Rule Book


1. Name and objective
1.1 The name of the Association is the ‘Offshore Model Racing Association’ and the insignia of the Association shall be the motif on all officially published material and the association website. The motif shall not be reproduced with approval from the Committee.
1.2 The object for which the Association is formed is to promote and facilitate the affairs of the Association generally. To stimulate the design and construction of Offshore Model Power Boats within the class rules, and to encourage the running, racing and development of Offshore Model Power Boats.

2. Membership
2.1 All current members are to have a vote in the affairs of the Association at the Annual General Meeting, if present.
2.2 The Association on the recommendation of the committee may in the general meeting elect honorary members.
2.3 On applying to join and/or renew membership to the Association, all individuals undertake to comply with the rules as published. Any recognised refusal or neglect to comply with the rules, any attempt to subvert the rules, or any conduct which is deemed either unworthy or injurious to the aims, objectives, interests and/or well-being of the Association, its members and assets, will render the membership of the individual in question, liable to termination or refusal.
In this eventuality, the individual will be asked to voluntarily resign membership. If resignation of membership is refused or it is otherwise deemed necessary, the elected committee can, on behalf of the Association, terminate the membership in question forthwith. Members who volunteer to resign their membership when requested to do so, may re-apply for membership to the Association again in the following year, at the discretion of the incumbent Committee.
An individual who has had membership compulsorily terminated will be refused any re-application to the Association for a period no less than 3 years from the end of the year of expulsion. After this period, any re-application for membership will only be considered at the discretion of the incumbent Committee.
The Association reserves the right to refuse membership, without explanation, at all times.
2.4 There shall be a subscription fee payable on joining and annually on or before the 31st. December. The fees shall be proposed by the committee and voted on by those members at the Annual General Meeting. Any existing member who has not re-joined by the 31st January will have to pay their full membership fee plus the joining fee.
2.5 A junior member shall be one who is 17 or younger in the calendar year of membership. Likewise, a senior citizen shall be one who is 65 or over in that calendar year of membership.

3. Officers
3.1 The Officers of the Association shall consist of a Chairman, an Honorary Secretary and Honorary Treasurer who shall be elected at the Annual General Meeting. The retiring officers shall be eligible for re-election.
3.2 No candidate for election to any Office (other than retiring officers) shall be proposed unless the name of such candidate and his proposer shall have been sent to the Honorary Secretary two weeks before the Annual General Meeting.
3.3 A Child Protection officer shall be elected in compliance with current legal requirements. The CPO shall be CRB checked and will ensure that the requirements of the OMRA Child Protection Policy are met.

4. Executive Committee
4.1 The Executive Committee (the committee) shall consist of a minimum of three officers elected at the Annual General Meeting to hold office until the conclusion of the next Annual General Meeting.
4.2 The Officers of the committee will in no way be personally responsible for the deeds of the Association’s members or any financial actions taken against them. Members are responsible for their own conduct at all times.
4.3 Candidates for election of the committee shall be those members of the retiring committee who shall offer themselves for re-election and such other members of the Association whose nominations duly proposed and seconded by a member of the Association in writing shall have been sent to the Honorary Secretary 15 days before the Annual General Meeting.
4.4 If a casual vacancy occurs by death or resignation the Committee may co-opt a member to fill the vacancy.
4.5 If the number of candidates duly proposed and seconded exceeds the number of vacancies to be filled the election shall be by ballot.
4.6 The committee shall manage the affairs of the Association according to the rules and shall apply the funds of the Association to the objectives of the Association.
4.7 It shall be the responsibility of the Honorary Treasurer to keep a complete and accurate account of the Association’s finances.
4.8 Membership fees for the committee shall be waived in the year of office.
4.9 The committee may co-opt additional members onto the committee as required to meet any future issues that may occur during the office of the said committee.

5. Honorary Auditor
5.1 A member (other than an officer or committee member) shall be appointed by the committee as Honorary Auditor whose duties shall be to audit the accounts of the Association. In the event that he/she is unwilling or unable to act, the committee shall appoint a substitute.

