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Trampolines on a Catamaran: Full Explanation
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Just as you probably are right now, I wondered what that weird net in the front of the catamaran is and what it does, it looks fun, but surely that’s not why they put it there? During my research, I have come to discover that trampolines on catamarans are intricate and have a more significant impact on the boat than I first thought.
A trampoline on a catamaran is a squared net at the bow that reduces the risk of capsizing and increases handling and performance. It allows for water to quickly pass through and it reduces the weight forward of the mast. Trampolines can also be used as a place to sit and relax
Continue reading to understand why trampolines on a catamaran are important and how they work.
- Contrary to a solid deck, a trampoline allows water to pass through . This significantly reduces the amount of water that can weigh down on the bows In a situation where the bow gets buried in a wave.
- A trampoline reduces the structural weight forward of the mast , which moves the center of gravity towards the middle of the boat, limiting the pitching effect and reducing the likelihood of burying the bows.
Now that we know what a trampoline does; let’s dig a little deeper and see if we can figure out how it works and why it is important to keep your bows above water level.
Table of Contents
The Benefits of Trampolines Over Solid Decking On a Catamaran
1. Trampolines Reduce The CONSEQUENCES of Burying The Bows
One big benefit of catamarans over monohulls is their speed, but this can also be their downfall if the cat is poorly designed.
When the conditions are right Catamarans are sometimes able to semi-surf down a wave and further increase its speed. When this happens, there is a possibility that the bows will crash into the next wave, and instead of the boat going up and over, it digs its bows straight into the wave. International Journal of Small Craft Technology
If the boat can´t dissipate the water over the bows before the next wave from behind reaches the stern, the cat is at risk of flipping over, also known as capsizing ( Source ).
If the bows get buried, it’s of the highest importance to remove that downward force as soon as possible. With a solid deck, the water needs to pass over and around the boat, this takes time, and time is at a premium in a situation like this.
On the other hand, with a trampoline, the weight of the water has less area to press down on (there are holes in the net), instead, the water flows in between the two hulls, only slightly hindered by the mesh.
This means that the area where water can accumulate is much smaller, and also means that water now has a second route to dissipate, straight down. Thus shortening the time when the bows are under load and in danger of a big wave flipping the cat over.
The same principles apply when running your hand through the water, with your fingers spread out you move more easily in the water, and with the hand flat and fingers together, it’s much harder.
Now that we have understood the risks involved with burying the bows, let’s look at how the trampoline not only reduces the consequences but also reduces the likelihood (consequences * likelihood = risk).
2. Trampolines Reduce The LIKELIHOOD of Burying The Bows
We now know what could happen if we do bury the bows, reducing the likelihood should be one of our highest priorities if we want to have a safe time on the ocean.
The Problem
Personally, I think that Eric Smith of Atlantic-cruising.com does a great job explaining how catamarans are using physics to their advantage. One point he makes is the importance of the center of balance to reduce pitching (the motion of a seesaw).
Just as with a car, there is a need for a low and centered point of balance/gravity to minimize the risk of flipping over (or capsizing if in a boat). When designing a car, attaining a low center of gravity (COG) is fairly easy, on a catamaran, it’s a little bit more intricate.
On the one hand, you want to design a boat where the COG is close to the surface (or even below the surface in a monohull), this will reduce the pitching movement and create a more stable boat.
On the other hand, you want a high enough boat to let waves pass under the deck, this will reduce what is called bridge deck slamming .
Long-term bridge deck slamming will take its toll on both crew and vessel and is, therefore, a safety concern.
The Solution
Knowing all this, it makes sense to replace the hefty glass fiber deck with a lightweight mesh (aka trampolines) , thus reducing the weight of the catamaran (which increases speed) but also moving the center of gravity towards the middle of the boat.
Another benefit of having a vessel that doesn’t pitch as much, is the decrease in seasickness prevalence.
Avoiding seasickness isn’t just nice, seasickness gets you tired, causing you to make bad decisions, and ultimately might be a safety issue.
If removing that water quickly is so important, why is there not just a big hole? Good question, I would argue that there are several reasons; one is that sailing the boat will require you to move all the way to the bow of the boat, and in this case, the trampoline acts as a floor, hindering you from having to balance around and possibly falling into the sea.
It is also worth mentioning that there are different nets to be used, some are more open webbed than others, and the more open the faster the drain of water will be.
C atamaran Trampoline as a Social Area
Technical and safety aspects aside the trampoline are one of the main social areas on a catamaran, it is a beautiful place to enjoy a sunset with some drinks, or do some dolphin watching while underway. This area becomes even more important on smaller boats when outside areas aft of the mast area are limited.
Risks aside, having a solid deck could really be a game-changer when it comes to the social aspects of a sail. If the boat isn’t used for crossing the Atlantic every Thursday, then it is definitely something that brings a lot of value to your trip. Sailing coastal, I would go with a solid deck, and for the great seas, I would choose trampolines.
Why Do New Bali Catamarans Have Solid Foredeck?
With the continuous development in technology, it is now possible to make a foredeck that is quite lightweight but still very strong compared to ten years ago. This has made it possible for manufacturers to bring back the solid foredeck without adding too much weight.
Considering that a solid foredeck adds buoyancy and protects the helm from spray, it can be argued that a lightweight foredeck such as on the Bali 5.4 is just as, or even safer than an older trampoline design.
Especially if the water drainage system is built correctly, which seems to be the case on Bali 5.4 ( Source ).
Trampolines have both a social and a safety function on a catamaran, reduced pitching, less risk of burying the bows, and a perfect place to watch the sunsets.
