FINNSCREW SDN.BHD

PRESENTER:MOHD SYAHMI NURUDDIN

56267108111

ROZAIDI CHE RAZIB56267108112

- Propeller Making -

Advance Ship Resistance & Propulsion – LNB 21103

INTRODUCTION

• Finnscrew Sdn.Bhd is a company that produce propeller for boat and ship used.

• Head office base at Finland.• One of their factory for propeller

making was located at Ipoh,Perak.• They produce all type of propeller

with different size and materials.

PROPELLER MAKING PROCESS

PROCESS FLOW• 9 step which are:

– Pattern making– Molding– Casting– Fatling– Machining– Grinding– Balancing– Surface finishing– Packaging and shipping

• Pattern making is a process where from the design, the make a propeller blade template.

• The blade section is made from fiber glass and Putty.

PATTERN MAKING

• Molding is a process to make a mould to get propeller shape.

• It have 2 section which are upper section and lower section.

• The mould was made from fine sand and hardener agent.

MOLDING

• Casting is a process where a melting of propeller material such as Manganese Bronze will be put into mould to form a shape of propeller.

CASTING

FATLING

• Fatling is a process where the product of propeller will be removing from the mould.

MACHINING

• Process to remove the abundant part and drill the boss to make a hole on Hub/Boss.

GRINDING

• To ensure that the blade angle is correct and follow the design.

• They use a template to check the angle.

• At finnscrew sdn.bhd, they use static balancing method.

• The propeller will attach to a steel rod. Then,it will put on a roller table.

• If there have unbalance weight of blade, the more weight part will goes down.

• Worker will grind that part to reduce the weight to get balance with other blade

BALANCING

SURFACE FINISHING

• After balancing process had done, the propeller will going into grinding section again for surface finishing.

• They use sand paper grinding disc to smooth the surface.

PACKAGING & SHIPPING

• After surface finishing, the propeller is ready for packaging. They put it into wood box and cover it with plastic.

• Then, it is ready for export to Europe by shipping.

QUALITY ASSURANCE

• Quality is important thing for each propeller to ensure that the propeller is following the rule of IMO. The material must be following the standard of Shipping Classification Society to make it safe, reliable and durable.

QUALITY ASSURANCE

• To ensure all of this happen, the company was use a special equipment to check the material content. A piece of product will be use for analysis.

• Computer will analyze the content before display it onto monitor screen.

• Engineer will read the data and compared it with the manual spec for propeller that which type they built.

BALANCING METHOD

• There are two methods of propeller balancing – Static balancing– Dynamic balancing

BALANCING METHOD

• Static unbalance is gravity at work.• If a propeller is placed between

centers on frictionless rollers the heavy or weighted portion will rotate to the bottom immediately.

• This is corrected by adding or removing weight from the propeller.

STATIC BALANCING

• Dynamic balancing of a propeller isdone to provide for the lowest levelof vibration in its operating range.

• Professional Dynamic Balancinguse sensors to provide data to adigital processor during brief engineruns at 2000-2400rpm.

DYNAMIC BALANCING

• Corrective weights measured to the1/10th gram are temporarily placedunder spinner screws or starter ringgear which is measured to ± onedegree.

CAVITATION & CAVITATION NUMBER

• Cavitation is defined as the phenomenon of formation of vapor bubbles of a flowing liquid in a region where the pressure of the liquid falls below its vapor pressure.

CAVITATION

• Cavitation calculates by using Euler Number.

• The Euler number is a dimensionless number used in fluid flow calculations. It expresses the relationship between a local pressure drop e.g. over a restriction and the kinetic energy per volume, and is used to characterize losses in the flow.

CAVITATION NUMBER

• It is defined as:

• Somewhat the same structure, but with a different meaning is the Cavitation number.

• The Cavitation number is a dimensionless number used in flow calculations. It expresses the relationship between the difference of a local absolute pressure from the vapor pressure and the kinetic energy per volume, and is used to characterize the potential of the flow to cavitate.

• It is defined as:

PODDED PROPULSION

• Podded propulsion is a marine propulsion units consisting of electrically driven propellers mounted on a steerable pod. It is also known as azipod (Azimuth Podded Propulsion System).

PODDED PROPULSION

PODDED PROPULSION

• The pod's propeller usually faces forward, as in this puller (or tractor) configuration, the propeller is more efficient.

PODDED PROPULSION

• In addition, because it can rotate around its mount axis, the pod can apply its thrust force in any direction.

PODDED PROPULSION

• Azimuth thrusters allow ships to be more maneuverable and enable them to travel backward nearly as easily as they can travel forward.

PODDED PROPULSION

• The Azipod concept is not practical for use on warships because of damage control difficulties; integrating propulsion with rudder makes both easier to damage or destroy.

PODDED PROPULSION

AZIPOD CONCEPT• In the traditional azimuth propulsion

system the (electric) motor is located inside the ship's hull and rotation is transferred to the propeller through a gearbox.

AZIPOD CONCEPT• In the Azipod system the electric

motor is installed inside the pod. The propeller is connected directly to the motor shaft. No gearbox is required, thus providing greater efficiency.

AZIPOD CONCEPT

• Electric power for the Azipod motor is conducted through slip rings that allow the Azipod to turn through 360 degrees.

AZIPOD CONCEPT

• Because fixed pitch propellers are used in Azipods, power for Azipod is always fed through a variable-frequency drive that allows speed control of the propulsion motor.

THE END