| | Category | EN | P13 | Trebuchet Trajectories |
| | Abstract | The purpose of my experiment is to determine which variables produce the |
| | greatest range for a trebuchet. By building a trebuchet and altering the |
| | arm length from the fulcrum to the weight, the mass of the weight, and the |
| | angle of launch, I can measure changes in distance and predict what |
| | combination of these variables would result in the greatest range possible |
| | for my trebuchet. The procedure is as follows: load one marble into the |
| | sling and pull back the counterweight. Release the marble with fingers on |
| | the side so as not to disturb the path it follows. Record the distance the |
| | marble travels. Next change the arm length by moving the fulcrum to a hole |
| | 2 cm closer to the weight; repeat for six holes. Return the fulcrum to the |
| | original position. Stack books underneath the base to vary the angle. Place |
| | weight on the base to prevent rocking. After testing the change in angle |
| | remove the books and add a discrete mass to the weight, keeping it |
| | balanced. Record the results, then add the same discrete weight and |
| | balance. The data collected showed a steady increase with distance as |
| | arm length and angle of launch increased, yet distance decreased slightly |
| | as mass weight increased from second heaviest to heaviest. I can |
| | conclude that the greatest range is attainable with maximized arm length, a |
| | weight of 353 grams, greatest launch angle and allowing for the trebuchet |
| | to rock back and forth, utilizing its momentum. |
| | Bibliography | Jacob Finkleman, Trebuchet Enthusiast |
| | www.redstoneprojects.com/trebuchetstore/trebuchet_history.html |
| | www.algobeautytreb.com |
| | www.nfo.edu/trebuche.htm |
| | Secrets of Lost Empires Two, Medieval Siege- Nova Documentary |