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The V-pattern in fire investigation is often misunderstood, leading to incorrect assumptions about fire dynamics. Contrary to popular belief, the speed of fire spread does not solely determine the sharpness of the V-pattern. Factors such as wall coverings and ventilation significantly influence burn patterns. A sharp V-pattern may indicate a hot, fast-burning fire, but a slower fire can yield a shallow V. Understanding these nuances is crucial for accurate assessment during arson investigations, particularly in locating the point of ignition along walls.
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V-Pattern Angle Myth Devon Anderson & Will Dempster
The Myth • The faster a fire burns, the slower it will spread horizontally and the closer the angles will be vertically. • On the other hand, the slower a fire burns the further the angle will tilt from vertical. “A fire which is hot and fast at the point of origin will leave a sharp V-pattern. A slow fire will produce a shallow V.” –The Army’s Field Manual
Why it’s a Myth • The nature of any wall covering and conditions of ventilation have important effects on the shape of the burn patterns. • The angle of the borders of the V-pattern do not indicate the speed of fire growth or rate of heat release of fuel alone.
How it Affects Arson Investigation • Origin of V can help locate the point of ignition -Normally along a wall (short circuit) • Concerning width of V – all factors need to be taken into account (ventilation, type of wall, etc.)
