1. Electric racing rules are intended as a supplement to the General Power Boat Rules of NAMBA. In the case of a conflict, the electric racing rules shall prevail.
2. A positive method of speed control must be used. On/Off micro or variable speed controls are allowed.
3. The maximum permissible battery size is Sub C or 1.2 volt battery of any chemistry.

1. The following motor and cell configurations will be considered official for electric racing in NAMBA:

M-2   A single .05 motor with brushes, any endbell, ferrite magnets. 1-4 cells are permitted

N-1   A stock class utilizing any ROAR approved motor as defined by current ROAR parameters. 1-6 cells are permitted.

N-2   Any single motor, any endbell, bearings, and magnets. 1-6 cells are permitted.

O    Any amount and/or size of motors, any endbell, bearings, and magnets. 7-8 cells are permitted.

P    Any amount and/or size of motors, any endbell, bearings, and magnets. 9-12 cells are permitted.

Q    Any amount and/or size of motors, any endbell, bearings, and magnets. 13-18 cells are permitted.

S    Any amount and/or size of motors, any endbell, bearings, and magnets. 19-24 cells are permitted.

T    Any amount and/or size of motors, any endbell, bearings, and magnets. 25-32 cells are permitted.

2. All of the above classes will be further divided into mono and hydro. For specifications on these hull types, see General Power Boat Rules of Competition, Section G. Other specialty classes may be added from time to time.

1. An oval course shall be defined as follows:

1. A minimum of three to a maximum of five buoys will be used to define the turns on both ends of the course. The turn radius will be 30 feet, measured to the outside of the buoys, and the straightaway will be 170 feet from the exit buoy at one end of the course to the entrance buoy at the other end of the course. One lap total distance will be 528.5 feet.
2. Total lap distance will be 4/10 of a mile for four laps and 1/2 mile for five laps.
3. The Contest Director shall determine the number of laps which will be run for each class at a district event. The number of laps to be run for each class must be specified on all entry information which is disseminated about the event. All classes which are run at the annual Electric Nationals will be run on a five lap course.
4. Separate NAMBA Electric Heat Racing records will be maintained for both the legal four lap course and the legal five lap course.

2. Straightline racing shall utilize the standard NAMBA 1/16 mile straightaway course.

1. Launches - Hand launching or dead-in-the-water launching will be at the driver’s discretion.
2. Starts - Two types of starts will be permissible for heat racing. The choice of start format is up to the individual district or contest director.

1. Flying Clock Start

1. The clock system used may be a visual clock or an audio tape type clock.
2. An audible sound or statement will start the Pit Time. Pit Time will be one minute, and a horn or audible sound will signal the end of this time period.
3. Clock Time (Mill Time) will commence immediately upon the expiration of Pit Time, and will last for 30 seconds. At 10 seconds, no more boats will be allowed to be launched. Any boat launched after this time will be ordered off the course and will receive a "Did Not Start" for that heat.
4. All boats shall leave the launch area and shall go to the left of the start buoy and to the right of the buoys in the left end of the course. All boats will then utilize a 3/4 mill during Pit Time and during Clock Time.
5. The start of the race will be at the end of Clock Time when the countdown reaches zero. All stop watches will be started at this point, and will be stopped when the driver finishes the required laps.
6. All boats coming from the right turn at the start of the race will adhere to the five second rule. All boats jumping the start will proceed around the complete course to the start line for a legal start. No boat may be stopped on the course for the purpose of waiting in order to better time the start. A disqualification will be given for this infraction.

2. LeMans Start

1. The official start of the heat will be a signal from the Contest Director.
2. All stop watches will be started at the signal, and will be stopped when the driver finishes the required laps.
3. All boats will race toward buoy one and two on the left end of the course, and will continue around the course to the start/finish line. This will constitute the completion of the first lap under power.

1. General Rules

1. Racing shall consist of four laps on the official NAMBA electric course.

2. Hull Specifications

1. Hull designs shall follow those for Sport Hydro with the following exceptions:

1. Hull length shall be a minimum of 20 inches and a maximum of 26 inches.
2. The drive train is entirely at the modeler’s discretion, including the location of the drive dog and strut, if used.

3. Motor Specifications

1. Power parameters for this class shall comply with the class "O" specifications.

1. General Rules

1. This class will comply with the existing rules for 1/16th Sport Scale Hydro with the following exception:

1. Section 1 of General Rules will be eliminated and either legal NAMBA electric course may be used.

2. Hull Specifications

1. This class will comply with the existing rules for 1/16th Sport Scale Hydro with the following exception:

1. Hull length shall be a minimum of 24 inches.

3. Motor Specifications

1. Power parameters for this class shall comply with the class "P" specifications.

1. General Rules

1. This class will comply with the existing rules for 1/16 th Sport Scale Hydro except as specified in the specific rules that follow.
2. This class is a combination class and "Q" and "S" will be run together.
3. Because "Q" and "S" will be running together, heat racing records will be shown as "Q & S" Sport Hydro.
4. Separate straightline records will be maintained for "Q" and "S" Sport Hydro.

