Ratings system

Historical 18Ft Skiff Authenticity Rating Guidelines

Historical 18Ft Skiff Authenticity Rating Guidelines

Background

The current fleet of replica 18ft skiffs, known as Historical 18ft skiffs, is made up of boats that represent variations in the design and technology of the various eras of 18ft skiff racing spanning the period from 1906 to 1950. There is a wide variation in the application of the term "replica" to these boats, and for all sorts of reasons (cost, sourcing of materials, practicality, etc) there are a variety of equipment, rigs and construction methods that have been used to create these boats in order for them to fulfill their desired destiny of just getting on the water to provide the unique form of racing and enjoyment as their predecessors once did.

Regular club racing for these boats is run under Mark Foy system of handicap starts, where the handicaps are based on a performance handicap system that is automatically adjusted from week to week based on results. This system works well for such disparate boats, often provides for some interesting finishes, and over the course of an entire season generally rewards consistency.

Championship events such as Club championship, Australian and International events are run using scratch starts and inevitably the fastest boat will win. Apart from being well sailed, the result may also be due to the boat being based on a design from the latest permissible design era (ie 1950, 6ft beam) and/or it may be due the equipment and construction used on the boat which is more closely aligned with performance than authenticity.

Neither of the above race formats encourages nor rewards the level of authenticity of the "historical" skiffs when they compete. Without an emphasis to maintain the authenticity of the replica skiffs, there is a real danger the authenticity features could be lost altogether in pursuit of performance based race results.

Consideration has been given to developing a rating system that would address the following:

  1. 1.Accommodate combined racing of boats from different eras whilst rewarding those replicas skiffs that are more authentic.

  2. 2.Encourage existing boats to consider authenticity when upgrading gear.

  3. 3.Encourage prospective owners and builders to build authentic replicas from any era, in the knowledge they can still be competitive in the combined fleet racing.

The Authenticity Rating System

Each boat is allocated a Time Correction Factor (TCF) that is applied to its actual race time to produce a boat's corrected race time. Overall placings for a race are then based on corrected race time.

The calculation of the TCF for each boat is based on an assessment of the respective authenticity items of the boat, with time adjustments applied to each item. Authentic items are encouraged and receive the allocated time adjustment whilst non-authentic items are penalized and receive a reduced or negligible time adjustment.

The sum of the time adjustments for all items will produce a total time adjustment, which is then used in the calculation (based on a nominal 2 hr race time) to derive the TCF.

IeTCF = (120 - total time adj.) / 120.0

The TCF becomes a boat's Authenticity Rating

eg.

Actual race time

TCF

Corrected race time

1hr 40mins

0.895

1hr 29min 30sec

1hr 40mins

0.905

1hr 30min 30sec

Authenticity Items (pre October 2008)

The following were used for the 2007-2008 Season in assessing a boat's authenticity:

Authenticity Item

Time

Adjustment

Criteria

Design

0.5 min

If to original plan or model

Planking

0.5 min

0.25 min

0.0 min

Traditional planking

Laminated to look traditional

Other

Structure

0.5 min

0.25 min

0.0 min

Size of ribs, planking and stringers, spacing of ribs, etc is similar to original.

Traditional layout but lighter scantlings

Not traditional

Fastenings

0.5 min

0.25 min

0.0 min

Ribs and battens nailed

Ribs only nailed

No nails

Lee Cloths

0.5 min

0.5 min

If lee cloths installed

If original design is before 1910 when there were no lee cloths

Rudder

0.5 min

If shape of rudder as per original boat

Fin

0.5 min

If fin of original size and shape and of metal

Spars Material

  1. 1.0min

0.5 min

If all spars are wood

If mixed (some spars are of wood)

Spin Poles

0.5 min

If spin poles are wood

Fit-out

0.5 min

0.25 min

If all blocks & ropes are traditional style

If mixture of traditional and modern (all boats currently)

Pumps

0.5 min

If boat does not have a pump that can be worked from the gunwale

Luff/foot ratio

1.5 min

If luff to foot ration of the mainsail is true to original boat's rig

Gaff / Gunter

1.0 min

If style of rig and angle at throat is true to original boat's rig

M'sail Roach

1.0 min

If mainsail roach/round is similar to original boat's rig

(Jenny 4 currently carries an arbitrary +2 min penalty)

Jib

0.5 min

If jib is to original style and shape and is not overlapping

Spinnaker

0.5 min

0.0 min

If spinnaker is single luff traditional style.

If spinnaker is double luff

Ringtail

0.5 min

If ringtail set during the race (applied to produce an additional TCF to include this option)

Era Allowance

9.0 min

3.0 min

0.0 min

Pre 1932 boats

1932 - 1948, 7ft beamers

post 1947 6ft beamers

Age allowance

Calculated

5.0 secs per each year elapsed between launch of original and 1950

Replica Allowance

Calculated

0.25 min per year elapsed between launch of replica and current year

Authenticity Items (from October 2008)

The following to be used for the 2008-2009 Season in assessing a boat's authenticity:

Authenticity Item

Time

Adjustment

Criteria

Design

0.5 min

If to original plan or model

Planking

0.5 min

0.25 min

0.0 min

Traditional planking

Laminated to look traditional

Other

Structure

1.0 min

0.50 min

0.0 min

Size of ribs, planking and stringers, spacing of ribs, etc is similar to original.

Traditional layout but lighter scantlings

Not traditional

Fastenings

0.5 min

0.25 min

0.0 min

Ribs and battens nailed

Ribs only nailed

No nails

Lee Cloths

0.5 min

0.5 min

If lee cloths installed as per original design

If side deck used as per original design (eg design is before 1910 when there were no lee cloths)

Rudder

0.5 min

If shape of rudder as per original boat

Fin

0.5 min

If fin of original size and shape and of metal

Spars Material

1.5 min

If all spars are wood

Spin Poles

0.5 min

If spin poles are wood

Fit-out

0.5 min

0.25 min

If all blocks & ropes are traditional style

If mixture of traditional and modern (all boats currently)

Pumps

0.5 min

If boat does not have a pump that can be worked from the gunwale

Luff/foot ratio

1.5 min

If luff to foot ration of the mainsail is true to original boat's rig

Throat Angle

1.0 min

If style of rig and angle at throat is true to original boat's rig

M'sail Roach

1.0 min

If mainsail roach/round is similar to original boat's rig

(Jenny 4 currently carries an arbitrary +2 min penalty)

Jib

0.5 min

If jib is to original style and shape and is not overlapping

Spinnaker

0.5 min

0.0 min

If spinnaker is single luff traditional style.

If spinnaker is double luff

Ringtail

1.5 min

If ringtail conforms to design definition and is set during the race (applied to produce an additional TCF to include this option)

Development Allowance

6.0 min

3.0 min

0.0 min

Pre 1932 boats

1932 - 1948, with 7ft beam

post 1947, with 6ft beam

Original Age Allowance

Calculated

5.0 secs per each year elapsed between launch of original and 1950

Replica Age Allowance

Calculated

0.25 min per year elapsed between launch of replica and current year