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Catapult Design Calculations


By: Deke
New: 05-05-2014 10:35 PM
Updated: 05-05-2014 10:35 PM
Total downloads: 417 times

A spreadsheet developed design and optimize a catapult with constant force springs and a snail cam.

These calculations were first developed to determine packaging a catapult onto an FRC platform. The intention was to use constant force springs with a snail cam. Outputs needed were range, trajectory (ignoring air resistance), force applied to the snail cam, and spring force required. We ended up using regular tension springs to save on budget for iterating constant force springs, but we with the issues we dealt with releasing the catapult, constant force springs may have solved a lot of problems we had with the large initial force on the catapult.

Using the calculations we determined a two position shooter would provide the most range. During competition, the "truss shot" or close range shot was rarely used. I think scouts may have thought that the shooter was inconsistent when we switched from long shot to short shot.

Attached Files

  • lsx Catapult Calcs.xlsx

    Catapult Calcs.xlsx

    downloaddownload file

    uploaded: 05-05-2014 10:35 PM
    filetype: lsx
    filesize: 18.2kb
    downloads: 415

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