Broaching Risk in Following Seas

Broaching-to risk rises when wave celerity c exceeds 1.8·V_ship AND wave length is 1–3 × LBP.

Weather

LBPmShip speedknWave lengthm

Wave celerity: 16.76m/s

c / V_ship: 2.72 -

λ / L: 1.20 -

Broaching risk: Moderate or low risk

Changing the inputs requires JavaScript. The calculator above shows its default inputs and result. The formula, symbols, and regulatory sources are shown in the Formula section below.

Formula, assumptions, and limits

c = \sqrt{\tfrac{g \lambda}{2\pi}}

Symbol	Meaning	Unit
$c$	Deep-water wave celerity	m/s
$λ$	Wave length	m
$V$	Ship speed	m/s

Source: IMO MSC.1/Circ.1228

In short

Broaching-to risk rises when wave celerity c exceeds 1.

Learn the theory Seakeeping: Ship Performance in Waves