Newspaper or other material (Ballast) Foam Tray or other material (Fins) Cardstock Paper (Nose Cone) 1. There are many websites with water rocket plans (and launchers) part of the fun is to experiment and come up with your own designs. I hope to later come back and write up an instructable for a launcher. This instructable will NOT cover the launcher. Stiff fins are best-flexibility decreases effectiveness Recommendation: 4 fins, equidistance apartĨ Materials 2, 2-Liter Plastic Soda Bottles Water rockets use water and pressurized air to launch a soda bottle(s) 100s of feet into the air. However, this also increases drag, so there is an optimal size for fins so that the rocket has enough stability without having too much drag. Nose cone reduces dragħ Stability & the Fins Fins Fins add stabilityįins helps control direction Counteracts sideways motion of the rocket Air flows smoothly past them if the rocket is traveling along its axis If there is sideways motion, then the air striking the fins pushes the rocket back towards straight motion Placing fins at the tail end of a rocket (behind Centre of Gravity) moves the centre of pressure closer towards the tail end and increases stability. If the speed of a rocket is less than the speed of sound (1200 km/h in air at sea level), the best shape of a nose cone is a rounded curve. Key Point: Stability increases as the distance between the Centre of Mass and the Centre of Pressure increases Nose cone adds weight to the top of the rocket The Centre of Mass of an object is the point at which all of the mass of an object can be thought to be concentrated Center of Gravity (Centre of Mass) balance point, moves forward The first point that meets the air is the nose cone at the front end of the rocket. This means that more water molecules are packed into a given volume. Thrust - the forward force produced by the gases forced from a rocket Launch=thrust greater than weight (thrust will make the object accelerate upwards) For every action there is an equal and opposite reaction (Newton’s Third Law of Motion) Can you now think of why expelling water might be better than expelling just air? Water is heavier than air because it is DENSER. When the rocket is released, the pressurized air forces water out of the nozzle (pour spout) and the rocket launches into the air.Ĥ Water Rockets- Questions to Think Aboutĭo I have to use water? Why can’t I just use pressurized air? How can I modify the design of the rocket to increase the duration of the flight? How will wind affect the rocket after it is launched?ĥ Propulsion-Thrust Propulsion – a force that pushes or drives forward STS-103 -Hubble Space Telescope Repair Creative display Reflects the dedication and mission of the team Has a : Symbolic Picture Team’s name SECME Theme for Year STS Flight to International Space Station Apollo 11 - Land on the surface of the Moon STS = Space Transportation Systemģ What is a Water Rocket? A water rocket is a chamber (2-liter plastic soda bottle) partially filled with water.
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