Propellers for powerboats

 Understanding Propellers: Function and Properties

Propellers are essential for powerboats, converting engine power into thrust to move the boat through water. They vary in blade count, size, and shape, each affecting performance, efficiency, and noise levels. Here’s a breakdown of how different types of propellers work and what to consider when choosing the right one.

Basic Structure and Function

Most propellers have between 2 and 6 blades. When viewed in cross-section, the blades are usually long and thin, with an airfoil shape. Because the blades rotate, the tips move faster than the hub (centre), requiring them to be twisted to maintain efficiency across their length.

Types of Propellers and Their Uses

2-Blade Propellers

Best for: Smaller engines

Advantages: It is lightweight and highly efficient, producing minimal drag. A 2-blade folding propeller has the least water resistance, making it an economical choice that keeps fuel consumption low.

Performance: Produces two pressure pulses per rotation, which may cause more noticeable vibration than propellers with more blades.

3-Blade Propellers

Best for: General pleasure boating, including most powerboats

Advantages: A great balance of speed, fuel efficiency, and smooth performance, making it the most popular choice for recreational boats.

Performance: Produces three smaller pulses per rotation, resulting in less vibration and noise than a 2-blade propeller. It also performs well in rough conditions and strong currents, consistently maintaining speed.

4-Blade Propellers

Best for: Large sailing boats with engines over 150 horsepower

Advantages: Provides greater thrust and stability in choppy conditions, making it a good option for larger boats that need more power. However, it has higher drag and is less fuel-efficient than a 3-blade propeller.

Performance: The extra blade helps reduce vibration but increases drag, which can slightly reduce efficiency.

Additional Considerations When Choosing a Propeller

Vibration: More blades reduce vibration, creating a smoother and more comfortable ride, especially useful for larger boats with powerful engines.

Tip Speed: The longer the blade, the faster the tip rotates, which affects noise and vibration. A well-designed propeller balances blade length and pitch for smooth operation.

Noise: Propellers can create cabin noise if the blade wake strikes the hull or windshield. Generally, more blades help distribute the water pulses, resulting in quieter performance.

Choosing the Right Propeller Size

The larger the boat’s engine, the larger the propeller should be, as a bigger blade surface provides more thrust. Boats requiring strong performance, especially in rough waters, benefit from larger propellers, as they push more water and help maintain stability and speed.

Personal Preferences and Conditions

While performance metrics matter, your personal needs and typical boating conditions also influence the best choice:

For minimal drag: Opt for a 2-blade folding propeller. It creates less resistance in the water and is usually a more budget-friendly option.

For optimal performance in rough waters: A 3-blade folding propeller is more reliable, maintaining speed and reducing vibration.

Prize Giving

 

A Day for Giving back the Silver and Collecting New Prizes

The Upper Thames Sailing Club amassed a large collection of Silverware Prizes to give out to the 2024 prize winners. The silverware was returned by the previous year's winners and put on display in the clubhouse for the 2024 ceremony of presenting the prizes, re
ady for the new winners to take them home for another year.

A Long History

With a history going back some 140 years, the club has accumulated a huge number of cups and trophies—and these were only the ones won by the club members. Each year, the club also holds national competitions, and that silverware had already been presented at the events throughout the year. One of the oldest cups is the Queens Cup, awarded to the A-Rater champions at the Bourne End Weekend festival. For nearly an hour, member after member went up to the front to collect their first, second, and third prizes—some of them walking away with quite a haul of trophies for all their different races.

As for Paul and me? Well, we didn't win any prizes this time, as we came in last in every race we entered. But as newcomers to sailing and still learning, this was to be expected. Besides, there’s always next year, and in the meantime, we’ve got plenty of experience points (and a few good stories) to show for our efforts!

The 2024 AGM
New Roles and responsibilities.  My wife and I volunteered, so my wife joined the house committee to help organise the events and the food to help all the sailors. Her first event is to help organise the Christmas Entertainment. I took on the role as sailing secretary - quite a big role keeping track of all the races and to start soon with helping to organise the Bourne End  weekend. Paul carries on his post as the IT Manager, so all in alll we are now quite heavily involved in the club.

