sailboat under power

Yachting World

• Digital Edition

How to manoeuvre a yacht under power

• Rachael Sprot
• September 20, 2023

Want to understand better how to manoeuvre a yacht under power? Yachtmaster Instructor, Rachael Sprot walks through her most important rules for handling under power

When handling under power is done well, it’s like a black art. It wasn’t until I became an instructor that I realised it could be broken down into a few key concepts. I called them ‘The 10 Golden Rules of Boat Handling’. However, when I wrote them it was largely from the perspective of a heavy displacement yacht with fine ends, using a shaft drive. Most of the large yachts I’ve sailed in the past 10 years, such as the Clipper and Challenge yachts, matched this profile.

Recently, I’ve realised that the rules need updating. Yacht design has moved on considerably, and sail drives, long waterlines, bow thrusters and high topsides are now the norm, and twin rudders are increasingly commonplace.

Flexisail, which operates a fleet of modern cruisers, kindly lent me the keys to Varvassi , a Hanse 418, for a day last winter to refine these Golden Rules, and in this two-part series I’ll explain how to make manoeuvring under engine so much easier.

There are two elements to good boat handling: understanding the boat’s handling characteristics; and understanding the external factors which impact a manoeuvre. In the first of this series we’re going to look at how a boat behaves, and next month we’ll consider the real-world scenarios we find ourselves in.

Keep it as slow as you can when manoeuvring in tight spaces – things then go wrong more slowly and you have more time to make corrections. Photo: Paul Wyeth

Rule 1: Slow is pro

The number one rule of boat handling, especially on large yachts, is that if it’s all going wrong, go wrong slowly. You’re unlikely to do much damage at 1 knot. At 3 knots things become expensive. There are times when a burst of power is necessary and, carefully applied, this is an important tool. However, panic revs can cause more problems than they solve. If in doubt, step away from the throttle and pick up a fender – just use the throttle to maintain slow control.

Minimum speed is essential on a heavy boat which carries its way. Once moving, many manoeuvres can be done in neutral. However, the Hanse 418 didn’t hold her way as much as I expected so I had to be more assertive on the throttle, both to keep her moving and to stop her.

A burst of prop wash flowing over the rudder while the boat is stationary creates ‘Type 2’ steerage. Photo: Paul Wyeth

Rule 2: Maintain steerage

The counterpoint to Rule 1 is that you always need steerage. Steerage is created when water flows over the rudder. There are two ways of achieving it which I call Type 1 and Type 2 steerage. Type 1 is what you experience when you’re actively propelled through the water, either by the engine or the wind. It’s easy to forget that the wind can still be used for propulsion, even without sails up. If you’re doing a downwind park (perhaps into the tide), or have some way on, you might not even need the engine in gear to achieve Type 1 steerage.

Type 2 steerage is what is generated when a burst of prop wash flows over the rudder while the boat is stationary. This is an effective technique for tight turns when you need to control the direction of the boat without covering any distance.

In a lighter boat like the Hanse, Type 1 steerage is more effective than Type 2. Under way, Varvassi ’s high-aspect spade rudder was extremely efficient. She was responsive in both ahead and astern. However, there was less response from a power burst. This is probably due to the saildrive, which positions the propeller further from the rudder and creates a delay between action and reaction.

I suspect also that the high aspect rudder profile, though powerful when making way, can’t ‘catch’ as much of the jet created by the propeller. I’m no hydrodynamicist, but a big barn door of a rudder seems to make better use of this thrust. It felt like Type 1 steerage was much more effective than Type 2 steerage in this modern design of boat.

Photo: Ludovic Fruchaud/EYOTY

Twin-rudder variation

If the boat has twin rudders, Type 2 steerage is nearly impossible to achieve. The propeller sends water straight between the two, missing the rudders entirely. You’ll need to keep the boat moving faster in order to maintain steerage and predict what the boat will do until the rudders have gained steerage.

Rule 3: Gear then steer

I once overheard a watersports instructor coaching teenagers in a RIB. ‘Steer, then gear, Henry!’ he exclaimed, too late, as they drifted into a raft of dinghies.

Henry looked crestfallen, but he’d demonstrated that RIBs and other outboard-powered vessels work the other way round to most sailing yachts. In displacement boats with rudders, the rule is: gear, then steer.

