioned on the "Other Things to Do with Deltas" page are: the drop from Step 2 divided by the distance from the nose in Step 1 expressed as a percentage.
(Step 2/Step1) x 100
For example, if the nose-to-spreader measurement in Step 1 is 28.75 inches, and the gap from Step 2 is 4 inches, the percentage is (4/28.75)x100=13.9%.
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