Generally, the smaller the flight, the dart will fly faster and have a straighter trajectory to the board. Using a larger dart flight should arc your dart and slow it down. There is no one set answer for the size of flight a person should use, it is through trial and error that you may find the right flight shape for you.
The shape of a flight is varied to suit different throwing styles and preferences in general:
We own many shapes of flights, and also you could design the shape you would like.
Other special flights also available.