1.5 Litre Stock
 
1.5 Litre Modified
Min. Length: 14 ft.
Class Letter: T or Y
Engine: 900 to 1600 cc with various modifications, methanol or racing gasoline.

Popular, small and economical, 1.5 Litre Stock hydroplanes can hit 95 mph. They are powered by 4-cylinder 1200-1500cc Toyota engines and use ordinary pump gas. 
  Min. Length: 14 ft.
Class Letter: T or Y
Engine: 900 to 1600 cc with various modifications, methanol or racing gasoline.

Anything goes on these highly modified 4-cylinder speed demons. Powered by pump gas or methanol to a top speed of 105 mph. 
2.5 Litre Stock
 
2.5 Litre Modified
Min. Length: 14 ft.
Class Letter: S
Engine: Stock 2000 or 2300 cc For 4 cylinder.

The affordable 2.5 Litre Stock class hydro can exceed 100 mph. Powered by 4-cylinder Ford engines (2000cc or 2.3 litre) on pump gas, the 2.5 Litre affords ver exciting side-by-side racing at a reasonable cost. 
  Min. Length: 16 ft.
Class Letter: A
Engine: Fully modified 2.5 Litre displacement. 
Engines are used: Ford, Alfa Romeo, BMW, Datsun, Fiero, Fontana and others.

The 2.5 Litre Modified racer can hit speeds over 125 mph - creatively. A few restrictions apply (for exampleengines must not exceed 166cl). However, these hydros can use pump gas, methanol or aviation fuel, and engine alterations are limited only by the racer's imagination.
 5 Litre
 
National Modified
Min. Length: 16 ft.
Class Letter: E
Engine: 305 cu. in. stock Chevrolet or Ford V-8 2 BBI, carb, pump gas.

Ford, Plymouth and Chevrolet stock V-8 engines power the 5 Litre Stock hydroplanes to speeds of 115 mph. Offering racing excitement on a budget.
  Min. Length: 19 ft.
Class Letter: NM
Engine: Up to 368 cu. in. allowed various modificatons methanol or racing gas.

The National Modified hydro offers speeds of 140 mph to the serious competitor. Many engine combinations are possible - from 4 cylinder to 350 ci V-8s.
Grand National
 
Grand Prix
Min. Length: 20 ft.
Class Letter: GNH
Engine: V-8 various modifications up to 468 cu. in. racing ga
s.

The Grand Nationals are one of the biggest, fastest Inboard classes. Their incredible speed (150 mph) and 70-foot roostertails make GNH races thrilling for drivers and fans alike. These 20+ foot boats are powered by big block Ford, Chevrolet, Pontiac or Oldsmobile engines.
  Min. Length: 24 ft.
Class Letter: GP
Engine: Big Block Chevy or Chrysler Hemi

At 170 mph, the Grand Prix Hydroplanes are the fasest automotive powered class in the world. Blown 510 ci, fire breathing engines power the low-profile sleek hulls around the race course for an unforgettable show.

 

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