A recent study has shed light on the capabilities of ancient triremes, revealing that the minimum speed needed to break a single plank of an enemy ship with a ram is 1.3 to 3 knots. This finding highlights the technical sophistication and advanced understanding of naval engineering in antiquity.

Triremes, famous for their efficient design and speed, were the backbone of naval fleets in the ancient Mediterranean world. The ram, a structure made of a bronze casing over a wooden base, projected from the bow of the ship below the waterline.

Its main objective was to cause critical damage to the enemy ship’s hull, allowing significant water penetration and thus ensuring its destruction.

One of the rams used in the study
One of the rams used in the study. Credit: E. Itzhack et al.

The study, based on a “first principles” approach, combined engineering principles and energy balance concepts from physics. The researchers analyzed the construction details of the attacked ships and assessed their ability to withstand the impact of a ram of specific length.

The researchers concluded that the minimum speed to break a plank ranges from 1.3 to 3 knots (2.4 to 5.5 kilometers per hour). These values were derived from a variety of parameters obtained from archaeological data of shipwrecks.

The importance of this discovery lies in its experimental validation. The crew of the Olympias, a modern reconstruction of an Athenian trireme, demonstrated that the speeds necessary for an effective ram impact are within the capabilities of these ancient vessels.

One of the ships used in the study
One of the ships used in the study. Credit: E. Itzhack et al.

These practical tests not only corroborate theoretical estimates but also provide a tangible insight into how naval tactics were carried out in antiquity.

The Olympias has played a crucial role in this field, allowing researchers to test historical hypotheses about navigation and naval combat.

The tests conducted with this modern trireme have been fundamental to better understanding the dynamics of impact and the effectiveness of the bronze ram.


SOURCES

E. Itzhack, D. Cvikel, Y. Me–Bar, Damaging a trireme by ramming: The kinetics. Journal of Archaeological Science: Reports, Volume 57, September 2024, 104678. doi.org/10.1016/j.jasrep.2024.104678


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