Hynautic

INTRODUCTION
SeaStar offers rugged 3-line Hynautic Heavy Duty steering systems for most work and pleasure vessels up to 70 feet.

Heavy Duty helms combine one or two bi-directional axial piston pumps with pilot check and make-up check valving. The result is a unit which prevents rudder feedback, is very efficient (even at low RPM), and is immediately adaptable to multi-station use.

A wide choice of helm displacements and cylinder configurations make it easy to spec a system which can handle a variety of large boat performance requirements and accommodate most user preferences.

Features
• Low friction heavy duty hydraulic steering.
• Helm/cylinder combinations for most inboards. Marine grade materials.
• Heavy duty helms available in three displacements, to accommodate most applications and user preferences.
• Helms available with 1” straight shaft or 3/4” tapered. Mount facing any direction.
• Quick air purge relief valve.
• Fluid fill at remote reservoir.
• Heavy duty brass cylinders. Two-axis articulation. Easy installation for single or dual rudder vessels.
• Meets or exceeds applicable standards.
• Accepts most steering wheels.

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Application Guide
Order Guide
Helm Optins
Tubing Hose Options
Cylinder Options

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APPLICATION GUIDE

FOR VESSEL SIZES UP TO: HELM PUMP MODEL STEERING WHEEL
TURNS
REQUIRES CYLINDER MODEL
(2x = 2 Cylinders)
TUBING DIAMETERS
when distance from Cylinder to farthest Helm is:
MAX. SUGG. H.P. SUGG. AREA FEET
(meters)
40 Feet
or Less
40 Feet
or More
Planing Hulls
35-50′ (11-15m) H-21 or H-25 5.0 HC5350 or HC5356 1/2” 5/8” 450
40-50′ (10-18m) H-21 or H-25 6.8 HC5351 or HC5357 1/2” 5/8” 750
40-50′ (10-18m) H-42 4.7 HC5351 or HC5357 1/2” 5/8” 750
45-60′ (14-18m) H-42 7.4 HC5378 or HC5379 1/2” 5/8” 950
45-60′ (14-18m) H-41 5.4 HC5378 or HC5379 1/2” 5/8” 950
55-65′ (17-20m) H-41 5.4 HC5378 or HC5379 1/2” 5/8” 1200
to 70′ (to 21m) H-41 10.8 2x HC5378 or HC5379 1/2” 5/8” 1500
to 70′ (to 21m) H-41 14.2 2x K-8 1/2” 5/8” 1500
