for one of my drafting classes I have to design a beam. The beam needs to carry a concentrated load at the midpoint. some parameters: 4ft span total materials must weigh under 12oz Pin reactions at the ends the person last year that won(highest load) made a simple I joist out of Balsa. I'm wondering if anyone has any experience in this project. I am thinking of making a Vtype webtruss out of pine, I know mod. of Elasticity for pine is greater than balsa, but more dense which I may run into problems with the weight. Any suggestions?