Assuming the interior the hose is very smooth (new) and the hose is 50 ft long and coiled into a 3 ft dia coil the total loss (5 gpm @50 psi) would be 1.343 psi at the end. Hose fittings are not calculated as they are not known.
I'm going to suggest the pressure loss is directly related to the 50 ft. of hose and has nothing to do with the gentle curve of the hose.
Bill
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