Displacement Hulls – Tug Boats, Net Haulers
to 30′ (6-9m) H-21 or H-25 5.0 HC5350 or HC5356 1/2” 5/8” 200
30-35′ (6-11m) H-21 or H-25 6.8 HC5351 or HC5357 1/2” 5/8” 250
30-35′ (6-11m) H-42 4.7 HC5351 or HC5357 1/2” 5/8” 250
26-40′ (8-12m) H-42 7.4 HC5378 or HC5379 1/2” 5/8” 400
26-40′ (8-12m) H-41 5.4 HC5378 or HC5379 1/2” 5/8” 400
30-45′ (9-14m) H-41 5.4 HC5378 or HC5379 1/2” 5/8” 450
to 50′ (to 15m) H-41 10.8 2x HC5378 or HC5379 1/2” 5/8” 500
to 50′ (to 15m) H-41 14.2 2x K-8 1/2” 5/8” 500
to 50′ (to 15m) H-41 20.0 2x K-9 1/2” 5/8” 500
Displacement Hulls – Work and Pleasure Boats
to 40′ (9-12m) H-21 or H-25 5.0 HC5350 or HC5356 1/2” 5/8” 300
40-45′ (12-14m) H-21 or H-25 6.8 HC5351 or HC5357 1/2” 5/8” 350
40-45′ (12-14m) H-42 4.7 HC5351 or HC5357 1/2” 5/8” 350
40-55′ (12-17m) H-42 7.4 HC5378 or HC5379 1/2” 5/8” 500
40-55′ (12-17m) H-41 5.4 HC5378 or HC5379 1/2” 5/8” 500
45-65′ (14-20m) H-41 5.4 HC5378 or HC5379 1/2” 5/8” 650
to 75′ (to 23m) H-41 10.8 2x HC5378 or HC5379 1/2” 5/8” 750
to 75′ (to 23m) H-41 14.2 2x K-8 1/2” 5/8” 750
Sail Boats – Skeg Rudder
to 40′ (9-12m) H-21 or H-25 5.0 HC5350 or HC5356 1/2” 5/8” 9 (.9)
40-45′ (12-14m) H-21 or H-25 6.8 HC5351 or HC5357 1/2” 5/8” 10 (1)
40-45′ (12-14m) H-42 4.7 HC5351 or HC5357 1/2” 5/8” 10 (1)
40-52′ (12-16m) H-42 7.4 HC5378 or HC5379 1/2” 5/8” 17 (1.6)
40-52′ (12-16m) H-41 5.4 HC5378 or HC5379 1/2” 5/8” 17 (1.6)
50-60′ (15-18m) H-41 5.4 HC5378 or HC5379 1/2” 5/8” 18 (1.7)
to 65′ (to 20m) H-41 10.8 2x HC5378 or HC5379 1/2” 5/8” 20 (1.9)
to 65′ (to 20m) H-41 14.2 2x K-8 1/2” 5/8” 20 (1.9)
Sail Boats – Spade Rudder
to 40′ (9-12m) H-21 or H-25 5.0 HC5350 or HC5356 1/2” 5/8” 7 (.6)
40-45′ (12-14m) H-21 or H-25 6.8 HC5351 or HC5357 1/2” 5/8” 8 (.7)
40-45′ (12-14m) H-42 4.7 HC5351 or HC5357 1/2” 5/8” 8 (.7)
35-46′ (11-16m) H-42 7.4 HC5378 or HC5379 1/2” 5/8” 15 (1.4)
35-46′ (11-16m) H-41 5.4 HC5378 or HC5379 1/2” 5/8” 15 (1.4)
40-50′ (12-15m) H-41 5.4 HC5378 or HC5379 1/2” 5/8” 15.5 (1.4)
to 60′ (to 18m) H-41 10.8 2x HC5378 or HC5379 1/2” 5/8” 16.5 (1.5)
to 60′ (to 18m) H-41 14.2 2x K-8 1/2” 5/8” 16.5 (1.5)

