IRC 2014 TCC changes

 

Download PDF version with French translation

For 2014, the IRC Technical Committee has made a number of changes to the calculation of IRC TCCs.

Most of these have small effects, or affect only a small minority of boats. In a number of cases, they either simplify the IRC software or make it more logical, without intent to change TCCs. Any effects in these cases are therefore also small and are not discussed below.

In other cases, the intent of the changes is either to directly improve how IRC treats particular features on boats, or to address actual or potential abuse of IRC; these are discussed below. In all cases however, the Technical Committee is constrained in the level of detail that can be disclosed, due to the unpublished nature of IRC calculations.

1. Hull Material

Historically, the use of Kevlar in a boat's hull structure attracted a small increase in TCC. As forecast in 2013, this has now been removed.

2. Adjustable Mast Foot/Forestay

The TCC cost of these has been reduced. Additionally, boats are now rated according to whether they can adjust one of either the mast foot or the forestay when racing (with the effect on TCC being the same for each one), or both (with a greater effect on TCC). This change affects a small minority of boats only.

3. Bulb Keels

The effect of bulb weight has been reviewed with the outcome that the TCC cost of heavy bulbs has increased. In practical terms, this change will only significantly affect light 'racing' boats

4. Runners and Checkstays

A minor software error has been corrected such that (as was intended for 2013) the TCC cost of runners and checkstays is now the same.

5. Non Spinnaker TCC

A small change has been made to the calculation of non-spinnaker TCC resulting in a generally small increase in non-spinnaker TCC (or TCC for boats rated without spinnakers).

IRC Notice 2013/03 Mast Foot & Forestay 2014

IRC Notice 2013/03

Adjustable Mast Foot and Forestay, 2014

Download PDF including French translation

The IRC Technical Committee has reviewed its decision earlier this year to amend the treatment of Adjustable Mast Foot and/or Forestay as announced by IRC Notice 2013/02, Adjustable Mast Foot and Forestay, 2014.

As a result, IRC Notice 2013/02, Adjustable Mast Foot and Forestay, 2014, is withdrawn and replaced by the following.

1. The text of IRC Rule 21.1.6 (b) will remain unchanged for 2014.

2. Boats will therefore retain the right to declare that they will not use while racing any systems capable of adjusting the mast foot and/or the forestay.

3. The rating adjustment will be reduced to approximately 50% of the current level and will in future be linked to the type of boat.

4. A boat with equipment capable of adjusting both the mast foot and the forestay will be rated higher than a boat capable of adjusting just one of these.

5. For guidance purposes only, the 2014 levels of adjustment will be of the order of:

Boat                               Either mast foot or forestay adjustable  Both mast foot and forestay adjustable
 Typical cruiser/racer    +0.001  +0.002
 52' racing boat   +0.002  +0.003
 70' racing boat  +0.003  +0.004

6. The IRC Technical Committee considers that if a boat declares it will not adjust the mast foot or forestay while racing, but then actually does so, this would be committing a gross breach of a rule. Any such instances would be reported to the boat's MNA requesting action under RRS 69.

IRC Technical Committee
November 2013
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