How to anchoring and pick up a mooring - Catamaran sailing techniques | Yachting World
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- เผยแพร่เมื่อ 28 ก.ย. 2024
- Catamarans have many advantages over monohulls when it comes to sitting at anchor or on a mooring. In particular, their shallower draft means that you can get closer to shore and often in less crowded areas. But there are also tips and tricks to carrying out the exercise aboard a boat that has more windage than a monohull and and rides to the anchor in a different way. Nigel Irens explains and demonstrates the techniques.
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This videos are at best, marginally useful - there is no real explanation or context setting. I expect more from Yachting World.
As a life long mariner, I've always been taught to head into the wind and or current when possible, to pick up a mooring line. Never missed one yet.
Not only is this video phenomenally useless, The camera man obviously doesn't sail, He spends more time focusing on the bridge instead the bow where we are could actually potentially learn something.
The video is intended to show experienced monohull sailors the differences with using the differential engine thrust on a catamaran. Everything else about mooring and anchoring is the same as a monohull. That's why it shows using the throttles to turn the boat to the mooring ball, for example.
Thanks for another valuable video for a future catamaran owner (me!).
A couple of questions:
1 What is the purpose of the retrieval line on the bridle - why not just wind in the chain until you can reach the bridle?
2 I presume you attach the bridle to the mooring after you pick it up (this wasn't shown in the video)?
Thanks again.
Attaching the bridle to the mooring line not shown in the video because it's done in the same way as a monohull, and this video is intended to show the differences with a catamaran.
Agree it would be useful to see for folks who haven't done it before.
What model of beautiful power cat are you using in this video ?
Why did you not show the moment of picking up the bouy? In that moment the camera should show this and not the person on the rudder, who does nothing at this moment.
Actually it's exactly the opposite. The video showed the most useful and potentially confusing part correctly.
The video showed the pendant and buoy off to the port side of the boat, then showed the helmsman using the throttles to turn the boat to port so the bowman could pick up the mooring line. He's using a gaff (boat hook) probably because the bridge deck is too high off the water to reach the pendant. (The pendant is the long yellow pole on the small red buoy normally used to pick up the mooring line. On a lower freeboard monohull, it may be reachable by hand without the gaff.)
That's something you can only do if you have two engines.
The video is intended for monohull sailors who already know how to moor and anchor, but to show them how it's done differently in a catamaran using differential thrust from the two engines.
Much easier to come down wind to the mooring. Then you can use astern to hold the bow where you want it.
Once attached the boat will swing to the wind.
This is less safe than an approach into the wind because it assumes the reverse thrust never fails.
If you come up to the mooring from downwind, if the forward thrust fails, you get blown back downwind, which should be a clear direction (since you had a clear path to get to the ball from there).
This is a terrible video. As the other commenters stated below, it leaves more questions and is not particularly informative
There is an easier way especially on a catamaran in strong winds when the mooring is a ball.
Simply attach a single rope at least 2 X longer than the width of your boat to each cleat on the bow of each pontoon, run straight up to the ball in the center. When you're over the ball toss the rope into the water on the upwind side of the ball. Then let the boat drift back, the rope will slider under the ball and hold the boat fast. Then you can take your time, even lowering the dingy to use to attach your bridle lines to the mooring ball tail. Simple!
even easier is to back up to the ball and run a long line through the hole! then bring the ball alongside the boat to the front! easy as hell! ;)
I think for the uninitiated your video leaves more questions than answers. If I may suggest, show the whole video don't be intimidated by showing all the fiddling about, because that really demonstrates in the real word what it takes to anchor and get on and off a mooring ball. Especially in a blow. My 2 cents.:)
Wait a sec. Doesn't the prop, saildrive, whatever thrust onto the rudders even at a dead stop? Doesn't that give us some vectoring?
That's called prop wash, and yes, it does work when the prop is sending waterflow backwards (the usual thrust direction to move the boat forwards), but the effectiveness varies by boat and rudder design.
