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power boat racing...

Inboard

Get Ready to Fly

When you hear the roar of automotive engines and catch a glimpse of giant roostertails, chances are pretty good that inboards are on the water. As the largest category in the APBA, Inboard racing classes include both runabouts and hydroplanes that are fast, fun and LOUD. Classes span from wild Jersey Speed Skiffs (70mph) to supercharged 1,500 horsepower Grand Prix Hydroplanes (170 MPH). The minimum age for racing in this exciting category ranges from 14 to 21.

Inboard racing requires an unmatched level of teamwork and professionalism, as well as a family atmosphere with life long bonds between owners, drivers and crew members; and that is exactly what powerboat racing is all about.

Classes

Inboard racing classes consist of both Runabout and Hydroplane classes. You can tell a boat’s class by the letter(s) next to the boat number. All inboard drivers are required to wear a racing helmet and lifejacket as well as other protective gear such as fire-resistant Nomex and cut resistant Kevlar. Drivers who race inboards with an enclosed cockpit (capsule) are required to pass APBA capsule training and certification every two years. Nobody plans to flip, but it does happen from time to time…and when it does happen, the training pays off.

Inboard Runabouts, or flatbottoms, come in both the open cockpit and capsule variety. Flatbottoms are known for their long lean shape, which allows the boat to slice through water as they move at speeds of 100+ MPH. Got a friend? Some runabouts run with two racers on board – a driver and a mechanic

Hydroplanes glide over the water on a cushion of air, with only the propeller and sponsons on each side touching the water while air rushes under the hull, giving the boat the “lift” it needs to skim across the water. These bad boys are fast, with some classes running at speeds in excess of 150mph - Inboard hydroplane classes range from 1 liters (T-Boats) to the 1500hp supercharged Big Block Chevrolet V8 Grand Prix (GP). All inboard hydros utilize a capsule safety cell as well as racing lap and shoulder belts. Controls are similar to those of an automobile – steering wheel, accelerator pedal, rear view mirrors – but no brakes!

WATCH OUT for roostertails! If an inboard hydro is in front of you, chances are you’re about to get blasted with a wall of water from the giant roostertail of the boat in front of you. Racing into a turn favors the leader, with those behind having to deal with roostertail fallout!

1 Litre
1.5 Litre Stock
2.5 Litre Modified
2.5 Litre Stock
5 Litre
Crackerbox
Grand National Hydroplane
Grand Prix Hydroplanes
Jersey Speed Skiff
K Racing Runabout
National Modified Hydroplane
Pro Stock
Sportsman Entry (SE)
Super Stock

1 Litre

1 Litre ("Y" class) hydroplanes are small, light and lightning quick, racing to speeds over 105 mph. While supercharging is not allowed, other modifications are encouraged. Engines are automotive or marine based, 2 or 4-cycle style.  Maximum limit of 2-cycle is 1160 cc and maximum limit of 4-cycle is 1315 cc.  The most common engines are from 2-cycle personal water crafts boats!

1L Inboard
Requirements
Minimum Age: 
16 years old
Minimum Length: 
13' 6"
Engine: 
Fall into 4 categories with varying modification limits. 1030 cc, 1160 cc, 1260 cc, and 1315 cc
Speed: 
105 MPH
Minimum Weight: 
750 or 825 lbs including driver depending on boat legnth
Fuel: 
Racing fuel per APBA specs
Statistics
Competition Record: 
98.549 MPH
Straightaway Record: 
111.633 MPH
Previous Season National Champion: 
Fast Eddie Too-Y63 Jim Sechler

1.5 Litre Stock

1.5 Litre Stock ("T" class) hydroplanes race at 90+ mph. These small, light and racy hydros are a great starting point for young drivers or for budget teams. They generate all the competitive excitement of the bigger classes, but their smaller size, virtually stock components, and dependable 4 cylinder Toyota engine add a degree of economy to following the boat racing trail. 

