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Trim Tab Sizing Guidelines
What size trim tab is right for me?
Many factors affect the choice of properly sized trim tabs, and the
ultimate responsibility for selection is up to you, the boat owner. To help
you decide, Bennett Marine offers you a few guidelines below. If you still
have questions about the size you need, just contact us and we’ll be happy
to walk you through it.
 General
Guidelines
These sizing recommendations are based on average performance. Your choice
may vary based on power, engine configuration, weight distribution, type of
boat, and use. The greater the surface area, angle of deflection and/or
speed of the water flowing under the trim tab, the greater the lift.
When making a choice between trim tab sizes, remember that the
largest trim tabs that will comfortably fit on the transom will be the most
efficient.
As a rule, choose at least one inch of trim tab span (per side) for every
foot of boat length. (Examples: 22-foot boat = no less than 24″ x 9″,
36-foot boat = no less than 36″ x 9″.
Span = side to side measurement
Chord = fore to aft measurement
Whenever possible, choose a 9″ chord trim tab, and gain lift through a
longer span. The span of the trim tab has more of an effect on the amount of
lift. However, a longer chord can be used effectively, and there are
situations where you may need to use a 12″ chord. Click Here to See When to
Use a 12″ Chord
Measuring
Choose the approximate tab size for your boat using this sizing chart. Make
sure the tabs will fit your transom using the diagrams below as a guideline.
When measuring, disregard the strakes and follow the Vee of the hull.
The sizing guidelines below are intended to assist in the selection of
tab sizes for vessels that do not currently have tabs installed by the boat
manufacturer. For assistance with unique applications not outlined
below, please call us.
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Boat Length
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Trim Tab Size (span x chord)
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15’-19’ (4.5-5.8 m)
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8” x 10” (20 x 25 cm) M80
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17’-19’ (5.2-5.8 m)
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10” x 12” (25 x 30 cm) M120
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19’-24’ (5.8-7.3 m)
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12” x 9” (30 x 23 cm)
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19’-24’ (5.8-7.3 m)
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12” x 12” (30 x 30 cm)
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20’-23’ (6.0-7.0 m)
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18” x 9” (46 x 23 cm)
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22’-27’ (6.7-8.3 m)
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18” x 12” (46 x 30 cm)
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22’-27’ (6.7-8.3 m)
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24” x 9” (61 x 23 cm)
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25’-31’ (7.6-9.1 m)
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24” x 12” (61 x 30 cm)
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25’-31’ (7.6-9.1 m)
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30” x 9” (76 x 23 cm)
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25’-31’ (7.6-9.1 m)
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30” x 12” (76 x 30 cm)
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32’-38’ (9.7-11.6 m)
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36” x 9” (91 x 23 cm)
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32’-38’ (9.7-11.6 m)
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36” x 12” (91 x 30 cm)
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36’-44’ (11.0-13.4 m)
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42” x 9” (107 x 20 cm)
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36’-44’ (11.0-13.4 m)
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42” x 12” (107 x 30 cm)
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42’-50’ (12.8-15.2 m)
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54” x 9” (137 x 23 cm)
|
Why do I need Trim Tabs?
You may not be familiar with them, but you’ve probably experienced the
problems that trim tabs solve for boaters all over the world. After using
Bennett systems for years – and discovering just how durable and serviceable
they can be – our customers can’t imagine boating without them.
Do These Conditions Sound Familiar?
 As
your boat slows from maximum speed, it begins to settle at the stern or
“squat,” creating an inefficient, untrimmed condition. At this attitude you
use more fuel to drive the boat.
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.
Also because of significant hull drag and extreme prop angle, fuel economy
is poor.
Uneven weight distribution makes your boat harder to handle, even harder
to get up on plane, and it causes your boat to list to one side. Your
passengers complain when you tell them to move from one side to the other.
As a boater you know that no two boating days are ever alike thanks to
ever-changing weight, weather and water conditions. Bennett Trim Tabs are
designed to adjust for these changing conditions and provide lift in order
to give you the best possible running attitude.
Get the Best Ride Possible
 Bennett
Trim Tabs help your boat operate as intended over a broader range of
conditions. They give you more control than you ever had before. You can
improve the performance of your boat through properly sized trim tabs that:
- Get you up on plane quickly
- Allow you to plane at speeds lower than designed planing speed
- Adjust the boat’s attitude for changes in speed, sea conditions and
shifting weight
- Correct listing on either side of the boat
Bennett Trim Tabs reposition the boat’s bow to cut through the water.
This gives you several advantages:
- Less drag and engine laboring, which translate into increased
performance, greater speed, and reduced fuel consumption
- Reduced pounding, which means greater comfort
- Greater visibility, which increases safety
Bennett Trim Tabs help your boat operate as intended over a broader range
of conditions. They give you more control than you ever had before. You can
improve the performance of your boat through properly sized trim tabs that:
- Get you up on plane quickly
- Allow you to plane at speeds lower than designed planing speed
- Adjust the boat’s attitude for changes in speed, sea conditions and
shifting weight
- Correct listing on either side of the boat
Bennett Trim Tabs reposition the boat’s bow to cut through the water.
