Reply
 
Thread Tools Search this Thread
 
Old 14 July 2005, 11:26   #1
Member
 
Country: UK - Channel Islands
Town: Guernsey
Boat name: Charger
Make: Prosport
Length: 7m +
Engine: Yam 200HP OB
Join Date: Jul 2004
Posts: 90
Dirty bottom

My RIB seems a lot slower this year than last year. It was out of the water over the winter but we did not redo the antifouling as it was fresh for last season and seemed fine. The hull is showing signs of going a bit green, but not exactly an aquatic hanging gardens.

Obviously I'm planning to give it a scrub next time I dry out somewhere, but could the light growth account for an 8kt reduction in top speed? I used to easily get up to around 48kts (GPS) last year, but now struggle to top 40-42.

I'm asking because I'm wondering if the engine might be a bit off tune too, but scrubbing the bottom is much cheaper! It was only serviced a couple of months ago.

Thanks

Dan
__________________

__________________
Squirrel is offline   Reply With Quote
Old 14 July 2005, 11:31   #2
Member
 
Country: UK - England
Town: Southampton
Boat name: Shaken Blue
Make: ribcraft
Length: 5m +
Engine: outbord petrol
Join Date: Mar 2005
Posts: 404
Send a message via MSN to hannah
i dont know if this will make any difference to the speed but try a hull cleaner , we bought some to clean off the dirty marks off of our rib , excelent job ! - but very strong .
atleast it will make the boat look clean
__________________

__________________
Hbaker
hannah is offline   Reply With Quote
Old 14 July 2005, 17:10   #3
Member
 
Country: UK - England
Town: Swanmore nr Fareham
Boat name: Greyhound
Make: Ribtec
Length: 7m +
Engine: 225 Opti
Join Date: Oct 2004
Posts: 155
What Hull cleaner did you buy? Was it just for dirty marks and did it work well?
Stuart M is offline   Reply With Quote
Old 14 July 2005, 17:28   #4
Member
 
Country: Ireland
Town: Dublin.
Boat name: Tender 2.
Make: Valiant DR 600
Length: 6m +
Engine: 150 Optimax
MMSI: coming soon !
Join Date: Oct 2002
Posts: 443
My rib lives in the water for seven months of the year. It has to be cleaned every four weeks to get the slime off. Our top speed goes from 40 kts to 25 kts if we dont Ask any sailor that races a yacht. We dont anti foul the boat as it takes one or two knots off top speed.
__________________
Fast... Very feckin fast please.
Scotty is offline   Reply With Quote
Old 15 July 2005, 03:33   #5
Member
 
Country: UK - Channel Islands
Town: Guernsey
Boat name: Charger
Make: Prosport
Length: 7m +
Engine: Yam 200HP OB
Join Date: Jul 2004
Posts: 90
Great thanks. I looked at it last night and its definitely getting worse quickly. Better get scrubbing!
__________________
Squirrel is offline   Reply With Quote
Old 15 July 2005, 06:06   #6
Member
 
Country: UK - Channel Islands
Town: St Peter Port
Boat name: Black Pig
Make: XS-Ribs
Length: 9m +
Engine: 2 x 225hp Optimax
Join Date: Sep 2004
Posts: 375
I don't know whether it's Guernsey in particular but when I cleaned mine the other week I noticed a large amount of jellyfish remains stuck to the hull!

This and the obvious algae bloom season might have a large impact on performance. For some reason in Guernsey the hulls seem to get a thin layer of algae slime that can cut the performance down dramatically.

Take it out of the water and spray with industrial bleach, leave in the sun for a few hours and then wipe over and it should all just fall off without too much effort.

Quite a few people over here tend to just find a deserted beach and beach it at low water and give it a quick spray with bleach. Not exactly environmentally friendly and I'm not suggesting that you should do the same.

However the harbour authorities use parazone when they clean the slipways, pontoons etc. So make your own choice on that one!
__________________
Which part of "throw me the mooring line" didn't you understand!?
pettal is offline   Reply With Quote
Old 16 July 2005, 11:58   #7
Member
 
Country: UK - England
Town: Southampton
Boat name: Shaken Blue
Make: ribcraft
Length: 5m +
Engine: outbord petrol
Join Date: Mar 2005
Posts: 404
Send a message via MSN to hannah
Quote:
Originally Posted by Stuart M
What Hull cleaner did you buy? Was it just for dirty marks and did it work well?
it was called star bright hull cleaner , worked brilliantly our hull is nice , white and shiny !
__________________
Hbaker
hannah is offline   Reply With Quote
Old 16 July 2005, 14:12   #8
Member
 
Country: UK - England
Town: NW& wherever the boat is!
Boat name: depends on m'mood!
Make: Humbers/15-24m cats
Length: 6m +
Engine: etec130/big volvos
MMSI: many and various
Join Date: Nov 2001
Posts: 1,815
The other option is that there is water under the deck. Mate of mine went thru all the hull cleaning etc only to find water was under the floor and in his case there was foam under there soaking it all up and making the outfit very heavy.
__________________
Dave M
www.wavelengthtraining.co.uk
wavelength is offline   Reply With Quote
Old 17 July 2005, 16:31   #9
Member
 
Country: UK - Channel Islands
Town: Guernsey
Boat name: Charger
Make: Prosport
Length: 7m +
Engine: Yam 200HP OB
Join Date: Jul 2004
Posts: 90
Quote:
Originally Posted by wavelength
The other option is that there is water under the deck. Mate of mine went thru all the hull cleaning etc only to find water was under the floor and in his case there was foam under there soaking it all up and making the outfit very heavy.
Definitely not overweight and I've had a good look under the floor.

Petall, I've noticed a lot of blue jellies this year, must have splattered a few of them. I'm off to find a deserted beach....
__________________

__________________
Squirrel 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 09:46.


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