Cruisers Forum
 


Join CruisersForum Today

Reply
 
Thread Tools Rate Thread Display Modes
Old 03-11-2010, 10:33   #1
Registered User

Join Date: Sep 2010
Location: Northern Ireland
Boat: Hunter 701 23ft - Panache
Posts: 20
Stopcocks on Launching

Hi there, the previous owner of my boat has just contacted me to say that I should close the head stopcock on launching my boat this weekend. Is there any reason you can think why he would advise this?
__________________

__________________
pinnache is offline   Reply With Quote
Old 03-11-2010, 11:09   #2
Senior Cruiser

Cruisers Forum Supporter

Join Date: Mar 2007
Location: Santa Cruz
Boat: Boatless Again
Posts: 4,310
If you have never had the boat in the water since you bought it, it might be a good idea to close all but the engine stopcocks before launch, but otherwise its probably not necessary. You might ask the PO why he advised closing the head stopcock--does he know of a problem with the head which might better be fixed before launch??
__________________

__________________
donradcliffe is offline   Reply With Quote
Old 03-11-2010, 13:16   #3
Registered User
 
swagman's Avatar

Join Date: Sep 2005
Location: Winter land based UK New Forest. Summer months away. Making the transition from sail to power this year - scary stuff.
Boat: Super Van Craft 1320 Power Yacht
Posts: 2,175
Images: 10
Send a message via Skype™ to swagman
You profile does not say what type / size of boat you have bought.
But if launching at speed from a trailer, then an open seacock could see a fountain effect down below!
If a regular launch from a crane / lifter, then I can't seriously think why he's worried. But if he is, perhaps worth following his advice.
JOHN
__________________
Don't take life too seriously. No ones going to make it out alive......Go see our blog at http://www.sailblogs.com/member/yachtswagman/
swagman is offline   Reply With Quote
Old 03-11-2010, 13:21   #4
Registered User
 
sabray's Avatar

Join Date: Aug 2008
Location: Wash DC
Boat: PETERSON 44
Posts: 3,169
I usually have the lift operator leave the slings below the boat while I check the bilges. A leftover habit from the days of wood. Last launch I had a bit of water come in from the stuffing box and they waited until I had it set proper. seems prudent to close the sea cocks though.
__________________
sabray is offline   Reply With Quote
Old 03-11-2010, 13:22   #5
Registered User

Join Date: Sep 2010
Location: Northern Ireland
Boat: Hunter 701 23ft - Panache
Posts: 20
Specifically stopcocks on head

Hi there was speaking to my seller from Protugal today and he said that nothing wrong with head, just some friendly advice re stopcocks on heads in general manner. He simply said that it was good advice to generally turn off the stopcocks for the head unless it was actually being used and that there was nothing wrong with the head.

He suggested that a stopcock may siphon water into the head if left open when the boat is in the water.

What do you think?
__________________
pinnache is offline   Reply With Quote
Old 03-11-2010, 16:35   #6
Registered User

Join Date: Sep 2010
Location: Northern Ireland
Boat: Hunter 701 23ft - Panache
Posts: 20
Update

Quote:
Originally Posted by swagman View Post
You profile does not say what type / size of boat you have bought.
JOHN
I have a hunter 701 23ft fin keel GRP hull Lead keel on a converted yard cradle now with wheels, will attempt a trailer launch at the local slipway this Saturday with a tractor...If this doesn't work out ( we have alot of sand and littel depth and I draw 4ft) I will pull out and reposition for a crane drop next week

CJ
__________________
pinnache is offline   Reply With Quote
Old 04-11-2010, 08:05   #7
Registered User
 
denverd0n's Avatar

Join Date: Jun 2008
Location: Tampa, FL
Posts: 3,948
Images: 6
Quote:
Originally Posted by pinnache View Post
He suggested that a stopcock may siphon water into the head if left open when the boat is in the water. What do you think?
If the head is properly installed, with an anti-siphon loop and vent, then this should not be a problem. Sounds like you need to take a look at how the head is plumbed.
__________________
denverd0n is offline   Reply With Quote
Old 04-11-2010, 08:45   #8
Freelance Delivery Skipper..
 
boatman61's Avatar

Community Sponsor
Cruisers Forum Supporter

Join Date: Jan 2010
Location: UK/Portugal
Posts: 20,189
Images: 2
Send a message via Skype™ to boatman61
pirate

I'd suggest you close every single stop cock on the boat... then while its still in the slings go round turning them on one by one... there have been occasions in the past when a stop cock has not actually been attatched to anything....
Saves a panic dash round trying to figure out where the waters coming from... hell the price they're charging for the launch more than justifies the extra 15 minutes while you check your water tightness
__________________


Born To Be Wild
boatman61 is offline   Reply With Quote
Old 04-11-2010, 08:57   #9
Writing Full-Time Since 2014
 
thinwater's Avatar

Join Date: Nov 2008
Location: Deale, MD
Boat: PDQ Altair, 32/34
Posts: 4,328
Quote:
Originally Posted by boatman61 View Post
I'd suggest you close every single stop cock on the boat... then while its still in the slings go round turning them on one by one... there have been occasions in the past when a stop cock has not actually been attatched to anything....
Saves a panic dash round trying to figure out where the waters coming from... hell the price they're charging for the launch more than justifies the extra 15 minutes while you check your water tightness
Yup, my yard always requests this, and they will always do that if the owner is not present. They always perform a bilge check. Just smart practice.