Prop wash, however, does not work when the waterflow is going forward (the usual thrust direction to move the boat backwards), i.e., the prop is turning in the reverse direction. So prop wash does not work in reverse. That's because the water flow is being sent forward and not backward, over the rudder. (Something else called prop walk can happen in reverse, but this varies with boat and prop design.)
And on a catamaran you may have one prop thrusting forward and another backward in order to turn. In that case, and at low speeds, there is not enough water flow over the keel and rudder to make the rudders turn the boat. We call that losing "steerageway."
Steerageway is the minimum amount of boat speed through the water that enables the rudders to be effective. Below that speed, they are not.
Hard to imagine how commentary could have been less useful. Could not learn anything from this. Obviously just a jolly with no thought being given as to how to provide anything useful.
Cant you at least add some subtitles, to provide some idea as to what is going on?
anchoring in the national park where anchoring is not allowed! wow
learning how NOT to make proper video
Do you think this video actually explains anything to anyone who is trying to learn?
First part - you somehow attach a bridle to the anchor chain with a special hook that you don't show with a retrival line that you don't explain what to do with. Nor do you explain what to do with the bridle.
Second part, you pick up a mooring bouy using the engines and rudder to steer - who would have guessed that?
Does this supposed to reflect the quality of the magazine?
I didn't get anything out of it
No you do not use the rudder to steer. You use differential thrust to steer.
As the boat designer correctly noted, the rudder doesn't steer when speeds are below steerageway. That's true on a monohull too. It's because there's not enough water flow for the rudders to be effective at low speeds.
The video explained why a cat needs a bridle.
The video is intended for folks who have done anchoring and mooring in a monohull, but not a catamaran.
With a catamaran you can approach the mooring slowly from downwind and hopefully downcurrent, and use differential thrust from the two engines to steer the boat to the mooring ball or anchor location.
This can be done at speeds below "steerageway" because you have two engines that are far apart. To turn to port, you give more forward thrust to the starboard engine, as done at the end of the video. And you can put one engine in reverse to turn faster to that engine's side.
For really small adjustments towards one side you can put that engine in neutral. With the engine on the other side still in forward, it will push the bow toward the side that's in neutral. That's also done in the video.
(Steerageway is the minimum speed through the water for the rudders to be effective. Below that speed, the rudders don't do much. That's true on both monohulls and multihulls, but it's why we use propwalk and propwash to turn the boat at low speeds (below steerageway) on a monohull.)
The video was correct in showing the helmsman doing this with the throttles, because picking up the mooring pendant is the same as a monohull, with the exception that the bowman is using a gaff (boat hook) presumably because the bridgedeck is too high above the water to reach the pendant by hand.
The pendant is attached to the long yellow pole on the small red buoy used to pick up the mooring line. It's attached to the mooring lines and thus mooring ball. Normally the pick up pole is supposed to be sticking up a couple meters straight out of the water.
All of this is a bit subtle to folks who haven't done it before, so some of the confusion in the comments is understandable.
The video is intended to transition experienced monohull crew to catamarans.
I would not let this bloke moor my cat .... After years on living aboard a cat we did learn well how to pick up a mooring and to anchor .... With a cat in gusty 15 kt winds it is difficult to pick up a mooring. You need to come up to the mooring at a speed where you have control and hit astern with good revs to stop you. Then your not fighting with the mooring line against the wind..
You're talking about keeping enough speed to maintain steerageway, but that's a bit risky coming into a mooring field.
With a cat in less gusty conditions, you can use differential thrust to steer the boat at below steerageway speeds. That's safer than coming into the mooring too fast and hoping your reverse works to slow you down. What do you do if reverse fails and there are other boats nearby or close upwind?
Also, if you're in a monohull with propwalk, the propwalk from going hard in reverse can turn the boat in an unwanted direction. Cats are less affected by propwalk.
Whoops wrong video!