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3, 2, 1, Blast Off!. Process. Read and understand the rules Research Design Build Test Analyze Fix. Important Rules. Build up to 2 rockets before the tournament Rockets will use 2 liter carbonated bottles MUST WEAR SAFETY GLASSES Nothing within 5 cm of the nozzle

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process
Process
  • Read and understand the rules
  • Research
  • Design
  • Build
  • Test
  • Analyze
  • Fix
important rules
Important Rules
  • Build up to 2 rockets before the tournament
  • Rockets will use 2 liter carbonated bottles
  • MUST WEAR SAFETY GLASSES
  • Nothing within 5 cm of the nozzle
  • Launched at 75 psi
  • Can use any recovery system
  • Best single rocket time will win
what makes it work
What makes it work?
  • Water is poured into the pressure chamber
  • Air is then pumped into the bottle.
  • When the rocket is released, the air forces the water out of the bottle.
  • Newton’s Third Law of Motion kicks in
pressure chamber
Pressure Chamber
  • 2 Liter soda bottle
  • Do not cut or scratch the pressure chamber.
  • Can glue fins to pressure chamber with silicone or polyurethane glues.
  • If pressure chamber is damaged it will not be launched
slide7
Fins
  • Fins keep the rocket stable in flight
  • There must be at least 3
  • Fins must be rigid
  • Backswept fins work best
what does it mean to be stable
What does it mean to be stable?
  • Stability: the tendency of the rocket to return to equilibrium
  • This means if the rocket begins to veer, it will straighten back up on its own.
  • To be stable, the center of mass must be closer to the top of the rocket than the center of pressure
nose cones
Nose Cones
  • Popular types:
    • Conical
    • Blunted Conical
    • Elliptical
    • Spherical
  • Nose cones reduce drag
  • Conical are easy to make but can be difficult to get straight.
recovery systems
Recovery Systems
  • A recovery system is something that slows the rockets descent.
  • The two most popular at the parachute and the back-slider
recovery systems12
Recovery Systems
  • The velocity of a falling object can be shown as follows

where v(t) is velocity, g is acceleration do to gravity, c is the coefficient of air resistance, t is time, and v(0) is initial velocity.

  • C is much larger for a parachute than a backslider; therefore, it will fall much more slowly
parachute
Parachute
  • Parachutes work best but are harder to get to work consistently
  • The size needs to match the rocket.
  • It should have 8 to 10 strings
  • Fold it like an accordion and then wrap extra string around it to keep it folded
backslider
Backslider
  • Backslider is made by making the center of gravity close to the center of pressure
  • This prevents the rocket from turning over at apogee and instead floating down on its side.
  • Fins on this type of rocket should be larger to help slow it down.
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