Also, leaving valves open is an excelent way to grow barnacles in the hoses. Best to shut them when not in use.
__________________
Gear Testing--Engineering--Sailing

Writing full-time since 2014.
Bookstore:http://sail-delmarva.blogspot.com/20...ook-store.html
thinwater is offline   Reply With Quote
Old 04-11-2010, 11:52   #10
Senior Cruiser
 
jackdale's Avatar

Cruisers Forum Supporter

Join Date: Mar 2008
Location: Calgary, AB, Canada
Posts: 5,040
Images: 1
Quote:
Originally Posted by denverd0n View Post
If the head is properly installed, with an anti-siphon loop and vent, then this should not be a problem. Sounds like you need to take a look at how the head is plumbed.
Anti-siphoning loops are a "fairly" recent development.

That being said, close all the seacocks with the exception of the raw water intake. You may need to start the engine quickly after the boat is in the water.
__________________
ISPA Yachtmaster Ocean Instructor Evaluator
Sail Canada Advanced Cruising Instructor
IYT Yachtmaster Coastal Instructor
ASA 201, 203,204, 205, 206, 214
As I sail, I praise God, and care not. (Luke Foxe)
jackdale is offline   Reply With Quote
Old 04-11-2010, 12:53   #11
cat herder, extreme blacksheep
 
zeehag's Avatar

Cruisers Forum Supporter

Join Date: Jul 2008
Location: furycame alley , tropics, mexico for now
Boat: 1976 FORMOSA yankee clipper 41
Posts: 17,762
Images: 56
Send a message via Yahoo to zeehag Send a message via Skype™ to zeehag
Quote:
Originally Posted by jackdale View Post
Anti-siphoning loops are a "fairly" recent development.

That being said, close all the seacocks with the exception of the raw water intake. You may need to start the engine quickly after the boat is in the water.
funny you should say this about anti siphoning loop vents, as all my boats always had them-- from 1965 on forward to this date-- how recent are you discussing here for the introduction of these recent developments?/ is 40 yrs recent?? just wondering, as i cant figger out how many years is recent...means a different thing to each and every reader, seems.....

and, yes, is a good thing to make sure they are closed before introducing water to hull.
zeehag is offline   Reply With Quote
Old 04-11-2010, 12:56   #12
Senior Cruiser
 
jackdale's Avatar

Cruisers Forum Supporter

Join Date: Mar 2008
Location: Calgary, AB, Canada
Posts: 5,040
Images: 1
Zeehag

I used to sail a 1984 C&C 35 that did not have anti-siphoning loops in the head intake. A friend discovered this when he forgot to close the flush lever.
__________________
ISPA Yachtmaster Ocean Instructor Evaluator
Sail Canada Advanced Cruising Instructor
IYT Yachtmaster Coastal Instructor
ASA 201, 203,204, 205, 206, 214
As I sail, I praise God, and care not. (Luke Foxe)
jackdale is offline   Reply With Quote
Old 04-11-2010, 13:00   #13
cat herder, extreme blacksheep
 
zeehag's Avatar

Cruisers Forum Supporter

Join Date: Jul 2008
Location: furycame alley , tropics, mexico for now
Boat: 1976 FORMOSA yankee clipper 41
Posts: 17,762
Images: 56
Send a message via Yahoo to zeehag Send a message via Skype™ to zeehag
Quote:
Originally Posted by jackdale View Post
Zeehag

I used to sail a 1984 C&C 35 that did not have anti-siphoning loops in the head intake. A friend discovered this when he forgot to close the flush lever.
wow--didnt know that recently there werent any -- so , being out of the loop isnt always a good thing...blug.. yipes....
my formosa didnt have one until i placed one just 2 yrs ago--i thought the restorer forgot to replace them......but my 1965 derelict olympian had them..... so i didnt realize there was a time when, in recent past....there really werent any planned into the design...
zeehag is offline   Reply With Quote
Old 04-11-2010, 16:53   #14
Senior Cruiser

Cruisers Forum Supporter

Join Date: Nov 2005
Location: Tasmania
Boat: VandeStadt IOR 40' - Insatiable
Posts: 2,317
Images: 91
In some cases, the actual bowl is below the level of the waterline and, unless a raised loop (above the w/l) and vacuum breaker is fitted on the water inlet, water can siphon in.

But, as has been pointed out, closing all seackocks when re-launching, is prident anyway. Open them 1 at a time, and check each is watertight prior to opening the next one.
__________________

__________________
Weyalan is offline   Reply With Quote
Reply

Thread Tools
Display Modes Rate This Thread
Rate This Thread:

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


Similar Threads
Thread Thread Starter Forum Replies Last Post
Launching After Antifoul fishingaz Monohull Sailboats 3 05-10-2010 03:01
Delta Anchors Really Self Launching? danielgoldberg Anchoring & Mooring 20 07-03-2010 12:14
Boat Launching Procedures Pelagic Seamanship & Boat Handling 4 23-02-2010 10:12
Launching and Retrieving Alone Dinghy101 General Sailing Forum 14 19-10-2009 17:51
Docking and or Launching whitecaps Multihull Sailboats 0 06-07-2007 14:57



Copyright 2002- Social Knowledge, LLC All Rights Reserved.

All times are GMT -7. The time now is 22:06.


Google+
Powered by vBulletin® Version 3.8.8 Beta 1
Copyright ©2000 - 2017, vBulletin Solutions, Inc.
Social Knowledge Networks
Powered by vBulletin® Version 3.8.8 Beta 1
Copyright ©2000 - 2017, vBulletin Solutions, Inc.

ShowCase vBulletin Plugins by Drive Thru Online, Inc.