Nomatra
21.04.2021 23:38:36
The mechanism for keel raising and lowering on the Sun Odyssey 35 is the identical system to the Beneteau 343, as can be seen from this Oceanis 343 drawing and the SO35 pdf download below:
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The mechanism for keel raising and lowering on the Sun Odyssey 35 is the identical system to the Beneteau 343, as can be seen from this Oceanis 343 drawing and the SO35 pdf download below:
Marc Lombard (Designer of the Sun Odyssey 35 Lift Keel) provided the following alignment advice: here
"You must set the rudders parallel, that is the "average best solution" as flow is not always parallel, but it depends upon the heel mainly, so best average result and at least as a basic reference trimming you must set them parallel the flow. To do this, with the boat ashore, you should set the boat first horizontal (the floor boards inside are horizontal, so you can put a level on the floor boards). Check with height of shear at midship with a laser level. Then trace a horizontal line on both rudders (or a mark on trailing edge and a trace on leading edge of both rudders), using a laser level. Then measure the distances between both leading edge, the between both trailing edges, at the level of the horizontal marks, they should be equal. If not proceed to adjustment and check again until the values are equal at less than 3mm differences. The rudders will then be set parallel". here
Failed eye bolts are indeed rare, but they do happen, as shown in the picture below. This eye bolt probably failed due to repeated shock loading by the keel cable. That could have been due to the keel hitting submerged objects and swinging up, which puts slack in the cable that is jerked out when the keel swings back down. A properly tightened keel lock bolt would have prevented the keel from swinging freely and building up damaging force. [links]
Have you ever experienced or prevented a swing keel lifting system failure? If so, leave a short description in the comments for others to learn from.
The more often you inspect the parts in your swing keel lifting system, the more likely you will discover wear patterns and problems early, when they’re simpler and less expensive to fix. A bit of maintenance will go a long way toward making your sailing safer and keeping your sailboat in top shape. Don’t make any of these blunders and become an example of what not to do.
The eye bolt where the winch cable is attached to your keel is the last link in the keel lifting system chain. It’s a simple part that doesn’t need much in the way of maintenance but it’s as critical as the other parts. If it fails, it will fail instantly and probably completely. [links]
Most swing keel lifting systems comprise four critical parts: the winch (1), cable (4), one or more turning blocks or balls (7), and the eye bolt attached to the keel (9). The system is like a chain, only as strong as its weakest link. Consequently, you must keep each part of the system in good working condition and inspect it often to watch for signs of danger or you risk joining the examples above. The parts at the other end of the swing keel system: the pivot pin (14), keel hangers (12), spacing washers (13), centering spacers (not shown), and lock bolt (15) are not discussed in this post. I describe them and refinishing the keel itself (11) in my five-part series that starts with Refinish Your Swing Keel for Best Performance – Part 1: Removing.
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Yes. The boat is safe to sail with the keel in any position including raised all the way up. Naturally the boat makes a lot of leeway when going to windward with the keel completely retracted, but she only heels a few more degrees. To understand this you can look at the image below of the keel for our Southerly 49 before it was installed during the build. The keel assembly consists of the massive grounding plate (weight 3180 kilos) plus the swinging keel at 2050 kilos. When you swing the keel up the centre of gravity does raise but not by enough to effect the safety or heeling by very much since so much of the ballast is in the grounding plate. In the picture above we have the keel of our Southerly 42 almost all the way up sailing the shallows of the Bahamas. We are drawing about 4.5 feet instead of our usual 9 feet (2.72m), the deepest draft of the Southerly 42. We are beating upwind and, despite making more leeway than usual, she still makes progress upwind. here
Lifting the keel can reduce or eliminate the risk of the yacht broaching. According to cruising guru Jimmy Cornell, who owns a Garcia Exploration 45, "continuing to lift (the keel) up to the point where the board is fully retracted, is a great advantage as the risk of broaching is virtually eliminated. The absence of a keel to act as a pivot in a potential broaching situation means that the boat does not tend to round up when, in a similar situation, a keeled boat would do just that. It is a feature that I have blessed on many occasions and that has allowed me to continue keeping the spinnaker up longer than I would have done otherwise." more
Before we sailed a Southerly Yacht across the ocean (we've now done it 5 times), I wondered what it would be like on a boat with a swing keel. Talking with other sailors who owned shallow-draft swing-keel yachts, I realized there were more options for sailing efficiently if you have a lifting keel. Swinging the keel up to raise it means you have actually moved the centre of lateral resistance backwards. It's possible to use this to your advantage when sailing downwind. Normally the yacht designer has carefully calculated the best position to mount a fixed keel. For a yacht with a swing keel, the design is done to optimize performance with the keel all the way down. When we swing the keel partially up, the centre of effort moves aft as you can see in the diagram below. We use this to improve performance when sailing downwind plus it reduces helm effort. It is similar to sailing a dinghy. With the keel most 70 percent raised, we have modified the bottom profile so the boat is more like an arrow. In this position the boat loves to sail downwind! more
We're currently developing a new model of swinging keel shallow draft monohull. Distant Shores III be 48 feet long with a draft around 3' with the keel up. If you are in the market for a similar sailboat and would like more information please email us.
Yes. The keel lifting mechanism is a system and as such has a maintenance schedule. Once a year we check the hydraulic level, and every five years we replace the pennant that lifts the keel.