Seastoke
Well-Known Member
just a thought I don't know
Are most mobo,s around 40ft cat B craft
- Thread starter Seastoke
- Start date
[2068]
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The vast majority are built / certified to RCD Cat B.
A very select few are certified to RCD Cat A
e.g. Nordhavn 40, Seaward 42.
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A very select few are certified to RCD Cat A
e.g. Nordhavn 40, Seaward 42.
.
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MapisM
Well-Known Member
Short answer, yes - and rightly so.
F8 with 4+m breaking waves ain't conditions you would want to afford with ANY 40' mobo, regardless of the certification the builder aimed at - which mostly depend on marketing rather than technical reasons.
The proof of that is for instance the Raffaelli Shamal, a 40' open boat which I wouldn't dream of cruising in anything more than F5 (if that), but the builder managed to have CE-A certified.
F8 with 4+m breaking waves ain't conditions you would want to afford with ANY 40' mobo, regardless of the certification the builder aimed at - which mostly depend on marketing rather than technical reasons.
The proof of that is for instance the Raffaelli Shamal, a 40' open boat which I wouldn't dream of cruising in anything more than F5 (if that), but the builder managed to have CE-A certified.
[2068]
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I can say with some certainty that I will never go out voluntarily in an F8 with 4m waves in my RCD Cat B SC35 either!
BruceK
Well-Known Member
CAT B being F8 and up to 4m swell is a rather arbitrary look at the certification which to my reading has more to do with safety features as well as stability. The coding acknowledges that a 4m wave height is only relevant to what one would expect with an F8 wind in an open body of water without taking into consideration any shelving, overalls etc or wave shape.
IDAMAY
Well-Known Member
Also Trader 42 is Cat A though it is a SD rather than planing hull. I am not aware of any planing boats around the 40 foot mark with Cat A certification.
kashurst
Well-Known Member
curiously my boat has 2 cat B ratings - it is Spanish built , though on the atlantic coast.
for the atlantic its rated cat B for 8 people - sounds OK to me, 38/39 foot twin engines etc.
for med use its rated cat B for 12 people ????? thats 2 more on the foredeck sunpad plus two on the flybridge sunpad
for the atlantic its rated cat B for 8 people - sounds OK to me, 38/39 foot twin engines etc.
for med use its rated cat B for 12 people ????? thats 2 more on the foredeck sunpad plus two on the flybridge sunpad
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[2068]
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MJM 40z ?
MapisM
Well-Known Member
The one I mentioned in my previous post is one example, but I can make others.
The Shamal at least is on shafts, but try googling for Salpa Laver, if you wish to have a laugh.
A 31' open boat on outdrives, bound to have the props spinning in the air upon every other wake, with no traction whatsoever, even in a moderate sea - let alone anything worse. But they managed to get her CE-A certified... :ambivalence:
Mind, not that I'd be happy to be out there in an F8 with breaking waves in excess of 4m with a Trader 42, or even a Nordhavn, for that matter.
The whole idea of making a certification system which could make people believe that they could buy a 40' mobo and be safe in conditions which even 80 feet steel fishing trawlers stay clear of, well, that is almost criminal, 'fiuaskme.
jcwads
Well-Known Member
Interestingly when I was looking for my first boat under 30 ft, I noticed that the Jeanneau Leader 805 was Cat B rated! Now thats a 26ft boat!! 4 metre waves in a boat of that size and an open cockpit, no thankyou...
julians
Well-Known Member
My boat ( windy 25) is also cat b rated, it is a capable boat for the size, but not sure id try it in the conditions that cat b compliance implies.
IDAMAY
Well-Known Member
Totally agree MapisM. I wouldn't want to be out in those conditions in the Trader 54, never mind the 42, but it is nice to know that you have a sporting chance of survival if caught out. I do agree that the application of the certification system is more than a little misleading.
[2068]
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We're all focusing on one aspect of the RCD, which is the upper weather limit of the design category.
"A. OCEAN: Designed for extended voyages where conditions may exceed wind force 8 (Beaufort scale)
and significant wave heights of 4 m and above but excluding abnormal conditions, and vessels largely
self-sufficient."
But back in the real world, you'd be avoiding those conditions like the plague, same as for the category B below.
So, maybe the question should be:
Would you actually want to be out in the Ocean in a Nordhavn 40?
(e.g. The Atlantic).
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"A. OCEAN: Designed for extended voyages where conditions may exceed wind force 8 (Beaufort scale)
and significant wave heights of 4 m and above but excluding abnormal conditions, and vessels largely
self-sufficient."
But back in the real world, you'd be avoiding those conditions like the plague, same as for the category B below.
So, maybe the question should be:
Would you actually want to be out in the Ocean in a Nordhavn 40?
(e.g. The Atlantic).
.
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Irish Rover
Well-Known Member
I had one of these for 7 years. Beam is 2.95M. Very stable boat and excellent sea keeping. I wouldn't intentionally go out in bad weather but I did get caught out in 35Kn on one occasion. I was alone and I got very wet but never felt worried. I had a Larson Cabrio 285 prior to that which, as far as I remember, was also Cat B and you wouldn't feel anyway comfortable in even 15 - 20Kn.
petem
Well-Known Member
New Fairline F-line 34 is Cat C. I doubt it's any less seaworthy than the other boats mentioned so perhaps this is some honesty emerging.
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[2068]
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... or simply that it's more cost effective to certify to the RCD Category that FL think most closely covers the expected usage of these boats, e.g. blasting around the coast in the Med.
BruceK
Well-Known Member
I still think the point has been missed. The RCD is a standard of construction more than a guide to what the boat can handle in terms of sea state.
https://www.google.co.uk/url?sa=t&r...4.ashx?la=en&usg=AOvVaw34P9DQz2LFu5Zw99pLpSSv
https://www.google.co.uk/url?sa=t&r...4.ashx?la=en&usg=AOvVaw34P9DQz2LFu5Zw99pLpSSv
julians
Well-Known Member
Isnt it both a standard of construction AND a guide as to what to boat should be able to handle.
Its certainly misleading in terms of what a boat can handle though imo.
[2068]
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I would say that it's misleading in terms of the upper limit of weather conditions that you would want to experience.
But would a Nordhavn 40 actually sink in 4m waves? Most probably not, unless something untoward happened.
However the crew would be most probably be seasick and pummelled, wishing they were back in the pub, and bits might fall off the boat (e.g. the kitchen).
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BruceK
Well-Known Member
In all the specifications is there a single one that says..... now go out and try it in a F8 with 4m waves in a proving sea trial? No, it is a design and construction standard that then translates to a theoretical condition.