Balsa wood through or under?

  1. balsa wood through or under???

    hi,

    i have to design and build a balsa wood bridge for a class at university,

    i've been reading up and it seems for this type of material its best to use a truss bridge as its only good in tension or compression

    the load will be at the bottom i think

    wondering whether a through truss would be better than an under truss and why? cant find any info on why an under truss isnt used much apart from clearance/space issues.

    also which is better for a load directly applied in the centre, the pratt or the howe? im not certain

    any advice would be greatly appreciated

    thanks

    andy
     
  2. jcsd
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