Me and my friend (Joel Bettis) finished working on this camelback truss a few days ago.
I would have built a bowstring truss instead except, legos don’t bow.
Those of you who haven’t read Building Big By David Macualy ask “What is the difference between a camelback truss and a bowstring truss?” Well before I explain that you must understand a simple thing about building bridges; if you secure a board on both sides and put weight in the middle it will bend. This makes the top part a little bit smaller (so, it is under compression) and the bottom part a little bit bigger (which puts it under tension). And, if either of these forces are too great, for the bridge, it breaks. A bowstring truss however has a bottom that bows up so when weight goes across it, it straightens out but does not sag.