Wrapping the boats up
Nearly a couple of months ago we put the boats out of the rising floods. I thought that we had secured them well for the rains, but the Whaly was a little flooded so we had to rethink how to cover up the boat with what we had available and also to remove the leaves from the Toura​.

Episode 5: Mastering Basic Boat Handling

 

Episode 5: Mastering Basic Boat Handling

In Episode 5, we move into the practical side of powerboat handling, starting with the foundational technique of "steer, then gear." We’ll also explore the impact of wind and stream on your boat’s movement and the concept of pivot points when moving forward and astern. Let’s dive in!

"Steer, Then Gear": Setting the Rudder First

The phrase "steer, then gear" is a reminder to set the rudder direction before applying power. Unlike a car, where you steer while moving, a powerboat benefits from pre-setting the steering before putting the boat into gear. This technique gives you greater precision, especially when manoeuvring at slower speeds or in tight spaces.

1. Set the Rudder: Turn the rudder to your desired direction.
2. Apply Power: Once your rudder is set, apply gentle power. This will cause the boat to respond immediately to the pre-set direction, preventing the delays and drifts that can occur when steering while moving.

Understanding Wind and Stream Effects

One of the unique aspects of boat handling is learning how external forces like wind and water current (stream) impact your movement. These forces are especially noticeable at slow speeds:

• Wind: Wind can push your boat sideways or make it challenging to maintain a steady course. Be aware of the wind’s direction and strength before you set off, and compensate as needed.
• Stream (Current): On rivers, the stream can carry the boat downstream, so you’ll often need to apply more power when moving against it. When moving with the stream, be cautious, as even small adjustments can lead to greater shifts in direction or speed.

Pivot Points: Forward and Astern Movement

Every boat has a pivot point—the spot around which it effectively “pivots” while moving. Understanding this is crucial for making precise turns and manoeuvres:

1. Forward Movement: When going forward, most boats have a pivot point roughly one-third of the way back from the bow. This means that, in forward motion, the bow will swing out wider during turns while the stern remains relatively stable.
2. Astern (Reverse) Movement: When reversing, the pivot point moves to about one-third from the stern. This switch in pivot points can take some getting used to, as the boat behaves quite differently in reverse, with the stern swinging out more during turns.

The Art of Slow-Speed Control

When moving at slow speeds, keep the power in neutral most of the time, engaging the throttle only when you need a burst of control. At low speed:

• Short Power Bursts: Apply short bursts of power to guide the boat while keeping it mostly in neutral. This prevents the boat from building up unwanted speed and gives you time to react.
• Using Momentum: Let the boat’s natural momentum work for you. You'll achieve smoother, more controlled movements by using small power inputs and letting the boat coast.

Conclusion

In this episode, we’ve taken the first steps into boat handling, focusing on some of the fundamentals that make all the difference in tight quarters and tricky conditions. By mastering "steer, then gear," learning to compensate for wind and stream, and understanding your boat’s pivot points, you’ll be well on your way to smooth and confident boat control. Next time, we’ll explore handling techniques for docking and undocking—skills that put all these basics to the test!

Episode 4: Launching and Recovering a Powerboat Safely

 

Episode 4: Launching and Recovering a Powerboat Safely

Launching and recovering a powerboat might seem like a simple enough task, but as anyone who has experienced the joys (and occasional mishaps) of boating will tell you, it requires proper planning and a healthy respect for the elements—especially when the slipway is as slippery as a bar of soap!

In this episode, we’ll dive into the steps and precautions necessary to launch and recover a powerboat, ensuring both your boat and your dignity stay intact.

Planning and Preparation: The Secret to Success

Before you even think about driving down to the slipway, a little preparation goes a long way. Here’s what you need to do:

1. Inspect your equipment: Check your trailer hitch and safety chains to ensure they’re secure. Look over your winch, straps, and ropes for signs of wear.
2. Perform a pre-launch boat check: This includes verifying that the drain plugs are securely in place and any essential equipment, like life jackets and emergency gear, is onboard.
3. Assess the slipway: The most critical step in preparation is to inspect the slipway itself. At the Upper Thames Sailing Club, we’re fortunate to have an electric winch. However, other locations may require you to drive your towing vehicle down to the water’s edge. Look for algae, mud, or wet spots that could be especially slippery.

