Reply
 
Thread Tools Search this Thread
 
Old 04 September 2006, 16:22   #11
Member
 
Country: UK - England
Town: Farnborough
Boat name: Eleven
Make: Arrow
Length: 8m +
Engine: 557cu, 700hp
Join Date: Jul 2003
Posts: 1,255
Suspect they're catching a bit of spray, rather than running in/through the water, whereas that redbay posted further up is running massively wet.
__________________

__________________
Matt is offline   Reply With Quote
Old 04 September 2006, 16:31   #12
Member
 
Country: UK - Wales
Town: Milford Haven
Boat name: Various
Make: Commercial
Length: 10m +
Engine: Screw / Voith / Jets
Join Date: Sep 2002
Posts: 791
Send a message via MSN to Alex Brown
I am baffled as to why people need tubes, or what their purpose is if they don't touch the water at all (even at rest)

My tubes are well into the water when at rest which gives plenty of stability when it's nice and choppy. They do just touch the water at speed, but only right at the stern - as long as the tubes are pumped up to the required pressure, they're pretty solid, when slightly down, they make a slight drumming noise, and there is drag giving about 2knots reduction in speed.

For safety boat work, the little Avon 4m's with filling hull, and the baby Humbers at the yacht club are great - always resting solid in the water, which makes working with dinghies very easy without any rocking from side to side.

-Alex
__________________

__________________
Flickr Photos
Youtube Videos
Alex Brown is offline   Reply With Quote
Old 05 September 2006, 03:42   #13
Member
 
Country: UK - Scotland
Town: Inverkip
Make: Redbay 11m Cabin
Length: 10m +
Engine: 2 x Yamaha422Sti 275
Join Date: Feb 2003
Posts: 567
Quote:
Originally Posted by houser
This picture seems to show tubes more than touching under way...no?
http://www.redbayboats.com/images/sf...e/DSCN5936.jpg
I would think that picture has been taken from the end of the pier as the boat is comming off the plane. My toobs are much the same as Codders
Andy
__________________
Hard or Soft it's never BIG enough
Andy Gee is offline   Reply With Quote
Old 05 September 2006, 03:53   #14
Member
 
Country: UK - England
Town: Poole
Length: no boat
Join Date: Jul 2001
Posts: 673
Quote:
Originally Posted by Alex Brown
I am baffled as to why people need tubes.

-Alex
Interesting comment for a RIB site.

I think its so we, well not me any more, can
1) Dress up in dry suits
2) Carry EPIRB's
3) Eat Kendal Mint cake
4) Wear helmets
Cheers

Mark
__________________
MarkWildey is offline   Reply With Quote
Old 05 September 2006, 04:01   #15
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
My understanding (which is a. limited and b. mirrored by a few on here) is that tubes should provide stability at rest and little or no drag, meaning they run clear, at speed. Mine do that nicely!
__________________
Lostboy is offline   Reply With Quote
Old 05 September 2006, 04:09   #16
Member
 
Country: UK - England
Town: Over here
Boat name: S.S. Nobstick
Make: Three Wise Monkeys
Length: 3m +
Engine: 44lbs of thrust....
Join Date: Nov 2003
Posts: 2,115
Quote:
Originally Posted by MarkWildey
Interesting comment for a RIB site.

I think its so we, well not me any more, can
1) Dress up in dry suits
2) Carry EPIRB's
3) Eat Kendal Mint cake
4) Wear helmets
Cheers

Mark
Now, now Mr Wildey. You know that being a recent convert to the "Jonny Fuller" school of hardboats, the Guru covers the topic much more thoroughly than your feeble attempt at "Mickey taking". Where are the references to a) Camo Paint b) Bowie Knives and c) Parking bumpers? I am going to have to have harsh words with the Master if his disciples are going to show such weak understanding of the value of a good dig at blow-up boating, given such a golden opportunity...
__________________
Jono is offline   Reply With Quote
Old 05 September 2006, 05:36   #17
Member
 
Country: Sweden
Town: Stockholm
Boat name: Sea Dachshound
Make: ..shopping for a RIB
Length: 5m +
Engine: Merc 90 4-stroke
MMSI: 265585460
Join Date: Jul 2003
Posts: 88
That is possible, but all the pictures on the Redbay site I see indicate at least
that the tubes are touching the water at the stern. But I guess they could be very close...
This one shows how deep in the tubes are at rest.
http://www.redbayboats.com/images/sf...0/DSCN5790.jpg
and this one:
http://www.redbayboats.com/images/sf...0/DSCN5803.jpg
that tye are at least close, and should at least touch the waves as they go thru.
In fact all th epictures here:
http://www.redbayboats.com/news/newbuilds/redbay10.htm
Indicate the same. (love that boat BTW)

I guess I wonder if the Redbay people are using the tubes to create a slightly more comfortable ride, by using the tubes and sacrificing some drag...and was hoping some Redbay owners here could comment?

TIA and regards
Janne A.

Quote:
Originally Posted by Andy Gee
I would think that picture has been taken from the end of the pier as the boat is comming off the plane. My toobs are much the same as Codders
Andy
__________________
houser is offline   Reply With Quote
Old 05 September 2006, 12:54   #18
Member
 
Country: UK - England
Town: Liverpool
Length: 10m +
Join Date: Feb 2006
Posts: 234
The RNLI's Atlantic 75's toobes seem to angle upward at the transom, to the stern.
Attached Thumbnails
Click image for larger version

Name:	atlantic 75.jpg
Views:	167
Size:	74.4 KB
ID:	21974  
__________________
Endeavour is offline   Reply With Quote
Old 05 September 2006, 13:45   #19
DM
RIBnet supporter
 
Country: UK - England
Boat name: Little Wing
Make: Searider 5.4
Length: 5m +
Engine: Tohatsu 90
Join Date: Aug 2002
Posts: 1,067
Quote:
Originally Posted by Alex Brown
I am baffled as to why people need tubes, or what their purpose is if they don't touch the water at all
Err..... it's called buoyancy. Lots of it. Lots and lots of it. In fact, so much, that even if you fill your rib with water, it will still function adequately whereas the average hardboater will be behaving like a demented budgie making strange flapping motions with his arms.

I've been thinking about having a whip round for the recent forum hardboat converts. We need to buy them a mirror, a bell and a nice piece of cuttlebone.

DM
DM is offline   Reply With Quote
Old 05 September 2006, 13:49   #20
JIY
Member
 
Country: UK - Scotland
Town: Largs
Boat name: Spitfire
Make: XS850
Length: 8m +
Engine: 2 x 200 Verado
MMSI: 235905304
Join Date: May 2004
Posts: 174
My experience with the various RIB types I've driven regularly (6.8 Ribcraft, 7.5 Tornado, 8.5 Tornado, 10m Humber and 11m cabin Redbay) leads me to believe that having the tubes touching the water at rest is important, so that the boat remains stable at rest when people are embarking, disembarking and generally moving around the boat. On my 7.5 Tornado with outboard the tubes were clear of the water at rest, which was be a real pain when crewmembers moved around when coming alongside. At times the resultant list and steering effect made for a less than rewarding arrival!

At speed, the hull shape is certainly the important factor in achieving stability, but the tubes still provide dampening and roll limitation during rougher sea crossings, even if they are clear of the water. The drawback of tubes touching the water, other than drag, is that the flanges can take a bit of a beating, with possible long term wear damage.
__________________

__________________
JIY 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 08:27.


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