Uflex USA Catalog

HYDRAULIC STEERING SYSTEMS 42 All the components of Uflex hydraulic steering systems are made specifically for the marine environment, using materials and manufacturing processes which offer long life and safety for the most extreme conditions. HOW THE SYSTEMWORKS A manual hydraulic steering system consists of a helm, which pumps hydraulic fluid through two hoses to a hydraulic cylinder which is mounted to an engine or rudder.  While steering, hydraulic oil is pushed through hoses into two chambers within the hydraulic cylinder.   Depending upon which direction you steer, one of the two chambers is filled or relieved of oil, thereby changing the course of the boat. While not actively steering, the torque (hydraulic pressure in the hoses) is held by a one way valve in the helm, which eliminates the transmission of the torque “feedback” to the steering wheel. The number of turns from full lock-to-lock has a relationship to ease of steering.  Generally speaking, the more number of turns lock-to-lock the easier the boat will be to steer and vice versa. Because of the variety of applications and handling characteristics of boats, the number of turns lock to lock is often a matter of personal preference.  As a general rule, the first priority should be ease of steering, then number of turns lock to lock.  However, it is not recommended to have fewer than 4 turns lock to lock on high performance boats. To calculate number of turns lock to lock simply divide the cubic inch displacement of the cylinder by the cubic inch displacement of the helm. Other factors that can significantly affect the amount of effort to steer the system can be: • Fittings introduced between the helm and cylinder that restrict fluid efficiency • Oil viscosity • Type of hose and inside hose diameter. • Vessel speed • Trim angle • Rudder dimension, or engine power • Propeller selection • Hull type (displacement, planing, etc.) • Sea conditions UFLEX HYDRAULIC STEERING SYSTEMS