Cruisers Forum
 


Join CruisersForum Today

Reply
 
Thread Tools Search this Thread Rate Thread Display Modes
Old 06-01-2018, 07:50   #1
Registered User

Join Date: Sep 2017
Location: Kiel, Germany
Boat: Farrier F32 RX
Posts: 11
Watermaker on fast Multihulls

Hi,

I am thinking about adding a watermaker to my Farrier F-32 RX Trimaran. Weight shouldn't be a problem (on average the boat might weight less, as I don't have carry excess water).

However I remember reading somewhere, that most
(all?) watermakers don't like to operate at higher boat speeds.

Does anyone have experience with this? What are the practical limits?

Paul
__________________

toolbar is online now   Reply With Quote
Old 06-01-2018, 07:57   #2
Moderator
 
a64pilot's Avatar

Cruisers Forum Supporter

Join Date: Oct 2013
Location: Albany Ga.
Boat: Island Packet 38
Posts: 19,774
Watermaker on fast Multihulls

Speed I’m sure is irrelevant as long as you make certain that at higher speeds that your not introducing any air, the pump and I believe the membrane don’t like air, as in I believe it will ruin them.
In your case I believe I’d want a forward facing scoop for the thru hull. Of course when your not using the water maker the thru hull should be closed.
Give Tellie (Spectra) a call if your considering a DC one or Rich Boren (Cruise RO) if you want an AC machine, both of course have their distinct advantages and in my opinion are very dissimilar products, like your fast tri and my slow full keel are.

My advice is go for a bigger one than you think you will need, cause once you have one, you’ll use more water than you do now, cause you can.
__________________

a64pilot is online now   Reply With Quote
Old 06-01-2018, 08:06   #3
Registered User

Join Date: Jul 2016
Posts: 786
Re: Watermaker on fast Multihulls

If the massive trimarans foiling speed records can, don't see why you can't.

Nothing a thruhull scoop or hose w/ weighted intake won't fix.
__________________
We are sailors, constantly moving forward while looking back. We travel alone, together and as one - to satisfy our curiosity, and ward off our fear of what should happen if we don't.
SV DestinyAscen is offline   Reply With Quote
Old 06-01-2018, 08:21   #4
Writing Full-Time Since 2014
 
thinwater's Avatar

Join Date: Nov 2008
Location: Deale, MD
Boat: PDQ Altair, 32/34
Posts: 4,959
Re: Watermaker on fast Multihulls

Quote:
Originally Posted by toolbar View Post
Hi,

I am thinking about adding a watermaker to my Farrier F-32 RX Trimaran. Weight shouldn't be a problem (on average the boat might weight less, as I don't have carry excess water).

However I remember reading somewhere, that most
(all?) watermakers don't like to operate at higher boat speeds.

Does anyone have experience with this? What are the practical limits?

Paul
Don't. Even my 9000 pound PDQ catamaran would get air in the AC intake (lowest point of bilge) when going hard. All you need is a few bubbles going under the hull as you smash waves. It's not the speed, it's the ventilation under the hull, which you do get (I currently have an F-24 also).

I'm sure you could make water while ghosting at less than 5 knots mid-ocean, the only time you would need to underway. Otherwise, you'll be happier waiting until the hook is down. High pressure pumps hate air bubbles.
__________________
Gear Testing--Engineering--Sailing
Writing full-time since 2014
http://sail-delmarva.blogspot.com/
thinwater is offline   Reply With Quote
Old 06-01-2018, 09:42   #5
Senior Cruiser
 
senormechanico's Avatar

Cruisers Forum Supporter

Join Date: Aug 2003
Boat: Dragonfly 1000 trimaran
Posts: 6,132
Re: Watermaker on fast Multihulls

We have never had a problem making water with our Spectra while deep reaching with chute at around 12 - 13 knots.
The boat was on plane on the Strait of Georgia.
__________________
Memento,homo, quia pulvis es, et in pulverem reverteris.
senormechanico is offline   Reply With Quote
Old 06-01-2018, 10:26   #6
Writing Full-Time Since 2014
 
thinwater's Avatar

Join Date: Nov 2008
Location: Deale, MD
Boat: PDQ Altair, 32/34
Posts: 4,959
Re: Watermaker on fast Multihulls

Quote:
Originally Posted by senormechanico View Post
We have never had a problem making water with our Spectra while deep reaching with chute at around 12 - 13 knots.
The boat was on plane on the Strait of Georgia.
I wonder if up wind would be different. I never thought it was the speed, more the matter of air getting under the hulls when smashing.

My real thought is that there is generally no need to make water when you are really going upwind. Just wait until you slow down. Thus, there is no important conflict.
__________________
Gear Testing--Engineering--Sailing
Writing full-time since 2014
http://sail-delmarva.blogspot.com/
thinwater is offline   Reply With Quote
Old 06-01-2018, 10:38   #7
Senior Cruiser
 
senormechanico's Avatar

Cruisers Forum Supporter

Join Date: Aug 2003
Boat: Dragonfly 1000 trimaran
Posts: 6,132
Re: Watermaker on fast Multihulls

I agree with that.
We were getting near our destination (Desolation Sound) and wanted to arrive with a full tank.
With about 3 hours to go and making around 8 gph, our 26 gallon tank would be full by arrival.
When traveling, we carry only a few gallons to keep weight down, as the tank is in the bow.
__________________
Memento,homo, quia pulvis es, et in pulverem reverteris.
senormechanico is offline   Reply With Quote
Old 06-01-2018, 11:01   #8
Registered User

Join Date: Jul 2016
Posts: 786
Re: Watermaker on fast Multihulls

Quote:
Originally Posted by thinwater View Post
Don't. Even my 9000 pound PDQ catamaran would get air in the AC intake (lowest point of bilge) when going hard. All you need is a few bubbles going under the hull as you smash waves. It's not the speed, it's the ventilation under the hull, which you do get (I currently have an F-24 also).

