From IFMAR rules:
SURFACE
Pack able rock free dirt - preferably sifted top soil/clay compound with minimum amounts of
sand. Surface should be able to be easily broken and repaired to ensure a consistent and
wide racing line. Such conditions have shown to yield excellent racing due to width and
consistency of the racing line. Additionally qualifying is fairer as the ability to maintain a
consistent surface gives all competitors an equal track that can be enjoyed by those in heats
before as well as after his own.
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