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Grand National Hydroplane

Grand National Hydroplane

Grand National Hydroplane, aka GNH or 7 Litre, is the largest non-supercharged Inboard hydroplane class. Powered usually by big block Chevrolet based engines (up to 511 cubic inches) with an hot rod racing engine(750+ horsepower), the highly competitive GNH's have 150 mph capability and throw 70-foot roostertails, thrilling drivers and fans alike.

Class Specifications

Minimum Length:20'
Minimum Weight:2220 lbs.
Engine:Big block automotive and marine based racing V-8 engines, up to 511 cubic inches
Fuel:Racing gasoline per APBA specs
Approximate Speed:150mph
National Champion:
High Point Winner: