I think RYA will not be able to answer your question.

The reason being the NHC is designed to be used in your fleet with the actual performance of an individual boat in its current setup and crew against the mean of fleet. If you take that boat and put it in a different fleet it will require a new NHC rating. If the boat and crew perform above their normal they will be ranked highly in that race and may even win.

The system I use is to convert the published ratings to a TCF rating and use that as the starting point. For example a Laser full rig has VYC of 114 and a Laser Radial has a VYC of 118.8. this would convert to 0.877 for the full rig and 0.844 for the Radial. I then use this as a starting rating, as the differing speeds of the boats has been removed leaving the quality of the equipment and the crew as the variables.

If there is published rating on the boats in your fleet, or you have actual data on the performance of the boats in question you should be able to to calculate a starting rating.

It is common to see a performance difference of 15% to 20% between the quickest boat and the slowest boats in a fleet. So if you have someone who is clearly a beginner you could allow then a further 10% or so. Remember the bigger the TCF the faster the boat.

As another responder has mentioned the system self-adjusts. I think you need at least 5 races to get the system to start getting close to an accurate figure for the boat in question.

From a quick look at the specifications of the 2 boats in question I would expect 1 would be much quicker than the other, so should have a differing starting ratings.

I think RYA will not be able to answer your question.

The reason being the NHC is designed to be used in your fleet with the actual performance of an individual boat in its current setup and crew against the mean of fleet. If you take that boat and put it in a different fleet it will require a new NHC rating. If the boat and crew perform above their normal they will be ranked highly in that race and may even win.

The system I use is to convert the published ratings to a TCF rating and use that as the starting point. For example a Laser full rig has VYC of 114 and a Laser Radial has a VYC of 118.8. this would convert to 0.877 for the full rig and 0.844 for the Radial. I then use this as a starting rating, as the differing speeds of the boats has been removed leaving the quality of the equipment and the crew as the variables.

If there is published rating on the boats in your fleet, or you have actual data on the performance of the boats in question you should be able to to calculate a starting rating.

It is common to see a performance difference of 15% to 20% between the quickest boat and the slowest boats in a fleet. So if you have someone who is clearly a beginner you could allow then a further 10% or so. Remember the bigger the TCF the faster the boat.

As another responder has mentioned the system self-adjusts. I think you need at least 5 races to get the system to start getting close to an accurate figure for the boat in question.

From a quick look at the specifications of the 2 boats in question I would expect 1 would be much quicker than the other, so should have a differing starting ratings…

The RYA should be able to help Andy as they publish a list of

base NHC ratings available as list in spreadsheet format [].
Additionally if a set of appropriate measurements are provided /
available for a class / type of boat not in the published list,
the RYA can calculate a a base rating.

You are not correct in stating that if a particular boat is taken

and put with a different group of boats it will require a new NHC
rating. It will start in the new group with the published or
calculated NHC base rating value. The change in rating from race
to race will be calculated for the boat in the new fleet.

being the NHC is designed to be used in your fleet
with the actual performance of an individual boat in
its current setup and crew against the mean of fleet.
If you take that boat and put it in a different fleet
it will require a new NHC rating. If the boat and
crew perform above their normal they will be ranked
highly in that race and may even win.

The system I

use is to convert the published ratings to a TCF
rating and use that as the starting point. For
example a Laser full rig has VYC of 114 and a Laser
Radial has a VYC of 118.8. this would convert to 0.877
for the full rig and 0.844 for the Radial. I then
use this as a starting rating, as the differing speeds
of the boats has been removed leaving the quality of
the equipment and the crew as the variables.

If there is

published rating on the boats in your fleet, or you
have actual data on the performance of the boats in
question you should be able to to calculate a starting
rating.

It is common

to see a performance difference of 15% to 20% between
the quickest boat and the slowest boats in a fleet.
So if you have someone who is clearly a beginner you
could allow then a further 10% or so. Remember the
bigger the TCF the faster the boat.

As another

responder has mentioned the system self-adjusts. I
think you need at least 5 races to get the system to
start getting close to an accurate figure for the boat
in question.

From a quick

look at the specifications of the 2 boats in question
I would expect 1 would be much quicker than the other,
so should have a differing starting ratings…

The RYA should be able to help Andy as they publish a list of base NHC ratings available as list in spreadsheet format [https://www.rya.org.uk/racing/Pages/nhc.aspx]. Additionally if a set of appropriate measurements are provided / available for a class / type of boat not in the published list, the RYA can calculate a a base rating.

You are not correct in stating that if a particular boat is taken and put with a different group of boats it will require a new NHC rating. It will start in the new group with the published or calculated NHC base rating value. The change in rating from race to race will be calculated for the boat in the new fleet.

Kind regards,

Huw

On 02/10/2018 22:39, ‘JohnL’ jladewig@tpg.com.au [sailwave] wrote:

Hi Andy,

I think RYA will not be able to answer your question.

The reason being the NHC is designed to be used in your fleet with the actual performance of an individual boat in its current setup and crew against the mean of fleet. If you take that boat and put it in a different fleet it will require a new NHC rating. If the boat and crew perform above their normal they will be ranked highly in that race and may even win.

The system I use is to convert the published ratings to a TCF rating and use that as the starting point. For example a Laser full rig has VYC of 114 and a Laser Radial has a VYC of 118.8. this would convert to 0.877 for the full rig and 0.844 for the Radial. I then use this as a starting rating, as the differing speeds of the boats has been removed leaving the quality of the equipment and the crew as the variables.

If there is published rating on the boats in your fleet, or you have actual data on the performance of the boats in question you should be able to to calculate a starting rating.

It is common to see a performance difference of 15% to 20% between the quickest boat and the slowest boats in a fleet. So if you have someone who is clearly a beginner you could allow then a further 10% or so. Remember the bigger the TCF the faster the boat.

As another responder has mentioned the system self-adjusts. I think you need at least 5 races to get the system to start getting close to an accurate figure for the boat in question.

From a quick look at the specifications of the 2 boats in question I would expect 1 would be much quicker than the other, so should have a differing starting ratings…