“ Netting forward rather than solid decking is crucial for an offshore cat‐for comfort and for safety! “ Eric Smith of atlantic-cruising.com
Owner of CatamaranFreedom.com. A minimalist that has lived in a caravan in Sweden, 35ft Monohull in the Bahamas, and right now in his self-built Van. He just started the next adventure, to circumnavigate the world on a Catamaran!
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Why Do Catamarans Have Trampolines?
Last Updated by
Daniel Wade
April 17, 2023
Key Takeaways
- Catamarans have trampolines to help with weight, stability, and extra lounging space
- The trampoline serves as a net located in the middle between the two hull designs
- Whether you choose an open weave or close-mesh you have options to consider
- Properly maintaining a sailing catamarans trampoline can last up to five to seven years
- You can install a trampoline yourself but it is recommended that a professional do it
Catamarans have a unique design with plenty of deck space compared to other sailboats. But why do catamarans have trampolines?
The closed mesh trampoline joint on a catamaran serves various functional and leisurely roles. Catamaran trampolines primarily allow water to quickly pass through the two hulls, preventing capsizing, while also serving as a space for relaxation and weight reduction.
To maintain the safety and functionality of trampolines it is essential to conduct routine inspections and perform appropriate maintenance. You should also take into account their varying materials and designs. A catamaran boat needs to have a trampoline for proper boat functions.
Table of contents
Primary Uses for a Catamaran Trampoline
A catamaran has a trampoline connecting between their two hulls. So why do catamarans have trampolines? These are not your typical trampoline that you jump on but rather a strong net material to lie or walk on as you would normally in the deck area.
Reduce Overall Weight
A catamaran trampoline reduces the vessel's weight by replacing a solid deck or metal deck but also offers accessible deck space to reach different parts of the boat. This way boat owners do not have to worry about giving up valuable space when they shed some pounds off of the boat. This also aids in the boat’s performance and allows it to go faster.
As the void in a trampoline net does not count as a section of the bow then the weight of water it can hold is reduced compared to that of a monohull sailboat. The available area for pressure is decreased by this amount due to that reason.
More Stability
Catamaran trampolines offer a major advantage by ensuring optimal drainage and preventing pitchpoling. This is a hazardous situation in which the catamaran flips due to the bow getting submerged. This particular design allows fast water flow and allows the bow to rise and keep the boat stable.
In order to prevent capsizing the boat needs to disperse water from the front before waves pass and hit the back. When the front gets submerged then prompt removal of the downward force is critical. A trampoline lets water flow between the hulls and dissipate downwards to minimize the water accumulation area and shortening the danger period for the front to flip the catamaran unlike a solid deck.
Lay Around, Watch the Waves, Enjoy the Sun
A catamaran trampoline provides a versatile surface for both walking and lounging under the sun. This allows you to admire the ocean scenery and soak up some rays while you lie on them. Keep an eye on the condition of the trampoline since you do not want to be laying on it and it come loose.
Different Options for a Catamaran Trampoline
Several types of trampolines are ideal based on a variety of factors as each have their own advantages and disadvantages to consider. An open weave or a close-mesh trampoline may be present in a catamaran you are looking to buy or already own. Each might have other materials that you should be aware of to know the quality of your trampoline.
Open Weave vs Close-Mesh
The open weave trampoline is a preferable option for harsh sea conditions due to its efficient drainage while the close-mesh trampoline is more suitable for calm waters. This provides a more comfortable surface to walk or rest on particularly for catamarans.
Mesh Materials
The building materials of a catamaran trampoline may require webbing, mesh fabrics like Dyneema , and different types of netting like polyethylene and polyester. Proper trampoline installations of Dyneema netting is critical due to its lack of elasticity which can cause damage to the catamaran's structure.
Dyneema is great for longevity and against UV rays but it is not suitable for lounging or walking since it is generally used in racing boats or high-performance vessels. You can find less expensive and more comfortable materials as alternatives.
Proper Maintenance for a Trampoline on a Catamaran
A trampoline on a catamaran relies on usage and environmental factors for longevity and can cause differing wear rates. Properly installed and high-quality trampolines last for approximately five to seven years. Regular upkeep is crucial but eventual replacement is inevitable.
Inspect for Damage
Trampolines can sustain damage from different sources such as waves, salt, UV rays, and wear from usage. Horizontal trampolines on catamarans located in southern regions are more prone to deterioration due to intense sun exposure and particularly in tropical areas with high UV radiation.
As trampolines, lashings, and attachment points become older, it is crucial to conduct routine inspections. It is important to examine the threads of sewn-seam webbing in addition to your visual inspections.
Further Steps and Thread Type
For optimal longevity of a trampoline you should utilize high-quality PTFE thread, examine ropes for wear and tear, and ensure proper installation to prevent damage from movement-induced chafing. Thicker ropes and heavier materials can increase resistance to UV rays and chafing and can ultimately extend the trampoline lifespan.
Does a Trampoline on a Catamaran Make it Safer than a Monohull Sailboat?
Catamarans and sailboats have distinct hull designs. Catamarans feature two hulls and a trampoline installation that minimizes overturning force by allowing waves to pass through without much resistance. This solid deck design increases contact area with the ocean and results in a better sailing experience.
When comparing the two you can see why a monohull sailboat is more prone to lean and flipping over due to their instability and inability to handle waves' overturning force. Navigating through rough waters demands a vessel that is not only sturdy but also uniquely stable and efficient.
The catamaran fits the bill perfectly since it offers exceptional stability even in choppy seas. So a catamaran is the better safety choice if you want to prevent flipping and best for wind resistance.
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