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SESK: Stuff Everyone Should Know · sesk.info/aero-glide-ratio-meaning

What does a 20-to-1 glide ratio mean?

The aircraft travels 20 units forward per unit down.

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  1. It sinks 20 units for each unit forward
  2. It glides at 20 miles per hour
  3. It glides 20 units while descending one ✔

Why: Glide ratio compares forward distance with altitude lost. From one mile high in still air, a 20-to-1 glide would cover about 20 miles.

Huh, didn't know that: Wind changes the distance reached over the ground, even when the aerodynamic glide ratio stays the same.

The dad joke
The glider loved ratios because they helped it go the distance.
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References

Answer: It glides 20 units while descending one. Glide ratio compares forward distance with altitude lost. From one mile high in still air, a 20-to-1 glide would cover about 20 miles.

  1. Aerospace Dimensions Module 1: Introduction to Flight akwg.cap.gov/media/cms/Module_1__Intro_to_Flight_CE64D2DBD1245_e4d7f.pdf
    a mathematical relationship between the distance an aircraft will glide forward to the altitude loss
    Checked 2026-10-10.

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