As a noun, fletching refers collectively to the fins or vanes, each of which individually is known as a fletch. Traditionally, the fletching consists of three matched B-feathers attached near the back of the arrow or dart's shaft that are equally spaced C its circumference. Four fletchings have also been used historically. Today, modern plastics may be used instead. Fletches were traditionally attached with glue and silk thread, but with modern glues thread is no longer necessary unless the arrow is a reproduction of a medieval war arrow. The fletching is used to stabilize the arrow aerodynamically. Feather fletches impart a natural spin on an arrow due to the rough and smooth sides of a feather and the natural curve, determined by which wing the feather came from. Vanes need to be placed at a slight angle to create the same effect, but all are there to impart D to the projectile to ensure that the A does not tumble during flight.
FTF: bon scott