Reply
 
Thread Tools Search this Thread Display Modes
 
Old 02-14-2019, 08:28 AM   #1
Member
 
City: Los angeles
Country: Usa
Join Date: Sep 2018
Posts: 5
OA 510 Classico transmissions

In my quest to find my next boat I am looking at a 2000 OA 510 Classico that is stabilized and could be bought at a good price.
While we will use this boat local (Channel Islands, CA) for several years, long term we want to do Alaska to Mexico.
I have read many posts of owners, here and on boatdiesel.com, that regularly use a single engine at trawler speeds(7kt) to do LRC.
My question is, can anyone tell me what transmissions this boat would most likely have and can they be left in neutral or locked in gear when off?
This boat has Cat 3126TA engines.
Also, if anyone has one, can you tell me what the engines RPM is at 7kts?
__________________
Advertisement

Hornloaded is offline   Reply With Quote
Old 02-14-2019, 03:07 PM   #2
TF Site Team
 
Insequent's Avatar
 
City: Brisbane
Country: Australia
Vessel Name: Insequent
Vessel Model: Ocean Alexander 50 Mk I
Join Date: Mar 2012
Posts: 2,247
I can't help you regarding transmission brands, but it may not have been a standard spec. Read the name plate when you are on board!

What I and others have found however is that running a twin-engined boat on one engine more likely than not will use slightly more fuel. See attached graph. The issue running on one engine is that I needed 7 of rudder to go in a straight line. That, coupled with drag from the free-wheeling prop more than offset the gains from avoiding the parasitic loads for the second engine. So little to no gain, or more likely a slight loss in fuel economy.

But, I see one advantage of running a twin engined boat on one engine, And that is, with just running one engine to get to the same speed it will be at greater rpm and load, and with a better load-factor. Indeed, at slow speeds neither of the twins are likely to be loaded and warm enough for extended hours of operation. Some engines are more tolerant of low loads than others, usually the newer electronic controlled one are superior in this regard.

I would only run on one engine if I needed extreme range, and was running below 7kn, say 6kn or so. I've never needed to do it, and don't envision ever doing it either.
Attached Files
File Type: pdf Fuel economy.pdf (51.3 KB, 28 views)
__________________

__________________
Brian
Insequent is online now   Reply With Quote
Old 04-03-2019, 05:32 PM   #3
Guru
 
Ken E.'s Avatar
 
City: Bellingham WA
Country: United States
Vessel Name: Hatt Trick
Vessel Model: 45' Hatteras Convertible
Join Date: Nov 2016
Posts: 807
Most Twin Disc transmissions can be freewheeled without damage. The TD website has a pdf file with a list of the models that can or cannot be freewheeled. Other gear brands and models cannot be freewheeled at all and the shaft must be locked down to prevent damage, for example the Allison M20s that I had in a previous boat. You can check with the other gear makers for their specifics.

On the topic of running on one engine, I've done quite a bit of that between here and Alaska. The main attraction to me is to increase the loading on the 'On' engine, although I do burn less fuel even with the rudder deflection mentioned above. As I read in superyacht magazines, it is common for the big guys to shut one off to save fuel when crossing, for example, the Atlantic from the east coast of the US to Europe.
__________________
Ken on Hatt Trick
Ken E. is offline   Reply With Quote
Old 04-04-2019, 12:14 AM   #4
Senior Member
 
Brisyboy's Avatar
 
City: Brisbane
Country: Australia
Vessel Name: Malagari
Vessel Model: Island Gypsy 36 Europa
Join Date: Mar 2015
Posts: 252
Don`t for get the other issue of free wheeling a prop - if the stern gland is cooled/lubricated by water under pressure from its running engine - there won`t be any! There are ways around this but it takes a bit of plumbing
__________________
George
Brisbane
IG 36 Europa
Brisyboy is online now   Reply With Quote
Reply

Tags
cat 3126, oa 510, single engine

Thread Tools Search this Thread
Search this Thread:

Advanced Search
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 03:17 AM.


Powered by vBulletin® Version 3.8.8 Beta 4
Copyright ©2000 - 2019, vBulletin Solutions, Inc.
Search Engine Optimization by vBSEO 3.6.0
Copyright 2006 - 2012