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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.

Grand National Hydroplane 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

Grand National Hydroplane High Point Winners

YearDriver/OwnerRacesPoints
2023GREGORY KREITZER8610
2021JOHN SHAW5700
2020ANDY DENKA1200
2019ANDY DENKA61005
2018ANDY DENKA91186
2017CAL PHIPPS2350
2016GEORGE L CONOVER SR5715
2015ANDY DENKA4338
2014STEVE KUHR SR.91568
2013STEVE KUHR SR.8865
2012JIM MARTIN111188
2011JAMES DEEL71490
2010JAMES DEEL10625
2009PATRICK SANKUER JR5325
2008CAL PHIPPS81330
2007THOM HEINS151210
2006THOM HEINS132030
2005DONNA MACY101143
2004SCOTT LIDDYCOAT141573
2003CAL PHIPPS8995
2002KENNETH W BRODIE II6960

Grand National Hydroplane National Champions

YearDriver/Owner
2021JOHN SHAW
2019ANDY DENKA
2018TONY STALDER
2016GEORGE L CONOVER SR
2015STEVE KUHR SR.
2014CAL PHIPPS
2011JAMES DEEL
2008CAL PHIPPS
2007RANDY WOLFE
2006THOM HEINS
2005RANDY WOLFE

Grand National Hydroplane Records

RecordSiteDriver/OwnerSpeed
5 mile/3 laps
WORLD		Sep 5, 1987
Essex, MD		Wheeler Baker
Prime Mover Enterprises
117.058
5 mile/4 laps
WORLD		Jul 20, 1996
Olympia, WA		Brian Reynolds
Brian Renolds
113.222
5 mile/5 laps
WORLD		Sep 8, 1996
Yelm, WA		Brian Reynolds
Brian Renolds
104.052
Kilo
APBA		Oct 19, 1991
Lincoln City, OR		Brad L. Mosier
Three Roses Inc.
155.718
1/4 mile
APBA		Sep 26, 2015
Duffy, OH		John Jenkins
Andy Denka
132.295