It happens very often that we want to design a cantilever beam, while all project
requirements are not fully known. Namely, we know roughly what the structure should
realize. In classical optimization standard procedure should be applied in order to satisfy all
the pre-requirements. What happens if the requirements can only be described, but not
explicitly set? This paper starts from the premise that some requirements are expressed
linguistically. We want that the length and the largest deflection of a cantilever beam are
suitable to satisfy the predetermined conditions. Also, the goals are that the bending stress
and the largest deflection have to be less than the allowable maximum value. The objective
of this paper is: on known constraints and known fuzzy goal functions we must execute
fuzzy projecting of a beam. Constraints are: the length of cantilever beam and its deflection,
while the goal functions are maximum bending stress and maximum deflection. On this
basis, with known cross-sectional dimensions, we can determine the maximum cantilever
beam load
