Compared to other materials and characteristic to itself, wood has a wide range of property values. Those large ranges can be between the species itself, or even a single tree where they can have a ten times smaller density, bending strenghts, stiffnes or hardness in certain parts. In this paper a flexural modulus of elasticity for the tree of red oak in the longitudinal direction is determined by three - point bending. The direction of the bending force was perpendicular to the fibers in all the tested samples, and the direction of force was varied in relation to the flow of gods. The flexural modulus of the red oak in the longitudinal direction depends very little on the position of the bending force relative to the course of the gods (0°, 45° and 90°). The mean value of the flexural modulus of elasticity is 17.48 GPa for 0°,15.62 GPa for 45°, 15.82 GPa for 90°. Values and dissipations of the bend modulus of elasticity behave according to the Weibull distribution law, which we also use to statistically analyze the results. Weibull diagrams show us that, the bigger the perimeter of a shape or the Weibull modulus, the more homogenic the structure. For the first group Weibull's modulus is 8,02, for the second group 12,56, and for the third group 8,50. By comparing the results of our experiment to the values in the literature we can observe that our experimental samples have a slightly larger elasticity modulus.