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Water Rocketry Workshop

Water Rocketry Workshop. Welcome ! Fjodor Islamaj - South High CS Fredericka Solomon - Worcester East Middle Mr . Reidy - Abby Kelley Dr. Lynne Geitz - Worcester East Middle Glenn Tucker, Debbie Bastien , and Debralee Seles - Goddard School

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Water Rocketry Workshop

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  1. WaterRocketryWorkshop Welcome ! Fjodor Islamaj - South High CS Fredericka Solomon - Worcester East Middle Mr. Reidy- Abby Kelley Dr. Lynne Geitz- Worcester East Middle Glenn Tucker, DebbieBastien, and Debralee Seles - Goddard School Dr. Abigail Slayton – Westborough Schools Saturday May 10, 2008 WPI Physics Department physics@wpi.edu

  2. The teams! • 5 schools represented • 11 teams to-date • 49 team members in all • ~ Tell us about your teams ~ • Remember to send us signed parent’s permission slips! Worcester Polytechnic Institute

  3. A streamlinedevent… • One goal: • Land the rocket in Goddard’s Circle • Size of Circle? • Poster contest? • Five attempts per team • 30 meters to the circle • Up to 60 psi is now allowed Worcester Polytechnic Institute

  4. Design with Safety in Mind! • Safety goggles required in launch area • 60 psi maximum allowed pressure • Use light-weight materials • Use a soft nose cone • Use guide rod for predictable launch direction • Use fins for stability in flight (prevent tumble) • Inspect bottle after each launch • Beware and be aware of other teams near you  • Avoid low launch angle – slosh leads to dump!  Worcester Polytechnic Institute

  5. How does a water rocketwork?Just like a spring! Start with no compression Compressed air Compressed spring Stored Energy Release Both systems are examples of Newton’s 3rd Law of equal and opposite action. Worcester Polytechnic Institute

  6. Effect of air resistance during flightThe retarding force of air on rocket is proportional to velocity squared (double the velocity and quadruple to retarding force). Height • If earth had no atmosphere: • 45 deg launch for max range • parabolic trajectory • In earth’s atmosphere: • reduced height and range • best launch angle varies • asymmetric trajectory Range Worcester Polytechnic Institute

  7. Variablesaffecting range: • Launch angle • Air / Water ratio • Tank pressure • Size of exhaust nozzle • Size of fins • Shape of nose • Mass of rocket (empty) • Relative positions of C.O. Mass and C.O. Drag Worcester Polytechnic Institute

  8. A few tips… • Bring spare parts: • bottles • fins • stoppers • Bring tools: • duct tape • utility knife • pliers • Practice a lot! Worcester Polytechnic Institute

  9. Going forward… • Goddard’s Cup • Each year, a new science challenge • Goddard’s Circle • Join and help develop next year’s activities • Science Outreach IQPs • Presenters: Marketing science on location • Mentors: Team building over the full school year Worcester Polytechnic Institute

  10. Physics is hands-on, so let’s go build some rockets! Worcester Polytechnic Institute

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