The Launching Procedure: Smoothly Does It

Launching a powerboat from a trailer isn’t just about brute force—technique and patience are key. Here’s the step-by-step process:

1. Position the Trailer: Back your trailer down the slipway, keeping the wheels straight. If you’re using a vehicle, go slowly and don’t let the trailer wheels go too far into the water. If your location has an electric lift like ours, position the trailer onto the lift platform and secure it.
2. Engage the Electric Lift (if available): Gently lower the boat into the water using the electric lift controls. It’s a smooth and controlled way to manage heavier boats, allowing them to enter the water without the dramatic splash of other methods.
3. Prepare for Launch: If using a manual method, engage the trailer’s winch and slowly lower the boat into the water. If your slipway is especially slippery, having a second person nearby to provide guidance or assistance is a good idea.
4. Start the Engine (in the water!): Once the boat is floating but still tethered to the trailer, start the engine while it’s in neutral. Confirm that water is being properly expelled from the outboard engine’s cooling system.

Recovery: Getting Back to Dry Land

Just when you think it’s all over, you’ve got to get the boat back out of the water and onto dry land. Here’s the process for safe and smooth recovery:

1. Reposition the Trailer: Gently back the trailer into the water until the winch is accessible. If using an electric lift, align the trailer with the lift platform.
2. Attach the Boat to the Winch: Use the winch rope or cable to attach the boat securely to the trailer. Engage the winch to start pulling the boat onto the trailer, ensuring it remains aligned with the trailer guides. In places where an electric lift is available, raise the platform until the boat is settled onto the trailer.
3. Secure the Boat: Once the boat is fully on the trailer, fasten it with safety straps. Ensure that no movement is possible before driving away. Slipping here can cause damage or, worse, launch an impromptu comedy show for everyone onshore.

Final Checks and Safety Considerations

With the boat back on the trailer, you’re almost ready to pack up and leave, but a few final checks are essential:

1. Drain and Clean: Open any drain plugs and allow water to escape. Wipe down the boat to remove any dirt or mud collected during the launch.
2. Re-secure Equipment: Ensure all safety gear, ropes, and loose items are stowed securely for transport.
3. Safety First: Check the trailer connections and lights one last time. Slippery slipways are notorious for surprising even experienced boaters, so if you’re heading out from a particularly greasy one, take it slow and be prepared to lend a hand to fellow boaters.

Lessons Learned on a Slippery Slope

Slipways can be the Achilles’ heel of an otherwise smooth operation. During one memorable launch, even the instructor, who had done this hundreds of times, took a graceful tumble. Fortunately, he popped back up as if nothing happened—after all, nothing bruises a sailor’s pride quite like an audience.

Conclusion

Launching and recovering a powerboat is all about being prepared, staying cautious, and paying attention to the details. By planning ahead, inspecting your equipment, and keeping an eye on the conditions, you’ll be well on your way to mastering this crucial skill. And remember, the electric lift is your friend, especially if you’re not keen on re-enacting a Bambi-on-ice routine at the slipway!

The Importance of a Float Plan

 

The Importance of a Float Plan: What It Is and How to Create One

Whether you’re sailing a dinghy on the Thames or heading out for a day on your powerboat, safety on the water begins long before you leave the dock. Filing a float plan is one of the most overlooked but critical safety measures. This simple document provides vital information about your trip, helping others know where you are and when you should return in case of an emergency.

What is a Float Plan?

A float plan is a roadmap for your boating trip. It’s a detailed description of your voyage, including where you plan to go, who is with you, your vessel information, and when you expect to return. In the event of an emergency, this information can be crucial in directing search-and-rescue efforts to your location.

Even if you’re only going out for a short trip, a float plan adds an extra layer of security by ensuring someone onshore knows your intentions.

Why is a Float Plan Important?

• Increases safety: Authorities will know where to begin searching if you’re delayed or run into trouble.
• Quick response: It helps rescue teams locate you faster if something goes wrong.
• Prepares for emergencies: If you become incapacitated or lose communication, your float plan guides those trying to find you.

A float plan isn’t just for sailors embarking on long voyages—it’s also useful for shorter trips in rivers, lakes, and coastal waters. Filing a float plan is a smart habit, whether you’re a dinghy sailor, kayaker, or powerboater.

What Should Be Included in a Float Plan?

