Marquis 420 Sport Coupe Owner's Manual page 93

O M
perating and aneuvering
Operating at Planing Speed
It is important to get on plane as soon as possible and avoid speeds that cause
the yacht to plow through the water with the yacht in a bow-high attitude. A bow-high
attitude obstructs your vision and limits the yacht's handling and performance
capabilities.
Trim Tabs
TrIM CONTrOL PANEL
Do not overtrim your yacht. When adjusting the trim tabs, press their control switches
for only one-half second at a time, then allow the yacht to respond. Continue to adjust
the trim tabs in this manner until the yacht is at the desired trim angle. Over-trimming
can cause the bow to veer and may lead to loss of control.
3837 • U3 10/07
Your yacht has a "planing" hull. A planing hull skims over the water rather
than through it. To do this, however, your yacht first has to reach a certain
speed, called planing speed.
When you first accelerate from a dead stop, the trim angle of the yacht
increases, causing the bow to rise and the stern to drop. If you continue to
accelerate, the yacht eventually achieves plane, which means the bow
slowly drops to a more level attitude.
Once the yacht is on plane, you can back the throttles off to a point where
the hull is still planing but the engines are operating at a fuel-efficient
speed.
The 420SC has a trim system incorporated into its operational controls.
Trim tabs help the yacht get on plane by allowing you to adjust the attitude
of the yacht for variables such as load, passengers, seas or wind. Use the
tabs at planing speeds to make minor adjustments in the fore-to-aft and
beam-to-beam angle of the yacht.
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