TBCC utilises ‘Yacht Systems’ software for processing race results and calculating handicaps. It’s widely used by a number of yacht clubs around NZ.
The information below will clarify how the Yacht Systems handicapping process works.
All yachts entered in Club Events are handicapped by the handicappers on the Sailing Committee and all communication regarding handicapping should be addressed to the Sailing Committee in writing.
Handicapping Method Used by TBCC – Yacht Systems software
Up to five ‘sailed to’ values can be considered for each yacht. Raced ‘sailed to’ values will be ‘clamped’ to within a set percentage of the current race TCF, and ‘sailed to’ values falling above or below a yacht’s clamped race tcf value will be restricted to the clamped value. Where a ‘clamp limit’ has been set, ‘sailed to’ values above or below this limit will be ignored. New handicaps average a yacht’s current race tcf plus the nominated number of its ‘sailed to’ or ‘clamped’ values. The base yacht should be at or close to the 50th percentile position to help avoid handicap creep.
Base Position : A physical yacht’s position (as a %) within the fleet or division around which all other new handicaps will move. Currently set at 45%.
So if 10 boats race, the boat that finishes mid fleet is assumed to have sailed to their handicap rating. All boats finishing ahead are assumed to have sailed at a higher rating and will be adjusted upwards, and all boats finishing after are assumed to have sailed at a lower rating and will have a downward adjustment. Bearing in mind the method used below …..
Method Used :
(a) The ‘Upper clamp’ percentage value (currently set at 5%) above which a good performance will be reduced. The higher this value the fewer very good performances will be clamped downward.
(b) The ‘Lower clamp’ percentage value (currently set at 5%) below which a very poor performance will be increased. The lower this value the fewer very poor performances will be clamped upward.
(c) A percentage ‘Clamp limit’ beyond which a performance will be disregarded. Set to zero (i.e. 0) as no limit is wanted.
(d) The number of most recent ‘Sailed to’ race performances (currently set at 3) used to calculate the new handicap. Historic performances may be saved as the ‘clamped’ value. The higher this number the slower the movement of new handicaps.
Every boat has a Calculated handicap and a New handicap.
The New handicap is derived by an adjustment for ‘handicap creep’.
The ‘handicap creep’ adjustment is applied after each race to ensure that the average handicap for each division remains the same after each race. This allows boats to do better or worse against each other but not for the whole division performance to change.
Other handicapping systems
TBCC occasionally makes use of RaceTrack for mixed fleet events – such as the annual Regatta – as there are no TBCC results and handicapping for out of town boats. This is used as a yardstick to allow us to set comparative handicaps.
The reason the Club doesn’t use this universally is that RaceTrack averages every single race the boat has participated in since it was built – even if it changes names. A series of good or bad performances doesn’t really affect the RaceTrack rating as it’s averaging such a large number of races. It’s very slow to respond. RaceTrack also doesn’t take into account different types of races or conditions. The Club maintains several different handicaps for each boat – winter, offshore, short handed, Wednesday night etc – which take into account the differing conditions and types of race. No one single handicap can accurately reflect all of these requirements.
PHRF (Yachting NZ)
The Club has from time to time made use of PHRF – which is a quasi measured rating set by Yachting New Zealand. This is set annually and is based on sail measurements as well as performance. The Club encourages skippers to apply for a PHRF rating as this is a good indicator of performance over a season. So few of the Club’s fleet have a rating which is why results are not currently published. However with significant numbers – say 10-12 in a fleet – we would return to publishing them.
2019/2020 – Minimum handicaps for division splits
Wednesday night racing will have the following minimum handicaps :
Div 1 – .800
Div 2 – .700
Div 3 – no limit
If you wish to change divisions please apply in writing to the Sailing Committee.
If a boat’s handicap drops below the minimum during a series it will be allowed to do so but will be adjusted back up to the minimum entry point at the start of the next series.
How are handicaps derived for new boats?
If the boat is a standard class ie Young88, Farr1020 etc, then a mid fleet RaceTrack rating is usually given. If it’s not of a standard class, or has little racing history, it will be assigned a similar handicap to the nearest type of boat in the Club’s fleet. In both cases progress is monitored and adjusted if necessary.