Nozzle / Fire-Stream Reaction Force
Nozzle reaction force for a smooth-bore (1.57 d^2 NP) or fog (0.0505 Q sqrt(NP)) stream, with a staffing note vs. the ~60 / ~75 lb thresholds. Per IFSTA Pumping Apparatus Driver/Operator.
Formula and source
Smooth bore: NR = 1.57 * d^2 * NP. Fog: NR = 0.0505 * Q * sqrt(NP). NR in lb, d in inches, NP in psi, Q in gpm.
IFSTA Pumping Apparatus Driver/Operator nozzle-reaction formulas, by name.
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