How Insta-Trim Boat Levelers Work
Insta-Trim Boat Leveler tabs are two stainless steel planes installed on the
transom. As the hydraulic cylinders deflect the trim tabs, water flow is
This waterflow creates upward pressure under the trim tabs, raising the stern.
As the stern rises the bow lowers (figure 1). Because proper trim tab surface
area is essential, larger and/ or slower boats require larger trim tabs than
Insta-Trim Boat Leveler Tabs employ the force of hydraulics for smooth
trimming action. When the trim tab rocker switch is pressed, electrical current
sent to the hydraulic motor pump unit. This signal activates the electic motor,
creating fluid pressure. Valves on motor pump unit open, channeling the
required amount of fluid to the actuators. When the trim tab rocker switch is
released, the valve close, capturing the fluid in the actuators hydraulic
Thus trim tabs hold their position.
Insta-Trim Boat Leveler Tabs operate in reverse of what you might think. The
port trim tab lifts the port stern which lowers the starboard bow. With
properly installed trim tabs, you will not be as aware of this reverse function
control functionis based on the direction you wish to move the bow (figure 2).
*Do not overtrim, particularly at high speeds, as the bow will dig in and
wave action may cause the boat to veer.
*While Underway, do not move one trim tab significantly farther down than
the other as undesirable listing could occur.
*Use your trim tab rocker switch with caution.
*For best maneuverability, trim tabs should be fully retracted in a following
sea or when running an inlet.
*Improper use of trim tabs can cause accident or injury
*make periodic checks of hydraulic lines, switches, wiring and fluid levels,
looking for corrosion, fatigue and proper oil levels.
Insta-Trim boat leveler tabs have significant effect on the operation and
versatility of your boat, and nobody knows your boat better than you. So the
best learning method is to spend time getting familiar with your boat's reaction
the trim tabs. As your experience with insta trim boat leveler tabs increases,
so too will you enjoyment. Always operate your boat with safety first in mind,
"It's Smooth Boating Ahead"!!!!
How to Use Your Insta-Trim Boat Leveler Trim Tabs
The proper use of Insta-Trim Boat Leveler Tabs becomes very easy after a
short time. Here are some general guidelines to get you started:
Getting and staying trimmed
Most boats "break over" (get on a plane) at a
particular speed. This speed is determined by weight distribution, water
conditions, etc. Insta-Trim Boat Leveler Tabs enable your boat to plane at
speeds lower than natural planing speed. As the throttle is pushed, the stern
squats and the bow rises (figure 3). In short bursts, the trim tab rocker
are pushed in the "BOW DOWN" position, moving both trim tabs. The boat
reacts as the stern rises and the bow "breaks over", resulting in, among other
things, increased visibility and speed (figure 4). If over trimming occurs as
boat gains speed, the rim tabs can be retracted by pressing "BOW UP".
(When overtrimmed, the boat plows, reducing maneuverability).
While learning to use trim tabs, begin buy pressing the trim tab rocker switch
(figure 5) in half second bursts for gradual trimming. A momentary delay occurs
from the time the trim tab rocker switch is pressed to the time the boat reacts.
avoid overtrimming, allow enough time between bursts to permit the boat to
respond to the trim tabs. This time depends on the boat's speed.
A good way to learn your boat's optimum attitude is to conduct a test by
running lightly loaded at a fairly high speed in flat water. During this test,
the bow in relation to the horizon. This situation should reveal the boat's
best running attitude. Then, under normal operating condition, use the trim tabs
to reproduce the same attitude achieved during the test. You will know the ideal
attitude by the diminished wake, reducing laboring of engine(s), and the
rpm's...all at the same throttle setting.
When running in a chop or heavier seas, press "BOW DOWN", positioning
the bow to cut through the waves. This action provides a drier, more comfortable
ride. In a following sea or when running an inlet, the trim tabs should be
fully retracted for maximum rudder response.
When steering from a bridge or tower, a good trimming method is to watch
the bow spray or stern wake and the roostertail. In an untrimmed condition, the
spray from the bow is far aft on the hull, the wake is high, and the roostertail
pronounced. When trimmed, the bow spray is farther forward, the wake is reduced,
and the rooster tail is smaller and farther behind the boat. In addition, when
trimmed, the rpm's increase.
Correction of a List
Insta-Trim Boat Leveler Tabs are operated individually
to correct a listing condition. The trim adjusts the boat's attitude in the
direction the trim tab rocker switch is pressed. If the port bow is high, press
left-hand "BOW DOWN" direction on the trim tab rocker switch and the port
bow lowers (figure 6). If the starboard bow is high, press the right-hand "BOW
DOWN" direction and the starboard bow lowers. Do not think about what the
trim tabs are doing; just concentrate on your trim tab rocker switch. Note: The
boat should be trimmed fore and aft before correcting for a list.
Using Trim Tabs with Power Trim
1.Adjust the trim tabs to achieve planing
2.Use the power trim to position the prop path
parallel to the waterflow
3.If necessary, re-adjust the trim tabs to "fine
tune" (figure 7).Insta-Trim boat Leveler
Tabs let you get the most out of your power trim because the trim tabs are
trimming the hull while the power trim is trimming the prop.
Correction of porpoising
Press "BOW DOWN" in half second bursts. As
the trim tabs deflect, porpoising subsides and speed should remain the same or
increase. Only a slight amount of trim tab deflection should be necessary.
(IMPORTANT: READ "SAFETY PRECAUTIONS")
Trim Tabs: 12 - Gauge 304 Stainless Steel
Hydraulic Cylinders: Made of High Impact Fiberglass-Filled Nylon
Swivel Type Mounting Brackets: Made of High Impact Fiberglass-Filled
Trim Tab Rocker Switch: Are hermetically sealed, and have silver contact
points. 12-volt systems use 20-amp in-line fuse (24V & 32V use proportionally
Hydraulic Hose: Hose has 1/4 inch inside diameter 1/2 inch outside
400lb.s working pressure and 1,600 burst pressure.
Wire Harness: Wire Colors and their functions:
12-Volt Tab Locators Parts List
|TBL 201......Light panel
TBL 201-A....Light panel instrument w/wire for flybridge..........
TBL 202......Bracket for light panel......................................
TBL 203......Nut for light panel...........................................
TBL 204......Sensor for piston cap.......................................
TBL 204-A....Brass screw for piston cap sensor.....................
TBL 205......Outside cylinder for hyd. cyl. w/25' ribbon harness
TBL 205-B....Outside cylinder for hyd. cyl. w/40' ribbon harness
TBL 205-C....Outside cylinder for hyd. cyl. w/50' ribbon harness
TBL 206......Bracket for outside sensor................................
TBL 207......Brass screw for bracket for outside sensor...........