[Bob Steele]

if your intent is to lighten... then it makes no difference... if your intent is to make a structure with the minimum weight and a definable way of transfering energy (either from gravity or collision or something else..) then triangles are the way to go.

Both look good... but circles waste material when it comes to the transfer of energy (think straight lines...) Our design this year utilizes triangles to distribute the energy of a high speed collision through the entire robot... always putting our rivets in shear and not in tension along with putting our sheet aluminum in compression only.

R