You have a rigid vang. It is rigged with a wire
rope from the base of the mast, through a sheave
at the boom, and then to a rope purchase that is
a double becket block and lead down to the
mast base with another double block. The rope is
then lead to a single block at the mast partners and
then to a cleat aft of the mast.

What is the purchase ratio? [1 pt]

What is a simple way to determine any given
purchase ratio? [2 pts]

Since your mainsail area is large, you decided you
want to increase the final purchase, name a way to
do this? [1 pt]