Download Backyard Ballistics: Build Potato Cannons, Paper Match by William Gurstelle PDF

By William Gurstelle

Usual parents can build thirteen remarkable ballistic units of their storage or basement workshops utilizing reasonably cheap family or ironmongery shop fabrics and this step by step consultant. transparent directions, diagrams, and pictures exhibit the best way to construct initiatives starting from the simple-a match-powered rocket-to the extra complex-a scale-model, table-top catapult-to the offbeat-a tennis ball cannon. With a robust emphasis on protection, the booklet additionally supplies tips about troubleshooting, explains the physics at the back of the initiatives, and profiles scientists and notable experimenters comparable to Alfred Nobel, Robert Goddard, and Isaac Newton. This e-book could be imperative for the legions of yard toy-rocket launchers and fireworks enthusiasts who want each day was once the fourth of July.

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16 Making and using the protractor Making the Protractor 1. Mark off angle lines on the cardboard from point A in 15-degree increments, starting from 0 degrees (level) and going to 90 degrees (pointing straight up). 2. Attach a string with a split-shot fishing weight at the bottom to point A. Then tape the tube to the cardboard as shown and you're ready to go. 3. When you launch the rocket, visually track the rocket through the paper tube and record the angle shown at apex. To summarize, in order to figure out how high our missile goes, we can follow three easy steps.

If the angle you measure is: Then the rocket's top altitude is: 10 degrees 18 feet 20 degrees 36 feet 30 degrees 58 feet 40 degrees 84 feet 45 degrees 100 feet 50 degrees 119 feet 60 degrees 173 feet 70 degrees 274 feet 100 feet 47 4 The Cincinnati Fire Kite 1946. A humid night on the Ohio-Kentucky border. A group of Fourth of July picnickers enjoys the warmth of the long summer evening. Suddenly, someone in the group points to the south. There, behind a grove of small pine trees, a floating circle of fire rises like a phosphorescent Portuguese man-of-war in a dark lagoon.

Take your time and use care as you mold the foil around the match and pins. The jet ports must be perfectly formed in order for the rocket to work. 5. Carefully remove the pins from the rocket assembly. The cylindrical areas left after removing the pins form the jet exhaust ports. 3 Wrap foil tightly around the pins and match. 4 Carefully remove pins, leaving jet ports open. Making the Launcher 1. Make a platform for the launcher. Attach the 1/4-inch copper tube to a hinge by using adhesive or brazing.

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