I know that a test of a single rotor is not going to tell you much of anything, even if done properly. System design is the bigger factor here as even the most efficient single rotor can be made complete inefficient with poor design. So let me ask you this. What information do you hope to get from simply looking at amounts in the cans? Different nozzles will give you different amounts in the cans, and the difference will be solely due to the different output of the nozzle. This essentially tells you nothing about the uniformity of the rotor/nozzle across the pattern. Are you planning on actually measuring the volume of water in the catches, or just look at it or measure it with a ruler? Also if you think nozzle height above ground will not impact the results you are mistaken. Instead of being combative, why not just ask someone to help you design your little experiment so it will actually have some meaning? I am sure deuk would help if you ask him nicely.