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Hydroplane Classes
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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” |
Max. Width 8’10” |
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 |
E |
5.0 Liter Stock |
Chevy |
115 MPH |
16 |
10 |
16’ Min. Length |
1450 lbs |
NM
|
National Modified
(6.0 Liter Modified) |
Chevy |
140 MPH |
16
|
8
|
17’ / 155 Engine |
1225 lbs |
17’ / 166 Engine |
1325 lbs |
17’ / 246 Engine |
1350 lbs |
19’ / 308 Engine |
1900 lbs |
19’ / 368 Engine |
18’ / Built prior to 10/30/87 |
1600 lbs |
GNH |
Grand National Hydro
(7.0 Liter Modified) |
Chevy |
150 MPH |
21 |
8 |
20’ Min. Length |
2000 lbs |
20’ / Built after 11/1/97 |
2200 lbs |
GP |
Grand Prix |
Chevy |
160 MPH |
18 |
8 |
26’ Min. Length |
2700 lbs |
UL |
Unlimited
Light |
Chevy |
160 MPH |
18 |
8 |
20’ / 468 Engine |
2000 lbs |
20' / 468 / 511 Engine |
2500 lbs |
20' / 468 Supercharged |
2700 lbs |
G |
North American Challenge Cup Series |
Chevy, Dodge |
170 MPH |
18 |
8 |
26’ Min. Length
28’ Max. Length |
3,600 lbs / 575 Engine
2,800 lbs / 468 Engine |
* 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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