6. General meetings
6.1 The Annual General Meeting shall be held at some place on some day in the month of October/November to be “confirmed” by the Chairman. The Honorary Secretary shall, at least 30 days before the date of such a meeting, post, deliver electronically or otherwise communicate to each member, notice thereof and of the business to be brought forward thereat.
6.2 The committee may, on giving 30 days notice, call a general meeting of the Association for any specific business, the nature of which shall be stated in the summons convening the Meeting, wherever possible.
6.3 The committee shall also call a general meeting on the individual written request of twelve and a half percent of the members, wherein the members in question must give good cause for convening such a meeting.
6.4 At a general meeting of the Association each current member present (other than an honorary member) shall have one vote; honorary members shall be entitled to attend the general meeting but shall have no vote. In the case of an equality of votes the Chairman shall have a second or casting vote.

7. New rules, Amendments and Alterations
7.1 Notice of any alterations or additions to the rules intended to be proposed by a member of the Association shall be given to the Secretary in writing 7 days before the Annual General Meeting or at least 15 days before any special meeting at which the same is to be brought forward and full particulars of any such proposed alterations or additions shall be set out in the notice given to the committee.
7.2 All such proposed alterations, additions and any amendments to them which may be proposed, seconded and presented at the meeting, shall be put to the vote of the meeting. Voting will be conducted on a show of hands (or ballot if requested) and decided by a straight majority of those present. (I.e. no postal or proxy votes)

8. Dissolution
8.1 Any assets will be divided amongst the current members.
8.2 Any deficiencies will be borne equally by the current members.

9. Model Specification – General
9.1.1 Classes are designated by internal combustion engine size and type of ignition system used. They are as follows: –
-Z Class 0 – 2.10cc (0.129 cu in) Non spark ignition
-AA class 0-7.50cc (0.21 cu in) incl(0.21-0.46 cu in) sport section. Non spark ignition.
-A Class 3.51 – 7.50cc (0.46 cu in) Non spark ignition (All .46 size engines are approved for this class)
-B Class 7.51 – 11.0cc (0.67 cu in) Non spark ignition
-C Class 11.01 – 50cc (3.05 cu in) Non spark ignition
-D Class 0 – 26cc (1.586 cu in) Spark ignition only
-E Class 0 – 65cc (3.967 cu in) Spark ignition only
Boats other than those using an internal combustion engine [glow or petrol] are not eligible for OMRA championship classes.
9.1.2 Any mix of fuel is allowed in all classes.
9.2 Boat class plus OMRA membership number must be visible from both sides of the boat. Numbers to be at least 2 inches or 50mm high. i.e. ‘Member 24’s A’ class boat = A24, ‘B’ class boat B24 etc, NB:- Z class only require their OMRA membership number. Membership numbers are issued by the association and remain the property of the association at all times.
9.3 A failsafe must be fitted to the throttle system and be in working order at all times for all classes.
9.4 A form of grab handle must be fitted front and rear of all boats and must be clear of exhausts, outdrives etc, In addition – On large craft with an overall bow to stern length of 50 inches or more excluding running gear, outrigger unit etc, a lanyard/painter must be fitted (i.e. piece of rope or similar for towing a model.)
9.5 A scale driver or crew consisting of at least head and shoulders must be fitted to all boats that have an open cockpit. Also they must be painted to resemble their full size counterparts.
9.6 An internal exhaust system is to be fitted and may protrude up to a maximum of 2.5 inches or 65mm past the stern of the boat irrespective of shape, unless photographic evidence of the genuine full size craft is provided in which case the hot area of the exhaust must be covered.
9.7 Drive systems can be direct or geared, submerged or surface drive.
9.8 Models to represent their full size offshore type counterparts as much as possible.
9.9 Models must run in a complete state at all times i.e. with tops fitted unless it has been irreparably damaged or lost during the race.
9.10 Models must comply with the noise limit of 80db or less at 10 metres at all times. If a model fails to comply with the noise limit it must leave the water immediately. It may be returned to the water after any necessary adjustments to comply with the noise limit. However, if it still fails to comply the model will be immediately disqualified.
9.11 Models can only be operated in OMRA events on legal radio frequencies.
9.12 All transmitters must have the proper manufactured end on the tip of the aerial.
9.13 All boats (excluding ‘specialised designs’ such as Tunnel Hulls and Ribs) must have at least 50mm (2 inches) of side height. “Side height” in this case being the measurement of the maximum distance between the chine rail and deck.
9.14 Boats designed with rounded or chamfered edges to the deck will have their side height measured vertically from the chine line to a point halfway round the curve or chamfer. Rounded decks are not allowed to meet at the chine line directly unless it is a feature of a model of a full size offshore race boat.

