Product

Delta style

are heavy-duty fixed and variable pitch propellers engineered specifically for inland river push boats, towboats, tugs, and commercial workboats operating under shallow draft or debris-filled conditions.

Maximizes blade surface near the tips to deliver extreme thrust and efficiency when vessel draft limits the maximum propeller diameter.

Designed with optimal rake and skew profiles (including zero-rake options) to provide maximum bollard pull and strong reverse stopping power for inland river push boats.

Cast from proprietary CF3 (304L modified) stainless steel or Nibral alloy to withstand severe impacts from submerged logs, silt, and river debris.

Machined with 3D-modeled pattern precision and inspected to ISO 484-2 Class 1 tolerances to minimize vibration, reduce shaft wear, and improve fuel efficiency.

Propeller Model Code	Blade Configuration	Diameter Range	Propulsion Material	Primary Commercial Application
DELTA-4B-CF3	4-Blade High DAR (Commercial Pitch)	30" to 108"+ (Custom Pitch)	CF3 Stainless Steel (Impact Resistant)	Inland river push boats, towboats, and dredges operating in debris/silt waters.
DELTA-4B-NIB	4-Blade High DAR (Commercial Pitch)	30" to 108"+ (Custom Pitch)	Nibral Bronze (Ni-Al-Bronze)	Harbor tugboats, coastal workboats, and commercial fishing vessels.
DELTA-5B-CF3	5-Blade Low-Vibration (High DAR)	48" to 108"+ (Custom Pitch)	CF3 Stainless Steel (Impact Resistant)	High-horsepower multi-screw push boats requiring reduced hull vibration.
DELTA-5B-NIB	5-Blade Low-Vibration (High DAR)	48" to 108"+ (Custom Pitch)	Nibral Bronze (Ni-Al-Bronze)	Crew boats, passenger ferries, and commercial craft demanding ultra-smooth thrust.

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Design

Heavy-duty commercial marine propeller featuring custom variable or constant pitch geometry, flat or low-rake blade profiles, and Gawn/B-Series hydrodynamics optimized for open-wheel and push-boat applications.

Application

Inland River Towboats & Push Boats: Multi-screw towboats pushing heavy barge fleets in shallow, restricted river channels.
Commercial Tugs & Dredges: Heavy-tonnage vessels requiring maximum bollard pull under heavy load conditions.
Workboats & Fishing Vessels: Commercial craft operating in debris-heavy or silty coastal and river waters.

Materials

CF3 Stainless Steel: Proprietary modified 304L stainless steel formulation providing superior fatigue strength, ductility, and corrosion resistance.
Nickel Aluminum Bronze (Nibral): High-density marine alloy offering excellent cavitational erosion resistance and smooth surface finish.

Construction

Precision Machined Hub & Bore: Precision SAE taper shaft bores CNC-machined and verified with calibrated plug gauges for perfect shaft seat fit.
Anti-Singing Trailing Edges: Beveled trailing edges engineered into blade tips to prevent underwater harmonic acoustic singing and vibration.
Dynamic Balancing: Dynamically balanced to ISO Class 1 standards to prevent tailshaft stress and bearing wear.

Scope of delivery

Custom Kahlenberg Delta Propeller: Machined, balanced, and finished to custom vessel pitch/bore specs.
Quality Inspection Report: Pitch, bore taper, and balance certification report matching ISO Class 1 requirements.
Documentation: Installation guidelines, keyway verification sheet, and Kahlenberg factory warranty paperwork.

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