Inboard Hydroplane Racing
Requirements
Minimum Age: 
14 years old
Minimum Length: 
14' 6"
Engine: 
4 cylinder Toyota SOHC 1587cc (97 cubic inches)
Speed: 
90+ MPH
Minimum Weight: 
825 lbs. including driver
Fuel: 
Gasoline per APBA specs
Engine Block: 
97 cubic inches
Cylinder Heads: 
4 Cylinder
Statistics
Competition Record: 
80.819 MPH
Straightaway Record: 
94.774 MPH
Previous Season National Champion: 
Trophy Hunter-T5 Douglas W Hagatha

2.5 Litre Modified

The 2.5 Litre Modified (""A" class) hydroplane races at speeds over 130 mph - creatively. Few engine restrictions apply beyond prohibiting superchargers and setting a displacement limit of 166 cubic inches; engine modifications are limited only by the racer's imagination.

Inboard Hydroplane Racing
Requirements
Minimum Age: 
16 years old
Minimum Length: 
16'
Engine: 
Fully modified 2300 Ford, Essingler, Alfa Romeo, BMW, Datsun, Pontiac Fiero, Fontana, Sesco, Ecotec, and others
Speed: 
130 MPH
Minimum Weight: 
1225-1325 lbs. depending on engine type
Fuel: 
Methanol (alcohol) or Racing gasoline per APBA specs
Propulsion: 
Superchargers are not allowed in this class
Engine Block: 
Maximum displacement of 166 cubic inches
Statistics
Competition Record: 
104.633 MPH
Straightaway Record: 
137.279 MPH
Previous Season National Champion: 
In Cahoots Again A-33 Cameron/Aid

2.5 Litre Stock

2.5 Litre Stock hydroplanes ("S" class) race to 100-plus mph, using 145 horsepower marine-based 2000 and 2300 Ford engines. S-boats offer very exciting side-by-side racing at a reasonable cost. Driving skill is paramount here, and driver development is inevitable, making this class an excellent stepping stone to bigger, higher-powered classes.

2.5 LTR Stock Hydroplane
Requirements
Minimum Age: 
16 years old
Minimum Length: 
13' 6"
Engine: 
2000 and 2300 Ford Inline 4 Cylinder
Speed: 
100+ MPH
Minimum Weight: 
1025 lbs. including driver
Fuel: 
Gasoline per APBA specs
Cylinder Heads: 
4 Cylinder
Est. Horsepower: 
145
Statistics
Competition Record: 
90.639 MPH
Straightaway Record: 
110.535 MPH
Previous Season National Champion: 
Playin Again S-88 R Sam Horner

5 Litre

5 Litre hydroplanes ("E" boats) race to speeds of 115 mph, powered by mildly modified marine-based stock 305 Chevrolet and 302 Ford V-8 engines (285 horsepower). Engine modifications are limited, putting a premium on driver skill, with great competition at every event. These guys and gals duke it out, every time!

Hydroplane Racing
Requirements
Minimum Age: 
16 years old
Minimum Length: 
16'
Engine: 
305 Chevrolet or 302 Ford V-8
Speed: 
115 MPH
Minimum Weight: 
1525 lbs. including driver
Fuel: 
Gasoline per APBA specs
Est. Horsepower: 
285
Statistics
Competition Record: 
101.084 MPH
Straightaway Record: 
124.551 MPH
Previous Season National Champion: 
Peters & May Racing E55 Bernard/Weber

Crackerbox

Crackerbox ("P") is one of the oldest Inboard Runabout classes, distingushed by the 2-person team of driver and rider seated side by side at the rear of the hull. A powerful modified engine, mounted amidships, powers these sprinting flatbottom hulls in impressively competitive races. 

