You need to mount a bracket on the transom for the outboard
to clamp onto. Google
The trick is to find one that will work with the angle of YOUR transom. The one you use will also depend upon the size of your boat. You may need one that swings up & down with the motor
on it so that you can keep the propeller
from dragging when you're under sail. You may need a fixed one, because the motor weighs too much to lift
. Depending upon the size of your boat and the weight of the motor, putting an outboard
back there can really mess up your boat's sailing qualities.