The Cuban Eight is a fairly standard aerobatic manouevre and is not particularly difficult. It does however require a lot of practice to get it spot on.
The idea is to do two circular manouevres, one upwind and one downwind of the pilot's stance. The central part of the manouevre is the crossover where the model rolls from inverted to upright. It requires considerable practice to get a good cross over, down the 45° lines and in the centre.
You can see immediately that the model must pass the centreline before the model is pulled up for the first circle.
A very common manouevre is the Half Cuban Eight and is usually used as a turn around end manouevre. Only one half of a Cuban Eight is carried out (Duh!) with themodel reversing it's direction from the entry position. If used as a turnaround, the whole manouevre is displaced to the left or right and is usually followed by some kind of centre manouevre - a loop for example.
If you can do something one way then you can usually reverse it! Much the same as a Cuban Eight, the Reverse Cuban Eight is no more difficult. This time however, you have to start the manouevre before you reach the centreline.
The Half Reverse Cuban Eight has a major advantage over the standard Half Cuban Eight for a turn around. You finish the manouevre much earlier - and so further away - with the wings level which gives you a good run in for any following manouevres. This is a highly recommended means of turning the model around.