Racing Rules

Castaways Boatworx Racing Rules

 Race classes

Generally, Castaways Boatworx follows the rules as published by NAMBA. All Racers must be NAMBA members for insurance purposes.

A member must sign up to race not later than 6pm on the Thursday prior to race day and a member must pay the day’s race fee prior to the beginning of a race day.

Castaways Boatworx runs 5 NAMBA classes and must meet NAMBA specifications for the following classes, with the exception of battery limitations and we also allow the use ACQUACRAFT 1800 KV & 2030 KV, PRO MARINE 3656 2030KV, TRIPLE SSS (SAME AS PRO MARINE), DYNAMITE 3650 2000KV, Leopard 3660 2050 Kv for use in P-Limited classes.  Castaways will allow up to 15,000 mah batteries max for all classes.

  • P-Limited Mono- 34” max
  • P-Limited Cat- 34” Max
  • P-class Mono and cats combined – 36” Max
  • Q-class  Mono and cats combined – 40” Max
  • Offshore Class- 40”Max

Castaways Boatworx has 5 classes specific to our membership. No Modifications are allowed in Spec classes.

  • Spec Hydro –2030kv motor Aquacraft or Dynamite  Equivalent or Leopard 3660, 2050kv. Miss K + Shovelnose Hydroplane, wood or fiberglass up to 30”, all hydros must have a replica engine similar to engine made by classic hydros or a replica engine cowling with exhaust pipes.  All hydros are required to have a model driver. Use of an ultra light hatch cover (made by Ken Ryker) is allowed as a replacement for the stock cover. Use of stock cover is also allowed. 4 s Only, Prop = Any prop up to X442 as max size and pitch

2)Outrigger – Max length 33″ Any Motor, any battery, any esc.

3) Unlimited – Any hull, any motor(s) any battery configuration.

4) UL 19 – This class is specifically for the ProBoat UL 19 boats.  The boats must be factory stock including motor, and esc, with 4S batteries.  Replacement parts will be factory only parts.  Any propeller desired may be added.  ALL other parts must remain factory stock.

5)  Qualifier – this class is for new racing participants to racing experience. P-limited boats only.  No points or ribbons are awarded.

6)The Maximum Number of boats in any one heat is six. If multiple heats are established for a class the race director may combine classes if the number of running boats is less than

7)  All boats must be of a color that easily seen by the participant, their pit crew and competitors, particularly if the boat turns upside down.

8) The Racer Director and/or any club officer will insure that each boat presented for a race must conform to the hull requires for the class (i.e. cat-mono-hydro-outrigger). Hulls not conforming to a particular class will not be allowed to run. Hulls not conforming can petition the board for a rule change.

A participant must use the same boat in all heats for a particular class.

All Participants must have enough batteries to run 2 complete races in the classes they signed up for when they arrive at the race course.


Race Conduct

Lane criteria – All participants must round the offshore buoy as they approach the start line at the beginning of the race. All subsequent laps will follow the normal course layout. The boat must remain straight in that lane without any swerving outside that lane. The boat must maintain forward motion enroute to the start line.

Any participant that cuts the course short by going inside of one or more buoys will have one lap added to their race for each infraction. The Drive must return to the course as soon as it’s safe.

  • For Castaways races, the NAMBA rule regarding buoy infractions (Section 17, part D, paragraph 3) shall be locally supplemented to allow the race director to waive the penalty cutting a buoy provided:

1. the action was obviously taken to avoid an imminent crash not of the driver’s making, and
2. the race director, or his assistant(s), witness the event, and   
3. the driver gained no competitive advantage by cutting the buoy, and 
4. the driver returns to the racing lanes as soon as possible, and
5. the driver immediately requests the penalty be waived     
The race director’s decision to grant, or deny, this relief should be made as quickly as possible so accurate lap counts are maintained during the race.  The race director’s ultimate decision is final. 

