FRP Catamaran Hull Form Analysis and Operations Ernest Lam Falmouth Marine School, Killigrew Street, Falmouth, Cornwall, UK, TR11 3QS ABSTRACT This project is a 2 years project. A new 35ft FRP catamaran hull has been chosen to design. This paper will be carrying out the full process of the hull design and calculations. The result of stability shows that the catamaran might be not too stable and resistance might be increasing through water. But because of the time limitation, model is not possible to be created for experiment and study.
Parametric studies for a yacht based on
INTRODUCTION For most of the product design, the design
some other same type of yacht’s Length of All
process always follows the rules of ‘trial and
(LOA), Length of Waterline (LWL), Beam (B)
error’ which means following the steps and see if
Displacement (∆), Volume (∇) and Power (P)
the result satisfies the requirement. Designers
become useful information such as Length-Beam
generally need to repeat the process 10 times or
ratio (LB ratio), Length-Displacement ratio ( LD
even 100 times to achieve the requirement which
ratio ) and Power-Displacement ratio (PD ratio).
where ‘The design Spiral’ came from. (Larsson
(Whatley 2010)
& Eliasson, 2007) For an engine powered
Hull design is one of the most important yacht, main
operations. The reason behind it is because
operations in the design spiral are hull and decks
distinct hull forms have different parametric
design, keel and rudder design, decision of
which gives the yacht a different performances
propeller and engine, hydrostatics and stability
and stability. Designer generally set up a table
and finally evaluation. For other powered yacht
which contain section area and calculate the
such as sail powered or solar powered, more
volume for compare it with the parametric study
operations will be needed. For example, sail and
result. The first draft will be drawn after both
rig design or position and efficiency of extra
table and parametric study has identified, in
hardware. (Larsson & Eliasson, 2007)
either graph paper or Computer Aided Design
Using ‘The design Spiral’ to Design a
(CAD). Centre of Gravity and Centre of
product is impossible to operate without a target
buoyancy are required for further calculations.
or targets. Targets are mainly from parametric
(Larsson & Eliasson, 2007)
study and calculations after the information
Stability which is the intensity of Pitching,
collected from customers. (Larsson & Eliasson,
Yawing and Rolling and they are important to
2007)
find. They needed to be calculated after any