Onboard, hatch movement requires precision to avoid accidental impacts or sudden closures while underway. An undersized support or arm will buckle under hatch weight, while an actuator with a miscalculated stroke risks straining the hinges. Choosing the correct component starts with material analysis: AISI 316 is essential in a marine environment to resist oxidation, especially on decks exposed to spray and constant moisture.
When selecting a friction compass, always verify the torque needed to hold the hatch in the desired position. If you are installing electric actuators, account for the rated load in Newtons and the power draw from the onboard electrical system. Keep in mind that the compass pivot point drastically changes the lever applied: incorrect mounting negates the technical specifications of the part, leading to premature failure of the bracket or deformation of the hatch itself.
Our technical advice is exactly for this purpose: matching the specifications of your project with the mechanics of the part you are about to install. We work through any confusion over mounting hole patterns or rod lengths together. Choosing the right part the first time means not having to redo the job mid-season, when time for maintenance is always short.
Criteria for selecting arms and actuators
- Materials: Choose AISI 316 components for exposed areas, or UV-resistant technical plastics for protected interiors.
- Working load: Calculate the hatch weight and add a safety margin, considering that wind can increase pressure when the hatch is open.
- Footprint: Measure the internal space available with the hatch closed, checking that the arm does not interfere with bulkheads or electrical wiring.
- Mounting type: Verify that the mounting bases are compatible with the thickness of the surface you will be fastening the part to.
How do you calculate the correct stroke?
The actuator or compass stroke must allow full hatch opening without the piston reaching end-of-travel under force, a condition that would inevitably damage the mechanism or the mounting point.
Is a mechanical compass or an electric actuator better?
A mechanical compass is suitable for light hatches and frequently used lockers where simplicity is needed. An electric actuator is necessary for lifting heavy hatches, engines, or gangways where manual effort would be excessive or unsafe.
What should I do if the hatch will not stay open?
If the hatch drops, the compass friction is worn or undersized. Before replacing, check whether the tightening adjustment is still effective or whether the hatch load has exceeded the arm's rated capacity.
How do you protect actuators from corrosion?
In addition to choosing resistant materials such as AISI 316, keep the piston rod free of salt deposits that, if allowed to build up, can damage the seals and cause oil leaks or seizure.
What information is needed for a compatibility check?
To help us verify the part, please provide the hatch dimensions, estimated weight, available space, and if possible the type of previous fitting you are replacing.
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