Edgewater Networks 225 Express, Руководство пользователя

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Chapter 3 Pr Chapter 3 Pr
Chapter 3 Pr Chapter 3 Pr
Chapter 3 Propulsion System opulsion System
opulsion System opulsion System
opulsion System
1 8 1 8 1 8 1 8 1 8 EdgeWater 225 Express
its relationship to the size and weight of the boat.
Propeller sizes are determined by two numbers, which appear on different propellers at various
locations. They are listed in sequence, for example 13 x 17. The first number is the diameter
of the propeller and the second is the pitch. Pitch is the theoretical distance the propeller moves through
the water with each complete revolution. The larger the number
the greater the theoretical movement. It also follows that the
larger the number the greater horsepower is required to turn it.
With a load which is “normal”, or usual for your boating activities,
the engine should be able to reach its maximum operating RPM
range at wide open throttle (WOT). With a light load on smooth
water, the engine should reach its manufacturer’s rated maximum
operating RPM at wide open throttle (WOT) and maximum trim.
If it does not, you may have a propeller which has too much pitch.
If it goes beyond the maximum recommended RPM range, you
may have too little pitch. Neither condition is good for the engine.
You will get shorter engine life and poorer performance than your
boat and motor were designed to provide.
Several factors affect propeller size selection which include, but are not limited to load conditions
of boat, sea conditions, engine mounting height, shape and geometry of propeller. On factory
rigged boats, EdgeWater and Yamaha have selected the propellerwhich provides the best overall
performance and economy. Higher than average loads, with a full tank of fuel, presence of bottom
paint or a dirty bottom, and other factors may prevent optimum performance with the factory supplied
propeller. Changing a propeller size to compensate for other factors is the owner’s perogative.
3.4 Engine Power T 3.4 Engine Power T
3.4 Engine Power T 3.4 Engine Power T
3.4 Engine Power Tilt and T i l t a n d T
i l t a n d T i l t a n d T
i l t a n d Tr i m r i m
r i m r i m
r i m
The power tilt and trim system on your outboard provides
the ability to optimize the running angle of your
EdgeWater 225 EX or to allow for load and sea conditions. Moving
the outboard lower unit toward the transom is generally referred to
as trimming “in”, while moving the outboard lower unit away from
the transom is referred to trimming “out”. It is generally best to
have the engine trimmed in for acceleration from displacement to
planning mode. This brings the bow down and requires less fuel
and effort on the engine’s part to plane off the hull.
The first 20
o
of movement aft of the transom is referred to as trim
and is the area generally used to operate the boat while on plane.
The area beyond the first 20
o
is referred to as tilt and is usually
reserved for operating in shallow water or pulling up on a beach.
While running under normal conditions, the bow should be in a 3
o
to 5
o
up angle to maximize the hull’s ride and performance. When
sea conditions are rougher than normal, bringing the bow slightly
down may improve the ride and will also allow the boat to remain
on plane at a lower speed.
Watch the hoses and cable on your engine as it is tilted to its
Engine
Tilt
Max
Trim Tilt
Under