Helical fletching makes the arrow lose more speed in flight than straight fletching

1 study

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There is a single measurement, a long way from modern target archery, and its cases point in two directions. An experimental archaeology test shot nine wooden arrows, with three natural feathers fitted straight, offset or helical in three lengths, from a 48-pound elm flatbow held in a mechanical device, and measured their speed with two chronographs one and six metres from the bow. With 2.5-inch feathers the straight-fletched arrow loses 3.83% of its speed over those five metres, the offset one 2.84% and the helical one 2.51%; with 5-inch feathers, 2.35, 2.33 and 1.66%, and the authors put this down to spin, which steadies the arrow sooner. With 4-inch feathers the reverse happens: the helical arrow loses 1.91%, the offset one 1.32% and the straight one 0.97%, and the authors themselves question whether feathers of that length are worth fitting off the axis. Two limitations weigh on all of it: there was a single arrow per type, measured over five metres, and the offset and helical arrows weighed up to three and a half grams less than the straight ones; with 5-inch feathers, where the weights are almost equal, the helical arrow still loses less. On plastic vanes and modern arrows there is no measurement at all.

Also phrased as: "helical vanes and speed"; "helical fletching"; "helical feathers"; "offset fletching and speed"; "helical fletching drag"

In practice

Archers hear that helical fletching steadies the arrow better but slows it down, and that anyone after speed should fit the vanes straight or nearly so.

Evidence

2020
Against Equipment tests Published later

Elm flatbow of 48 pounds at 29.5 inches in a mechanical device, nine wooden arrows with three natural feathers fitted straight, offset or helical at 2.5, 4 and 5 inches, chronographs at 1 and 6 m, 8 to 22 shots per chronograph. With 2.5-inch and 5-inch feathers the helical arrow loses less speed over 5 m: straight, offset and helical 3.83, 2.84 and 2.51%; 2.35, 2.33 and 1.66% (in energy 7.51, 5.59 and 4.95; 4.65, 4.60 and 3.29%). The offset and helical arrows weigh less, 32.74 and 33.1 g against 34.97 with 2.5-inch feathers, 34.43 and 34.4 g against 34.78 with 5-inch ones.

The important role of bow choice and arrow fletching in projectile experimentation. A ballistic approach · Christian Lepers, Veerle Rots
2020
For Equipment tests Published later

In the same test, with 4-inch feathers, the helical arrow loses more speed over 5 m: 1.91% against 1.32 for the offset and 0.97 for the straight one (in energy 3.78, 2.63 and 1.93%), and the authors question whether feathers of that length are worth fitting off the axis. Here the offset and helical arrows weigh 31.91 and 32.4 g against 35.36 for the straight one.

The important role of bow choice and arrow fletching in projectile experimentation. A ballistic approach · Christian Lepers, Veerle Rots

Status history

2020 Contested An experimental archaeology test shoots nine wooden arrows with natural feathers from a 48-pound flatbow held in a mechanical device, and measures speed with two chronographs five metres apart. With 2.5-inch feathers the loss is 3.83% straight, 2.84 offset and 2.51 helical, with 5-inch feathers 2.35, 2.33 and 1.66: here the helical arrows lose less. With 4-inch feathers it is the reverse, 1.91% helical against 0.97 straight. One arrow per type and different weights between arrows, and the cases in the same test point in two directions: contested.

Research lines

Cite

APA

Campagna, M. (2026). Helical fletching makes the arrow lose more speed in flight than straight fletching (Version 1). In Evidence Registry. Retrieved 16 October 2026, from https://matteocampagna.com/en/registry/equipment/helical-fletching-speed-loss

BibTeX

@misc{campagna2026_aletteelicoidaliperditavelocita,
  author = {Campagna, Matteo},
  title = {Helical fletching makes the arrow lose more speed in flight than straight fletching},
  year = {2026},
  howpublished = {Evidence Registry, matteocampagna.com},
  url = {https://matteocampagna.com/en/registry/equipment/helical-fletching-speed-loss},
  note = {Version 1; accessed 2026-10-16}
}

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