Notice
The application guide should be used with discretion. The chart is only a guide to selecting a steering system. A steering system manufacturer cannot anticipate all the variables in boat-rudder design that affect the steering loads. It is the final responsibility of the boat builder/designer to specify maximum expected steering loads. If the required information is not available, please see the Displacement and Planning Hull data sheets on page 10-21 and page 10-22. These sheets after being completely filled out can be faxed to SeaStar Solutions® Technical Support at 604-279-2202.

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ORDER GUIDE

DESCRIPTION PART NO.
Components
Hynautic H-20 helm (1” straight shaft) H-21 or
Hynautic H-20 helm (3/4” tapered shaft) H-25 or
Hynautic H-40 helm (1” straight shaft) H-42 or
Hynautic H-40 helm (3/4” tapered shaft) H-42-02 or
Hynautic H-40 helm (1” straight shaft) H-41 or
Hynautic H-40 helm (3/4” tapered shaft) H-41-02
H-20 Fittings Kit for Main Station HF-10
H-40 Fittings Kit for Main Station HF-21
Inboard Cylinder HC5350
Reservoir – Standard (2 quart) R-06
Relief Valve (950 PSI) MSV-21
Relief Fittings (1150 & 1175-21-1) MSVF-07
Relief Fittings (1175-42-1 & up) MSVF-13
Copper Tubing 1/2” or 5/8” OD
Fitting Kit (for 1/2” Copper Tubing) HF5590 or
Fitting Kit (for 5/8” Copper Tubing) HF5592
Hose Kit for Copper Tubing (2 hoses) HA5731
SeaStar Oil (1 Gallon) HA5440
Options
Pivot Mount Inboard Cylinder K-31
Dual Cylinder Hose 2’ (.6m) HA5732
Dual Cylinder Hose 3’ (.9m) HA5733
Dual Cylinder Hose 4’ (1.2m) HA5734
Dual Cylinder Hose 5’ (1.5m) HA5735
Dual Cylinder Hose 6’ (1.8m) HA5736
Reservoir (2 quart, with hand pump) R-07
Reservoir (1 quart, with hand pump) R-11
Reservoir (2 quart) R-12
Relief Valve (500 PSI) MSV-19
Reservalve (500 PSI, top read, 3/8) RV-55
Reservalve (500 PSI, top read, 3/8, w/pump) RV-55P
Reservalve (500 PSI, top read, 5/16, w/pump) RV-57
Reservalve (950 PSI, top read, 5/16) RV-60
Reservalve (950 PSI, frt.read, 5/16, w/pump) RV-67
H-20 Fittings Kit for Second Station HF-11
H-40 Fittings Kit for Second Station HF-22
Service Items
Reservoir (2 quart, with hand pump) R-07
Reservoir (1 quart, with hand pump) R-11
Reservoir (2 quart) R-12
Relief Valve (500 PSI) MSV-19
Reservalve (500 PSI, top read, 3/8) RV-55
Reservalve (500 PSI, top read, 3/8, w/pump) RV-55P
Reservalve (500 PSI, top read, 5/16, w/pump) RV-57
SeaStar Oil (1 Gallon) HA5440

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HELM OPTIONS

Four helms are offered in 3 displacements, as noted in the chart at right. The H-21 helm has a 1″ straight wheel shaft; H-25 has a 3/4″ tapered shaft. The H-42 and H-41 helms both have a 1″ straight wheel shaft.

HELM PART NO. DISPLACEMENT RANGE RELIEF VALVE STEERING
H-21 2.75 cu.in. 950 psi (66Bar)
H-25 2.75 cu.in. 950 psi (66Bar)
H-42 4.00 cu.in. 950 psi (66Bar)
H-41 5.50 cu.in. 950 psi (66Bar)

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TUBING / HOSE OPTIONS

Use soft refrigeration type copper tubing for optimum performance. For tube-to-cylinder flex hoses, select a hydraulic hose rated for 1000 PSI (70 bar) working pressure, and with a very low volumetric expansion rating.

HELM TYPE DISTANCE—CYLINDER TO FURTHEST HELM
40 FEET OR LESS MORE THAN 40 FEET
All 1/2″ O.D. Copper Tubing 5/8″ O.D. Copper Tubing

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CYLINDER OPTIONS

Cylinders are made from brass & stainless steel. Available with stainless rod & ball joint (TMB models) or stainless rod & bronze clevis (TMC models.) Cylinders with ball joints have 2-axis articulation.
The K-31 is an optional pivot mount cylinder which can be used in the systems numbered “8a” and “8b” on the opposite page. With this cylinder, the number of wheel turns becomes 6.4 (using the H-42 helm) or 4.6 (H-41 helm).

MODEL PART NO. DESCRIPTION / MODEL / ROD END CONFIG
7″ Stroke: HC5350 Cylinder BA175-7TMB (Rod End Ball Joint)
HC5350 Cylinder BA175-7TMB (Rod End Ball Joint)
HC5350 Cylinder BA175-7TMB (Rod End Ball Joint)
HC5350 Cylinder BA175-7TMB (Rod End Ball Joint)
11″ Stroke: HC5378 Cylinder BA200-11TMB (Rod End Ball Joint)
HC5379 Cylinder BA200-11TMC (Rod End Ball Clevis)

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