Inboard Hydroplane Racing

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Hydroplane Classes

When you are looking at a hydroplane and wonder what class it is in, then look for the Class Letter from the table below:

Class Letter

Class

Common Engine Relative
Speed*

Minimum Driver Age

Maximum Per Heat

Minimum Length and Other Information

Minimum Weight With Driver

Y

1.0 Liter Modified Yamaha, Polaris 105 MPH

16

12

146 Min. Length

825 lbs

176 Max. length
96 Max. Width

T

1.5 Liter Stock

Toyota 95 MPH

14

12

146 Min. Length

825 lbs

176 Max. Length

96 Max. Width

S

2.5 Liter Stock

Ford 100 MPH

16

12

136 Min. Length

1025 lbs

176 Max. Length
96 Max. Width

A

2.5 Liter Modified

BMW, Ford Chevy,  Esslinger 125 MPH

16

10

176 Min. Length

1225 lbs (146 CID gas or 155 CID)
1325 lbs (146 CID or 166 CID)

96 Max. Width

E

5.0 Liter Stock

Chevy 115 MPH

16

10

16 Min. Length

1450 lbs

21 Max. Length
11 Max. Width

NM

National Modified
(6.0 Liter Modified)

Chevy 140 MPH

16

8

176 Min. Length (166 CID or less)

1225 lbs (146 CID gas or 155 CID)
1325 lbs (146 CID or 166 CID)

96 Max. Width (166 CID or less)
17 Min. Length (246 CID) 1350 lbs (246 CID)

19 Min. Length (308 CID or 368 CID)

1900 lbs (308 CID or 368 CID)

18 Min. Length (built prior to 10/30/87)

1600 lbs (built prior to 10/30/87)

GNH

Grand National Hydro
(7.0 Liter Stock)

Chevy 150 MPH

21

8

20 Min. Length

2200 lbs

2000 lbs (built prior to 11/1/97)
20 Min. Length (511 CID) 2500 lbs without driver (511 CID)
26' Max. length (511 CID)

GP

Grand Prix

Chevy 160 MPH

18

8

26 Min. Length

2700 lbs

* Relative Speed is only a loose approximation of actual speed to illustrate the differences between the classes.  The estimated speed is based on a short course (1 mile).  On a long race course (1 2/3 mile), actual speeds will be 10 to 20 MPH faster than those shown.

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