Efficiency score – garrett' bridges: resources , The balsa bridge’s mass 0.0081kg and the rising starr bridge’s mass was 11g. the balsa bridge’s maximum load mass was 13kg, and the rising starr bridge’s maximum load mass was 15kg. thus, 13(0.35)/(350*0.0081) ≤ balsa bridge relative efficiency score ≤ 13(0.45)/(350*0.0081). Best method building balsa-wood bridge, $\begingroup$ i've built a few balsa wood bridges for school projects and have only one piece of advice to add to josh's: use super glue. it's strong, and dries quickly so you will save a lot of time, possibly enough time to build a test bridge and then improve the design. $\endgroup$ – taylorr137 feb 27 '13 at 2:14. What bridge design holds weight? – garrett', I’m building a balsa bridge that needs to span 36″. it only needs to hold 25lbs centered. the criteria for winning is to hold 25lbs with the most efficiency. my initial thought was to make an arch super and sub structure that overlaps on the main chord, with warren or k webbing(can post a sketch if it helps)..
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