Underwater ship propeller repair involves fixing damaged propellers without dry-docking, using specialized diving teams and equipment. It includes cleaning, polishing, welding, or replacing propeller blades while the vessel remains afloat. This method saves time and costs compared to traditional dry-dock repairs.

Size: Typically ranges from 0.5 meters to 6 meters in diameter, depending on vessel type.

Grade: Marine-grade materials, often Class 1 or Class 2 for high-performance applications.

Viscosity: Epoxy resins used have viscosities between 500-2000 cP for optimal adhesion.

Buoyancy: Neutral buoyancy materials to minimize additional drag or imbalance.

Material: Bronze, stainless steel, or nickel-aluminum bronze (NAB) for corrosion resistance.

Coating: Anti-fouling coatings may be applied to reduce marine growth.

Operating Depth: Up to 50 meters for underwater repairs, depending on diver and equipment capabilities.

Temperature Range: -10°C to 60°C for repair materials to ensure proper curing.

Hardness: Typically 150-250 HB for propeller materials to balance durability and machinability.

Corrosion Resistance: High resistance to saltwater, achieved through material selection and coatings.