# Glide Ratio

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EmilyB.Glide Ratio
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446d5374-608b-11e6-9770-bc764e2038f2

The Glide Ratio calculator computes the glide ratio based on the change in forward distance and the change in altitude.

INSTRUCTION: Choose units and enter the following:

• (ΔS)  This is the forward distance traveled.
• (ΔH)  This is the change in altitude.

Glide Ratio (ε): The calculator returns the Glide Ratio as a real number.

#### The Math / Science

The Glide Ratio is the ratio of distance forward to distance downwards when a glider is flown at a constant speed in still air. The glide ratio varies with air speed, but there is a maximum value which is frequently quoted. Glide ratio usually varies little with vehicle load; a heavier vehicle glides faster, but nearly maintains its glide ratio.

The following formula is used:

ε = ΔS / ΔH

where:

• ε = Glide Ratio
• ΔS = distance of forward travel
• ΔH = altitude change in forward travel