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Add to CartSeaStar H-20 Series Heavy Duty Hynautic Helms are for use with SeaStar's rugged 3-line Hynautic steering systems. These 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:
Max steering wheel diameter: 36"
Specifications:
| Part Number | Displacement | Shaft Style Diameter & Type | Keyway | Integral Valving |
| H-21 | 2.75 cu. in. | 1" Straight | 1/4" Square | Yes |
| H-22 | 2.00 cu. in. | 1" Straight | 1/4" Square | Yes |
| H-25 | 2.75 cu. in. | 3/4" Tapered | #9 Woodruff | Yes |
| H-26 | 2.00 cu. in. | 3/4" Tapered | #9 Woodruff | Yes |
Dimensions:
Note: In the chart below, tubing diameter is based on the distance from cylinder to the farthest helm.
| For Vessel Sizes Up To | Helm Pump Model | Steering Wheel Turns | Requires Cylinder Model | Tubing Diameter - 40 ft. or less | Tubing Diameter 40 ft. or more | Max Suggested HP |
| Planing Hulls | ||||||
| 35' - 50' | H-21 or H-25 | 5.0 | HC5350 or HC5356 | 1/2" | 5/8" | 450 HP |
| 40' - 50' | H-21 or H-25 | 6.8 | HC5351 or HC5357 | 1/2" | 5/8" | 750 HP |
| Displacement Hulls - Tug Boats, Net Haulers | ||||||
| to 30' | H-21 or H-25 | 5.0 | HC5350 or HC5356 | 1/2" | 5/8" | 200 HP |
| 30' - 35' | H-21 or H-25 | 6.8 | HC5351 or HC5357 | 1/2" | 5/8" | 250 HP |
| Displacement Hulls - Work & Pleasure Boats | ||||||
| to 40' | H-21 or H-25 | 5.0 | HC5350 or HC5356 | 1/2" | 5/8" | 300 HP |
| 40' - 45' | H-21 or H-25 | 6.8 | HC5351 or HC5357 | 1/2" | 5/8" | 350 HP |
| Sailboats - Skeg Rudder | ||||||
| to 40' | H-21 or H-25 | 5.0 | HC5350 or HC5356 | 1/2" | 5/8" | - |
| 40' - 45' | H-21 or H-25 | 6.8 | HC5351 or HC5357 | 1/2" | 5/8" | - |
| Sailboats - Spade Rudder | ||||||
| to 40' | H-21 or H-25 | 5.0 | HC5350 or HC5356 | 1/2" | 5/8" | - |
| 40' - 45' | H-21 or H-25 | 6.8 | HC5351 or HC5357 | 1/2" | 5/8" | - |
Click to Download SeaStar H-20 Series Hynautic Helm Application Chart
California Residents: 
WARNING
Cancer and Reproductive Harm -
P65Warnings.ca.gov
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