F3A corresponds to the aerobatic category. In this category you have to do some aerobatics. These aerobatics are judged on the trajectory, as opposed to aerobatics with “real” airplanes which are judged on the altitude. These figures are very large in order to work on the trajectory, so their engines are very powerful in order to do these figures at a constant speed. Another consequence of this is the dimension of the airplane used, they are called 2+2 because they are 2 metres in length and with a 2-metre wingspan.
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