10. Model Specifications – Class Restrictions
Standard Z Class
10.1 The internal combustion engine must be a standard 0.12 cu in but no engine price limit applies.
10.2 No gearbox of any sort is allowed.
10.3 Drive to be submerged only. (Propeller situated under the hull of the boat and not protruding past the point where the bottom of the boat meets the transom).
10.4 Rudders may be mounted on the transom of the boat.
10.5 Tuned pipes may be used.
Modified Z Class
10.6 No engine price limit
10.7 Drive systems can be direct or geared, submerged or surface drive.

D Class
As per E Class but with the following restrictions:
10.8 Engine limited to max swept volume of 26cc spark ignition, petrol.
10.9 Internally standard, unmodified production “off-the-shelf” engines up to 26cc with a single piece “open port” cylinder from manufacturers Including (but not limited to): Zenoah, RCMK, CRRC-PRO, Tiger King, SIKK and similar. (Modifications or deviations from factory specification of the piston, cylinder block, crankshaft, crankcase, conrod, and bearings are totally prohibited). NOTE: Engines with a separate liner and head button are not permitted in this class, only those with a single piece cylinder.
Standard, internally unaltered versions of the following are eligible:
Zenoah: G230PUM, G260PUM
RCMK: S254, R254 – (No longer readily available)
CRRC-Pro: GW26i
Tiger King: S26 Open Port (S26 EVO is not eligible)
SIKK: 26cc Marine (No longer readily available)
10.10 RTR Boats featuring engines conforming to Rule 10.9 such as ”Clone” Chinese copies of the above or similar are eligible, but must comply with all OMRA general class regulations in section 9 and feature a failsafe.
10.11 CMB, Quickdraw, J&G, M&D, B&H Hanson engines will NOT be eligible as these are already deemed to be high performance engines.
10.12 Hull length is limited to a maximum length of 64”.
10.13 Any make of unmodified carburettor is permitted.
10.14 An exhaust of tuned length may be used ( cheap Jonny Chung/Jereome/Chinese styles) with a standard header. No high performance Quickdraw hot pipes, CMB or any other high performance pipes from engines banned in the category.
10.15 External “ancillaries” to the engine may be substituted or removed providing they have no known effect on enhancing the performance of the engine. [A pull-start substituted for a pulley start, by way of example]
10.17 Scrutineering of engines may take place on a random basis by a person nominated by either the OOD or OMRA Chief Technical Officer. Any members entering boats run in this class found to be in deliberate breach of class rules will have any and all D class championship points gained up to that point removed, and will be disqualified from the D class for the remainder of the season.

AA Class
10.18 Engines up to 3.5cc can be any configuration/gear boxes/specification (within class limits).
10.19 Engines larger than 3.5cc up to a maximum of 7.5cc must be of a front induction side exhaust configuration (ie. sport engines). Gear boxes and rear induction side ported engines are not permitted on engines between 3.5 and 7.5cc in AA Class.

