Expected value

Launching Process

Figure 4.1 : Looking for the suitable base to
launch the water rocket.



Figure 4.2 : Pouring water into the water rocket.



Figure 4.3 : Water rocket is ready to launch.



Figure 4.4 : Pumping air into the water rocket.



Figure 4.5 : Water rocket in the middle of air.

How to Build a Water Rocket

Figure 3.1: First, collect some unused soft drink bottles. From the bottle cap, cut 1/3 of the length of the bottle. This part act as nose cone of the water rocket and the objective is to create an aerodynamic to the rocket so that air resistance is reduced.



Figure 3.2: Using 3/8-inch drill bit, drill a hole at the center of the rubber cork. Hold the rubber cork steady with G-clamp. Make sure the angle of the drill bit is perpendicular to the surface of the rubber cork.Then, screw the tire valve from the smaller surface of the rubber cork.



Figure 3.3: Plug the rubber cork on the bottle's mouth.



Figure 3.4: Place the nose cone at the bottom of the bottle.



Figure 3.5: Now, you have a water rocket and is ready to be launched.

Trial Launching

Clip 1:Trial Launching 1

Clip 2: Trial Launching 2

Clip 3: Trial Launching- Closeup

Water Rocket Project Overview

OBJECTIVE
To study impulse of a system with variable mass.

DESCRIPTION
Water rocket is a type of model rocket using water as its reaction mass. The pressure vessel, the engine of the rocket, is usually a used plastic soft drink bottle. The water is forced out by a pressurized gas, typically compressed air; thus, producing thrust to carry the rocket upwards.

Figure 1 shows the diagrammatic illustration for the structure of water rocket.

APPARATUS
Materials used in this project include the following,

• Plastic soft drink bottle
• Rubber cork
• bicycle pump
• launching pad

PROCEDURE

1. Compressed air is pumped which creates air bubbles floating up through the water and then pressurized the air volume in the bottle.
2. The bottle is released from the pump.
3. The water is pushed out the nozzle by the compressed air.

Assumption

• No air resistance acting when the rocket is propelling.
• No energy lost within the system.
• The path of propulsion is vertically upward.
• The weight of the bottle and air is negligible.

Theory



Schedule

Figure 2: Gantt Chart of Project Progress.

Meeting

Figure 1: (from left) Keat Yuan, Jester Ling, Nicholas Chew (sitting), Elvin Tan (finger pointing), Hai Yew, Yong Khai, Tsong Han.

Meeting was called to discuss the progress of the Water Rocket Project.

Introduction

This blog is created under instruction of Mr. Chua. The blog will be used to present our project progress.

*Further development will be post shortly. Please be patient.