American Boat Racing Association
H1 Unlimited is an Unlimited Hydroplane racing league that is sanctioned by the American Power Boat Association (APBA), and Union Internationale Motonautique (UIM). Until 2009, the series was known as ABRA Unlimited Hydroplane, in turn renamed from APBA Unlimited Hydroplane in 2004. The H1 Unlimited season typically runs from June through November, consisting of six races.
A hydroplane (or hydro, or thunderboat) is a very specific type of motorboat used exclusively for racing. One of the unique characteristics about hydroplanes is that they only use the water they're on for propulsion and steering (not for flotation) - when going at full speed they are primarily held aloft by a principle of fluid dynamics known as "planing", with only a tiny fraction of their hull actually touching the water.
Read more about American Boat Racing Association: History, Today
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