MARITIME – ENGINE & MECHANICAL CALCULATOR
Stern Tube Bearing Load
A precise tool.
What is the Stern Tube Bearing Load & How does it work?
The stern tube bearing supports the propeller shaft as it exits the hull, converting rotational motion into thrust while maintaining alignment and sealing against water ingress.
Load on the bearing is influenced by propeller thrust, hydrodynamic pressure, bearing geometry (diameter D and length L), and the number of bearing units sharing the load.
The bearing load per unit can be estimated by adding the thrust component to the pressure‑induced radial force and dividing by the number of bearings.
\frac{T + P \cdot \pi D L}{n}
Q = bearing load per bearing
Parameters
Result
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Frequently Asked Questions
What factors influence the stern tube bearing load?
The stern tube bearing load is influenced by propeller thrust, hydrodynamic pressure, bearing diameter (D), length (L), and the number of bearing units.
How do you calculate the bearing load per unit?
Add the thrust component to the pressure-induced radial force and divide by the number of bearings.
Why is it important to consider hydrodynamic pressure in this calculation?
Hydrodynamic pressure affects the radial force on the bearing, which must be accounted for to ensure proper load distribution.
What does the stern tube bearing do in a ship?
The stern tube bearing supports the propeller shaft as it exits the hull, converting rotational motion into thrust while maintaining alignment and sealing against water ingress.
How many bearing units typically share the load?
The number of bearing units sharing the load can vary depending on the design and specifications of the ship’s stern tube system.
What is the purpose of a stern tube bearing in maritime engineering?
A stern tube bearing ensures the propeller shaft operates smoothly, efficiently, and safely by supporting its weight and maintaining alignment as it exits the hull.
Can you explain the role of thrust in calculating the stern tube bearing load?
Thrust is a critical component of the bearing load calculation as it represents the force generated by the propeller, which must be supported by the bearing.
Results are for informational purposes only and do not constitute professional advice.