Flatbottom Boat Racing
Requirements
Minimum Age: 
16 years old
Minimum Length: 
15' 6"
Engine: 
Small block V-8 automotive based, hot rod innards, carburetion or fuel injection allowed
Minimum Weight: 
1250 lbs
Fuel: 
Methanol (alcohol) or racing gasoline per APBA specs
Statistics
Competition Record: 
88.279 MPH
Straightaway Record: 
107.293 MPH
Previous Season National Champion: 
Miss Suncoast-P9 Eddie Solis

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
Requirements
Minimum Age: 
18 years old
Minimum Length: 
20"
Engine: 
Big block automotive and marine based racing V-8 engines, up to 511 cubic inches
Speed: 
150 MPH
Minimum Weight: 
2200 lbs.
Fuel: 
Racing gasoline per APBA specs
Engine Block: 
Up to 511 cubic inches
Est. Horsepower: 
750+
Statistics
Competition Record: 
117.058 MPH
Straightaway Record: 
155.718 MPH
Previous Season National Champion: 
No National Champion

Grand Prix Hydroplanes

 

Grand Prix Hydroplane – supercharged competition! This professional level GP class provides all the noise and excitement you can handle. The 1500 horsepower blown V-8s, based on big block Chevrolet design, make the most noise and throw the biggest roostertails this side of anywhere! Limitations are few; beyond the 468-cubic inch engine displacement, it’s Hot Rod City and up to the ingenuity of the builder. Grand Prix hydros are the biggest and baddest of the bad!

 

Grand Prix Hydroplane
Requirements
Minimum Age: 
18 years old
Minimum Length: 
23'
Engine: 
Supercharged Big Block Chevrolet V-8, maximum displacement 468 cubic inches
Speed: 
170 MPH
Minimum Weight: 
2700 lbs. including driver
Fuel: 
Methanol (alcohol) or racing gasoline per APBA specs
Engine Block: 
Maximum displacement 468 cubic inches
Est. Horsepower: 
1500
Statistics
Competition Record: 
116.129 MPH
Straightaway Record: 
169.081 MPH
Previous Season National Champion: 
No National Champion

Jersey Speed Skiff

Jersey Speed Skiff is an exciting and dynamic class of Inboard Runabout. In competition, the boat must carry a crew of two (driver and riding mechanic) seated side by side, strapped inside a steel tubing roll cage. The 300-plus horsepower Skiffs are a wild ride; they spend a lot of time airborne, bouncing around, rolling sideways to seemingly impossible angles, at 80 MPH. The riding mechanic holds on tight, while the driver stays on course. 

 

Previous National Champions:
2008 James Buturla JS-712 "Flying High"
2009 Bill Darby JS-13 "Darby's Rapture"
2010 Bob Presley JS-9 "Kentucky Blue"
2011 Trevor Kirsh JS-100 "Summer Storm"
2012 Leonard Outlaw JS-3 "Making Memories"

Jersey Speed Skiff
Requirements
Minimum Age: 
16 years old
Minimum Length: 
16'
Engine: 
283 or 305 cubic inch Chevrolet V-8
Speed: 
80 MPH
Minimum Weight: 
1650 lbs.
Fuel: 
Pump Fuel or Gasoline per APBA specs
Engine Block: 
183 - 305 cubic inches
Est. Horsepower: 
300-325
Statistics
Competition Record: 
74.832 MPH
Straightaway Record: 
85.092 MPH
Previous Season National Champion: 
Summer Storm JS-100 Trevor Kirsh

K Racing Runabout

K Racing Runabouts (K-Boats) are a professional class of propeller-driven Inboard Racing Runabouts, using virtually unlimited engines and fuel. Basically, anything goes. Drivers must be 21 years old and qualified, as these boats are extremely fast (competition speeds over 100 MPH, and a Kilo record of 147.265 MPH). 