11. Races
11.1 OMRA rules will be upheld at all championship events.
11.2 Only current members may operate in OMRA championships or other approved OMRA events. Members may be called upon to prove their membership is current at any time.
11.3 At OMRA events all drivers must have a ‘spotter’ during racing to inform them of any obstacles on the course, pass on information and assist them with their boat or equipment etc,
11.4 A competitor may only enter and run one boat in each class.
11.5 A model may be run more than once in the same class only if operated by a junior and their parent or guardian or if falling into A or AA Classes as designated by the class limits.
11.6 An AA or A class boat is eligible to race twice in 2 different classes, if desired, at the same event. The boat must run first in it’s primary class and then if the owner wishes can race again in the next class up. ie…AA must race in own class first and then again in the A class.  (This rule does not apply to other classes). An A class boat must run in its own class first, and may run again in the B class (always primary class first in the case of a 2 heat race day).  Rule 11.4 still applies.
11.7 Three types of racing are to be used for championship events: 1. Chaseboat 2. Endurance 3. Sprint
11.8 During an OMRA event all participants have a personal responsibility to ensure that Health and Safety issues are observed and that where necessary any concerns are brought to the attention of the Officer Of The Day.

12. Chase Boat event
12.1 Course to be a minimum of two miles in length.
12.2 Models to be individually timed, the maximum time limit for the run to be set by the Officer Of The Day based on conditions of the day.
12.3 Re-runs will only be permitted if the chase boat breaks down or is too slow.
12.4 On-course restarts are permitted within the time limit unless otherwise directed by the Officer Of The Day at the beginning of the event.
Note: – Run finishes when model crosses the finish line or the time limit has expired, which ever comes first
12.5 Competitors, spotters and rescue crew will wear lifejackets at all times. The chase boat motor should have a ‘dead man’s handle’ fitted wherever possible.
12.6 DNF Scoring – Boats that gain a DNF after the halfway/intermediate point as set by the OOD be given a level share of Championship points from the remaining positions, after those points have been apportioned to those boats who complete the course.
Those that DNF before the halfway point will be given a level share of Championship points from the remaining positions, after points have been apportioned to those boats who complete the course and those that complete more than half the course. Points in all cases above 0.5 and above, will be rounded up to a whole number and points split below 0.5 will be rounded down to whole number points.
[Example: 3 boats in a class complete the course and 3 have DNF’s but stop after the intermediate point. They each get a level share of 4th 5th and 6th points (a total of 19 divided by 3 = 6.3) and this is rounded down to 6 points each. The remaining DNF’s before the half point (eg. 2) will each get a level share of 7th and 8th points (a total of 7 points divided by 2 = 3.5 and rounded up to 4).

13. Endurance Race Event
13.1 Course to be approximately 300 – 400 yards around 3 to 4 marker buoys or as determined by the water available and by the Officer Of The Day. This will be raced in a clockwise direction.
13.2 Race duration is to be left up to the race organizer as long as the total race time adds up to a minimum of 30 minutes or up to a maximum of 60 minutes. Race organizers are encouraged to divide the total race time into two separate heats per class when ever possible.
13.3 A designated area next to the waters edge to be set up as the pit area at all events. This is the only area in which a boat’s engine may be started for the purpose of running in a heat ie: there will be no carrying of boats with engines running outside this area.
13.4 Races may be started with a full course mill start or where the location allows, a safe dead engine start.
– A mill start allows competitors to release their models onto the water and proceed in a clockwise direction 2 minutes before the start of the race. Models will then travel the full course during this time with the aim of approaching the start line at the end of 2 minutes. Any cutting of the course during this stage will attract a 5 lap penalty.
– A dead engine start, as the name implies, requires that all engines be stopped one minute before the start of the race. Then, at the start signal, engines are started, models launched and racing begins immediately.
13.5 A standard start will be used for the races by use of blasts from an air horn. One blast for start of mill time, two blasts for the start of the race and three blasts for the end of the race. At any time, more than three blasts indicates danger and racing must stop immediately.
13.6 A model will start to score laps from the first time it crosses the start line after the start and must complete each time a full circuit of the course to register laps. Any model jumping the start will have to do another legal lap before being counted.
13.7 Models that fail to start or have stopped may join or rejoin the race when safe to do so.
13.8 There will be rescue available during the course of the race for any model that has stopped. The rescue boat will be manned by two persons over the age of 17 years who must wear lifejackets when in the boat. The wearing of hard hats is recommended but not compulsory. The rescue boat has the right of way at all times and all boats must visibly slow from racing speed when passing the rescue boat. Failure to do so will incur penalties. There should be a ‘dead man’s’ handle fitted to outboard engines wherever possible.
13.9 Where practicable, the rescue boat is to be equipped with 2-way radio in order to communicate with ODD or deputy on shore.
13.10 When the end of the race signal is sounded, the boats will complete the lap they are on before returning to the pits in a safe manner, cutting the course will draw a penalty.
13.11 The overall winner is the person who has the highest laps in combined heats. In the case of a draw the Championship points will be given as equal in the higher position…eg Boats finish equal third…10 points will be awarded to both. If a trophy position is at stake then this will be decided by the flip of a coin or at the agreement between the drivers. If in the case of a draw in the overall Highest laps of the day, it will be given in favour of the boat in the lower class.

