Skip to main content
Calcimator

Hydroplaning Speed Calculator

Calculate dynamic, viscous, and reverted rubber hydroplaning speeds from tire pressure. Critical for wet runway operations.

Inputs

PSI

C172: 42 PSI, C182: 55 PSI, B737: 200 PSI, B777: 220 PSI

Results

Dynamic Hydroplaning Speed

66.7 kt

Risk Assessment

Low

Spin-Down Speed46.7 kt
Viscous Hydroplaning Speed57.1 kt
How to Use This Calculator
  1. Enter your main tire pressure from the POH or tire placard.
  2. Optionally enter your expected ground speed for risk assessment.
  3. If your speed exceeds the dynamic threshold on a wet runway, exercise extreme caution.

How the result changes with Main Tire Pressure

Main Tire PressureDynamic Hydroplaning SpeedRisk Assessment
4258.3 ktLow
5566.7 ktLow
200127.3 ktLow

What each input means

Main Tire Pressure
Main gear tire inflation pressure in PSI from the POH or tire placard.
Expected Ground Speed
Optional: enter your landing or takeoff ground speed for risk assessment.

What each result means

Dynamic Hydroplaning Speed
Standing water lifts tire completely. Most common type.
Spin-Down Speed
Once hydroplaning starts, it continues until below this speed.
Viscous Hydroplaning Speed
Thin film on smooth surfaces. Lower threshold.

How this is calculated

Worked example, using the default values

  1. Dynamic Hydroplaning Speed
    V = 9 × √(Tire Pressure in PSI)
    9 × √55 = 66.7 kt
  2. Spin-Down Speed
    ≈ 70% of dynamic hydroplaning speed
    0.7 × 66.7 = 46.7 kt
  3. Viscous Hydroplaning Speed
    V = 7.7 × √(Tire Pressure)
    7.7 × √55 = 57.1 kt

Related Calculators

The questions that sit next to this one — chosen by subject, including calculators filed under a different category.

Aviation & Pilot Tools

Landing Distance Calculator

Corrected landing distance for real-world conditions.

Aviation & Pilot Tools

Crosswind Component Calculator

Break wind into headwind and crosswind for any runway.

Aviation & Pilot Tools

Density Altitude Calculator

Calculate density altitude for flight performance planning.

More in Aviation, Marine & Transport.