Reply
 
Thread Tools Search this Thread
 
Old 20 August 2006, 17:09   #31
Member
 
Country: UK - England
Town: Southampton
Boat name: SMH Rib / War Shot
Make: Ribtec / Scorpion
Length: 4m +
Engine: 10hp Yam / 150hp opt
Join Date: Sep 2003
Posts: 1,894
RIBase
Quote:
Originally Posted by quinquarimarine
It is interesting to note that Coding requires a minimum of 250mm transom height and as such can be seen to cause captivation of water. If you want a truly self draining RIB for a particular activity then the Ocean Dynamics with inboard will come to the fore.

Cheers

John
www.quinquari.co.uk
Hi John,

You're not strictly correct there. To clarify for others reading Coding requires 250mm FREEBOARD at the transom.
If you build the deck up to the top of a transom that gives 250mm freeboard then you won't trap water in the boat.
Most of the larger Halmatic RIBs do it this way.

Pacific 22 has a transom that extends about 100mm above the deck and still meets the freeboard requirement.

I do agree that whilst having a nice high transom keeps your engines away from the water and helps prevent water getting into the boat it does mean that when you are swamped there is LOTS of water in the boat.
__________________

__________________
Searider is offline   Reply With Quote
Old 20 August 2006, 18:54   #32
Member
 
Country: UK - Scotland
Make: HumberOceanOffshore
Length: 8m +
Engine: Volvo KAD300/DPX
Join Date: Oct 2002
Posts: 4,962
Give us a definition of freeboard. Duncan, from your comments, it sounds as though freeboard is the height above the outside water level. Is this correct?
__________________

__________________
JW.
jwalker is offline   Reply With Quote
Old 20 August 2006, 19:41   #33
Member
 
Country: UK - Wales
Town: St Davids
Boat name: 6 vessels -various
Make: Quinquari/Humber
Length: 10m +
Engine: Twin ETEC200s
Join Date: Nov 2003
Posts: 130
You're not strictly correct there. To clarify for others reading Coding requires 250mm FREEBOARD at the transom.
If you build the deck up to the top of a transom that gives 250mm freeboard then you won't trap water in the boat.
Most of the larger Halmatic RIBs do it this way.


Duncan, a fair point and maybe I was being a bit too general.

Freeboard will be taken from WL to the top of the transom (at its lowest point). Of course if fitting outboards transom height will be dictated by shaft length/cavitaion plate etc. All of this will relate to how the vessel sits in the water ie. prismatic and block coeficients of the hull form. This in turn will dictate performance, fuel etc.... a long debate for another day !

If as you suggest you build the deck at the 250mm level then there can be issues with MCG/stability especialy when you have vessels with careful and fine lines. A Pacific has more displacement and less fine lines enabling a higher deck line.

If transom height is too low for coding then a second internal transom could be built( note some of the Deltas and Avons). This in many ways works well but still creates the captivation of water. Also noting your point that it is better to keep the engine as high as possible for obvious water related issues.


No such thing as a perfect boat !!

Cheers

John
www.quinquari.co.uk
__________________
quinquarimarine is offline   Reply With Quote
Old 21 August 2006, 12:27   #34
Member
 
Country: UK - England
Town: Southampton
Boat name: SMH Rib / War Shot
Make: Ribtec / Scorpion
Length: 4m +
Engine: 10hp Yam / 150hp opt
Join Date: Sep 2003
Posts: 1,894
RIBase
Quote:
Originally Posted by jwalker
Give us a definition of freeboard. Duncan, from your comments, it sounds as though freeboard is the height above the outside water level. Is this correct?
Got it in one - and John has replied to the same effect.

It's a strange paradox that a boat with a lowish transom - that only just passes the 250mm freeboard stipulation has much less of a problem coping with the swamp test. - there will only be a few hundred mm in the stern before it pours out.

