EFFECT OF PROPELLER SIZE AND SHAPE ON THE PERFORMANCE OF OUTBOARD MOTOR

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EFFECT OF PROPELLER SIZE AND SHAPE ON THE PERFORMANCE OF OUTBOARD MOTOR

CHAPTER ONE

INTRODUCTION

BACKGROUND OF THE STUDY

The conventional internal combustion outboard engine shown in Fig.1 is still the main modern method of marine propulsion and has variety of approaches to be adopted from a direct-injection two-stroke to a four-stroke cycle, with outputs from 2 to 557 horsepower (hp), and weights from a few kilograms to half a metric ton. There are various types of outboard engines in the market which vary in size, weight, output and design. The outboard engine is widely used as a power source for boat or ships due to their high performance, lower cost, simple installation, reduced fire risk, lower weight, higher speed, superior maneuverability, less draft giving better shoal water capability, and easier launching and beaching [1]. Yamaha, Honda, and Suzuki from Japan; and Mercury and Evinrude from America are the leading manufacturers [2]. The outboard engine can be divided into six subsystems base on their functions: the mechanical drive system, the swivel bracket system, water intakes, the propulsion system and the exteriors, as shown in Fig.2. The mechanical drive system includes the engine and transmission shafts to yield the kinetic energy. A swivel bracket system is the supporting and turning base and unloads the thrust from the propeller

Eugene Gatete, Department of Mechanical Engineering, JKUAT (corresponding author to provide phone: +254 (0) 790249557; e-mail: eugene.gatete@students.jkuat.ac.ke).

Hiram M. Ndiritu, Department of Mechanical Engineering, JKUAT (e-mail: hndiritu@eng.jkuat.ac.ke).

Robert Kiplimo, Department of Marine and Maritime Operations, JKUAT (e-mail: kiprob@eng.jkuat.ac.ke ).

with its clamp fixed at the ships stern. The water intakes sea water enters at this point and flows through the engine for cooling purposes. The gear box and propeller make up the propulsion system. The exteriors are the covers, connections and decorative pieces. The design of the outboard propeller is the main topic in this review. Therefore, calculation and analysis of the open water propeller performance of propulsion system are needed.

STATEMENT OF THE PROBLEM

The propulsion system of a boat is an assembly of components to drive boats based on rotary motion. One of the most critical propulsion systems is the propeller, which produces the power needed to push water while the main engine is running, as shown in Fig. 3. Its configuration involves a mechanism to push water, with the resultant reaction propelling the boat forward. It plays a great role in the fuel efficiency, thrust, torque and overall efficiency improvement. Due to its role in the performance of the boat as shown in Fig. 4, it is necessary to predict the performance of the considered propeller.

OBJECTIVES OF THE STUDY

To understand the effect of propeller size and shape on the performance of outboard motor
To understand the relationship between propeller size and shape on the performance of outboard motor

RESEARCH QUESTIONS

What is the effect of propeller size and shape on the performance of outboard motor
What is the relationship between propeller size and shape on the performance of outboard motor

RESEARCH HYPOTHESIS

H0: There is norelationship between propeller size and shape on the performance of outboard motor

H1: There is arelationship between propeller size and shape on the performance of outboard motor

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