1. Aircraft Preset

Presets are quick templates for common models. Always confirm exact values with your aircraft's POH.

No Preset

C152 USAA

1976 C172M

PA-34 USAA

3. Limits

Auto-computed for this preset. If no preset is selected these must be determined manually.

4. Current Conditions

Enter an airport identifier. Weather information will be automatically acquired from the FAA.

Airport		Best Runway
Observation		Xwind
Surface Wind		Hwind
Vis / Weather		Field Elevation
Temp / Dew Pt.		Pressure Alt.
Altimeter		Density Alt.

Data sources: faa.gov, aviationweather.gov, airnav.com, how are these values computed?

Latest Surface Analysis & Forecast:

(Click to enlarge)

Click to view weather radar on aviationweather.gov

5. Performance Profile

Auto-computed for this preset & weather data. If no preset is selected these must be determined manually.

6. Aircraft Reference Speeds SE/ME

Autofilled by your preset. Irrelevant fields are left empty. All speeds represented as KIAS.

V-Speed definitions:

In aviation, V-speeds refer to a set of defined airspeeds that are used to ensure safe operation of an aircraft. These speeds are critical for both normal and emergency flight conditions and are unique to each aircraft as defined by the manufacturer.

• Vr (Rotation Speed)
  • The speed at which the pilot begins to pull back on the control column to rotate the aircraft during takeoff.
  • This lifts the aircraft’s nose off the runway to start climbing.
• 50' Obst. Clearance
  • The speed needed to clear a 50ft obstacle at the end of the runway, which would be whatever speed provides the best angle of climb, Vx.
• Vx (Best Angle of Climb Speed)
  • The speed that provides the greatest altitude gain over the shortest horizontal distance.
  • Used when obstacles near the runway must be cleared.
• Vy (Best Rate of Climb Speed)
  • The speed at which the aircraft gains the most altitude in the shortest time.
• Vcc (Cruise Climb Speed)
  • The climb speed designed for prolonged climbs to balance cooling airflow through the engine, fuel efficiency, and performance. It is higher than Vy and is selected to avoid overheating the engine while maintaining a gradual climb.
• Vs0 (Stall Speed in Landing Configuration)
  • The minimum speed for level flight with flaps extended and landing gear down.
  • This is the stall speed in the landing configuration.
• Vs1 (Stall Speed in a specific configuration (typically Clean Configuration)):
  • The minimum speed at which the aircraft can maintain controlled flight in a specific configuration (typically Clean Configuration) (flaps up and landing gear retracted).
  • Flying below this speed with insufficient lift will cause the aircraft to stall.
• Vfe (Maximum Flap Extended Speed)
  • The maximum speed for flying with flaps extended.
  • Exceeding this speed can overstress the flaps and airframe.
• Va (Maneuvering Speed)
  • The maximum speed at which full deflection of the flight controls can be made without overstressing the aircraft.
  • Ensures the aircraft stalls before reaching structural limits during abrupt control inputs.
  • This speed changes based on the weight of the aircraft. Youtube explanation
• Vno (Normal Operating Speed)
  • Also known as maximum structural cruising speed.
  • Below this speed the aircraft is certified to withstand substantial wind gusts without experiencing structural damage.
  • Flying above Vno puts the aircraft in the "Limit" speed range, increasing stress on the structure.
  • Do not exceed Vno, except in Smooth Air, and only with caution.
• Vne (Never Exceed Speed)
  • The maximum speed that the aircraft should never exceed.
  • Flying above this speed could cause structural failure.
• Vg (Best Glide Speed)
  • The speed that provides the best glide ratio in the event of engine failure.
  • Allows the aircraft to cover the greatest distance without power.
• Vapp Short (Approach Speed for Short Field Landing)
  • The recommended approach speed for short-field landings.
  • Allows for a steeper descent angle and safe margin above stall speed.
• Vapp Normal (Approach Speed for Normal Landing)
  • The standard approach speed for normal landings.
  • Used on longer runways where a gradual approach is acceptable.
• Vapp Flapless (Approach Speed for Flapless Landing)
  • The recommended approach speed for landings without using flaps.
  • Requires a higher speed to maintain lift and control without the additional lift from flaps.
  • Provides a safe margin above stall speed, ensuring stable handling during the approach.
• Vxse (Single Engine Service Ceiling)
  • The best speed to climb with one engine inoperative in multi-engine aircraft.
  • Ensures maximum altitude gain per horizontal distance.
• Vyse (Best Rate of Climb Speed with One Engine Inoperative)
  • The best rate of climb speed for a multi-engine aircraft with one engine inoperative.
  • Ensures the highest altitude gain with limited power.
• Vle (Landing Gear Extended Speed)
  • The maximum speed at which the aircraft can safely fly with the landing gear extended.
  • Exceeding this speed could damage the landing gear mechanism or airframe.
• Vlo (Landing Gear Operating Speed)
  • The maximum speed at which the landing gear can be extended or retracted safely.
  • Exceeding this speed can damage the gear mechanism.
• Vmc (Minimum Control Speed)
  • The minimum speed at which a multi-engine aircraft can maintain controlled flight with one engine inoperative.
  • Below this speed, even full deflection of the flight controls cannot overcome the yaw caused by asymmetrical thrust from the remaining engine.