In a tight spot every centimetre counts and there are gains to be made from following this simple rule of timing. In a heavy displacement yacht change gear from ahead to astern (or vice versa) first but don’t change the way you’re steering until the boat has actually started moving and water is flowing over the rudder in the desired direction.

This is particularly important when switching from ahead to astern since it takes longer for the boat to stop and water flow to reverse over the rudder. From astern to ahead the steerage switch is more immediate because the prop wash hits the rudder before the boat has started moving, negating the reverse flow sooner.

Varvassi was quicker to regain steerage after a gear change than a more traditional, heavy displacement yacht. The power bursts were less effective but, once moving, steerage was quickly established. It gave me more confidence to change gear in a confined space which, in turn, changed the kinds of manoeuvres I might attempt.

Varvassi has negligible prop walk with her saildrive, so on a boat like this make wider turns and keep up momentum. Photo: Paul Wyeth

Rule 4: Use your prop walk

I’ve learned to love prop walk over the years. The sideways push from a burst astern is like having a stern thruster, albeit in one direction. With a propeller shaft, the steeper the angle, the greater the kick will be.

Boats with skeg-hung rudders often have offset prop shafts too, which induces even more kick one way or the other. On a shaft drive boat I tend to think of it as being right- or left-handed. A boat that kicks to port in astern is right-handed and favours a turn to starboard, and vice versa.

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Many shaft-driven boats will turn in a boat length if you utilise a few short bursts of astern propulsion, just enough to boost the stern around but not enough to get going in, and establish, reverse steerage. This shapes your manoeuvres. In confined spaces a right-handed boat is best positioned on the port side and is easiest to park portside-to, since the prop walk draws it in that way, and creates an escape route by making room for a starboard-hand turn. There are times when this is thoroughly inconvenient, but if you plan your manoeuvres with prop walk in mind it’s largely a blessing rather than a curse.

Varvassi had very little prop walk thanks to the saildrive whose propeller sits vertically rather than tilted downwards as on a shaft drive, so the thrust comes off more cleanly. Furthermore, a saildrive is located further forward, so has less leverage around the boat’s pivot point. I found that a traditional tight turn method isn’t effective on a yacht with a saildrive, and would be even more difficult on a twin rudder boat.

In such cases, a bow thruster would be a really useful tool. Without one you’ll need to keep the momentum and stay in forward gear, but the turn will be wider. Or make a three-point turn by turning hard one way, then reversing back into the space you’ve come from, reversing the steerage too and bringing the bow around in reverse.

Consider how the pivot point of the boat moves in ahead and astern, and beware turning too sharply with a boat with wide beam carried right aft. Photo: Paul Wyeth

Rule 5: Use the pivot point

Understanding the location of a boat’s pivot point is important for any close quarters handling. However, the pivot point is hydrodynamic and changes with the direction of travel. Going ahead it’s just behind the mast; going astern it shifts aft to somewhere around the cockpit, and during acceleration it shifts further to each extreme.

In forward gear we need to be aware of how much boat is behind the pivot point. In reverse it’s the bow we need to watch. It’s important to remember this when dodging an obstruction you’re being set onto. Once the pivot point is past the obstruction you need to turn towards, and not away from it, to keep the rest of the boat clear.

Varvassi ’s full-width stern is a bit like manoeuvring with a pantomime bustle: the danger is not just where you’re looking, it can be behind you. The bigger the boat, the bigger the bustle. To exit a berth I sprang the bow out and drove away with a straight rudder. It took much longer to get clear enough to turn the helm away than it would on a fine-ended yacht.

Bringing it all together

In reality, there’s a complex relationship between the boat and its environment. However, when you’re skippering a new boat it can be helpful to isolate handling behaviours by practising in benign conditions. Is that twitch on the bow when you go astern the result of prop walk? Or was it a gust of wind? Understanding steerage, gear changes, prop walk and pivot points allows us to respond with more precision.