A boat with a high built in splash well - such as newer Scorpions, Cobras, Ribeyes etc have to have so much water in them before they can be truly described as swamped. - Up to your knees almost!
__________________
Searider is offline   Reply With Quote
Old 23 October 2006, 10:15   #35
Member
 
Country: UK - England
Town: Lee on the Solent
Boat name: Saintlee
Make: Leeway
Length: 6m +
Engine: Evinrude DI 115
Join Date: Jul 2006
Posts: 325
Seeing the TV pages and listings for this week this event (or the visit to Goodwin Sands at least) is featured on TV this week, something like Coast?!

I have got extremely irritated by some of the press releases that have been circulating for the programme leading up to it which make a real deal about "the forces of nature" and other such tosh. But of course they're hardly going to say "we nearly killed ourselves, our crew and our charterer" are they!
__________________
Lostboy is offline   Reply With Quote
Old 23 October 2006, 11:48   #36
Member
 
Country: UK - Wales
Town: swansea
Boat name: Too Blue
Make: BLANK
Length: 8m +
Engine: Suzuki DT225
Join Date: Mar 2004
Posts: 12,791
Is there any footage of the incident itself - by watching such things it can teach you valuable lessons - like having nothing to do with film crews!!!
__________________
codprawn is offline   Reply With Quote
Old 23 October 2006, 11:59   #37
Member
 
Country: UK - England
Town: Farnborough
Boat name: Eleven
Make: Arrow
Length: 8m +
Engine: 557cu, 700hp
Join Date: Jul 2003
Posts: 1,255
That's crap coddders. There's lots of good film crews. I spent 5 days working with a German crew recently - and they were an absolute pleasure to work with.
__________________
Matt is offline   Reply With Quote
Old 23 October 2006, 12:50   #38
Member
 
Cookee's Avatar
 
Country: UK - England
Town: Salcombe, Devon, UK
Boat name: BananaShark
Make: BananaShark
Length: 10m +
Engine: 2xYanmar 260 diesels
Join Date: Mar 2003
Posts: 4,225
Likewise - been working in the industry since '96 and never had a problem - having said that there is always the exception that proves the rule, and it seems that this the is the exception - not the rule!
__________________
Cookee
Originally Posted by Zippy
When a boat looks that good who needs tubes!!!
Cookee is offline   Reply With Quote
Old 23 October 2006, 14:35   #39
Member
 
Country: UK - Wales
Town: swansea
Boat name: Too Blue
Make: BLANK
Length: 8m +
Engine: Suzuki DT225
Join Date: Mar 2004
Posts: 12,791
Quote:
Originally Posted by MadMat View Post
That's crap coddders. There's lots of good film crews. I spent 5 days working with a German crew recently - and they were an absolute pleasure to work with.
Err it WAS a joke..................................
__________________
codprawn is offline   Reply With Quote
Old 23 October 2006, 17:40   #40
Member
 
Country: UK - England
Town: Peak District
Boat name: Plastique
Make: PRO Sport
Length: 6m +
Engine: Suzuki DF115 4st.
MMSI: 235015228
Join Date: Aug 2004
Posts: 109
Send a message via Yahoo to ScottyDog
Directors always want to do more than the circumstances/light/hosts/crew/fees etc. will allow. Easiest surefire way to deal with it is to inform the producer the insurance cover is no longer effective (as is the case when the plan & risk assessment is not adhered to), they always panic and get the director & crew to pack up straight away. I have to resort to this almost every day, usually with regard to safety distances, stunts, health & safety etc. as it is in nobody's interest to allow them to push the boundaries.
__________________

__________________
ScottyDog is offline   Reply With Quote
Reply

Thread Tools Search this Thread
Search this Thread:

Advanced Search

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are Off
Pingbacks are Off
Refbacks are Off





Copyright 2002- Social Knowledge, LLC All Rights Reserved.

All times are GMT -5. The time now is 08:29.


Powered by vBulletin® Version 3.8.8 Beta 1
Copyright ©2000 - 2017, vBulletin Solutions, Inc.