When a vessel’s propeller sustains sustains deflection damage many operators assume that cropping or replacing the blades is the only solution. However, Subsea Global Solutions’ proprietary propeller straightening technology offers a far more efficient and cost-effective alternative.

Our cold static load straightening method restores the original geometry of the propeller without the need for dry docking. This technique, developed by Kimo Mackie (mentor to our own Mark Morgan) and perfected over 30 years, ensures that your vessel continues to operate as if the damage never occurred.

How Propeller Straightening Works

Instead of cutting away damaged sections, our trained dive teams use a precision propeller press system that incrementally adjusts the blade’s shape back to its factory specifications. This method allows for:

✔ Restoration of the original propeller geometry
✔ Hydrodynamic corrections to maintain balance and efficiency
✔ No need for dry docking, minimizing downtime
✔ A fully restored propeller, preserving thrust and performance

‍

Real-World Success Case Study Highlight: Underwater Propeller Blade Straightening with Cold Static Loading

A bulk carrier suffered propeller blade deformation that was causing vibration issues and reduced efficiency. Instead of resorting to cropping, Subsea Global Solutions deployed its cold static loading technique to restore the blade to its original geometry—all without dry docking.

Using a precision propeller press system, our divers carefully straightened the damaged blade while ensuring hydrodynamic balance was maintained. The vessel’s performance was fully restored, eliminating vibrations and optimizing fuel efficiency. This case highlights how our advanced straightening methods provide a cost-effective alternative to blade cropping or replacement, keeping vessels operational with minimal downtime.

📖 Read the full case study here.

Why Choose Straightening Over Cropping?

Many repair providers immediately resort to cropping when a blade is bent or damaged. While cropping has its place (which we’ll explore in the next blog), it can result in propeller diameter reduction negatively affecting propulsive efficiency. And if the cropping is below the Class rule limit, this makes the propeller ineligible for permanent repair necessitating replacement with a new propeller.

By choosing straightening first, vessel owners and operators can:
🔹 Maintain the original blade size and shape
🔹 Avoid unnecessary modification or replacement
🔹 Prevent cavitation and vibration issues
🔹 Save time and costs by eliminating the need for dry docking

‍

Conclusion

At Subsea Global Solutions, we take a precision-engineered approach to every propeller repair. Before considering cropping or replacement, talk to us about straightening options—it could save you time, money, and unnecessary modifications.

📩 Contact us today to discuss your propeller repair needs.

‍