At the end of the completion of the race laps, the participant must steer his boat into the center of the race course and keep it there until the Race Director declares the race is finished.  Offshore class is the exception of this rule – participants in offshore must return to the dock as soon as they completed the required number of laps.

Pit crews assist the participant by launching the boat, coaching the participant and recovering the boat after the Race Director declares a race is finished. The pit member will keep track of laps completed by the participant by raising their fingers after the completion of a lap, informing the driver of any obstacles on the course and giving an audible of the number of laps. Pit crew must verify finishing order participants with the Race Director before leaving the race line.

If any two boats in a class have accumulated the same number of point at the conclusion of class racing the points will be split between the drivers.

The only race classes that will be run are the classes that have been signed up for on the Thursday preceding Race Day. Other classes may be run if time permits and approved by the Race Director, but will not be awarded points or ribbons.

The Race Director shall have the final say in all matters concerning any race.  There is to be no arguing shouting or demonstration of poor sportsmanship. Any conversation with the race director shall be in a normal speaking voice and tone.  NO EXCEPTIONS


Driver Conduct

  1. Driver safety will be defined as the necessary techniques for running a race so that all boats may compete fairly with maximum assurance of finishing safely and without damage. Mastery and application of these techniques, even though the driver is separated from the boat, are the very essence of competitive skill (as in real racing)and will go far in increasing the pleasure and challenge of model racing competition. Driving a model boat should require the same care, precaution, and consideration for safety as is necessary in driving a life size boat, where lack of these factors could result in physical injury as well as boat damage.


  1. The following techniques are illustrated and are either suggested or mandatory techniques in racing as noted:
  2. a) In using a lane of travel around the course, do not follow the wake of the boat ahead. If its engine quits, the boat following could ram due to lack of coasting of a boat without power. This is a suggested rule and not grounds for a driver infraction.
  3. b) Never go in a reverse direction on the course unless on obvious grounds of acute emergency or directed by a contest official. Reverse direction corrections are necessary and may be required for as much as 30-45 degrees from the path of the course. A left turn into the course of more than 45 degrees is grounds for an infraction and any left turn endangering another boat will automatically draw an infraction.
  4. c) Right-of-way is maintained by the driver closest to the course outline as in Section 17 – rule B.4. Passing is permitted anywhere on the course with this in mind.




  1. d) Launching or releasing a boat requires it to be released as much in the direction of the course as possible, unless otherwise directed by the contest officials.


  1. A boat operating in a lane of travel around the course has the right to maintain that lane of travel without undue interference. Any boat desiring to pass in order to choose an occupied lane of travel must establish a reasonable safe interval before gaining that right.


  1. In racing, the natural lane of choice is the lane nearest the course outline. This lanewill have the right-of-way over other lanes of travel.


  1. The above rights-of-way also apply in the turns.


  1. Good driving techniques and sportsmanship decree that a relatively straight course bedriven. Fishtailing, “s” turns, or other such tactics to prevent or hinder an overtaking boat are prohibited.


  1. Violations of right-of-way will draw a driver’s infraction.

      8.All Racers new to the Castaways racing program must demonstrate their skill by racing the beginner classes (i.e qualifier/ P-Limited) for at least 2 racing events. Such trial period may be extended at the discretion of Club Officers. Exceptions can be made for Namba Members who have competed in a Namba event within the last 6 months.




  1. Normally drivers enter into a race with all systems operable and with firm control of their boats. Infrequently, however, a driver after launching or during a heat will discover that he is having difficulties in steering due to a fault with radio, servo, linkage, or other gear. This could cause other boats to be destroyed, run ashore, and otherwise damaged. Such practices will not be allowed.


  1. It will be the driver’s responsibility upon experiencing any sign of inability to control his boat while on course to immediately notify the Race director and at the first opportunity bring the boat to shore while any vestige of control exists. His first action will be to attempt to steer the boat away from the active part of the course, or if possible, to another part of the water. The Race director will then warn other drivers and officials when possible.


