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x.2 In the case of a boat rated as a one-design, and when her IRC crew limitation exceeds her one-design class crew limitation, a boat shall comply with her one-design class rules.

[x.3] [There shall be no restriction on crew changes.] [The following crew change restrictions shall apply:]

It is recommended that when any Crew Number or weight limitations are in force, Race Organisers should publish the crew limit for each entry (the online IRC listing includes IRC Crew Number).

Generally, except for safety reasons, specifying a minimum Crew Number is not recommended. However, Race Committees may impose a maximum variation in Crew Number or weight to prevent boats leaving crew ashore on light weather days.

2.5.2 Crew Classification

IRC Rule 22.5 notes that IRC contains no restrictions on Crew Classification, in other words professionals and amateurs, but a Notice of Race may impose restrictions. If an Organising Authority wishes to impose restrictions, it is strongly recommended that the World Sailing Sailor Classification Code is used. In international events invoking Crew Classification, the use of this particular Code will be a prerequisite.

Noting the variety of restrictions that might be included, it is not possible to suggest a specific clause for a Notice of Race.

2.6 IRC Classes

Apart from the obvious splits by TCC, boats may also be split into classes by type. IRC rates a wide variety of boats ranging from classics through to high- tech racers and ‘sportsboats’. Each of these has its own performance profile resulting in race results becoming increasingly dependent on conditions and course type (see Section 5.). As a general principle, when fleets are large enough, splitting boats by boat type and/or size or speed, for instance separating ‘sportsboats’ from ‘cruisers’, can be to the benefit of all and is highly recommended.

Physical parameters can be used to define different classes and the following outlines some of the options:

Displacement Length Ratio (DLR) Within the IRC fleet as a whole, average DLR is around 200. Typical modern cruisers are generally in the range 200 to 300. Modern cruiser/racers fall largely between 150 and 200, with boats below 150 being modern racers, racer/cruisers and sportsboats. A simple split by DLR alone may, however, be unsatisfactory as DLR tends to reduce with increased boat size and vice versa. To better define a class it is advisable to combine it with size limitation(s) and possibly a third criterion (see the example of ‘Sportsboats’ below)

Hull Factor (HF) This can be used to separate cruisers (lower HF) from racers (higher HF). Typically, boats with Hull Factors of 7.6 and below will be cruisers, but again a secondary factor may be needed to remove anomalies. In this context, an associated minimum DLR can work to define a cruising class.

Age or Series Date Probably the best use of age is in identifying ‘classic’ boats, and qualifying dates are of course at the discretion of Race Committees. It is recommended that Series Date is used to include or exclude all boats of the same design if applicable.

Sportsboats While the criteria are not defined in IRC, and may vary depending on local fleets, a sportsboat may generally be defined as having a DLR of less than 150, LH less than 10m, and TCC greater than 0.950.

A clause to encompass some of the above might incorporate any of the following:

Notice of Race: x.0

Class 0

Boats shall race in the following classes: Rule/Type

Parameters Racing

1 2 3 4 5 6


IRC/Cruisers IRC/Classic Sportsboats

LH greater than 9.0m and less than 16.5m. IRC Series Date: 2000 and later. IRC Hull Factor: 10.4 and higher. IRC DLR: 145 and lower. IRC TCC: Greater than 1.000 and less than 1.350. TCC 1.100 to 1.199. TCC 1.000 to 1.099. TCC 0.999 and below.

IRC Hull Factor 7.6 or less. IRC Series Date of 1970 or earlier.

DLR less than 150, LH less than 10m, and TCC greater than 0.950

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x.1 x.2 x.3 x.5

A boat which meets all the requirements for Class 0 shall race in Class 0.

A boat which meets the requirements for both Classes 4 and 5 shall race in Class 5.

A boat which meets all the requirements for Class 6 shall race in Class 6.

Classes may be altered, amalgamated or divided at the discretion of the Race Committee. The Race Committee may specify that all boats of a particular design shall race in the same class.

2.7 Endorsed Certificates

An Endorsed certificate is one where the rated data has been verified by measurement or other means, and this usually incurs a cost to the boat owner. Race Committees should therefore consider carefully before requiring all entrants to hold Endorsed certificates. Many less serious competitors will be discouraged from entering at all, while the more serious are probably already Endorsed. To avoid deterring possible entrants the second option below may be more appropriate.

Notice of Race: x.0 Boats in Classes 0, 1, and 2 (3, 4, 5 etc) shall hold IRC ENDORSED certificates.


x.0 To obtain class and/or overall points and/or club championship points, a competing boat shall (at the time of the race for which points are being awarded) hold an IRC ENDORSED certificate. Boats not holding ENDORSED certificates shall not be included in any points calculations.

The second option allows a boat without an Endorsed certificate to compete in an individual race, but she will not gain points towards an overall trophy.

An Endorsed IRC certificate may have been issued with a boat weight derived from another rating certificate (e.g. ORCi DSPM), as allowed by IRC Endorsement guidelines. However, an Organising Authority for a race might include a requirement that all boats shall have been weighed to establish boat weight for their Endorsed certificates.

IRC Rule 8.5 is specific that an Endorsed certificate will (irrespective of certificate print language) carry a Rating Authority ENDORSED stamp. Other IRC certificates will carry a STANDARD certificate stamp.

2.8 Non Spinnaker Ratings

IRC certificates for all boats also show a non spinnaker TCC. Race Committees’ attention is drawn to Rule 8.6 which restricts the use of this TCC to races specifically defined as non spinnaker. This restriction is deliberate and is to prevent abuse of the non spinnaker TCC. Note however that IRC Rule 11.1 permits a Notice of Race to modify this Rule.

2.9 Short -Handed Races

IRC Rule 8.2 permits a boat to hold a second, concurrently valid, IRC certificate for use in short-handed (i.e. maximum 2 crew) races or classes. This permits an owner to configure his boat differently for short-handed racing without the need to continually change his IRC certificate.

The short-handed certificate is ONLY valid for racing in a short-handed race or class and may NOT be used as an alternative certificate for racing in a standard class. If a boat holds a short-handed certificate she cannot use her

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