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Robin

Member Since 10 Feb 2004
Offline Last Active Yesterday, 10:06 PM
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Posts I've Made

In Topic: J-111 Abandoned returning to NZ from Fiji. Crew rescued.

16 July 2014 - 10:28 PM

I am not suggesting that the causes are the same but you only need to read the original RORC inquiry and summary with respect to the 1979 fastnet and the book--Fastnet Force 10 to understand how critical the breaking of any part to the steering gear is. At that time it was early in the use of carbon rudder stocks that proved to be under engineered. It is also clear how difficult it is do actually create and install alternated steering in really rough weather. In my view, based on the limited information that I have the delivery skipper and crew did the right thing to deploy the life raft.<br /><br />Robin

In Topic: Need help with a proper explanation... Boat speed vs. GPS speed

14 July 2014 - 09:40 PM

There are so many uses for both GPS information and properly calibrated boat speed, those you have mentioned and others. To the extent that your team does not understand the uses of a good VPP polar they are going to hold back your entire team's performance. Rather than try and summarize the advances of the last 30 years of sail have your Owner/skipper buy and read and then share with the team the excellent new book Modern Race Navigation: Expedition Software in Action by Oxley. Unfortunately available only on a Kindle from Amazon. But just one item is enough to need both. GPS, no matter how quickly it is updated can not provide real short term performance. Accurate boatspeed is required for the calculation of all of the other functions--AWS<AWA<TWS<TWA<TWD etc that are of value on the race course.

Robin

In Topic: Beneteau 40.7 Cheeki Rafiki missing Mid-Atlantic

20 June 2014 - 03:24 PM

During the winter of 1999/2000 a number of us on the Great Lakes were exploring the possible choices for a local one design fleet and there were a lot of contenders including both the 40.7 and the Sydney 38. It turned out that both happened. It is a world wide market. The 40.7 is on the cruise side of racer/cruiser and the 38 is more on race side but for the purposes of looking at construction, build, safety margins, experience I submit they are in the same general world. Neither is a custom one off. Each had heritage from a more racing design. Each was intended to be a series build for owners that wanted a performance hull. Each was intended to provide value for the "dollar." I chose the 38 but have substantial experience on 40.7s. As to price one has to remember that this is very dependent on the fluctuations of currency values. When we were first exploring the issue the Euro did not exist as an actual currency and the Aus dollar was at approximately .6 to the US dollar. Conditions that are very different today.

Robin

Sydney 38. First hulls delivered in 2000.

 
No Sydney 38 is not close to a 40.7. Just look at displacement and interior fitting.
 
Maybe the Sydney 39CR. But as an Australian boat, it not exactly available on Euro market.
 
PS: Seems that the preliminary pricing for Sydney GTS 37, apparently locally built in Croatia by Salona, not imported from Australia, is higher than the price of new First 40 PLUS a new First 35.

In Topic: Beneteau 40.7 Cheeki Rafiki missing Mid-Atlantic

20 June 2014 - 02:36 PM

Sydney 38. First hulls delivered in 2000.

If the keelboats are problematic, how do you replace them when they are cast into the keel?
 
If another contributing factor to this keel failure was laminate fatigue and the peeling detachment of the grid liner, how do you tell if this is starting to occur?
 
Moonduster says it's a maintenance issue but if the above become issues from normal but hard use including occasional grounding, how do you `maintain' the keelboats or structural grid liner without expensive and major surgery?
 
It amounts to rebuilding the boat.

 

Yes.
After they have reached the end their service life, they need to be rebuilt. It is not way different from aircrafts.
 
The only issue is : What is the service life of a budget boat ? What kind of maintenance is expected ?

 
 
So a `budget boat' promoted for ocean racing and passage necessitates a very expensive maintenance budget for a short service life?

 
rewriting of my idea :
 
So a `budget boat' promoted for ocean racing and passage used extensively necessitates a more expensive maintenance budget or will face a shorter service life than a more expensive sailboat, similar size, sold for the same program.
 
I am trying to find close competitors (in lenght, beam, draft, displacement, program) , sold new around that time. I have found Arcona 400, Dehler 39SQ, Grand Soleil 40, IMX 40. I have hard time to find historical new prices, but it seems that First 40.7 was the cheapest. And by a wide margin, compared to some.

In Topic: Beneteau 40.7 Cheeki Rafiki missing Mid-Atlantic

18 June 2014 - 06:28 PM

If anyone thinks that early series produced GRP boats did not have structural issues and keel failures, they are either too young, or have made no effort to get information.
 
In UK there are a host of known issues with 1960s and 1970s, and even 1980s Westerly, MacWester, Sadler, Moody and other brands. Plenty of keels, skegs and rudders have fallen off. Loads of issues with keel support structures. Bulkhead and chainplate attachment failures.
 
The same is true for France and the USA, so let us not dream of "the good old days". The majority of production boats built today are structurally sounder than their forebears.
 
We MUST learn from every significant failure and improve. I believe that, in the main, that is what has been happening.

 
This needs reiterating. Boats now are better than they have ever been by a humongous margin.
Surely the boats are "better" but I am not sure about safer. My Sydney 38 is certainly built to an offshore standard that the 40.7 is not. But my Cal3-30 was built in an era when safe margins were more important than light weight. During the era of transition from metal and wood to fiberglass (not carbon or Kevlar) most of the boats of the mid 60s to mid 70s were overbuilt. My 3-30 was over 12,500 dry. Had a typical Lapworth designed trapezoidal keel derived from the Cal 40 and it was nearly all lead.

Robin