The Aero Club

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The Aero Club
QUASAR
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WATER ROCKET
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Flight of Water Rocket
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INTRODUCTION

• A water rocket is a type of model rocket using
  water as its reaction mass.

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PRINCIPLE

• It is based on the NEWTONS THIRD LAW OF MOTION.

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WORKING

• Prior to launch, the body of the rocket is filled
  with water to some desired amount, typically
  about 40 of the volume.
• Air is pumped into the bottle rocket to
  pressurize the bottle and thrust is generated
  when the water is expelled from the rocket
  through the nozzle at the bottom.

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Ideal Rocket Equation
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Water rocket stability

• As the rocket accelerates away from the launch
  pad, the velocity increases and the aerodynamic
  forces on the rocket increase.
• The wind introduces an additional velocity
  component perpendicular to the flight path
• The addition of this component produces an
  effective flow direction
• Since the effective flow is inclined to the
  rocket axis, an aerodynamic lift force is
  generated by the rocket body and fins.

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• During the flight of a model rocket small gusts
  of wind, or thrust instabilities can cause the
  rocket to "wobble", or change its altitude in
  flight.
• Whenever the rocket is inclined to the flight
  path, a lift force is generated by the rocket
  body and fins

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• The aerodynamic drag remains fairly constant for
  small inclinations.
• Lift and drag both act through the center of
  pressure cp of the rocket

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• A restoring force exists for the model rocket
  because the center of pressure is below the
  center of gravity.
• If the center of pressure is above the center of
  gravity, the lift and drag forces maintain their
  directions but the direction of the torque
  generated by the forces is reversed. This is
  called a de-stabilizing force

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• THANKS
• GET YOURSELF REGISTERED FOR WATER ROCKET
  WORKSHOP
• NOW.
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