Deflection for a center load on a beam with two fixed / welded supports. If supports are not fixed, deflection is 4 times greater. Deflection is directly proportional with the mass. L = length (mm), W = width (mm), H = height (mm), T = thickness (mm), M = mass (kg) D = deflection (mm), LM = linear mass (kg/m), TM = total mass for 14 meters length (kg) Downward mass = 100 (kg) Steel pipes: * L = 2000, W = 50, H = 50, T = 2, D = 1.4, LM = 3.0, TM = 42.5 * L = 2000, W = 50, H = 50, T = 3, D = 1.0, LM = 4.5, TM = 62.4 * L = 2000, W = 30, H = 50, T = 3, D = 1.4, LM = 3.5, TM = 49.1 * L = 2000, W = 50, H = 30, T = 3, D = 3.3, LM = 3.5, TM = 49.1 * L = 1000, W = 50, H = 30, T = 2, D = 0.6, LM = 2.4, TM = 33.6 * L = 2000, W = 40, H = 40, T = 3, D = 2.0, LM = 3.5, TM = 49.1 * L = 2000, W = 40, H = 40, T = 2, D = 2.8, LM = 2.4, TM = 33.6 * L = 2000, W = 80, H = 80, T = 2, D = 0.3, LM = 4.9, TM = 69.0 * L = 6000, W = 50, H = 50, T = 2, D = 37.1, LM = 3.0, TM = 42.5 Spruce beams: * L = 2000, W = 50, H = 50, D = 8.7, LM = 1.1, TM = 15.1 * L = 2000, W = 30, H = 50, D = 14.5, LM = 0.6, TM = 9.0 * L = 2000, W = 50, H = 30, D = 40.4, LM = 0.6, TM = 9.0 * L = 1000, W = 50, H = 30, D = 5.0, LM = 0.6, TM = 9.0 * L = 2000, W = 40, H = 40, D = 21.3, LM = 0.7, TM = 9.6 * L = 2000, W = 80, H = 80, D = 1.3, LM = 2.8, TM = 38.5 * L = 2000, W = 30, H = 90, D = 2.5, LM = 1.2, TM = 16.3 * L = 2000, W = 30, H = 120, D = 1.1, LM = 1.5, TM = 21.7 * L = 6000, W = 50, H = 50, D = 235.4, LM = 1.1, TM = 15.1