Hatches are a common component found on any vessel and are either installed horizontal, vertical overhead or flat. They are not restricted to size, weight or shape therefore making them convenient for accessing an otherwise in accessible space. Often the hatch cover or lid if hinged, can benefit with an addition of one or two gas springs. The gas springs do not only provide hatch support they also provide hatch lift support meaning they make it easier to lift or open a hatch because of the weight. Boat hatch arms were and are still an economical method to keep a hatch from slamming down on one’s fingers whereas gas spring lift support provide that and more with the ease of installation. Gas springs are available in various lengths and strengths making them ideal for heavy engine cover lift supports.

I think that the ones for car boots will be too powerfull unless your hatch is very heavy. May be worth going for stainless ones?? So I found this document which clearly expresses the formulas used to calculate forces required to lift a weight on an arm.Folding type hatch covers are basically used on general cargo ships. However, these may vary depending on the stowage space and the type of cargo that is carried. Folding type Outward opening serving hatches, are the ideal solution for container cafes, serveries and kiosks. Fabricated on a made to measure basis, these serving hatches, with outward opening shutters, allow you to display menus, branding and outward both when closed and open. Secured with a shoot-bolt mechanism, the serving hatch, can be positioned in any required location so that internally you can ensure any work-top is fitted in-line with the hatch or externally, any ledge or shelving is positioned accordingly to ensure a smooth, customer experience, when being served. Cargo is protected from minor leaks by inner drainage channels that direct water away from the holds to drainage points, preventing cargo from becoming wet. It is therefore critical that not only the compression bar on which the hatch rubber rests but also the inner sill of the drainage channel, be in good condition. Side-rolling hatch covers are made up of two panels that roll sideways on a pair of transverse ramps.

Hatch covers are typically made of steel or aluminum, and they are secured in place with large bolts or clamps. In some cases, hatch covers may also be fitted with weather-stripping or gaskets to further seal the opening and prevent water from entering the ship. Securing of containers has become easier in contrast with a conventional container ship where the containers above the hatch covers had to be secured via lashings separately.

Boat Hatches

You need to have a rough idea of how much force is needed to know what diameter to get but the range of adjustment is quite large. I would have thought that two of the smallest diameter ones would be plenty. How to open rear lift gate? http://repairhelpcenter.blogspot.com/2011/12/how-to-open-rear-lift-gate.html

Do you already have a gas strut that needs replacing? You can search by type or article number. If you see a result then there is a gas strut that can act as a replacement for your current one. If you find no results? outside or inside? http://whatisbyme.blogspot.in/2012/05/2000-toyota-corolla-rear-door-wont-open.html Using proven hydraulic technology, Bennett Hatch Lifter Systems raise hatches at the push of a button. The operation is quiet, smooth and responsive with no cylinder drift.electrics can be fitted internally – bespoke retail fit-outs and lighting solutions available – fully customised to spec You mentioned that the arm has some weight so I added that force to your diagram. Also, I labeled the center of the elbow joint as point 'E'.