Reply
 
Thread Tools Search this Thread
 
Old 29 November 2011, 13:10   #1
Member
 
Country: UK - Channel Islands
Town: Jersey
Boat name: Jersey Seafaris
Make: Humber
Length: 8m +
Engine: 2 x 200hp evinrude
Join Date: Jun 2011
Posts: 10
Liferaft on top of A frame?!

I have been thinking about putting my 14 man liferaft on top of my A frame on a 8.5 meter Humber rib.

It is early days and just a thought at the moment, the idea was freeing up some space for further seating/storage. At the moment the liferaft is just in front of a centre console. The liferaft is just as accessible if mounted on top of the A frame.

Has anyone tried this or seen this done before, some advice on the matter would be great!

Rich
__________________

__________________
riccardo is offline   Reply With Quote
Old 29 November 2011, 13:25   #2
RIBnet supporter
 
C2 RIBS's Avatar
 
Country: UK - England
Town: Hants
Boat name: Gemineye
Make: Ribeye S850 charter
Length: 8m +
Engine: 300hp
MMSI: 235097445
Join Date: Sep 2007
Posts: 3,029
Hi we reviewed this position hanging beneath the top rail of the AFRame on an 8 metre but the overal consensus was the weight issue of a twelve man liferaft some 45kilos up high would change the balance of the RIB. We have seen numerous fittings with liferafts either side of the base of the A FRame just above the tube . Again a wet area and a lot of weight on the stern. I did fit a 6 man to the rear by the wash well area and even this proved to heavy and we had it moved by Biffer on the cradle to the bow area to gain balance back.

I would be looking at the manufacturer to give you weight figures for any loadings. We have found the best place for most of our liferafts to be forward of the consul helm position as all passengers are alongside and to the rear. I guess with a large rear helm the raft might have a good balance if all passengers are ahead of the consul position.
__________________
Ian
Rib charter and Rib hire with www.c2ribs.co.uk
C2 RIBS is offline   Reply With Quote
Old 29 November 2011, 13:42   #3
RIBnet admin team
 
willk's Avatar
 
Country: Ireland
Make: Redbay Boats
Length: 9m +
Engine: 370hp
Join Date: Feb 2008
Posts: 12,927
RIBase
Dr. Doof put his RADAR dome (5kg?) on his Humber A frame. The frame began to flex badly and it cracked.
__________________
willk is offline   Reply With Quote
Old 29 November 2011, 14:26   #4
RIBnet admin team
 
Poly's Avatar
 
Country: UK - Scotland
Boat name: imposter
Make: FunYak
Length: 3m +
Engine: 2 stroke YAM 20 HP
MMSI: 235089819
Join Date: Sep 2005
Posts: 10,114
Google suggests a 14-man liferaft in a canister might weigh 60kg, so even assuming you have the a frame engineered to take that (and the resulting leverage) and the boat balance is fine with it - could you actually deploy it in the sort of seas where a liferaft might be your preferred option? - its sounds hard enough to lift 60 kg at head height never mind when being thrown around in rough seas. The only time I can really imagine stepping off a RIB onto a liferaft being a no brainer is if it is on fire. That's most likely to involve the engine(s) in which case the a-frame really doesn't sound like the ideal spot for it.
__________________
Poly is offline   Reply With Quote
Old 29 November 2011, 15:11   #5
Member
 
Country: UK - Channel Islands
Town: Jersey
Boat name: Jersey Seafaris
Make: Humber
Length: 8m +
Engine: 2 x 200hp evinrude
Join Date: Jun 2011
Posts: 10
Thanks for your response people.

Balancing of the boat were my initial worries. The Aframe will be made to accomodate the liferaft if put there. But the point of when using a raft in a rib from Polwart is a good one!
I'm swaying on somewhere else to put the liferaft!
Thanks
__________________
riccardo is offline   Reply With Quote
Old 29 November 2011, 16:47   #6
Member
 
Country: UK - England
Town: Sussex
Boat name: Aintree
Make: Redbay Stormforce
Length: 7m +
Engine: Twin 150's
Join Date: Jun 2009
Posts: 255
I agree. Most a frames struggle with a radar on it in rough conditions. I think a 14 man liferaft would only last a few big landings.
__________________
redthunder is offline   Reply With Quote
Old 30 November 2011, 05:20   #7
Trade member
 
Andre's Avatar
 
Country: UK - England
Town: West Sussex
Boat name: Grey Mist
Make: Parker 800 Baltic
Length: 8m +
Engine: 2xMercury Diesel 170
Join Date: Oct 2002
Posts: 3,457
RIBase
Send a message via Skype™ to Andre
Liferafts should be stored away from the passengers but in an easy accessible place should there ever be a need to deploy them in anger. We found that it is best to have 2 x 8 man packed in flat GRP containers. Here you may have an extra service bill but an 8 man will be much easier to handle then a 14 man especially for a single person. We fitted such arrangement on SeaSafari 1 and even with this extra weight on the stern it made no difference to the performance of the rib.
Looking at the attached photo you can see that even with 14 persons on board and the two 8 man liferafts the tubes still do not touch the surface of the water.

The photo of the yellow rib (a Parker 1000 Baltic) shows a similar arrangement
Attached Thumbnails
Click image for larger version

Name:	SeaSafari 036 (Large).jpg
Views:	226
Size:	63.6 KB
ID:	64167   Click image for larger version

Name:	IMG_0779.jpg
Views:	183
Size:	57.3 KB
ID:	64168  
Andre is offline   Reply With Quote
Old 30 November 2011, 08:51   #8
Member
 
Country: Other
Town: Rosas
Boat name: Conqueror
Make: Valiant
Length: 7m +
Engine: Outboard 150hp Merc
Join Date: Dec 2010
Posts: 541
Send a message via Skype™ to Courageous
You get a degree of redundancy with 2 8 man rafts as well of course.
__________________
Courageous is offline   Reply With Quote
Old 05 December 2011, 14:53   #9
Member
 
chewy's Avatar
 
Country: UK - England
Town: Up Norf
Make: Avon SR4,Tremlett 23
Length: 4m +
Engine: Yam 55, Volvo 200
Join Date: Apr 2007
Posts: 5,217
Quote:
Originally Posted by willk View Post
Dr. Doof put his RADAR dome (5kg?) on his Humber A frame. The frame began to flex badly and it cracked.
I thought them Humber A frames vibrated more than an Ann Summers party full of middle aged women anyway..... and then self destruct.
__________________
chewy is offline   Reply With Quote
Old 05 December 2011, 16:06   #10
Member
 
Country: UK - England
Town: Nr Faversham, Kent
Boat name: C Rider
Make: Avon
Length: 5m +
Engine: Yam 80
Join Date: Jan 2005
Posts: 479
Quote:
Originally Posted by chewy View Post
vibrated more than an Ann Summers party full of middle aged women anyway..... and then self destruct.
Is that not called a crisis?
__________________

__________________
Searider - The Best 5.4 x Far
Swifty 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 14:58.


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