14. Sprint Race Event
14.1.Sprint cousre to be laid the same or similar to an endurance race or at the discretion of the OOD.
14.2 Boats to be timed individually around 5 laps of the course with start and finish being the same marker.
14.3 Competitors will be given 5 minutes to start and complete the 5 lap sprint. A maximum of 2 laps will be allowed as warm up laps.
14.4 Two stoppages (or at the OOD’s Discretion) during the timed section will be allowed. Once the boat stops the clock will stop until the model is recovered. When the boat returns to the water the clock will restart when it again passes the start marker. Only full laps will count towards the final time. eg if a boat stops 2.5 laps into it’s time the half lap will not count on re-starting, it must then travel 3 further full laps.
14.5 If a competitor decides to pit the boat during the timed section the clock will continue until the engine has stopped or is out of the water. If the engine remains running the clock with remain running.
14.6 If the set time limit is up and the boat is still on course it may complete the required laps and be given a time. If however it stops after the expired time limit it will not be allowed to re-start and be given a DNF (did not finish).
14.7 The intention of this type of racing is to be quite a relaxed affair. The discretion of the OOD/race organiser shall apply to all aspects of the race.
14.8 Championship points will be awarded for these events.

15. Driving infractions
15.1 The following rules are mandatory. Disregard of them will be judged to be an infraction and will result in a warning, lap deduction, heat or race penalties or disqualification.
15.2 All competitors are to race with due regard for safety at all times.
15.3 Deliberate obstruction, zigzagging, or overtaking in such a way that avoiding action has to be taken will draw a penalty.
15.4 The natural race lane is the lane that is nearest the course line and is considered to approximately 1 metre wide. This lane has the right of way at all times. The right of way principle also applies at all turns.
Any boat wishing to overtake to occupy the race lane must establish a minimum safe distance of three boat lengths in front of the boat passed before gaining the right to that lane. Any boat going wide forfeits its right to the race lane.
15.5 Penalties
Infractions of the above rules will normally incur penalties as follows; –
Hitting the rescue boat at ANY time during the day – immediate disqualification.
Cutting the course on mill start or end of race. – 5 lap deduction.

Driving infractions
– 1st offence a warning.
– 2nd offence 5 laps deduction.
– 3rd offence disqualification.
15.6 Any buoy missed during the race must be re-circled safely by turning inside the course; otherwise the lap will not count. The Officer Of The Day may advise drivers to miss buoys during the race on the grounds of safety; there will be no penalty for this.
15.7 If a driver is disqualified he is to be advised as soon as possible at which time he must be able to acknowledge the fact and immediately remove his model from the water. Disqualification means that the offending driver may take no further part in this class in this event and that any lap or time score achieved so far is disregarded. (The boat may still be run again by a non-offending junior or guardian).
15.8 If, in the opinion of the rescue crew or the OOD, a model is driven too close to the rescue boat or in a manner that endangers them, then the OOD shall disqualify that driver and model immediately. If the driver continues to drive in different classes in a similar manner, then that driver can be banned for the whole meeting.
15.9 If, during a heat, if a competitors boat hits a dead boat* at full throttle without noticeably throttling back or taking evasive action, a 5 lap penalty may be applied. [*This does not refer to boats which have either spun or stopped immediately in front of the boat which collides with it, but applies to boats which have been dead in the water for a period].

