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

Year	Driver/Owner	Races	Points
2020	ANDY DENKA	1	200
2019	ANDY DENKA	6	1005
2018	ANDY DENKA	9	1186
2017	CAL PHIPPS	2	350
2016	GEORGE L CONOVER SR	5	715
2015	ANDY DENKA	4	338
2014	STEVE KUHR SR.	9	1568
2013	STEVE KUHR SR.	8	865
2012	JIM MARTIN	11	1188
2011	JAMES DEEL	7	1490
2010	JAMES DEEL	10	625
2009	PATRICK SANKUER JR	5	325
2008	CAL PHIPPS	8	1330
2007	THOM HEINS	15	1210
2006	THOM HEINS	13	2030
2005	DONNA MACY	10	1143
2004	SCOTT LIDDYCOAT	14	1573
2003	CAL PHIPPS	8	995
2002	KENNETH W BRODIE II	6	960

Grand National Hydroplane National Champions

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

Grand National Hydroplane Records

Record	Site	Driver/Owner	Speed
5 mile / 3 laps WORLD	Sep 5, 1987 Essex, MD	Wheeler Baker Prime Mover Enterprises	117.058
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

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Date	Location
6/5/21	Springfield, OH
6/25/21	Richland, WA
9/26/21	Mason, WA