1. The problem statement, all variables and given/known data I'm first yar civil/struc student, we have to make a balsa wood beam with marks awarded for the mass/beam weight ratio. Anyway i'm curious as to the best way to go about this. I'm aiming for the highest moment of interia in the y direction but would also like to be able to calculate an approxominte load. i;m currently missing the youngs modulus and the yield strengh of balsa wood (ultimate strength would be nice to know to). i'm aware that these values vary but a range or an average would be nice. 2. Relevant equations Whilst i'm here ill also ask about the best design for the beam. dimensions have to be within, 100mm(h)*100mm(w)*540mm(l) . The actual beam is only 500mm long the exra 40 is for the supports. 3. The attempt at a solution so far i have an I beam thats got 50*5mm flanges and a web of 90*10. Please any help would be nice.