16. Championship Scores
16.1 Championship points will be awarded at all championship events to OMRA members only if championship legal i.e. if models conform to the Model Specification.
16.2 Points are awarded as follows:-


Countback.  (reintroduced following 2016 AGM)
Count back is where the finishing order is recorded and in the event of a tied laps scores the boat with the least count back recorded is the winner. Where tied lap scores over two heats occur, the total countbacks for each racer over the two heats are evaluated. The racer with the lowest total count back score wins.

16.3 Disqualification means no points are awarded.
16.4 The number of championship rounds/scores to count towards the championship will be set at the Annual General Meeting proceeding the championship season.
16.5 The following trophies to be awarded at all championship events: –
– Fastest time/Highest laps of the day.
– Concourse d’elegance.
– 1st, 2nd, & 3rd. for each class.
16.6 In the event of a tie for 1st, 2nd or 3rd place in the championship on points then the most number of 1st, 2nd or 3rd places during the season are to be taken into consideration.

17. Perpetual Trophies
17.1 Award Titles – British Champion for each class.
-Champion Of Champions – best two class scores.
-1st. Lady Of OMRA – highest score in any class by a female driver.
-Best Junior – highest score in any class by a Junior Member.
-Concourse d’elegance – best finished boat
-Engineering – best engineered boat
-Max Coote Trophy – Best hull designer, Z class
17.2 Annual honours can only be gained by a model that has competed in at least two championship events during the season.
17.3 Keepsake trophies will be awarded along with Championship winners stickers that may be applied to the class winning members boat during the following season.
17.4 All annual trophies are to be presented at the Annual General Meeting.
17.5 Perpetual trophies are to be returned before or at the Annual General Meeting.
Note: – any member winning a championship class on three consecutive occasions will be awarded a special trophy to mark the achievement (as from 2002).

18. Officer Of The Day
The following information is for guidance of The Officer Of The Day at championship and non-championship events.
18.1 Hold a drivers meeting to clarify all rules before the start of the event especially if any specific rules apply to the venue. It is the competitor’s responsibility to attend these meetings.
18.2 The Officer Of The Day has the final decision on all organisational arrangements of the event within the scope of the Rules. Guidance may be sought from the committee members or Race Committee members available and final decisions regarding OMRA interests will rest with the Committee.
18.3 The Officer Of The Day will have an OMRA rulebook available at the event.
18.4 At all OMRA events it is the responsibility of the Officer Of The Day or designated person to check that all boats comply with the model specification. Any non-compliant boats may only be run at the end of the day, time permitting, at the discretion of the OOD.
18.5 The Officer Of The Day is to post results when possible.
18.6 The Officer Of The Day is to ensure that lifejackets are worn at all times in the rescue and chase boats. The wearing of hard hats by the crew of the rescue boat is recommended but not compulsory.
18.7 Any members taking part in OMRA events may be called upon at any time to assist the Officer Of The Day with the responsibilities of running the event. It is the responsibility for the OOD to appoint at least one assistant OOD or as many as preferred.

19. Event Organisers
19.1 Event organisers to submit their proposed dates to the Secretary, prior to the AGM if possible. (The committee will plan for events to be 3 weeks apart whenever possible).
19.2 Under normal circumstances only one endurance race event may be used for a championship round at each venue per year. However, providing that all venues submitted for championship racing in any given season are taken up, a venue may be used for a championship endurance race on more than one occasion, as decided by the committee. A chase boat event may be held on one or more occasions as a championship event at the same venue per year
19.3 Accommodate all competitors at championship events by adjusting the race duration, within the rules, accordingly. Choice of frequency is on a ‘first come first served’ basis. Entries will not be accepted after 9pm two days before any event (i.e. Friday 9pm for a Sunday event) other than with the OODs discretion.
19.4 Organisers must advise the committee if they wish their event to be used as a championship event. Championship events must be run to OMRA rules.