University of San Diego
Department of Engineering
Balsa Bridge Competition:  Fall, 2005


Asst. Profs David Malicky and James Kohl





Rules and Software

Rules
Envelope (Autocad 2002 format)
Envelope (jpg format)
Beginning Guidelines
CME-Truss 2.1 Download
CME-Truss 2.1 Guide/Tips

Competition Results

  Team Cost Weight Load Load/Wt Score
    ($M) (lb) (lb) lb/lb  
Statics Section 1 A 0.23 357 1552 7.4
B 0.19 251 1321 6.2
  C 0.31 474 1529 7.0
  D 0.56 786 1404 6.5
  E 0.56 1648 2943 14.0
  F   0.25 815 3260 15.3
Statics Section 2 1 5.4 0.37 374 1017 22.8
2 6.0 0.40 722 1821 40.4
  3 4.8 0.28 905 3185 68.1
  4 6.5 0.46 1453 3126 71.1
  5 3.8 0.14 133 974 16.8
  6 5.6 0.25 588 2362 45.2
Strength of Materials 1   X X X  
2   X X X  



Competition Pictures
(Digital read out shows the total applied load in pounds.)  

Statics Section 1: Team A




357 lbs and only a little worse for wear

Statics Section 1: Team B




This one held 251 lbs and stayed together pretty well.  


Statics Section 1: Team C




After a healthy 474 lbs.


Statics Section 1: Team D




This one went to 786 lbs


Statics Section 1: Team E


This team couldn't wait for the next course (beam and column design).  


Well, not the way it was meant to be loaded, but that column sure is strong.  

Statics Section 1: Team F




Also not quite a truss, but 815 lbs is nothing to sneeze at.  


Statics Section 2: Team 1


Think of it like a moon rocket... Stage 1, which was shed after a hundred pounds or so...


And Stage 2, which went to 374 lbs.

Statics Section 2: Team 2




Sean cranks it down... to 722 lbs.  


Statics Section 2: Team 3




Stephen puts the load on... to 905 lbs.   Best strength-to-weight ratio of the truss bridges.  

Statics Section 2: Team 4


Looks like it might hold a bag of potatoes, no?  ;)  


Off to a good start


Rusty cranking it to a max load of 1453 lbs... highest load of the truss bridges and highest overall score (load, cost, and weight).

Statics Section 2: Team 5


A svelte design -- the lightest bridge of the competition.   

Statics Section 2: Team 6


(Team 6 was gracious enough to test the day before everyone else, though Heather and Katrina couldn't make it then -- Sorry no pic)


Paul puts the pressure on... to 588 lbs.  


Strength of Materials: Team 1


The laser-cut beam-column bridge.  


Pontifex Maximus ready for business


It keeps going...


And going...


To a max load of ______.  


Strength of Materials: Team 2


The constant-strength beam team


Ian warming it up.  


Nearing the max load


This one would have given the test fixture a work-out except for an early glue failure.   Still achieved a max load of  ______.  



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