Cruisers Forum
 


Join CruisersForum Today

Reply
 
Thread Tools Rate Thread Display Modes
Old 05-12-2008, 06:44   #1
Senior Cruiser
 
schoonerdog's Avatar

Cruisers Forum Supporter

Join Date: May 2004
Location: annapolis
Boat: st francis 44 mk II catamaran
Posts: 1,174
Images: 4
the perfect location for A/C water intakes

A friend on our dock had the same cruiseair airconditioners that we have and this summer he every 4 days was emptying out his trap because of jellyfish getting stuck and asked me when the last time I had to clean mine.

"I think around 4 months ago?" I replied. Others overheard our conversation and they were also wondering how we could do it so infrequently as they were also having problems. I then realized that I put the intakes for the A/C on the inside of the hulls under the bridgedeck. Jellyfish just don't swim between the hulls into the darkness in a catamaran, maybe it's the shadow contrasting with the light.

So if you want a really care free location for water inlets for your boat, always put it on the inside of the hulls.
__________________

schoonerdog is offline   Reply With Quote
Old 05-12-2008, 07:00   #2
Moderator Emeritus
 
GordMay's Avatar

Join Date: Mar 2003
Location: Thunder Bay, Ontario - 48-29N x 89-20W
Boat: (Cruiser Living On Dirt)
Posts: 31,583
Images: 240
Good advice!
Jellyfish are photosynthetic animals, so have have a preference for the sun, and avoiding shadows.
__________________

__________________
Gord May
"If you didn't have the time or money to do it right in the first place, when will you get the time/$ to fix it?"



GordMay is offline   Reply With Quote
Old 05-12-2008, 07:17   #3
Moderator Emeritus
 
Pblais's Avatar

Join Date: Mar 2003
Location: Hayes, VA
Boat: Gozzard 36
Posts: 8,700
Images: 15
Send a message via Skype™ to Pblais
Quote:
Jellyfish are photosynthetic animals, so have have a preference for the sun, and avoiding shadows.
So does their food.

I'm not sure the argument is that well based though since they clog up strainers at night too. Water temperature might be a better indicator as well as currents. They also favor warmer water and don't navigate that well in a current. Minor difference of both might make some slips more attractive than others to the creatures they eat as well as the creatures themselves.
__________________
Paul Blais
s/v Bright Eyes Gozzard 36
37 15.7 N 76 28.9 W
Pblais is offline   Reply With Quote
Old 05-12-2008, 07:51   #4
Moderator Emeritus
 
GordMay's Avatar

Join Date: Mar 2003
Location: Thunder Bay, Ontario - 48-29N x 89-20W
Boat: (Cruiser Living On Dirt)
Posts: 31,583
Images: 240
Although Jellyfish are passive drifters (zooplankton), mostly transported by water currents, they can also swim with rhythmical contractions of their bell.

Jet propulsion, in jellyfish, is possible because of special muscles called coronal muscles, embedded on the underside of the bell, which push water out of the hollow bell. As water is pushed in one direction, the jellyfish moves in the opposite direction.

Without a brain or eyes, jellyfish rely on nerve cells to help them move, and react to food or danger. Sensing organs tell them whether they are heading up or down, into the light or away from it.
__________________
Gord May
"If you didn't have the time or money to do it right in the first place, when will you get the time/$ to fix it?"



GordMay is offline   Reply With Quote
Old 05-12-2008, 08:03   #5
Marine Service Provider
 
AnchorageGuy's Avatar

Join Date: Mar 2003
Location: Wherever the boat is!
Boat: Marine Trader 34DC
Posts: 4,618
I have installed several of the on the Chesapeake and they seem to resolve the problem quite well. GROCO-970150012 SELF CLEANING WATER STRAINER
__________________
Chesapeake Bay, ICW Hampton Roads To Key West, The Gulf Coast, The Bahamas

The Trawler Beach House
Voyages Of Sea Trek
AnchorageGuy is offline   Reply With Quote
Old 05-12-2008, 08:25   #6
Moderator Emeritus
 
GordMay's Avatar

Join Date: Mar 2003
Location: Thunder Bay, Ontario - 48-29N x 89-20W
Boat: (Cruiser Living On Dirt)
Posts: 31,583
Images: 240
Chuck: You must have very wealthy customers.
GROCO-970150012(LIST $1495.95)$1229.99/each
__________________
Gord May
"If you didn't have the time or money to do it right in the first place, when will you get the time/$ to fix it?"



