Scillonian in trouble?

[chanelyacht]

yes, this was exactly my point. The requirements the RNLI had at the time could not be met by water jets. I agree that on a per HP basis a waterjet will have a lower bollard pull than props. However, this is balanced by the higher speed ability. I assume RNLI would have had requirements for both pulling and high speed, more biased towards the towing aspect (and other factors no doubt).

I remember that rescue, the coxswain got a bronze medal if I remember rightly. The same crew that were on the BBC documentary, might even have been around the same time.

Yes, it was the legendary Frank Smith and Central TV were filming at the time.

The RNLI know the Shannon won't have the same pull as the Tamar or Severn - which is why you won't ever find a jet station flanked by another jet.

I've cox'd both twin jet and twin prop boats, both excellent for their jobs but different beasts.

 

[PhilW]

As far as I'm aware there are no plans to phase the Severn out. Last I heard they had been given given a hull life of 50 yrs with a midlife refit/upgrade at 25(ish) yrs ours is going for pre refit survey next month might slip the surveyor a bag of jelly tots to see if we can get the silver engines as some times 3250hp is better than 2500hp ��

 

[RalphyM]

As far as I'm aware there are no plans to phase the Severn out. Last I heard they had been given given a hull life of 50 yrs with a midlife refit/upgrade at 25(ish) yrs ours is going for pre refit survey next month might slip the surveyor a bag of jelly tots to see if we can get the silver engines as some times 3250hp is better than 2500hp ��

I didn't know that interesting thanks. Seems like the 1.7M ish purchase price was pretty good value for a 50 year lifespan!

 

[dogleg]

Well the UK used to have a salvage tug in those waters but no longer. The French had to take over the responsibility. 22000hp worth.

Apparently though the Severns are being phased out and so in the future they will only have the 2000hp Tamar. However it needs 2000hp to drive it as fast but not as far as the bigger 1300hp French AWB...:triumphant:

the Severn is not being phased out, it will in time be upgraded completely with new electronics etc once the MTU programme is complete, lifespan of hulls vary according to who you speak to but 35-40+ years is commonly mentioned, modernisation programme goes by the acronym SLEEP I am told

 

[dogleg]

The problem with jets on small craft is you can't get the same "bite" for towage, so you have a lower bollard pull. Jets are great for fast, shallow water work (hence the RNLI using them since they started operating on the Thames years ago), as long as you're prepared for the maintenance costs in silty areas.

So you get a very fast, very capable craft (like the 10m Halmatics with Castoldi jets for example) but you wouldn't be able to tow, or hold off, a much bigger craft for very long. The old Salcombe Tyne class for example held a 1200GRT vessel (the Janet C, 40 times larger than the lifeboat) in force 9 winds off a lee shore for around 6 hours. You just wouldn't do that with jets on a 47ft vessel.

Some years ago in Holland I spoke to a Dutch coxswain who agreed that his olsd prop boat towed better in heavy weather than his new 19meter jet boat

 

[Poecheng]

The old Salcombe Tyne class for example held a 1200GRT vessel (the Janet C, 40 times larger than the lifeboat) in force 9 winds off a lee shore for around 6 hours. You just wouldn't do that with jets on a 47ft vessel.

Not as well known is that rescue was only possible because, at the other end of the Janet C, the French were pushing the stern in a Tinker Tramp with a Yamaha Malta at about half-revs:encouragement:

 

[Sybarite]

It's a pity the SNSM don't look after their boats as well as the RNLI .... some very scruffy examples on our stretch of coast ... I'm sure they do a good job but seeing sparkling RNLI boats does instil a little confidence.

Funny they have a 30 year service life; the RNLI : 25 years (as per their site).

 

[Sybarite]

yes, this was exactly my point. The requirements the RNLI had at the time could not be met by water jets. I agree that on a per HP basis a waterjet will have a lower bollard pull than props. However, this is balanced by the higher speed ability. I assume RNLI would have had requirements for both pulling and high speed, more biased towards the towing aspect (and other factors no doubt).

I remember that rescue, the coxswain got a bronze medal if I remember rightly. The same crew that were on the BBC documentary, might even have been around the same time.

The builders in France offer both the prop version or the jet version of the new ORC class of lifeboats. Jets for example were sold to Belgium where the boats have to operate in shallow waters.

I saw that the new French AWB 17.8m uses the same Scania 600hp engines as the 13.6m Shannon. So that won't explain the price difference but they do push the larger AWB at the same speed: 25knts. Hull design?

 

[fisherman]

I heard the Mayday relay, made my heart stop for a moment. Correct procedure and swift response from just about everyone, throw in a bit of fog, a bigger hole, slightly different location, etc etc, and full complement of 72 she is allowed, could have been a more trying result. I believe those trip boats carry liferafts these days. See here:
https://www.google.co.uk/search?q=i...MAhWmBcAKHbXODJ8Q7AkIKA#imgrc=AnR5eakld4ykpM:

 

[dogleg]

Funny they have a 30 year service life; the RNLI : 25 years (as per their site).

the website info is wrong, when introduced the Severns were given the usual 25 year life span but that is no longer the case. There are NO plans to withdraw or phase out Severns. SLEEP will extend their life.

 

[KINGFISHER 9]

Funny they have a 30 year service life; the RNLI : 25 years (as per their site).

Sorry you didn't understand my post.

 

[dogleg]

The builders in France offer both the prop version or the jet version of the new ORC class of lifeboats. Jets for example were sold to Belgium where the boats have to operate in shallow waters.

I saw that the new French AWB 17.8m uses the same Scania 600hp engines as the 13.6m Shannon. So that won't explain the price difference but they do push the larger AWB at the same speed: 25knts. Hull design?

what is the hull material of these new French boats?

 

[Sybarite]

what is the hull material of these new French boats?

Composite.

"Réalisés par Sibiril Technologies sur des plans du bureau d'architecte Pantocarene de Didier Marchand, les CTT NG adoptent le design ORC 178.R. Dotés d’une coque en composite verre résine, ils mesureront 17.8 mètres de long pour 5.2 mètres de large, avec un tirant d’eau d’1.62 mètre. Affichant un déplacement de 29 tonnes en charge, les futurs canots tout temps pourront atteindre la vitesse de 25 nœuds grâce à deux moteurs de 650 cv. Armés par un équipage de 8 sauveteurs, ils offriront plus d’espace que leurs aînés pour l’accueil des naufragés. Ainsi, les CTT NG pourront accueillir jusqu’à 40 personnes, avec 15 places assises et la possibilité de loger deux civières."

Sibiril (the builder)

It's also much heavier than the Shannon : 29 tonnes, Shannon 17.

 

[Sybarite]

Sorry you didn't understand my post.

I presumed that you were not focusing on a simple lick of paint but were implying that they were less well maintained.

 

[fisherman]

Ouch, now there is to be an investigation into the 'grounding'. Not good for business.