Calculate weight-adjusted aircraft maneuvering speed, reverse current weight, or cross-check Va from stall speed and limit load factor in knots, mph, km/h, lb, or kg.

Use a published Va at the stated maximum/reference weight, with matching configuration and airspeed basis.

Educational estimates. Use the approved aircraft AFM/POH limits. Va does not protect against repeated full inputs or full inputs in multiple axes.

Maneuvering Speed Formula

The following formula gives an aerodynamic cross-check from the 1-g stall speed at the same weight/configuration and the positive limit load factor. It does not replace the aircraft’s approved AFM/POH maneuvering-speed limits.

Vₐ = Vₛ √(n)

Variables:

  • Va is the maneuvering speed
  • Vs is the stall speed
  • n is the positive limit load factor for the same aircraft configuration

For the stall-speed cross-check, multiply the 1-g stall speed by the square root of the positive limit load factor. The separate weight-adjustment mode uses Va₂ ≈ Va₁ × √(W₂/W₁), with matching configuration and speed basis and current weight no greater than the stated reference/maximum.

What is Maneuvering Speed?

Maneuvering speed (Va) is an aircraft-specific operating limitation published in the AFM/POH. Operating at or below Va does not protect against repeated full control inputs in one axis or full inputs in multiple axes. Use the approved limits and procedures for the aircraft and loading; a calculated square-root estimate does not establish a safe speed for every abrupt maneuver or gust.

How to Calculate Maneuvering Speed?

The following steps outline how to calculate the Maneuvering Speed.

  1. For the stall-speed cross-check, determine the 1-g stall speed (Vs) at the same weight and configuration.
  2. Next, determine the approved positive limit load factor (n) for that configuration.
  3. Next, calculate the maneuvering speed using the formula Va = Vs √n.
  4. Finally, calculate the Maneuvering Speed.
  5. After inserting the values and calculating the result, check your answer with the calculator above.

Example Problem : 

Use the following variables as an example problem to test your knowledge.

Stall Speed (Vs) = 60 knots

Positive limit load factor (n) = 3.8