This gives you several advantages:
- Less drag and engine laboring, which translate into increased
performance, greater speed, and reduced fuel consumption
Reduced pounding, which means greater comfort
Greater visibility, which increases safety
Did We Mention Savings on Fuel?
Maintaining plane at a lower RPM is where the boat starts to achieve its
maximum efficiency. Trim tabs provide the additional lift so that the
throttle can be decreased without losing plane, adding both fuel economy and
range. Some boaters have experienced as much as 30% fuel efficiency gains.
With all the advantages and efficiencies created, Bennett Trim Tabs
virtually pay for themselves.
The Bennett Advantage
Performance:
Turn a teeth-jarring experience into a more comfortable ride.
- Increase Speed
- Reduce Pounding
- Correct for Listing
- Eliminate Porpoising
- Offset Prop Torque
Efficiency:
Bennett Trim Tabs are one of the few boat accessories that can pay for
themselves. Some boaters have experienced as much as 30% fuel efficiency
gains.
- Reduce Fuel Consumption
- Reduce Engine Laboring
- Eliminate Squatting
- Reduce Engine Laboring
Safety:
Relax at the wheel thanks to greater control over your bow high position.
- Improve Visibility
- Reduce Wake
- Improve Handling
- Reduce Hull Stress
Trim Tab Sizing Guidelines
What size trim tab is right for me?
Many factors affect the choice of properly sized trim tabs, and the
ultimate responsibility for selection is up to you, the boat owner. To help
you decide, Bennett Marine offers you a few guidelines below. If you still
have questions about the size you need, just contact us and we’ll be happy
to walk you through it.
General
Guidelines
These sizing recommendations are based on average performance. Your choice
may vary based on power, engine configuration, weight distribution, type of
boat, and use. The greater the surface area, angle of deflection and/or
speed of the water flowing under the trim tab, the greater the lift.
When making a choice between trim tab sizes, remember that the
largest trim tabs that will comfortably fit on the transom will be the most
efficient.
As a rule, choose at least one inch of trim tab span (per side) for every
foot of boat length. (Examples: 22-foot boat = no less than 24? x 9?,
36-foot boat = no less than 36? x 9?.
Span = side to side measurement
Chord = fore to aft measurement
Whenever possible, choose a 9? chord trim tab, and gain lift through a
longer span. The span of the trim tab has more of an effect on the amount of
lift. However, a longer chord can be used effectively, and there are
situations where you may need to use a 12? chord. Click Here to See When to
Use a 12? Chord
Measuring
Choose the approximate tab size for your boat using this sizing chart. Make
sure the tabs will fit your transom using the diagrams below as a guideline.
When measuring, disregard the strakes and follow the Vee of the hull.
The sizing guidelines below are intended to assist in the selection of
tab sizes for vessels that do not currently have tabs installed by the boat
manufacturer. For assistance with unique applications not outlined
below, please call us.
|
Boat Length
|
Trim Tab Size (span x chord)
|
|
15’-19’ (4.5-5.8 m)
|
8” x 10” (20 x 25 cm) M80
|
|
17’-19’ (5.2-5.8 m)
|
10” x 12” (25 x 30 cm) M120
|
|
19’-24’ (5.8-7.3 m)
|
12” x 9” (30 x 23 cm)
|
|
19’-24’ (5.8-7.3 m)
|
12” x 12” (30 x 30 cm)
|
|
20’-23’ (6.0-7.0 m)
|
18” x 9” (46 x 23 cm)
|
|
22’-27’ (6.7-8.3 m)
|
18” x 12” (46 x 30 cm)
|
|
22’-27’ (6.7-8.3 m)
|
24” x 9” (61 x 23 cm)
|
|
25’-31’ (7.6-9.1 m)
|
24” x 12” (61 x 30 cm)
|
|
25’-31’ (7.6-9.1 m)
|
30” x 9” (76 x 23 cm)
|
|
25’-31’ (7.6-9.1 m)
|
30” x 12” (76 x 30 cm)
|
|
32’-38’ (9.7-11.6 m)
|
36” x 9” (91 x 23 cm)
|
|
32’-38’ (9.7-11.6 m)
|
36” x 12” (91 x 30 cm)
|
|
36’-44’ (11.0-13.4 m)
|
42” x 9” (107 x 20 cm)
|
|
36’-44’ (11.0-13.4 m)
|
42” x 12” (107 x 30 cm)
|
|
42’-50’ (12.8-15.2 m)
|
54” x 9” (137 x 23 cm)
|
Why do I need Trim Tabs?
