Reply
 
Thread Tools Display Modes
 
Old 05-09-2014, 07:23 PM   #41
Senior Member
 
Bilgewater's Avatar
 
City: New Bern, N.C.
Country: USA
Join Date: Jun 2011
Posts: 257
Both my props looked like the struts, with some previous coating flaking off. Stripped, sanded, and painted with Rust Oleum zinc cold galvanizing. I'll see how she looks in October at haul out.
__________________
Advertisement

__________________
Bilgewater
"Keep putting off till tomorrow, and you'll end up with a lot of empty yesterdays" Prof. Harold Hill
Bilgewater is offline   Reply With Quote
Old 05-09-2014, 09:01 PM   #42
Guru
 
Moonstruck's Avatar
 
City: Hailing Port: Charleston, SC
Country: USA
Vessel Name: Moonstruck
Vessel Model: Sabre 42 Hardtop Express
Join Date: Nov 2008
Posts: 7,855
Quote:
Originally Posted by boatpoker View Post
On your what ?
__________________

__________________
Don on Moonstruck
Sabre 42 Hardtop Express & Blackfin 25 CC
When cruising life is simpler, but on a grander scale (author unknown)
http://moonstruckblog.wordpress.com/
Moonstruck is offline   Reply With Quote
Old 05-10-2014, 01:11 AM   #43
Guru
 
JDCAVE's Avatar
 
City: Lions Bay, BC
Country: Canada
Vessel Name: Phoenix Hunter
Vessel Model: Kadey Krogen 42 (1985)
Join Date: Apr 2011
Posts: 1,614
Zing!

Okay! Okay! Okay!

;-)
JDCAVE is offline   Reply With Quote
Old 05-15-2014, 11:32 AM   #44
Guru
 
koliver's Avatar
 
City: Saltspring Island
Country: BC, canada
Vessel Name: Retreat
Vessel Model: C&L 44
Join Date: Nov 2007
Posts: 2,174
over the years, I have tried bottom paint on my props with inconclusive results. 2 years ago I painted one lobe on each prop and could see no difference in teh amount of barnacle growth when compared to the unpainted lobes. So last year, on April 14, I hauled and chose to leave the props unpainted. By the end of June, i had so much barnacle growth that it overloaded boat engines. When i got to warmer water, I manually removed the barnacles, while in the water. By April again, the growth is so thick that the engines are blowing black smoke and won't get up to full speed.
I attribute this dramatic change from other years to a change of location. from April to October, my boat is now moored at Saltspring Island, from October to April, in Vancouver's Coal Harbour. The salinity of the water and its health for barnacles is dramatically different, so a different regime is called for. I haul again on June 1, so this time I will be painting the props.
koliver is offline   Reply With Quote
Old 05-18-2014, 06:41 AM   #45
FF
Guru
 
FF's Avatar
 
Join Date: Oct 2007
Posts: 16,537
i had so much barnacle growth that it overloaded boat engines

MR Herrishoff used to explain that you should envision the prop and growth blown up to the size of the boat !

That makes it easier to understand what growth does to the performance.
FF is offline   Reply With Quote
Old 05-18-2014, 09:23 AM   #46
Guru
 
City: North Charleston, SC
Country: USA
Join Date: Sep 2010
Posts: 4,390
My thought is, if this would work, someone (probably a prop manufacturer) would have figured this out many years ago and incorporated it into their products.
rwidman is offline   Reply With Quote
Old 05-18-2014, 10:27 AM   #47
Guru
 
JDCAVE's Avatar
 
City: Lions Bay, BC
Country: Canada
Vessel Name: Phoenix Hunter
Vessel Model: Kadey Krogen 42 (1985)
Join Date: Apr 2011
Posts: 1,614
Copper plated props?

In the PNW, the most common barnacle is Balanus glandula. This species is the one most commonly responsible for propeller fouling. Understanding the life history of this animal might be helpful in adjusting your cleaning schedule. Barnacles are crustaceans, with 2 motile stages: naupli, and cypris stages. Near the end the cypris stage, they settle. The naupli and cypris stages are timed to the high productivity in the northern parts of the Pacific in March. Settlement takes place in the spring, for the most part.

This is a useful treatise on the subject...

http://scholarspace.manoa.hawaii.edu...pdf?sequence=1

So, in the PNW, at least, it's best to focus your cleaning of the propeller during and after spring. Colonization of the propeller will be at its maximum during April to June. There is some barnacle settlement during the summer months as well.

My boat sits in the freshwater for the most part in April and May, so I am less affected.

Jim
JDCAVE is offline   Reply With Quote
Old 05-18-2014, 10:49 AM   #48
Guru
 
JDCAVE's Avatar
 
City: Lions Bay, BC
Country: Canada
Vessel Name: Phoenix Hunter
Vessel Model: Kadey Krogen 42 (1985)
Join Date: Apr 2011
Posts: 1,614
...note Figure 1 page 417 in the linked document above. Note particularly the lower curve, which shows those individuals newly settled. The curve that show larger individuals in April represent the cohort that settled in the previous spring. Growth is rapid during spring and summer months and individuals who remain immersed have twice the growth rate of those who are exposed at lower tides.
__________________

JDCAVE is offline   Reply With Quote
Reply

Thread Tools
Display Modes

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





All times are GMT -5. The time now is 03:41 PM.


Powered by vBulletin® Version 3.8.8 Beta 4
Copyright ©2000 - 2017, vBulletin Solutions, Inc.
Search Engine Optimization by vBSEO 3.6.0
Copyright 2006 - 2012