Mechanical calculator

Propeller Thrust Calculator

Use an actuator-disk estimate for early propeller checks.

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Calculator

Enter mechanical values

Select units beside each input. Results update automatically.

Mechanical

Shaft power W
Propeller diameter m
Air density kg/m3
Propulsive efficiency %

Result

About this calculator

How it works

This simplified static-thrust estimate uses actuator-disk momentum theory. Real propeller thrust depends on blade geometry, RPM, inflow, and test data.

Formulas

Formulas used

Disk area

A = pi D^2 / 4

Ideal static thrust

T = (2 rho A P^2)^(1/3)

Worked example

Example calculation

Static thrust

500 W, 0.5 m diameter, 70% efficiency gives about 63 N

Guide

How to use this calculator

Enter the known machine, motion, power, or geometry values.
Select units beside inputs where unit menus are shown.
Use the highlighted result first, then review supporting values for design context.

Reference

What the results mean

Thrust

Estimated axial force from the propeller.

Disk loading

Thrust divided by propeller disk area.

Assumptions and limits

Before using the result

Calculations are simplified engineering estimates for idealized geometry and operating conditions.
Real systems may require efficiency, fatigue, slip, vibration, lubrication, thermal, tolerance, and manufacturer data checks.
Use applicable standards, safety factors, test data, and qualified engineering judgement for final machine design.

FAQ

Propeller Thrust Calculator questions

Can I use different units?

Yes. Select the unit beside each input. The calculator converts values internally before solving.

Are these results suitable for final machine design?

Use the results for education, screening, and early design checks. Final designs should include verified data, safety factors, standards, fatigue, tolerances, and manufacturer guidance.

Why can real mechanical systems differ from the result?

Real systems include friction, slip, wear, vibration, misalignment, efficiency losses, and manufacturing variation.