Bow Slam Pressure - Ochi Formula

Design slam pressure on bow plating using Ochi-Motter empirical formula - basis for local scantling reinforcement forward of 0.15 L.

SlammingBowPressure

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This calculator requires JavaScript to compute its result. The formula, symbols, and regulatory sources are shown in the Formula section below.

Formula, assumptions, and limits

p_{slam} = \tfrac{1}{2} \rho V_r^2 \cdot \left(\frac{\pi}{2 \tan\beta}\right)^2

Symbol	Meaning	Unit
$V_r$	Relative vertical velocity at impact	m/s
$\beta$	Local deadrise angle	deg

Source: Ochi & Motter - SNAME 1973

Design slam pressure on bow plating using Ochi-Motter empirical formula - basis for local scantling reinforcement forward of 0.