Guwahati: A researcher from Assam has taken a fresh look at one of the oldest weapons known to humans, the bow, and found that its performance may have had more to do with shape than the material used to make it.
Kishore Dutta of Handique Girls’ College studied three different bow designs, the self-bow, Scythian recurve and Japanese Yumi, using computer simulations. Instead of changing the materials, he kept them the same and changed only the geometry of the bows.
The results were strikingly different.
The self-bow produced a smoother and more predictable force, the Scythian recurve stored more energy over a shorter draw, while the Yumi showed a two-stage pattern of energy storage over a longer draw.
The study, published in the Journal of Archaeological Science, challenges the familiar idea that ancient bows evolved mainly through the use of better or more complex materials.
Dutta’s work suggests that different bow designs may instead have been different solutions to the same mechanical problem. A self-bow, therefore, need not be seen simply as an earlier or inferior version of a composite bow.
That finding could have implications for how archaeologists interpret ancient weapons, particularly when only fragments of a bow survive.
The study proposes using geometry as a starting point, examining what a particular curve, angle or shape could have achieved mechanically.
For Dutta, the next question is closer to home.
His study suggests that the same computer-based approach could be used to examine traditional bows of India, including bamboo composite bows from Northeast India. Researchers could compare their shapes on a common mechanical scale while keeping material properties constant.
That could bring a more quantitative approach to the study of traditional technologies, moving beyond simply recording that indigenous communities had sophisticated skills.
The same method, the study says, could eventually be applied to other traditional designs, including wooden ploughs, handlooms and bamboo bridges.
For Assam, the research provides an unusual link between modern computer simulation and technologies developed centuries ago, and raises a basic question about ancient engineering: was the secret in what the object was made of, or in how it was shaped?