Inboard Hydroplane Racing
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
|
13’6” Min. Length |
750 lbs |
| 17’6” Max length | |||||||
| 9’6” Max Width | |||||||
|
T |
1.5 Liter Stock |
Toyota | 95 MPH |
14
|
12
|
13’6” Min. Length |
750 lbs |
|
Max Length 16’6” |
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|
Max Width 8’10” |
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|
S |
2.5 Liter Stock |
Ford | 100 MPH |
16 |
12 |
13’6” Min. Length |
975 lbs |
|
A |
2.5 Liter Modified |
BMW, Ford Chevy, Esslinger | 125 MPH |
16
|
10
|
16’ / 155.5 Engine |
1225 lbs |
|
16’ / 166.0 Engine |
1325 lbs |
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|
E |
5.0 Liter Stock |
Chevy | 115 MPH |
16 |
10 |
16’ Min. Length |
1450 lbs |
|
NM |
National Modified |
Chevy | 140 MPH |
16
|
8
|
17’ / 155 Engine |
1225 lbs |
|
17’ / 166 Engine |
1325 lbs |
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|
17’ / 246 Engine |
1350 lbs |
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|
19’ / 308 Engine |
1900 lbs |
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|
19’ / 368 Engine |
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|
18’ / Built prior to 10/30/87 |
1600 lbs |
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|
GNH |
Grand National Hydro |
Chevy | 150 MPH |
21 |
8 |
20’ Min. Length |
2000 lbs |
|
20’ / Built after 11/1/97 |
2200 lbs |
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|
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. |