Here’s a checklist of the essential information your float plan should include:

1. Your Vessel Information:

   • Boat name and registration number.
   • Boat type (e.g., dinghy, powerboat, yacht).
   • Boat length, make, and colour.
   • Any identifying features of the vessel (flags, decals, etc.).

2. Trip Details:

   • Departure point and time.
   • Planned route, including waypoints and destinations.
   • Expected return time and final destination.
   • Stops or anchorages along the way (if any).

3. Crew Information:

   • Names and contact information of everyone aboard.
   • Emergency contact numbers for each person.

4. Communication Equipment:

   • List of all communication devices (e.g., VHF radio, mobile phone).
   • Radio frequencies you’ll be monitoring.

5. Safety Equipment:

   • Life jackets or buoyancy aids onboard.
   • Flares, EPIRBs (Emergency Position Indicating Radio Beacons), fire extinguishers, etc.

6. Contact Information:

   • Your name, phone number, and emergency contact on land.
   • The local Coast Guard or maritime authority contact.

7. Contingency Plan:

   • What should be done if you fail to return on time (e.g., contact the Coast Guard).

Example of a Float Plan:

Imagine you’re taking your new Whaly 455R powerboat on the Thames for a day trip from Bourne End to Marlow and back. Here’s what your float plan might look like:

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Float Plan: Bourne End to Marlow Day Trip

• Vessel Information:

  • Boat Name: Whaly Coyote
  • Registration Number: UK-TH455R
  • Type: Whaly 455R Powerboat
  • Length: 4.55 metres
  • Colour: Ocen Green hull, black cover
  • Identifying features: Electric outboard motor
  • Boat Capacity 7

• Trip Details:

  • Departure point: Upper Thames Sailing Club, Bourne End River Thames
  • Departure time: 09:00 AM, 23rd October 2024
  • Planned route: Sailing downstream towards Marlow, following main navigation channel
  • Stops: Possible stop at Hurley Lock for lunch
  • Expected return time: 03:00 PM, 23rd October 2024
  • Final destination: Upper Thames Sailing Club, Bourne End

• Crew Information:

  • John Doe (captain) – 07712345678
  • Jane Doe (crew) – 07798765432

• Communication Equipment:

  • Mobile phone (John): 07712345678
    
    


• Safety Equipment:
• Life jackets for all aboard
• First aid kit
• Flares
• Fire extinguisher
• Buoyancy aids (Level 50)

• Onshore Emergency Contact:

  • Sarah Smith – 07512345678

• Local Maritime Authority:

  • Environment Agency Patrol – 0800123456

• Contingency Plan:

  • If we have not returned by 04:00 PM, please contact the Environment Agency and provide them with this float plan.

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This float plan includes all the vital information someone would need if things didn’t go according to plan. You should share it with a trusted friend, family member, or local authority, ensuring they know what to do if you fail to return on time.

The Upper Thames Sailing Club creates a Float plan for the members whenever there is a race or Fun Sailing. The Duty officer creates this as it is especially important if the boats are out of sight. Usually, the club positions safety boats around the course to ensure the safety of its members, but sometimes, the safety boats rescue others on this stretch of water.

Conclusion

A float plan is a simple but essential safety tool for any boating excursion. It’s especially important for those navigating rivers like the Thames, where weather and water conditions can change quickly. With a well-thought-out float plan, you’ll have peace of mind knowing that others know your whereabouts and can assist you in an emergency.

Before your next adventure, take a few minutes to create your float plan—it’s a small effort that could make all the difference. You may only need it once ...

Choosing the Right Life Jacket or Buoyancy Aid:

 

Choosing the Right Life Jacket or Buoyancy Aid: A Guide for Different Boating Conditions

Whether you’re navigating the Thames in a dinghy or cruising along in a powerboat, safety should always come first. One of the most critical pieces of safety equipment is your life jacket or buoyancy aid, but with so many types available, it can be tricky to know which one is right for your activity. Here’s a guide to help you choose the best option based on the type of boating and conditions you'll encounter.

1. Buoyancy Aids (Level 50)

Best for: Experienced sailors in sheltered waters

• Buoyancy: 50 Newtons
• Key Features: These provide some flotation but are not designed to turn an unconscious person face-up. They're ideal for sailors who can swim and are navigating calm, inland waters.
• Recommended Use: Dinghy sailing, kayaking, paddleboarding.
• Pros: Lightweight, comfortable, and offers good mobility.
• Cons: Not suitable for rough waters or for non-swimmers, as they offer limited flotation.

