Could be a problem, exactly which 30' Holland is it? Ron Holland has about eight 30 footers listed on www.sailboatdata.com

So basically this is a plug for your business I guess

It wouldn't be the;

Rush 31;
Fast 303;
Nich 1/2 ton
Nich 303;
Cal

They were all developments of the "Golden Jubilee" style which had a wider stern and were developed after Ron drew the famous 40 footer "Imp" with a similar stern. This was a 1977-78 or later set of designs.

The Australian Holland 30 was originally built by Doug Sharpin of Yachting World in Melbourne; yours is the "Club" version with the larger cabin top which came out around 1980, I think. The Australian Holland 30 was a Golden Shamrock/Silver Shamrock style design, 1975 or 1976 vintage, which had a narrower stern than the slightly later designs I listed above. That could narrow the rig dimensions down.

I'm not sure whether the Australian Holland 30s were Golden Shamrocks (the original design) or Silver Shamrocks which were basically the same boat but with more displacement and a bigger rig. Just to make things more confusing, the 1976 world half ton championship was won by Silver Shamrock (the individual boat, not the design type) which IIRC was a modified Golden Shamrock.

However, why bother about the sizes that Holland drew up in 1976, for a racing version of your boat? He would have drawn the big headsails to the 150% overlap of the IOR rule (which is not a problem for you) and the smaller headsails would have been designed around the size and aspect ratio required by mid '70s cross-cut dacron technology, which you aren't restricted to.

I seem to recall that the world title winning Silver Shamrock had quite a high clew on the No 1 and used barber haulers, which you probably won't use. That may underline why the use of the old dimensions may be irrelevant.

Ramona said..
Just to add to Chris's excellent response above, if your going to have new sails cut you are going to have to measure yourself or have your sailmaker measure.
If your just after usable headsails for club racing or cruising then you will be far better of going for a furling headsail about number 2 size in a modern cloth and design. The headsails on racing Holland 30's, especially No 1's will be way too large and useable in limited wind ranges. I have several racing headsails on my Currawong that will probably not see the light of day again. It's a shame because they are just beautiful sails! What I did was measure my No2 headsail and sent the dimensions to Bull sails in Victoria. Tony Bull then designed a furling headsail and had the sail built in China. Check out his webpage.

Thanks for the help guys & in reply to some comments, No this is not a plug, I tried to put a pic of the yacht on this forum but couldn't work out how to so included the web address so the images could be viewed.
I have been sailing for 48 yrs so well versed in types of cloths & yes I know a no. 1 would be too big for most conditions so I had a 125% furling genoa cut with foam insert in the luff to reduce fullness when partialy reefed.
The reason I am trying to find out the correct size for a no.1 is, each year I enter 'Guava' in the Adel - Lincoln yacht race & have suffered in light winds & just off the breeze so a ghoster would be great.
But don't want the comment "Great race mate but I think your sails are oversize" & protest me.
Just thought there would be a sail maker with a set of sail plans for a 1984 Holland 30 (yes, built in Frangston Vic.) It was also a Whitsundays rent a yacht, I bought her 10 years ago & have replaced the main & foresail.
Thanks again I'll keep looking.
I guess I could stick with the info on 'loose screw' who had 20.35 sq. mt foresail.

adelaidesailing said..

Ramona said..
Just to add to Chris's excellent response above, if your going to have new sails cut you are going to have to measure yourself or have your sailmaker measure.
If your just after usable headsails for club racing or cruising then you will be far better of going for a furling headsail about number 2 size in a modern cloth and design. The headsails on racing Holland 30's, especially No 1's will be way too large and useable in limited wind ranges. I have several racing headsails on my Currawong that will probably not see the light of day again. It's a shame because they are just beautiful sails! What I did was measure my No2 headsail and sent the dimensions to Bull sails in Victoria. Tony Bull then designed a furling headsail and had the sail built in China. Check out his webpage.

The reason I am trying to find out the correct size for a no.1 is, each year I enter 'Guava' in the Adel - Lincoln yacht race & have suffered in light winds & just off the breeze so a ghoster would be great.
But don't want the comment "Great race mate but I think your sails are oversize" & protest me.

Well in that case it's simple - the IOR rule your boat was designed to assumed that the No 1 had a 150% LPG and (apart from a very small number of boats in the northern hemisphere) all boats followed that default.

IOR boats were often modified, and the forestay attachment point on Holland 30s of various types does not appear to always be in the same position, therefore taking generic measurements off the web would be less accurate than just measuring your own boat and using that as the basis for the headsail size.