Trim tabs are small, adjustable fins attached to the rear of a boat, which help to keep it stable in the water and improve its speed and handling. They are not a legal requirement, but they can be very useful for novice boaters or those who often find themselves in rough water. They are also handy when towing objects or people behind the boat. Trim tabs can be controlled manually or automatically. Automatic trim tabs, also known as 'smart' trim tabs, are controlled by a computer and can adjust themselves to maintain the desired boat attitude and heading, even in rough seas. This helps to keep the boat level and reduces drag on the hull.
What You'll Learn
How automatic tabs can correct listing
Automatic trim tabs can correct listing by adjusting the trim of the boat. Listing, or leaning to one side, can be caused by uneven weight distribution, prop torque, or wind. By using trim tabs, boaters can adjust the trim of their vessel and correct listing. This is done by raising the tab on the side of the list and lowering the tab on the leeward side. For example, if a boat is listing to the port side, the port tab would be raised and the starboard tab would be lowered.
Trim tabs are small, adjustable fins attached to the rear of a boat that help to keep it stable and improve handling. They work by adjusting the angle of attack of the rudder, which controls the boat's direction and speed. Most trim tabs are controlled by an electric motor operated from the cockpit, while some "smart" trim tabs are controlled by a computer that automatically adjusts the tabs to maintain the desired attitude and heading, even in rough seas.
In addition to correcting listing, trim tabs offer several other benefits. They can help a boat get on plane faster and flatter, improve visibility, increase efficiency, and reduce fuel consumption. Trim tabs are particularly useful for novice boaters or those who often find themselves in rough water, as they provide stability and help keep the craft on course. They are also handy when towing a skier or other object behind the boat.
While trim tabs offer many advantages, they are not required on recreational boats and some boaters choose not to use them. They can also be expensive to install, with costs ranging from $300 to $700 or more. Additionally, trim tabs require regular maintenance and cleaning to prevent corrosion and failure.
Overall, automatic trim tabs can be a valuable tool for correcting listing and improving the performance and handling of a boat. However, they may not be necessary or cost-effective for all boaters.
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How to install automatic tabs
Installing automatic trim tabs can be done in a few hours, but it is a complex process that requires careful measurements and the right tools. Here is a step-by-step guide on how to install automatic trim tabs:
Planning and Preparation
First, you need to select the right trim tab size for your boat. The general rule is to choose the widest span tabs that will fit on your boat's transom, as this provides the most effective surface area for lift. For boats with maximum speeds of 40MPH, Bennett Marine recommends at least one inch of trim tab span (per side) for every foot of boat length.
Next, you need to measure the available space on your transom and consider any limitations. Make sure to measure the longest plane span possible between the outside edge of the transom and the centerline, subtracting 3-4 inches for outer edge clearance and 8-12 inches for centerline clearance.
Installation Process
Now you are ready to begin the installation process:
- Assemble the trim plates by bolting them together with their hinges, brackets, and zinc anodes (if you are using them in saltwater).
- Mount the trim plates to the bottom of the transom using sheet metal screws. Make sure they are positioned correctly, allowing for the necessary clearances.
- Mount the upper hardware, including the gas actuators and transom brackets, using the included templates. Ensure that each actuator is perpendicular to its hinge/plate.
- Adjust the angle of the tabs using a 25-degree template. The lift pressure provided by the tabs can be adjusted through a range of five different settings.
- Install the switch on the dashboard near the helm. Drill a hole, depending on the size of the switch, and connect the switch to power.
- Run the wiring harness from the switch to the back of the boat and connect it to the power leads from the electric actuators.
- For hydraulic tabs, install the hydraulic power unit (HPU) inside the boat in a dry location using the supplied bracket.
- Run hydraulic tubing between the transom and the HPU, filling the reservoir with automatic transmission fluid.
- Purge the hydraulics by setting the tabs to the maximum down angle for 15 seconds, then raising them to the maximum up position for 15 seconds. Repeat this process a couple of times to remove air from the system.
- Refill the fluid level in the reservoir.
Testing and Fine-Tuning
Once the installation is complete, it is time to test your new automatic trim tabs:
- Put your boat in the water and enjoy improved performance and control.
