6°/ VARIOUS FANS

There are several types of fans

The open fan :

It is cut in the medium by a traveller with 1 pin inside and 2 pins outside.

The closed fan :

There is, this time, 2 pins inside and 1 pin outside.

For the technical drawing, to see exercise of application.

The webbed fan :

One places 1 inside pin and 2 pins outside (as for the open range), but with each pin, one adds 1 pair.