Boating's Best Attitude Since 1960
Since 1960 Bennett Marine has been the world leader in Trim Tab Technology. In fact Charles Bennett invented the modern Trim Tab. Over the years the name Bennett Marine has become synonymous with quality product and outstanding customer service. Look around the boat yard, ask your friends, check out what the top boat builders install, we are confident your choice will be Bennett Trim Tabs.

Use the information to find out how installing Bennett Trim Tabs will increase your boat's performance and your enjoyment. We look forward to sharing our experience with you. Bennett Marine products are available world wide at virtually any source of marine equipment. 

Most boats are designed to plane at a particular speed and weight distribution. However, as weight increases (due to additional fuel, passengers, or gear) and/or speed decreases, the stern settles down creating an inefficient, untrimmed condition. As the boat pushes forward, it creates a "hill of water." In this bow-high position visibility is limited and the hull bottom is pounded. In addition, due to significant hull drag and extreme prop angle, fuel economy is poor. Properly sized Bennett Trim Tabs enable your boat to overcome this "hill" and plane at speeds slower than designed planing speed.

As the helm control is pressed, the stern rises, lowering the bow. Without touching the throttle, speed increases and optimum attitude is achieved regardless of speed or weight distribution.

Bennett Trim Tabs reposition the boat's bow to cut through the water reducing pounding, drag, and engine laboring. Repositioning the bow creates greater visibility which increases safety. Reduced pounding means greater comfort. Less drag and engine laboring translate into increased performance, greater speed, and reduced fuel consumption.

With all the advantages and efficiencies created, Bennett Trim Tabs virtually pay for themselves.

	Without Trim Tabs
	With Trim Tabs

THE PRINCIPLE OF BENNETT TRIM TABS
Bennett Trim Tabs are two independent, stainless steel, adjustable afterplanes attached to the bottom edge of the transom. As the helm control is pressed, the trim tabs move into position.

Water-force on the trim tab surface creates upward pressure, thereby raising the stern and lowering the bow. The principle is simple. The results are impressive.

THE BENNETT ADVANTAGES
Performance
Increase Speed • Reduce Pounding • Correct Listing • Eliminate Porpoising • Offset Prop Torque
Efficiency
Reduce Fuel Consumption • Reduce Engine Laboring • Eliminate Squatting
Safety
Improve Visibility • Reduce Wake • Improve Handling • Reduce Hull Stress

How to Use Trim Tabs

GETTING STARTED
The key to obtaining optimal results from trim tabs is to operate them in short “bursts” and let the boat react before making another adjustment. The amount of time between corrections is influenced by the size of the trim tabs and the boat’s speed. This will help avoid overtrimming or ending up with one tab too far down when correcting lateral trim. You will quickly become acquainted with a boat’s particular traits.

TAKE OFF
Properly sized trim tabs can significantly reduce the time needed to get up on plane. They also allow a boat to keep its bow down and stay on plane at lower speeds. As the throttle is advanced the stern of the boat begins to squat, lifting the bow. As the boat accelerates, push the bow down position of the helm control in short bursts. The boat reacts by the stern lifting, the bow coming down, speed increasing, and reduced engine laboring. If you over do it and deflect the tabs too far the boat will end up overtrimmed. When over trimmed, the steering becomes “over sensitive” and wants to pull off course to port or starboard. If this occurs, operate the control “bow up" until the desired attitude is established.

CORRECTING A LISTING CONDITION
As a result of uneven weight distribution, prop torque or wind, a boat runs with a list. Deep "V" hulls are particularly vulnerable to this condition. Running with a list is uncomfortable, as well as unsafe. Bennett Trim Tabs operate independently for effective list correction.  To correct for list, lower the trim tab on the side of the boat that you are listing to.  This will bring the boat level.  

TRIM TABS AND POWER TRIM
It is a common misconception that if a boat has power trim on the outboard or outdrive it does not need trim tabs. Power trim can be used to adjust the boat's attitude, but it is highly inefficient.  A propeller is designed to force the boat forward. When trimming the boat with the prop, the prop must not only push the boat forward but raise the stern as well. In this situation, prop slippage is greatly increased thereby wasting R.P.M.'s. Power trim cannot correct listing, and is ineffective at slower speeds.  Bennett Trim Tabs, in combination with power trim, enable both the hull and prop to be trimmed independently. The trim tabs trim the hull, while the power trim adjusts the prop. The result is optimum performance and efficiency not attainable by the use of power trim alone.

To acheive maximum performance, first adjust the trim tabs to achieve the desired running attitude. Next, use the power trim to position the propeller thrust parallel to the water flow. If necessary, re-adjust the trim tabs to fine tune the attitude. By observing the boat’s speed and engine RPMs the best combination of trim tabs and power trim will be apparent. Trim tab angle indicators and a power trim angle indicator are particularly useful in duplicating effective settings.

TRIMMING TO SEA CONDITIONS
When running into a head sea you want to trim the bow down so the sharp forward sections of the boat do their work cleaving the waves. This provides the most comfortable ride and minimizes stress on the boat (and passengers). In a following sea the tabs should be fully retracted for maximum steering response.

CORRECTION OF PORPOISING
Operate the tabs in very short bursts of about half a second. Continue until porpoising subsides. The objective is to have only a very slight amount of tab deflection, just the amount needed to cure the up and down motion of the bow.

Boat Length	Configuration		Trim Tab Size (span x chord)
15' - 19'	Single I/O, Single Outboard, or Inboard		12" x 9"
17' - 20'	NEW	M80 Sport Tab for Trailered Boats	8" x 10"
19' - 24'	Single I/O, Single Outboard, or Inboard		18" x 9"
20' - 23'	NEW	M120 Sport Tab for Trailered Boats	10" x 12"
19' - 24'	Limited Transom Space or Extra Lift		12" x 12"
22' - 27'	Single I/O or Single Outboard		24" x  9"
22' - 27'	Twin I/O or Twin Outboard		18" x 12"
25' - 30'	Single I/O or Single Outboard		30" x  9"
25' - 30'	Limited Transom Space or Extra Lift		30" x 12"
25' - 30'	Twin I/O or Twin Outboard		24" x 12"
28' - 34'	Inboard		36"   x 9"
28' - 34'	Limited Transom Space or Extra Lift		36" x 12"
28' - 34'	Twin I/O or Twin Outboard		24" x 12"
32' - 38'	Inboard		42" x 9"
32' - 38'	Limited Transom Space or Extra Lift		42" x 12"
36' - 44'	Inboard		48" x 9"
36' - 44'	Limited Transom Space or Extra Lift		48" x 12"
42' - 50'	Inboard		54" x 9"
50' - 60'	Inboard		54" x 12"
60' - 65'	Inboard		60" x 12"
65' - 70'	Inboard		66" x 12"
70' - 80'	Inboard		72" x 12"

BENNETT TRIM TAB KITS 

219-9X12RS

BENNETT SPORT TRIM TAB 

BENNETT TRIM TAB ACCESSORIES 

BENNETT TRIM TAB CONTROLS