Product

H Style

are heavy-duty commercial propellers engineered specifically for maximum bollard pull, heavy towing, and high-thrust workboat applications. Designed as a Kaplan-type / heavy-duty commercial profile, the "H" Style geometry features wide blade tips and optimized pitch distribution, making it the ideal choice for operation inside Kort nozzles (ducted systems) or as heavy open-wheel propellers on tugs and push boats.

Engineered with broad tip contours optimized for Kort nozzle installations and heavy-duty open-wheel propulsion requiring maximum bollard pull.

Maximizes hydrodynamic efficiency at lower boat speeds, providing superior push-and-pull capability for towboats handling heavy barge fleets.

Cast from high-impact CF3 (modified 304L) stainless steel or Nibral bronze to withstand log strikes, cavitation, and severe river silt abrasion.

Precision CNC-machined and dynamically balanced to ISO 484-2 Class 1 tolerances to protect shafting, reduce engine strain, and eliminate underwater vibration.

Propeller Model Code	Blade Configuration	Diameter Range	Propulsion Material	Primary Commercial Application
H-4B-CF3	4-Blade Kaplan / Heavy Duty	30" to 108"+ (Custom Pitch)	CF3 Stainless Steel (Impact Resistant)	Ducted Kort nozzle push boats, river towboats, and dredges operating in heavy debris.
H-4B-NIB	4-Blade Kaplan / Heavy Duty	30" to 108"+ (Custom Pitch)	Nibral Bronze (Ni-Al-Bronze)	Kort nozzle harbor tugs, commercial fishing trawlers, and workboats.
H-5B-CF3	5-Blade Low-Vibration Kaplan	48" to 108"+ (Custom Pitch)	CF3 Stainless Steel (Impact Resistant)	High-horsepower ducted towboats and multi-screw push boats requiring ultra-low vibration.
H-5B-NIB	5-Blade Low-Vibration Kaplan	48" to 108"+ (Custom Pitch)	Nibral Bronze (Ni-Al-Bronze)	Large commercial ducted tugs, ocean-going push craft, and research vessels.

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Design

Custom commercial propulsion propeller featuring Kaplan/H-style blade contours, heavy hub sections, flat or low-rake geometry, and anti-cavitation blade profiles optimized for ducted (Kort nozzle) or open-wheel commercial installations.

Application

Ducted Kort Nozzle Systems: Commercial tugs, push boats, and trawlers equipped with propeller nozzles for maximum thrust.
Inland Towboats & Push Boats: Multi-screw river vessels requiring extreme bollard pull and heavy backing power.
Harbor Tugs & Dredges: Heavy commercial craft operating under high-load, low-speed towing and pushing conditions.

Materials

CF3 Stainless Steel: Proprietary modified 304L stainless steel offering maximum impact toughness, superior weld repairability, and high fatigue resistance.
Nickel Aluminum Bronze (Nibral): High-density, corrosion-resistant alloy providing exceptional resistance to cavitational erosion and smooth hydrodynamic performance.

Construction

Precision Machined Hub & Bore: Custom SAE or Metric taper shaft bores CNC-machined and checked with calibrated plug gauges for precise fitment to the propeller shaft.
Anti-Singing Edge Bevels: Factory-beveled trailing edges engineered into blade tips to eliminate acoustic singing and hull resonance.
Dynamic Balancing: Dynamically balanced to ISO Class 1 specifications to prevent shaft fatigue, cutless bearing wear, and stuffing box leakage.

Scope of delivery

Custom Kahlenberg H-Style Propeller: Machined, polished, and balanced propulsion propeller built to custom vessel dimensions, pitch, and shaft bore specs.
ISO Class 1 Inspection Certificate: Pitch verification, blade thickness report, bore taper check, and dynamic balance certification.
Documentation: Installation instructions, keyway alignment sheet, and Kahlenberg factory warranty paperwork.

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