2. Life Jackets (Level 100)

Best for: Inshore cruising or river sailing

• Buoyancy: 100 Newtons
• Key Features: Designed to turn most unconscious wearers face-up, these life jackets are ideal for slightly more challenging conditions, such as inshore sailing or boating on rivers where help is readily available.
• Recommended Use: Inshore powerboating, larger dinghies, fishing on rivers or lakes.
• Pros: Provides greater safety than buoyancy aids, with some models available in foam or inflatable designs.
• Cons: Bulkier than buoyancy aids and can restrict movement slightly.
  

  

3. Inflatable Life Jackets (Level 150)

Best for: Offshore sailing and boating in rough conditions

• Buoyancy: 150 Newtons
• Key Features: These jackets are equipped to provide enough buoyancy in offshore conditions and will turn an unconscious wearer face-up. Many models come with automatic inflation upon immersion, which is particularly useful if the wearer is incapacitated.
• Recommended Use: Offshore cruising, open water powerboating, long-distance sailing.
• Pros: Provides high buoyancy without compromising comfort, as it only inflates when needed.
• Cons: Requires regular maintenance and checks to ensure the gas canister is functional.
  

4. Life Jackets (Level 275)

Best for: Commercial and heavy-duty offshore use

• Buoyancy: 275 Newtons
• Key Features: Offering maximum buoyancy, these jackets are typically used by those in more extreme maritime environments, such as commercial sailors or those navigating rough seas far from shore. They are designed to turn an unconscious person face-up and provide extra flotation, even if the wearer is weighed down by clothing or gear.
• Recommended Use: Commercial vessels, heavy offshore sailing, or powerboating.
• Pros: Excellent buoyancy, making them the safest option in extreme conditions.
• Cons: Heavier and bulkier, and like the 150 Newton models, they require proper maintenance.
  

Factors to Consider When Choosing a Life Jacket or Buoyancy Aid

• Water conditions: Sheltered inland waters, such as rivers and lakes, are much calmer than open seas. Buoyancy aids are usually fine for calm conditions, while life jackets with more buoyancy are essential for rougher waters.
• Boating activity: Sailing dinghies or kayaking require more mobility, so a lightweight buoyancy aid or a slim life jacket is ideal. For powerboating or offshore sailing, a higher buoyancy life jacket, especially an inflatable one, is recommended.
• Swim ability: Buoyancy aids are only suitable for strong swimmers in calm waters, whereas life jackets provide better protection for non-swimmers or anyone who may become unconscious.
• Fit and comfort: Ensure the life jacket fits snugly but allows for movement. You should always test how comfortable the device is before taking it on a trip.

Conclusion

Selecting the right life jacket or buoyancy aid can make all the difference in an emergency. The key is to match the level of buoyancy to the water conditions and the type of boating you’ll be doing. For dinghy sailing on the Thames, a 50 Newton buoyancy aid may suffice, but if you’re heading out to sea in a powerboat, you’ll want the extra protection of a 150 or 275 Newton life jacket. And don’t forget, no matter how calm the water looks, always wear your life jacket or buoyancy aid—it could save your life!

Learning to Powerboat: Episode 3 - Planning Your Day on the River

 

Learning to Powerboat: Episode 3 - Planning Your Day on the River

Welcome back to the third instalment in my series on learning how to safely head out in a powerboat. So far, we've talked about getting to know your boat and understanding propellers and speed. Now it's time to dive into something equally important, if not a little less glamorous: planning.

Good planning can make the difference between a fantastic day on the river and an unexpected adventure involving rescue boats and soggy sandwiches. As skipper, you are responsible for not just yourself, but your crew, your boat, and even other water users. So, let's look at how to properly plan your day on the water, taking into account weather, tides, river conditions, and the equipment you'll need to ensure everything goes smoothly.