GordMay is offline   Reply With Quote
Old 05-12-2008, 08:31   #7
Marine Service Provider
 
AnchorageGuy's Avatar

Join Date: Mar 2003
Location: Wherever the boat is!
Boat: Marine Trader 34DC
Posts: 4,618
You don't need them on every strainer, pretty much just the AC unit. How much do you suppose you might spend to replace a few AC pumps and have a service guy on the boat because it eventually caused problems with the compressor. Well worth the money in areas with lots of jellyfish for months and places where debris is a problem.
__________________
Chesapeake Bay, ICW Hampton Roads To Key West, The Gulf Coast, The Bahamas

The Trawler Beach House
Voyages Of Sea Trek
AnchorageGuy is offline   Reply With Quote
Old 05-12-2008, 09:05   #8
Senior Cruiser
 
schoonerdog's Avatar

Cruisers Forum Supporter

Join Date: May 2004
Location: annapolis
Boat: st francis 44 mk II catamaran
Posts: 1,174
Images: 4
Hmm, my filters need biannual cleaning and never have jellyfish, the people right across from me need to clean every othe week. I've got a ton a debris around me, but not between the hulls. I'm guessing then that the hulls protect from them drifting along the surface at night and during the day your probably right in that they avoid shadows.

Quote:
Originally Posted by Pblais View Post
So does their food.

I'm not sure the argument is that well based though since they clog up strainers at night too. Water temperature might be a better indicator as well as currents. They also favor warmer water and don't navigate that well in a current. Minor difference of both might make some slips more attractive than others to the creatures they eat as well as the creatures themselves.
schoonerdog is offline   Reply With Quote
Old 05-12-2008, 14:16   #9
Moderator Emeritus
 
GordMay's Avatar

Join Date: Mar 2003
Location: Thunder Bay, Ontario - 48-29N x 89-20W
Boat: (Cruiser Living On Dirt)
Posts: 31,583
Images: 240
Quote:
Originally Posted by Chuck Baier View Post
You don't need them on every strainer, pretty much just the AC unit. How much do you suppose you might spend to replace a few AC pumps and have a service guy on the boat because it eventually caused problems with the compressor. Well worth the money in areas with lots of jellyfish for months and places where debris is a problem.
At $200 for a March Pump, and $200 Labour, it wouldn't take many failures (about 3) to justify the high cost of the macerating strainer to me; but sans jellyfish, my Florida customers would have been a hard sell.
__________________
Gord May
"If you didn't have the time or money to do it right in the first place, when will you get the time/$ to fix it?"



GordMay is offline   Reply With Quote
Old 05-12-2008, 14:18   #10
Marine Service Provider
 
AnchorageGuy's Avatar

Join Date: Mar 2003
Location: Wherever the boat is!
Boat: Marine Trader 34DC
Posts: 4,618
Gord, Really haven't installed any out of the Chesapeake.
__________________

__________________
Chesapeake Bay, ICW Hampton Roads To Key West, The Gulf Coast, The Bahamas

The Trawler Beach House
Voyages Of Sea Trek
AnchorageGuy 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
The Perfect Tender....??? Yachts66 Auxiliary Equipment & Dinghy 56 12-12-2008 13:36
Plumbing new water tank intakes, questions bobfnbw Plumbing Systems and Fixtures 6 31-10-2008 09:22
The TOO perfect catamaran sandy daugherty Multihull Sailboats 4 03-09-2008 01:25
Yanmar 3QM30F Serial Number location? Raw Water Pump Problem... JohnnyB Engines and Propulsion Systems 14 27-06-2008 04:13
the perfect boat? Hasenmann Monohull Sailboats 6 22-12-2004 08:25



Copyright 2002- Social Knowledge, LLC All Rights Reserved.

All times are GMT -7. The time now is 21:12.


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.