27
General arrangement and planning
Performance requirements
What are the top speed and cruising speed require-
ments?
The boat/vessel
Define the category of hull type:
• Displacement
• Semi-planing
• Planing
Consider the boat size and estimate weight, LCG
(Longitudinal Centre of Gravity) etc. Drawing infor-
mation (line drawings) is requested, in the best case
resistance data from tank tests.
Propulsion system
Search for the most suitable propulsion system and
engine geometry. Think about the characteristics of
different propulsion systems.
Choice of engine
To provide the best performance and characteristics
of an installation it is important to elaborate and iter-
ate the information shown in the illustration below.
Trial and error is often needed to finally find the es-
sential set of "performance" requirements the instal-
BOAT
VESSEL
REVERSE GEAR
AND PROPELLER
PERFORMANCE
LIMITATIONS
PROPULSION
SYSTEM
POWER
REQUIREMENT
ENGINE
lation aims to fulfil. Analysis of each contribution may
vary depending on the dominating priorities such as
top speed, economy, safety, etc. Consult Volvo Penta
literature and computer programs or contact the Volvo
Penta organisation for assistance.
Limitations
Consider possible limitations such as engine and pro-
peller dimensions.
Power requirement
Use the data to define the required power. Do not
forget to consider power losses due to PTOs, climate,
fuel qualities etc.
Engine
Consult Volvo Penta sales literature for the corre-
sponding engine, giving minimum required power at
the correct duty rating. Check the available reverse
gear ratios.
Reverse gear and propeller
Calculate for the optimum gear ratio as well as pro-
peller type and size.
Summary of Contents for D11 series
Page 1: ...Marine Propulsion Diesel Engines Installation 1 1 D E D5 D16 series ...
Page 2: ......
Page 208: ...206 References to Service Bulletins Group No Date Concerns ...
Page 209: ...207 Notes ...
Page 210: ...208 Notes ...
Page 212: ...7748655 English 11 2007 ...