I am having the hardest time calculating q, the load per unit length. This question is in relation to my previous question I posted here. I have a cylinder laying horizontally that is fixed on its ends. The cylinder is filled with water. To calculate the deflection I am simplifying the problem by combining the volume of the cylinder and the volume of the shaft. 1) Find the total volume of the cylinder with the end shafts. 2) Find the volume of the water inside the cylinder. 3) Find the mass of the value in 1) using the density of the cylinder material. 4) Find the mass of the value in 2) using the density of water. 5) Add the masses together. 6) Calculate the total mass and find the weight by multiplying by 9.81. 7) Take this weight (load) and divide by the entire length (from end of shaft to end of shaft). 8) Use the deflection equation for a cylinder fixed at both ends using I for a solid circle and E for the cylinder material. Essentially what I am doing is lumping all the masses into one mass which is represented by the shaft end to end measurement with a diameter of the shaft. Is this procedure good enough for a rough estimate for the deflection?