Diameters of products do matter as they directly influence the drag forces experienced. Larger diameters result in greater surface areas exposed to fluid flow, leading to higher drag forces based on the drag force formula. A simulation showed that reducing the diameter from 400mm to 260mm reduced the drag area by 35%, resulting in lower calculated drag forces over a range of water velocities. Smaller diameters thus experience less drag, requiring less material and making production and longevity easier.