Rolla's New Five-Bladed REXP5 Propeller Represents Breakthrough In Design

Rolla SP Propellers, Novato, Calif., internationally known for designing and producing a wide selection of advanced technology and high-performance wheels, has introduced a fast new 5-bladed geometry stainless steel propeller, the REXP5, intended for transcavitating, supercavitating and surface piercing applications.

The REXP5 propeller represents a revolutionary breakthrough in propeller design, also made possible by the investment casting process.

With inedited cambered sections, extreme radial pitch variance, annexed trailing edge along with 120- degree BAR, the last tests of the REXP5 propellers on a 7-plus deep- V hull with twin 450-hp diesels and propellers in surfacing condition gave a speed of 60+ knots and overall performance as to planing time, cruise condition, reverse and off design conditions that, according to the manufacturer, can be considered remarkable.

Investment cast in 17-4-PH stainless steel or ERO (a new stainless steel developed by Rolla for propellers which are both strong and completely resistant to marine environments) up to 22.6-inch-diameter and 1.36 PD ratio, the REXP5 is the first of a completely new family that will cover the future needs of very fast vessels.

Technical specifications are as follows: propeller, REXP5; type, FL5 RH/LH and OS50/51 RH/LH; construction materials, stainless steel 17-4-PH and ERO; number of blades, 5; description, 15-degree cleaver; diameter, up to 22.6 inches; pitches, 30-31 inches; any bore; splines, Z-25, Z-26, Z-31; applications, transcavitating, supercavitating and surface piercing; design, Rolla SP Propellers; construction, Rolla SP Propellers.

For further information and free literature from Rolla SP Propellers, Circle 119 on Reader Service Card C i r c l e 7 7 o n R e a d e r S e r v i c e C a rd

Maritime Reporter Magazine, page 38,  Mar 1989

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Maritime Reporter

First published in 1881 Maritime Reporter is the world's largest audited circulation publication serving the global maritime industry.