Specifications

188
Engine & Steering Controls
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HYNAUTIC HYDRAULIC ENGINE
CONTROLS offer the boat owner a very
positive, synchronized method of relaying
multi-station remote commands to the
engine's throttle and transmission linkages.
Engine controls have been packaged into
systems for complete and simple installa-
tion. Systems have been designed for up to
three stations, using either nylon tubing or
copper tubing. A fourth station is possible,
depending upon the length of the tubing run.
Nylon tubing is preferred because of ease of
installation and the material's expansion
characteristics.
The slave unit is designed to deliver up to
120 inch pounds of torque through 80 de-
grees of travel. Therefore, a system will
accommodate marine engines and hydrau-
lic transmissions used on most boats to 100
feet. These systems have also been adapted
for operating bow thrusters and variable
pitch propellers.
How the System Works
Sending Unit
When the control handle of the Sending Unit is
moved, mechanical energy is transformed into
fluid energy by means of a rack and pinion at-
tached to an internal piston. This piston expels
fluid from the sending unit into all other control
heads and the slave unit. The pistons in each of
these units are thus moved an equal distance,
causing a corresponding movement in the lever
arm of each.
To control synchronization, the piston in each
sender and slave contains two small valves. These
are opened when the piston reaches the end of the
stroke, allowing excess fluid to pass through the
piston and into the system. Controls can be syn-
chronized, if necessary, by rotating the lever arm
of any control head from stop-to-stop.
The Reservoir maintains the extra fluid and a constant
pressure head (80 psi) for the system. The flow of fluid
to and from the reservoir is regulated by the Charging
Valve. As fluid expands due to engine temperatures, the
excess liquid is expelled into the reservoir at a con-
trolled rate. Likewise, fluid is returned to the system as
temperatures drop.
Each Throttle Slave Unit contains an over-travel bun-
gee in its linkage to the engine. This device assures that
the slave piston will reach end stroke in each direction.
Otherwise, the balance between senders and slave can-
not be maintained. The transmission slave unit has a
mechanical detent to indicate a neutral position. Each
throttle slave is equipped with an external pilot check
valve which prevents control arms from drifting back to
an idle position.
R-13
Reservoir