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PA.IV.E.K2FAA-S-ACS-6C · Nov 2023Knowledge

Best angle of climb speed (VX) and best rate of climb speed (VY).

ACS element text (the applicant demonstrates understanding of)

Best angle of climb speed (VX) and best rate of climb speed (VY).

Bottom line

VY is the best rate-of-climb speed: this airspeed provides the most altitude gain in a given period of time. VX is used during a short-field takeoff to clear an obstacle.

FAA references

  1. AFH Glossary (p. G-18) — FAA-H-8083-3C
  2. PHAK ch. 11 (p. 11-7) — FAA-H-8083-25C (2023)
  3. AFH ch. 16 (p. 16-17) — FAA-H-8083-3C
  4. AIM 10-1-2 (Helicopter Instrument Approaches) — AIM Basic 2/20/25 w/ Change 1 (8/7/25) & Change 2 (1/22/26)
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