K Racing Runabout
Requirements
Minimum Age: 
21 years old
Minimum Length: 
17'
Engine: 
Supercharged, maximum 470 cubic inch
Speed: 
100+ MPH (Kilo record of 147.265 MPH)
Minimum Weight: 
2250 lbs. including driver
Fuel: 
Any
Hull: 
All KRR boats constructed after 2/2/2006 must have registered reinforced cockpits
Propulsion: 
Maximum supercharger: GMC 8-71 design series roots type blower
Statistics
Competition Record: 
114.068 MPH
Straightaway Record: 
147.265 MPH
Previous Season National Champion: 
Tribal Thunder K-150 Charlie Marquard

National Modified Hydroplane

The National Modified hydroplane (NM) offers speeds of 140 mph to the serious competitor, utilizing automotive and marine non-supercharged engines ranging from 4-cylinder and V-6 up to 368 cubic inch V-8 engines, carbureted and fuel injected. 

Inboard Hydroplane Powerboat Racing
Requirements
Minimum Age: 
16 years old
Minimum Length: 
17'-19' depending on engine type
Engine: 
4 cylinder, V-6 and up to 368 cubic in. V-8 configurations
Speed: 
140 MPH
Minimum Weight: 
1255-1900 lbs. depending on engine type including driver
Fuel: 
Methanol (alcohol) or racing gasoline per APBA specs
Statistics
Competition Record: 
115.510 MPH
Straightaway Record: 
153.794 MPH
Previous Season National Champion: 
Murjr's Lauterbach-NM200 Thompson III

Pro Stock

Pro Stock Runabouts (PS) are a professional class of propeller-driven Inboard Racing Runabouts. The high speeds (120+ MPH) make Pro Stock an exciting class to drive or to watch.  These flatbottom boats use non-supercharged, 500 cubic inch engines, mounted rear of amidships and driving forward through a V-drive; carburetion or fuel injection may be used. The same hull may be run in Super Stock, so you may see boats with SS/PS next to the number.

Pro Stock Flatbottom Racing
Requirements
Minimum Age: 
16 years old
Minimum Length: 
16'
Engine: 
V-8 automotive based, maximum displacement 500 cubic inches
Speed: 
120+ MPH
Minimum Weight: 
1950 lbs. including driver
Fuel: 
Methanol (alcohol) or racing gasoline per APBA specs
Hull: 
Flatbottom
Engine Block: 
500 cubic inches maximum
Statistics
Competition Record: 
111.173 MPH
Straightaway Record: 
137.586 MPH
Previous Season National Champion: 
Canary Pride Ps-70 Faulkner Inc.

Sportsman Entry (SE)

Sportsman Entry is a fun, affordable entry level runabout class with a maximum speed of 85 mph using only GM cast iron small block and cast iron heads derived from passenger or truck model vehicles,  and abiding by inboard Runabout and safety rules.

To learn more about this newly added Inboard class please contact:

Class Chairman: Paul Grichar - pgrichar3@aol.com

Vice Chair: Dave Weber - billsheliarc@gmail.com

Class rules are online in the Inboard Rule Book:

Sportsman Entry Class Racing
Requirements
Minimum Age: 
16 years old
Minimum Length: 
16' - Min Width: 72"
Minimum Weight: 
1850 Lbs. (including driver and safety equipment) including driver
Statistics
Previous Season National Champion: 
No National Champion

Super Stock

Super Stock (SS) is a powerful, fast (100+ MPH) Inboard runabout class. These exciting flatbottom hulled boats are powered by high-winding, 427 cubic inch big block Chevrolet engines, based on the venerable L88 design, which must be mounted rear of amidships and drive forward through a V-drive. Drivers often run both Super Stock and Pro Stock, so you may see boats with SS/PS next to the number. 

Inboard Boat Racing
Requirements
Minimum Age: 
16 years old
Minimum Length: 
16'
Engine: 
427 cubic inch big block Chevrolet engine
Speed: 
100+ MPH
Minimum Weight: 
1950 lbs including driver
Fuel: 
Racing gasoline per APBA specs
Hull: 
Flatbottom
Engine Block: 
427 cubic inches big block
Statistics
Competition Record: 
102.763 MPH
Straightaway Record: 
129.105 MPH
Previous Season National Champion: 
Wild Child-SS80 David Rankin