SeaStar Catamaran Hydraulic (Cont.)
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STEERING - CATAMARAN
HOW TO MEASURE HOSES FOR CATAMARANS & PONTOON BOATS:
For a New Installation:
Measure Hose Routing Path in Boat as follows:
A = Center line of wheel to gunwale,
B = Dash to transom,
C = Gunwale to centerline of cylinder connection at centered tiller.
Outboard cylinders move with engine; enough slack must be left in hoses to prevent sharp bends (less than 3”
radius) and/or kinking.
For Tilt Tube Mounting only, add A, B & C + 24”, round up to next even foot. Order that length hose kit.
For “Hydraulic Tie Bar” installations only, note locations of helm, cylinders and alignment valve. (See diagram on
Alignment Valve page for typical hose routing.) Hoses are sold in pairs.
There are three ways to steer dual engine pontoon boats and catamarans with SeaStar, summarized below
in order of preference:
MECHANICAL TIE BAR SYSTEM
(PIVOT MOUNT OR SIDE MOUNT CYLINDERS REQUIRED)
Dual engines should be connected with a mechanical tie bar whenever possible. This is the preferred
method. Single or dual cylinders (pivot or side mount) can be used depending on steering effort and
DRAG LINK SYSTEM
(FIXEDN MOUNT CYLINDERS REQUIRED)
An HC5343/HC5374 cylinder can be used where boat design allows. This requires 2 drag links (not supplied
by SeaStar) to connect the engines to the cylinder.
NOTE: To establish whether or not this type of cyinder is suitable for your application, the following points should be considered:
1.) Fore and aft alignment of cylinder. If not mounted in line, each motor will have a different turning radius. 2.) Distance between motors.
3.) Distance of travel in tilt arc. 4.) Horizontal alignment of cylinder.
HYDRAULIC TIE BAR SYSTEM
(PIVOT MOUNT OR SIDE MOUNT CYLINDERS AND ALIGNMENT VALVE REQUIRED)
“Hydraulic Tie Bar” — SeaStar Alignment Valve may be used in conjunction with a cylinder mounted to
each engine (only if a tie bar or drag links cannot be used).
NOTE: The Cylinder Alignment Valve (part # HA5471-2) will allow for the periodic required realignment of two outboard motors or rudders
that are linked together with a Hydraulic Tie Bar as opposed to a solid link or a Mechanical Tie Bar. Boats exceeding 55 mph must use the
SeaStar Pro Helm Pump (part #HH5770) and SeaStar Pro Kevlar® Hoses.