2. Hull Specifications

1. This class will comply with the exiting hull specification for O Sport Scale Hydro with the following exception: The Q hull length shall be a minimum of 29 inches and the S hull length shall be a minimum of 35 inches.

3. Motor Specifications

1. Power parameters for this class will comply with class "Q" or "S" specifications.

4. Race Format

1. Heat racing format will be used utilizing the NAMBA Electric five lap course.

1. General Rules

1. This class will comply with the existing rules for 1/12th Sport Scale Hydro except as specified in the specific rules that follow.

2. Hull Specifications

1. This class will comply with the existing rules for 1/12 th Sport Scale Hydro

3. Motor Specifications

1. Power in this class will be limited to a single motor commonly referred to as a "Speed 700 class" motor. Specifications for these motors are as follows:

1. Can Length: 66 to 67 mm (2.598 to 2.638 inches).
2. Can Diameter: 42.2 mm (1.661 inches). This excludes option torque ring.
3. Fixed endbell
4. Fixed brushes
5. Ball bearings and bushings are legal
6. No modifications may be made to the motor. Except for normal wear, it must be run as shipped from the manufacturer.

2. Current motors known to conform to these specifications include Graupner 6306, Graupner 6316, Fine Design FD-EM 775, Robbe power 700 9.6, MPI ACC373 Promax 700, Hopf Viper 700 QC 9.6 Volt Neodym-Race 66mm, Hopf Viper 700 QC 12 Volt Neodym-Race 66mm, Hopf Viper 700 XLG 9.6 Volt 66mm
3. Current motors known to be illegal because the can is too short include Hopf Viper 700 QC 9.6 Volt RS-Neodym 60mm and Hopf Viper 700 QC 12 Volt Neodym 60mm.
4. Power will conform to class "P" specifications with that the limitation that cells must be of Sub-C (no cells larger or smaller will be permitted). Sub-C shall be defined as 23mm diameter and 43 to 44 mm long.

4. Race Format

1. The standard NAMBA electric oval course will be used. In the absence of a legal course, any oval format may be used. However, records may not be set on such a course.
2. Heats will consist of 10 laps.
3. Experienced racers are strongly urged to consider the skill level of the opponents when running in this class, since the intent is to encourage less skilled racers to have success.
4. The contest director is urged to strongly consider the experience level of the individual contestants when judging the race and to make calls accordingly.

1. Purpose - To duplicate in 1/10th scale the American Power Boat Association Crackerbox One Design Runabout.
2. Hull Specifications

1. Hulls must be within 1/8th inch of the appropriate hull.
2. The deck/hatch must resemble that of the full scale hull.
3. The boat must be pained in the spirit of a racing scale model. Each boat will have the driver’s NAMBA number preceded by the letter "P".
4. Two drivers of scale-like appearance must be used in the driver/rider compartment. The driver must have orange colored helmets and live jackets.
5. The dead rise of the transom shall be 3/8ths of an inch in total (3/16th of an inch per side), with a transom width of 6 3/8th inches.
6. Drive Train

1. A single motor shall be coupled directly to a straight drive shaft. A flex shaft may be used in a straight tube.
2. The propeller may not extend beyond the back edge of the transom.
3. Steering shall be by a rudder mounted under the hull or attached to the transom.

3. Motor Specifications

1. Power parameters for this class shall comply with class "N-1" specifications.

4. Race Format

1. Heat racing format will be used.
2. The Contest Director shall determine the scoring format, i.e. total points or a "winner take all" final heat format.

1. General Rules

1. Electric Outboard Racing Rules are intended as a supplement to the NAMBA General Powerboat Rules of Competition. In the case of conflict the Electric Outboard Racing Rules shall prevail. Electric Outboard Racing Rules are not intended as a supplement to the NAMBA Outboard Racing Rules and as such must not comply with any of the rules therein.

2. Hull Specifications

1. Hull must be an outboard motor tunnel hull type.

3. Motor Specifications

1. This class will use the P class designation for power.
2. All boats must have motor mounted outboard of the hull. No inboards will be allowed.

1. General Rules

1. Electric Offshore racing rules are intended as a supplement to the NAMBA General Powerboat Rules of Competition and to the NAMBA Offshore Competition Rules. In case of a conflict the Electric Offshore Racing Rules shall prevail.

2. Hull Specifications

1. Offshore hulls may resemble an authentic Offshore APBA / SBI / UIM hull from a distance of 10 feet or must be a Deep-Vee or Catamaran (tunnel) type hull.
2. Stepped hulls will be allowed on both types of hull.
3. Open cockpit boats will be required to have a minimum of two driver figures.

3. Engine Specifications

1. Power parameters for this class shall comply with the class N-2, P, and/or Q specifications.

4. Race Format

1. The length of each heat shall be in 2 minute increments (i.e. 2,4,6,etc).
2. A flying clock start or Le Mans type start may be used.
3. Offshore classes (ie, N-2 / P / Q) may be combined at the Contest Director's discretion.

5. Race Courses:

1. Record Courses

1. Must be a NAMBA 1/10 mile electric course.
2. Left turn entrance buoy is to be located 45 feet from each turn exit buoy.
3. Left turn exit buoy is to be located 45 feet from left turn entrance buoy.