In archery, the term power stroke is used to describe the effective distance during which the string pushes the arrow and transfers energy to it. In other words, it is the useful travel that the string makes from the moment of release until the arrow leaves the bow. Although the concept is often used in technical texts in English, in Spanish it can be understood as the power travel or acceleration travel of the arrow.

The power stroke is not exactly the same as the archer’s draw length. Draw length is the distance the archer reaches when drawing the bow to their anchor position. The power stroke, on the other hand, refers to the section in which the arrow is being propelled by the string. For this reason, it depends both on draw length and on other elements of the bow setup, especially the brace height, also called fistmele distance or brace height.

Brace height is the distance between the string at rest and the deepest part of the grip. If this distance is greater, the string starts from a more forward position and, consequently, has less travel to push the arrow. If the brace height is lower, the string has a longer travel, although this does not always mean better performance. A brace height that is too low can generate more noise, vibration, instability, or grouping problems.

In general terms, a longer power stroke allows the bow to act on the arrow over a greater distance. This can translate into a higher arrow launch speed, provided that the bow is efficient and the arrow has an appropriate weight. However, it should not be interpreted as an absolute rule. The final speed of the arrow also depends on the actual bow poundage at the archer’s draw length, the design of the limbs, the string material, the arrow weight, the tiller, the release, and the overall efficiency of the setup.

In recurve bows, traditional bows, and longbows, the concept is useful for understanding why two archers using similar equipment can obtain different sensations and speeds. An archer with a longer draw length usually generates a longer power stroke and, in addition, usually holds more actual pounds on the fingers. This can produce a faster arrow, although it also requires solid technique to maintain consistency.

In compound bows, the power stroke is also important, but it is combined with other factors specific to the pulley system, such as let-off, cam design, and the force curve. In these bows, the power travel is closely related to the way the cams store and release energy.

In summary, the power stroke is a technical concept that helps explain how the bow accelerates the arrow. By itself, it is not enough to measure the quality of a bow, but it does allow a better understanding of the relationship between draw length, brace height, stored energy, speed, and shot stability.