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The Skipper's Responsibilities

First and foremost, the skipper is the one ultimately responsible for the safety of the boat and everyone on it. It sounds a bit serious—and it is—but with proper planning, it doesn't need to be daunting. Here are some key responsibilities of a powerboat skipper:

1. Check the Weather: Before you even think about launching the boat, check the weather forecast. Wind speed, direction, and any potential changes are important to know. You want to avoid unexpected gusts or find yourself out in conditions that are more challenging than you're comfortable with. Since I'm using an electric outboard, the wind has a big impact on battery life, so calm weather is often a plus.

2. Understand the River Conditions: On the Thames, conditions can vary depending on rainfall, currents, and river flow. Make sure you check for any alerts or warnings—for example, red boards indicating strong currents. If the river is running fast, it might be best to stay ashore and have a cup of tea instead.

3. Tides and Water Levels: Depending on your location on the Thames, tides can play a big part in your day. Knowing when the tide will be high or low will help you plan your journey and make sure you avoid any shallow spots or tricky currents.

4. Create a Float Plan: Always let someone onshore know your planned route and expected return time. This way, if something does go wrong, someone will know when and where to start looking for you. It might seem like overkill, but you’d be glad of it if you ran into any problems.

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Planning Your Equipment: Personal and Boat Essentials

Having the right equipment on board can be the difference between a minor hiccup and a major inconvenience. Before setting out, make sure you've got everything you need—both for yourself and for the boat.

1. Personal Equipment

• Buoyancy Aids: Everyone on board should have a well-fitted buoyancy aid or life jacket. There’s no point in stowing them under a seat where they’re inaccessible in an emergency—keep them on at all times.

• Weather-Appropriate Clothing: The Thames can be unpredictable, so dress in layers and make sure you have a waterproof jacket to keep you dry. Remember, wet and cold crew members are not happy crew members.

• Footwear: Non-slip, waterproof shoes are essential. There's nothing quite like trying to navigate a slippery deck in unsuitable footwear—trust me, I've seen enough wobbly moments to know!

• Personal Items: Sunscreen, a hat, sunglasses, and a bottle of water are always a good idea. Even if it doesn't look sunny, reflections off the water can lead to sunburn.

2. Boat Equipment

• Safety Kit: A good safety kit should include a first aid kit, a whistle, flares (if needed), a throw line, and a fire extinguisher. You don't want to need these things, but you’ll be glad you have them if you do.

• Anchor and Line: Make sure you have an anchor and enough line to secure your boat if needed. This is especially important if you’re navigating areas with tricky currents or want to moor up for a picnic.

• Paddle or Boat Hook: Even with an engine, having a paddle or boat hook is useful in case you need to manoeuvre in tight spots or retrieve something from the water.

• Charged Battery: Since I use an electric outboard, my routine before heading out is a bit different. I always check that my battery is fully charged, and since it's a hefty 30kg, I usually charge it at home from our solar batteries. Make sure any charging cables or backup batteries are securely stowed on board—the last thing you want is to run out of power halfway through your trip!

• Navigation Lights: If there’s any chance you’ll be out after dark, ensure your navigation lights are functioning. Even if you’re planning a daytime jaunt, unexpected delays can happen.

A Typical Planning Routine for a Day Out

To give you an idea of what planning looks like in action, here’s a typical checklist I go through before setting out on the Thames:

1. Check the Weather and River Conditions: Look at the forecast and river boards for any warnings.

2. Charge the Battery: Make sure the electric outboard is fully charged and ready to go.

3. Inspect the Boat: Give the boat a once-over. Is the safety equipment all present? Are the lines in good condition?

4. Load Personal Gear: Make sure you have buoyancy aids for everyone, appropriate clothing, and other personal essentials.

5. Float Plan: Let someone know when you’re planning to leave, where you’re headed, and when you expect to be back.

6. Launch with Care: Once everything is ready, launch the boat calmly and confidently—and off you go!

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Final Thoughts: Safety Starts Before You Launch

Planning may not be the most exciting part of powerboating, but it’s certainly one of the most important. Proper planning ensures that when you’re out on the river, you’re free to enjoy the ride without worrying about what might go wrong. It’s all about making sure your boat, your crew, and you are ready for whatever the Thames might throw at you.

In the next episode, we’ll look at the finer points of boat handling, from leaving the dock to coming alongside smoothly—hopefully with a little more grace than my early attempts!

Until then, happy boating, and may all your plans lead to smooth sailing!