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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 |
|---|---|---|---|
| 2023 | GREGORY KREITZER | 8 | 610 |
| 2021 | JOHN SHAW | 5 | 700 |
| 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 |
|---|---|
| 2021 | JOHN SHAW |
| 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 |
| 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 |
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Driving School Schedule
| Date | Location |
|---|---|
| 5/30/25 | Springfield, OH |
| 5/29/26 | Springfield, OH |