- When accelerating, bring the tabs down slightly to help trim the bow and get the boat on plane faster.
- Fine-tune your trim tab usage through trial and error to find the optimum trim angle for your boat.
- When running at speed, use the tabs to keep the boat's bow lower, maintaining a trim angle of around 4-5 degrees.
- If you are experiencing a heavy crosswind, lower the tab on the windward side of the hull to bring the boat back to level.
Remember to always operate your boat with safety in mind, and enjoy your new automatic trim tabs!
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The cost of automatic tabs
Automatic trim tabs are essential for adjusting the running angle or position of your boat. They are especially useful if your boat does not look balanced in the water, or if you want to reduce the chance of it capsizing. They can also increase boat speed, efficiency, and overall safety.
There are a variety of automatic trim tabs available on the market, with prices ranging from $120 to $3500. Here are some popular options:
Bennett Marine, Inc AP000A1HA Autotrim Pro for Classic, Beige
This is an affordable option at around $487. It is quick to detect imbalance and helps to balance your boat immediately. It also comes with a helm display and control unit, and has top-notch customer service. However, it is not suitable for very large boats and does not support the nmea2000 port.
Nauticus SX9510-80 Smart Tab SX Series Trim Tabs
This is one of the cheapest options, costing around $120. It operates quietly and comes with up to 5 years of warranty for actuators. It is made with anti-rust material and does not need pre-operation coating. However, it performs poorly in cold waters and is not suitable for pontoons. Switching from automatic to manual use is also difficult.
Lenco Marine Inc 15101-104 9″ x 12″ Standard Trim Tab Kit
This product is priced between $550 to $850, depending on your location. It is one of the fastest automatic trimmers on the market and operates quietly. You also do not need to winterize this product. However, you will need to add anti-fouling paint, and it is not easy to retract the trims. Customer service for this product is also reported to be poor.
Bennett Marine 18″ x 12″ Bennett 1812EIC Hydraulic Trim Tab Set with Electronic Indicator Control-18 x 12″
This hydraulic-style automatic tab costs around $870. It is easy to switch from automatic to manual, and it is a good option if you store your boat in the water. It is also cheap to repair and has readily available spare parts. However, the hydraulic pump may leak, and it requires a lot of space for installation. Additionally, it does not include zinc anodes.
Zipwake ZW2011145 Series-S Fully-Automatic Dynamic Trim Control System Kit Box with Fast-Acting Interceptors – KB300-S
This is one of the most expensive options, ranging from $2700 to $3500. It is a newer product that is gaining popularity, especially for larger boats. It features brushless motors that are almost silent and comes with a built-in 3D-Gyro, GPS, and Accelerometers. It is compatible with 20-60 foot boats. However, it is not necessary for heavy slow boats, and the warranty period is only 2 years.
Bennett Complete Kit Bolt Electric Trim Tab (BOLT129) with Integrated Helm Control (OBI9000E), 12 x 9 inches FO-4322
This fully electric automatic trim tab costs around $1100. It is made with fiberglass and filled with neon. The helm control has a 3-year warranty, and the actuator has a lifetime warranty. It is also easy to install and is a popular product, so you can easily find "how-to" articles online. However, it is slow to respond to boat imbalance, requires coating before use, and does not include a zinc anode.
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The pros and cons of automatic tabs
Automatic tabs can be a great addition to your boat, helping to improve performance and keep your vessel level. But are they the right choice for every boat and every boater? Let's take a look at the pros and cons of automatic tabs to help you decide.
The Pros of Automatic Tabs:
- Improved Performance: Automatic tabs can help your boat get on plane faster and improve overall efficiency. This means you'll spend less time getting up to speed and more time enjoying your time on the water.
- Correct Listing: One of the biggest advantages of automatic tabs is their ability to correct listing (roll). This means that your boat will stay level, even when faced with shifting weights, crew movement, or windy conditions. This can lead to a smoother, more comfortable ride for you and your passengers.
- Increased Visibility: By reducing bow rise, automatic tabs can improve visibility, making it easier and safer to navigate your vessel.