I'm sure you could make water while ghosting at less than 5 knots mid-ocean, the only time you would need to underway. Otherwise, you'll be happier waiting until the hook is down. High pressure pumps hate air bubbles.

Where's the thruhull located? The F-24 has got to be one of the most exciting boats to sail
__________________
We are sailors, constantly moving forward while looking back. We travel alone, together and as one - to satisfy our curiosity, and ward off our fear of what should happen if we don't.
SV DestinyAscen is offline   Reply With Quote
Old 06-01-2018, 11:16   #9
Writing Full-Time Since 2014
 
thinwater's Avatar

Join Date: Nov 2008
Location: Deale, MD
Boat: PDQ Altair, 32/34
Posts: 4,959
Re: Watermaker on fast Multihulls

Quote:
Originally Posted by SV DestinyAscen View Post
Where's the thruhull located? The F-24 has got to be one of the most exciting boats to sail
On the PDQ it was just in front of the keel.

I down sized to the F-24 because I wanted something quick and fun. I was not disappointed. I liken it to a sports car vs. Winnebago. And the PDQ was a damn fast RV (numerous speed mods).
__________________
Gear Testing--Engineering--Sailing
Writing full-time since 2014
http://sail-delmarva.blogspot.com/
thinwater is offline   Reply With Quote
Old 06-01-2018, 11:50   #10
Senior Cruiser
 
senormechanico's Avatar

Cruisers Forum Supporter

Join Date: Aug 2003
Boat: Dragonfly 1000 trimaran
Posts: 6,132
Re: Watermaker on fast Multihulls

My Spectra is in the bilge midships. Dedicated thruhull is also miships slightly offset and ahead of centerboard, slightly less than 1 foot below waterline.
__________________
Memento,homo, quia pulvis es, et in pulverem reverteris.
senormechanico is offline   Reply With Quote
Old 06-01-2018, 19:52   #11
Senior Cruiser
 
44'cruisingcat's Avatar

Cruisers Forum Supporter

Join Date: Sep 2006
Posts: 8,018
Images: 69
Re: Watermaker on fast Multihulls

Good thing about a fast multihull is that you get to the anchorages nice and early and can do your water making there.
__________________
"You CANNOT be serious!"


John McEnroe
44'cruisingcat is online now   Reply With Quote
Old 06-01-2018, 21:27   #12
Senior Cruiser
 
senormechanico's Avatar

Cruisers Forum Supporter

Join Date: Aug 2003
Boat: Dragonfly 1000 trimaran
Posts: 6,132
Re: Watermaker on fast Multihulls

Around here, sometimes that is why we make it on the fly.
__________________
Memento,homo, quia pulvis es, et in pulverem reverteris.
senormechanico is offline   Reply With Quote
Old 07-01-2018, 00:15   #13
Marine Service Provider

Join Date: Sep 2012
Location: Virgin Islands
Boat: 1999 Leopard 45, 45 foot cat, 1980 Hunter 33, 33 foot monohull
Posts: 575
Re: Watermaker on fast Multihulls

Mine is aft, right next to the engine intake, just inboard of the bottom of the port hull.
contrail is offline   Reply With Quote
Old 07-01-2018, 03:15   #14
Senior Cruiser
 
Dave_S's Avatar

Cruisers Forum Supporter

Join Date: Jun 2016
Location: Brisbane Australia
Boat: Schionning Waterline 1480
Posts: 611
Re: Watermaker on fast Multihulls

If drawing air would be a problem.

You could run the intake through a settling tank or separator or swirl pot where the raw water feed with any air bubbles seperated and the water maker drew it's supply from the bottom of the tank and air was bled of the top of the tank. It would only need to be full while the maker was running and only a couple of liters anyway.
__________________
Regards
Dave
In my defence I was left without adequate supervision !
Dave_S is offline   Reply With Quote
Old 07-01-2018, 10:21   #15
Registered User

Join Date: Aug 2015
Location: South Coast UK
Boat: Outremer 42
Posts: 132
Re: Watermaker on fast Multihulls

Having had a 31-1D, I cannot imagine how a watermaker would survive the aeration. I also suspect the settling tank (which would be the only successful method to my mind) would have to be quite big and have interior baffles given the speeds you will reach.
It is after all a planing hull.
Maybe a scoop at the transom might work but it would still need a separator/settling tank. Have you asked the watermaker manufacturer about high speed fitments? Lots of power cruisers must face the same problem so they are likely to have a menu of suggestions.
__________________

out42 is offline   Reply With Quote
Reply

Tags
multihull, watermaker, hull, water

Thread Tools Search this Thread
Search this Thread:

Advanced Search
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
Fast Cruising Catamarans - How Fast ? freetime Multihull Sailboats 377 18-12-2015 11:48
fast track to sailing ~ how fast?> riderjuan Seamanship & Boat Handling 27 07-06-2014 14:29
Heavy Weather and Multihulls Sonosailor Multihull Sailboats 13 07-03-2008 09:03
Flying Multihulls Water Speed Record Kai Nui Multihull Sailboats 2 11-07-2006 17:29



Copyright 2002- Social Knowledge, LLC All Rights Reserved.

All times are GMT -7. The time now is 14:29.


Google+
Powered by vBulletin® Version 3.8.8 Beta 1
Copyright ©2000 - 2018, vBulletin Solutions, Inc.
Social Knowledge Networks
Powered by vBulletin® Version 3.8.8 Beta 1
Copyright ©2000 - 2018, vBulletin Solutions, Inc.

ShowCase vBulletin Plugins by Drive Thru Online, Inc.