  1. Should a boat show erratic, random, or other behavior indicating possible control problems, a contest official will warn the driver. Should the behavior continue, the boat will be ordered off the course and given points for a “Did Not Finish.”


  1. Should a driver, after showing marked signs of control inability, and after being warned and given opportunity to leave the course, not comply with the order to cease operation, he will be banned from participation in any further heats and be given zero points for the heat in question.


  1. A driver experiencing control problems will not be allowed to enter another heat unless he can demonstrate that the problem has been corrected.


  1. Should a driver re-enter a heat after establishing controllability and should he continue to show erratic operation, his aimless maneuvers will be termed inability todrive properly and he will be ordered from the course.


  1. Substitute Driver – any boat owner may substitute another driver to participate with their boat. All points accrue to the boat owner.




 Starts – Castaways will use the “Flying Clock Start”


The clock system may use an audio tape .


An audible sound or statement will start the Pit Time. Pit Time will be 5  minutes, and an audible sound will signal the start  of this time period.


Clock Time (Mill Time) will commence immediately at the one minute announcement and will last for 60 seconds. At 30 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.


 All boats will leave the launch area and will go to the left of the start line. Driver may choose to launch anytime during “mill time” up to 30 seconds prior to the start.


The start of the race will be at the end of Clock Time when the countdown reaches zero.


 All boats coming from the right turn around the offshore buoy  at the start of the race will adhere to the five second rule of not changing lanes. 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.



  • General Penalties
    1. A driver who accumulates three “driver infractions” or “buoy infractions” will be automatically ordered off the course and awarded a “Did Not Finish.”
    2. Driving Infractions – A driver’s fault or infraction will be called by the designated contest official should any driver operate a boat in violation of the general racing rules of NAMBA or in an unsafe manner as outlined above.


  • Driver infractions will be penalized as follows:
  1. i) Normally, an infraction will draw a penalty of one extra lap over those required to complete the heat.
  2. ii) Should the infraction be of a serious enough nature as to endanger others (boats, contestants, spectators) or a flagrant violation of these rules (in the opinion of a contest official) the offender may be ordered off the course and disqualified from that event. Disqualification carries no points above a “Did Not Finish.”

iii) All infractions must be called within one lap of their occurrence to have a penalty assessed against the driver.

  1. iv) If a driver hits a called dead boat, that driver will be disqualified for that heat and will receive zero points as long as the boat that has been struck is compliant with the visibility rule under race classes.


  1. v) If a driver finishes a race and then hits a dead boat. that driver will be disqualified from that heat and will lose the points which he has earned for that heat. The remaining drivers, if any, will not advance a position when they finish the heat. The points that the offending driver lost due to the disqualification will not be awarded to the next driver who finishes.


  1. Buoy Infractions – A one lap penalty will be assessed when a boat cuts inside a course marker or when the boat jumps over or makes an obvious hit on a buoy. No penalty will be assessed for a boat that touches a buoy on the outside causing no damage.
  • A one lap penalty occurs when one or more buoys are cut on a turn or when a straight-away marker is cut. Offending boats must yield right-of-way to others on the course when re-entering. Lap penalties will be assessed during at the time of occurrence Buoy infractions will be called by a duly named official and corner spotter and any decision made will be final.




  1. Boats will score and accumulate points in order of their finish positions according tothe following table:


1st Place – 400 points

2nd Place – 300 points

3rd Place – 225 points

4th Place – 169 points

5th Place – 127 points

6th Place – 96 points

Did Not Finish (DNF) – 25 points

Did Not Start (DNS) – 0 points


  1. Contestants will carry over points toward the season end champion as determined by their overall class finishing position in the classes they ran.


  1. Points will be awarded to the boat owner in order of finish.
  2. A boat that fails to complete the heat due to the actions of another boat, that results in the disqualification of the offending boat, will receive 4th place points (169 points).This rule will be in effect from the beginning of Pit time until the end of Course time (Race Time). This does not affect the place of finish or points awarded to other boats finishing the heat.