Catapult
TL A

Team 24 (Hybrid)

David Lakin      Troy Moon
Alexandra Cruz   David Khonsary
Initial
Design
    Trebuchet first


    Decided to take risk with

    ballista
Problem
s
    Dimensional

    requirements
     (33”W x 81”H x 158”L)

    Projectile size


    Friction

Materia
ls
    Wood (oak/pine)

    Manila rope

    Metal rods

    Bolts/Screws

    Wheels

Constructio
n

    Fac

    e
Constructio
n

    Shaf

    t
Constructio
    n
    Base/Brid

    ge
Finished
Product
    Preliminaries





                    “De o
                       adb lt”
Collapsibility

    Two joints/three

    parts
        Body, Bridge, Base
    
Final Design Overview
First Test Runs
Trial    Launch     Distance in   Time in Modifications
Number   Angle in   Feet (nearest Seconds
        ...
Preliminary/Final Results

           Distance   Accuracy   Assembly/Disassembly
                                         ...
Final
Limitations
    Ratio of Projectile Size to

    Arm Size/Face Size
    Shaft length dependent upon

    arm lengt...
Reference
   s
Alchin, Linda K. (2008a). Ballista. Retrieved March
  22,2009, from
  www.middle-ages.org.uk/ballista.htm

...
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Catapult Tla

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Catapult Tla

  1. 1. Catapult TL A Team 24 (Hybrid) David Lakin Troy Moon Alexandra Cruz David Khonsary
  2. 2. Initial Design Trebuchet first  Decided to take risk with  ballista
  3. 3. Problem s Dimensional  requirements  (33”W x 81”H x 158”L) Projectile size  Friction 
  4. 4. Materia ls Wood (oak/pine)  Manila rope  Metal rods  Bolts/Screws  Wheels 
  5. 5. Constructio n Fac  e
  6. 6. Constructio n Shaf  t
  7. 7. Constructio n Base/Brid  ge
  8. 8. Finished Product Preliminaries  “De o adb lt”
  9. 9. Collapsibility Two joints/three  parts Body, Bridge, Base 
  10. 10. Final Design Overview
  11. 11. First Test Runs Trial Launch Distance in Time in Modifications Number Angle in Feet (nearest Seconds Degrees foot) 1 45 0 0 Initial design 2 45 9 1.4 Modification of shaft area: Deletion of trolley, addition of “pouch” to carry basketball forward, “flattening” of arms, change in bow string position. 3 30 15 1.7 Lubrication 4 45 13 2.0 none 5 45 16 2.2 Retightening of ropes 6 50 15 2.0 Retightening of ropes
  12. 12. Preliminary/Final Results Distance Accuracy Assembly/Disassembly Time Saturday 10 ft N/A Assembly: 17 sec Disassembly: 20 sec Saturday 7 ft N/A Saturday 15 ft N/A Assembly: 15 sec Monday 16 ft 28 ft Disassembly: 19 sec
  13. 13. Final Limitations Ratio of Projectile Size to  Arm Size/Face Size Shaft length dependent upon  arm length Torsion rope strength  dependent upon face size
  14. 14. Reference s Alchin, Linda K. (2008a). Ballista. Retrieved March 22,2009, from www.middle-ages.org.uk/ballista.htm Alchin, Linda K. (2008b). Roman Siege Weapons. Retrieved March 22, 2009, from http://www.roman-colosseum.info/roman-weapons/ro Hoisington, J. (2005, March 21). Ballista Physics. Retrieved March 22, 2009, from http://ffden-2.phys.uaf.edu/212_spring2005.web.dir/ L., Danielle & M., Nirvana. (2004). Optimal Launch Angles. Retrieved April 3, 2009 from http://www.umbc.edu/upwardbound-mathscience/laun Smith, K. & Smith, P. (2008). Ballistae. Retrieved Feb 25, 2009 from http:// siegethedayinc.com/ballistae.aspx

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