You may not be familiar with them, but you’ve probably experienced the
problems that trim tabs solve for boaters all over the world. After using
Bennett systems for years – and discovering just how durable and serviceable
they can be – our customers can’t imagine boating without them.
Do These Conditions Sound Familiar?
As
your boat slows from maximum speed, it begins to settle at the stern or
“squat,” creating an inefficient, untrimmed condition. At this attitude you
use more fuel to drive the boat.
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.
Also because of significant hull drag and extreme prop angle, fuel economy
is poor.
Uneven weight distribution makes your boat harder to handle, even harder
to get up on plane, and it causes your boat to list to one side. Your
passengers complain when you tell them to move from one side to the other.
As a boater you know that no two boating days are ever alike thanks to
ever-changing weight, weather and water conditions. Bennett Trim Tabs are
designed to adjust for these changing conditions and provide lift in order
to give you the best possible running attitude.
Get the Best Ride Possible
Bennett
Trim Tabs help your boat operate as intended over a broader range of
conditions. They give you more control than you ever had before. You can
improve the performance of your boat through properly sized trim tabs that:
- Get you up on plane quickly
- Allow you to plane at speeds lower than designed planing speed
- Adjust the boat’s attitude for changes in speed, sea conditions and
shifting weight
- Correct listing on either side of the boat
Bennett Trim Tabs reposition the boat’s bow to cut through the water.
This gives you several advantages:
- Less drag and engine laboring, which translate into increased
performance, greater speed, and reduced fuel consumption
- Reduced pounding, which means greater comfort
- Greater visibility, which increases safety
Bennett Trim Tabs help your boat operate as intended over a broader range
of conditions. They give you more control than you ever had before. You can
improve the performance of your boat through properly sized trim tabs that:
- Get you up on plane quickly
- Allow you to plane at speeds lower than designed planing speed
- Adjust the boat’s attitude for changes in speed, sea conditions and
shifting weight
- Correct listing on either side of the boat
Bennett Trim Tabs reposition the boat’s bow to cut through the water.
This gives you several advantages:
- Less drag and engine laboring, which translate into increased
performance, greater speed, and reduced fuel consumption
Reduced pounding, which means greater comfort
Greater visibility, which increases safety
Did We Mention Savings on Fuel?
Maintaining plane at a lower RPM is where the boat starts to achieve its
maximum efficiency. Trim tabs provide the additional lift so that the
throttle can be decreased without losing plane, adding both fuel economy and
range. Some boaters have experienced as much as 30% fuel efficiency gains.
With all the advantages and efficiencies created, Bennett Trim Tabs
virtually pay for themselves.
The Bennett Advantage
Performance:
Turn a teeth-jarring experience into a more comfortable ride.
- Increase Speed
- Reduce Pounding
- Correct for Listing
- Eliminate Porpoising
- Offset Prop Torque
Efficiency:
Bennett Trim Tabs are one of the few boat accessories that can pay for
themselves. Some boaters have experienced as much as 30% fuel efficiency
gains.
- Reduce Fuel Consumption
- Reduce Engine Laboring
- Eliminate Squatting
- Reduce Engine Laboring
Safety:
Relax at the wheel thanks to greater control over your bow high position.
- Improve Visibility
- Reduce Wake
- Improve Handling
- Reduce Hull Stress
Bennett ST9 12x9 Performance Sport Tab Systems with One Boat Indicator Control
Model: ST9OBI
- Get on plane fast and stay on plane at intermediate speeds
- Correct listing and uneven loads
- Reduce pounding and eliminate porpoising
- Improve visibility and safety
- Low maintenance with long-term value
Enjoy the sophisticated black-powder-coated finish of Performance Tabs. Manufactured with heavy-gauge reinforced stainless steel and powerful hydraulic actuators. Performance Tabs combine strength, durability, and good looks to achieve your boat’s
What's in the Box:
- (2) Trim plane assemblies
- (2-4) Hydraulic actuators (A1101ARC)
- (1) Hydraulic power unit (V351HPU1)
- Hydraulic tubing and hardware
- OBI9000H One Boat Indicator Control
 WARNING: This product can expose you to chemicals including Di-n-hexyl Phthalate, DnHP, which is known to the State of California to cause reproductive harm, and Vinyl Chloride which is known to the State of California to cause cancer. For more information go to P65Warnings.ca.gov.
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Note: The price is subject to change at any time without any notice. Not responsible for any typographical errors. Any products can be cancelled from sale at any time.
- All products sold here come with Full Manufacturer's Warranty
- Email us at
- [email protected] for any quesitons
- WARNING: This product can expose you to chemicals including Di-n-hexyl Phthalate, DnHP, which is known to the State of California to cause reproductive harm, and Vinyl Chloride which is known to the State of California to cause cancer. For more information go to P65Warnings.ca.gov.
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