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Propeller Disk Loading Calculator calculates disk loading, propeller diameter, and thrust using accurate propeller disk area formulas.
| Equation | Purpose | Notes |
|---|---|---|
| A = πD² ÷ 4 | Propeller disk area | D = propeller diameter |
| DL = T ÷ A | Disk loading | T = thrust |
| DL = 4T ÷ (πD²) | Direct combined form | SI: N/m² (Pa); Imperial: lb/ft² |
The Propeller Disk Loading calculator helps you find the thrust load on a propeller’s swept disk area. It uses propeller thrust and propeller diameter to find disk loading.
Disk loading is useful in propeller design and performance checks. It can help when comparing boat propellers, outboard propellers, aircraft propellers, and drone propeller setups, considering factors like Piston Acceleration.
This calculator can also work backward. You can find the required propeller diameter from thrust and target disk loading. Or, you can find thrust from propeller diameter and disk loading.
The main Propeller Disk Loading formula is:
Disk Loading = Thrust ÷ Disk Area
First, calculate the propeller disk area:
Disk Area = π × Diameter² ÷ 4
So, the main formula becomes:
Disk Loading = 4 × Thrust ÷ (π × Diameter²)
Where thrust is T, diameter is D, and disk loading is DL.
To calculate the required propeller diameter:
Diameter = √[4 × Thrust ÷ (π × Disk Loading)]
To calculate thrust:
Thrust = Disk Loading × π × Diameter² ÷ 4
The calculator converts length to meters, force to newtons, and disk loading to pascals before doing the main calculation. It then converts the answer to your selected unit.
Using this propeller loading calculator is simple.
Choose the calculation you need. You can calculate disk loading, required diameter, or thrust.
Enter the propeller thrust and propeller diameter when calculating disk loading.
Select the correct units. The calculator supports m, ft, cm, in, and mm for length. It supports N, kN, lbf, and kgf for force.
Enter the target disk loading when finding propeller diameter, or enter disk loading and diameter when finding thrust.
Click the calculate button. The calculator converts the values, calculates the propeller disk area, and gives the final result in your selected unit.
Suppose a propeller produces 500 N of thrust and has a diameter of 2 m.
First, find the disk area:
Disk Area = π × 2² ÷ 4
Disk Area = 3.1416 m²
Now calculate disk loading:
Disk Loading = 500 ÷ 3.1416
Disk Loading = 159.15 N/m²
So, the Propeller Disk Loading is:
159.15 Pa
This means the propeller produces 159.15 newtons of thrust per square meter of swept disk area.
The Propeller Disk Loading calculator gives a fast way to calculate propeller disk loading from thrust and diameter. It can also find a required propeller size or estimated thrust from known disk loading.
The same core calculation can support propeller design work, including boat propeller selection, outboard propeller sizing, drone propeller sizing, and other propeller performance studies using Electric Motor Sizing. However, disk loading alone does not determine the best propeller. Pitch, RPM, engine power, hull type, airspeed or boat speed, and operating conditions also matter.
For a boat propeller, you may also need a boat propeller speed calculator, propeller pitch speed calculator, or boat propeller calculator and top speed tool. For drones, propeller diameter, pitch, RPM, motor power, and air density are important.
Propeller disk loading is the thrust produced by a propeller divided by its swept disk area.
The main formula is:
Disk Loading = 4 × Thrust ÷ (π × Diameter²)
Use:
Disk Area = π × Diameter² ÷ 4
Yes. Enter thrust and target disk loading. The calculator uses:
Diameter = √[4 × Thrust ÷ (π × Disk Loading)]
Yes. Use:
Thrust = Disk Loading × π × Diameter² ÷ 4
In this calculator, propeller loading refers to disk loading, which is thrust divided by propeller swept area.
Yes. It can be one useful metric when comparing drone propeller setups. Motor power, RPM, pitch, air density, and flight speed must also be considered.
No. Disk loading alone does not calculate boat speed. A boat speed or propeller pitch calculation also needs factors such as RPM, pitch, slip, gear ratio, and hull conditions.