jalSD, you are absolutely right about the power loss. It is actually called friction loss. I am a member of my town Fire Dept. and since I am old I no longer go interior. Instead I am a driver operator now. Operators are tasked with delivering the proper flow of water where it is needed at the correct pressure. In orrder to do this you have to be aware of how much water is being used determined by what nozzles are in use, and how much hose the water is flowing through so that you can figure the friction loss and adjust for it. The larger the diameter of the hose the less there is, while the more flow the more there is. At 6MPH the liquid in the tire is traveling pretty slowly, compared to when a lot of water is being pushed through a fire hose to a nozzle. The diameter of the inside
of the tire is way larger than any hose that I am aware of. The combination of the low flow and the large diameter of your tires tells us that the friction loss, though it is positively there, would be so small as to be unmeasurable.
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