Other factors that influence performance
It is important to keep exhaust back pressure low.
Power losses caused by back pressure are directly
proportional to the increase in back pressure, which
also increases exhaust temperature.
Boat weight is another important factor that influences
speed. Increased boat weight has a great influence on
speed, especially on planing or semi-planing hulls. A
new boat that is tested with half full fuel and water tanks
and without a load, may lose 2-3 knots when it is driven
fully loaded with fuel, water and equipment for the voy-
age.
Boats made from fiberglass reinforced plastic absorb
water when they are afloat which means they become
heavier over time. Marine fouling is an often-over-
looked problem that greatly affects boat performance.
Engine Characteristics, Engine Performance
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Summary of Contents for IPS650
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