- Adjustability: Automatic tabs can be adjusted to compensate for changes in speed, sea conditions, and shifting weights. This dynamic adjustability ensures your boat always runs at its optimal angle.
- Correct Porpoising: If your boat experiences rhythmic bouncing (porpoising), automatic tabs can help correct this issue, leading to a smoother ride without sacrificing speed.
- User-Friendly: Automatic tabs, such as the AutoTrim Pro, offer a user-friendly experience. With automatic tab control, you can also take manual control at any time, giving you the best of both worlds.
The Cons of Automatic Tabs:
- Cost: Adding automatic tabs to your boat may come with a significant cost, especially if customisation or professional installation is required.
- Maintenance: As with any mechanical system, automatic tabs will require regular maintenance and fluid checks to ensure optimal performance and avoid malfunctions.
- Complexity: While automatic tabs offer convenience, they also add complexity to your vessel's systems. This may be a concern for those who prefer a simpler, more traditional boating experience.
- Dependency: Over-reliance on automatic tabs may reduce your ability to manually trim and adjust your boat. It's important to maintain a good understanding of manual trimming techniques for situations where automatic tabs may not be available or functioning properly.
In conclusion, automatic tabs offer a range of benefits that can enhance your boating experience, particularly in terms of performance, stability, and visibility. However, they also come with additional costs, maintenance requirements, and system complexity. Ultimately, the decision to install automatic tabs depends on your specific needs, boating conditions, and personal preferences.
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How to maintain automatic tabs
Maintaining automatic trim tabs on your boat is essential for optimal performance and safety. Here are some detailed instructions to help you keep your automatic trim tabs in good condition:
Check Fluid Levels for Hydraulic Systems:
- With the trim tabs fully retracted, the fluid level should be about 2 inches from the bottom of the reservoir (approximately 22 ounces).
- To refill, locate the Lexan cover and filler plug at the front left corner of the reservoir.
- Only use automatic transmission fluid (ATF) to refill.
Clean Electrical Connections:
- Periodically check all components for clean electrical connections.
- Ensure there is no accumulated dirt, grease, or corrosion on the connections.
Prevent Electrolysis:
- For saltwater use only, attach zinc anodes to deter electrolysis.
- Ensure the zinc makes direct contact with stainless steel, but do not paint it.
Paint Trim Tabs:
- To discourage marine growth, clean the surface of any grease, oil, or dirt.
- Apply two coats of epoxy metal primer, followed by two coats of anti-fouling paint.
Address Malfunctions Immediately:
If you notice any issues with your automatic trim tabs, take immediate action to correct them.
Check Wiring Connections:
Occasionally inspect wiring connections to ensure they are not loose or corroded.
Mounting HPU and Control Units:
Ensure that the HPU (pump) and control units are mounted in a dry location to avoid drenching and consequent failure.
Inspect HPU Fluid Level (for Hydraulic Systems):
For hydraulic systems, regularly check the HPU fluid level to ensure it is at the appropriate level.
Avoid Over-trimming:
Do not over-trim, especially at high speeds, as it can cause the bow to dig in, leading to undesirable listing and potential safety hazards.
Trim Tab Usage While Underway:
When underway, avoid moving one trim tab significantly farther down than the other to prevent unintended listing.
By following these maintenance tips, you can help ensure that your automatic trim tabs function effectively and safely. Regular care and inspections will contribute to the longevity and performance of your boat's trim tabs.
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Frequently asked questions
Automatic trim tabs are a type of boat accessory that can be used to improve the performance and handling of a boat. They are small, adjustable fins attached to the rear of the boat, which help to keep it stable and improve visibility.
Automatic trim tabs work by adjusting the angle of the boat's rudder, which in turn affects the boat's direction and speed. They can be controlled by an electric motor operated from the cockpit, or in some cases, they may be controlled by a computer system, automatically adjusting to maintain the desired heading.
The benefits of automatic trim tabs include improved speed, handling, and fuel efficiency. They can also help to prevent the boat from capsizing or becoming unstable in windy or wavy conditions. However, they are not necessary for all boats and can be costly to install, so it is important to consider your specific boating needs and budget before making a decision.