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Foreword by the Author, Grant Headifen. Near the beginning of my open water sailing career, I chartered a 46 ft sailboat in St Maarten. In St Maarten, the charter base is located in a protected cove but with a tricky reef entrance. Therefore the charter base requires that a pilot come out to your boat in a speedboat, jump on board, bring the boat through the reef, and park it in the slip at the marina for you. I spent some time observing this very talented Rastafarian expertly maneuver my chartered boat into the slip. It was a maneuvering job with which I was very impressed. Why? Well, just days before I had knocked the BBQ off the back of the 46 ft sailboat because I could not maneuver the boat in a tight marina with 20 knots of side wind just as it was getting dark. I was trying to back up to a concrete wall and simultaneously lasso pilings as they went past to hold the front of the boat in place and not hit the wall. As captain, I was seeing very quickly that my open water experience was not paying off and was about to cost me, the charter company, and the insurance company a lot of money.

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Student Reviews

All the different techniques are explainted with details

Loved the images.

Animated exercises. Very helpful. Understood what I've read.

Great visuals and understanding forces on the rudder to maneuver in tight areas

Taught me in a very detailed way how boats maneuver and what makes them act the ways they do. Feel like I completely understand prop walk and prop wash now!

very comprehensive...learned some great insights

Learned quite a bit of theory about maneuvering under power, particularly prop walk, catamarans, spring lines.

Learning about rudders forward of props on catamarans.

So many varied maneuvering senarios to explore and learn from !

Good insight about how sail cats and monohulls handle in various conditions and circumstances. I wish I would have taken this before our 2022 BVI sail vacation adventure…sideways maneuvering tactics would have been handy.

Great detail about potentially scary maneuvers.

informative and entertaining at the same time Examples are real life and help with better understanding the topic

Excerpt from the course

Reversing a boat has become quite a favorite of mine now and fun to teach. Please don't just give these exercisers lip service. Actually, get out and do the exercises and - who cares if others are watching - you'll be able to out back and outmaneuver them anytime after this. It's a practiced skill that you'll be glad you did next time you're in a tight marina in some exotic place with 20 knots of wind on the side and everyone is watching you. The question is - will they be nervous or impressed - it's up to you.

This exercise should take about 45 minutes and is really fun to do. Please actually do it rather than just read it. You'll learn so much and be incredibly confident afterward. It's more effective to do this on a windy day. Pick a buoy or ideally two that are about 5 boat lengths apart that are out away from the marina and, of course, during the exercises keep a good watch out for traffic.

Even if you try it the other way to counteract the prop walk - in high enough winds your bow will still be blown downwind.

Other Sailing Courses that you might enjoy:

Qualified Crew Member Sailing Course Coastal Navigation Sailing Course

Sea talk testimonials

I just finished the whole NauticEd program. I am very impressed with what you have done: 10 steps higher than anything else I have studied before. Congratulations. Jean-Loup , Sailing Coach - Toronto

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• Maneuver and Dock Your Sailboat Under Power

No Damage Docking Hacks

Excerpted from  Maneuver and Dock Your Sailboat Under Power

RETURNING TO THE DOCK

Time flies when you are sailing, but sadly the moment comes when it is time to return and put your vessel back in its slip. Much of what has to be done to return to the dock is simply the reverse of what was done to get out of the dock and go.

The following are scenarios which will help you in maneuvering a safe and unscratched boat to the dock, or better known as “no damage docking.”

Wind blowing you off the dock

• Plan a fairly steep approach so that you are facing more so into the wind. Ensure your speed is just adequate to overcome effects from the wind. Ensure dock lines have been placed on the front and rear of the boat well before you enter the marina. Appoint crew members for tying off. Ensure you instruct your crew members not to jump to the dock, but step off once the boat is at the dock.
• Aim toward the point on the dock where you want the center of the boat to end up. Usually you can put it out of gear about here.
• Round out just before the dock. Engage reverse.
• Using a combination of reverse and forward, neatly slide the boat to the dock with zero forward speed. You’ll need to have your crew members act smartly to get the boat tied to the dock. In high wind conditions, you should use a spring line from the front of the boat to the center dock cleat. You can then easily turn the wheel away from the dock and engage forward. This will drive the rear of the boat to the dock. Use a fender on the front.

For more lessons, along with web-based videos to assist you, purchase Maneuver and Dock Your Sailboat Under Power from Practical Sailor .

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