Reply
 
Thread Tools Display Modes
 
Old 10-28-2013, 09:13 PM   #1
Veteran Member
 
Pete37's Avatar
 
City: Grasonville, MD
Country: USA
Join Date: Oct 2013
Posts: 52
Smile Chris Craft Constellation 500s

A forum to discuss the maintenance and repair of Chris Craft Constellation 500 and related motoryachts
__________________
Advertisement

Pete37 is offline   Reply With Quote
Old 10-28-2013, 09:17 PM   #2
TF Site Team
 
Pau Hana's Avatar


 
City: Seattle, WA
Country: Good Ol' US of A!
Vessel Name: Pau Hana
Vessel Model: 1989 PT52 Overseas Yachtfisher
Join Date: Aug 2012
Posts: 1,561
Is this a questions or statement?

BTW- welcome!
__________________

__________________
Peter- Marine Insurance Guru & tuna fishing addict!

1989 52' PT Overseas yachtfisher
Pau Hana is offline   Reply With Quote
Old 10-28-2013, 10:47 PM   #3
TF Site Team
 
Janet H's Avatar
 
City: Inland NW
Country: USA
Vessel Name: Pacifica
Vessel Model: Cape Dory
Join Date: Jan 2012
Posts: 1,588
Welcome to the board. We're looking at setting up a builders forum for Chris Craft Constellations and other trawlers so you're just in time
Janet H is offline   Reply With Quote
Old 11-01-2013, 03:08 PM   #4
Veteran Member
 
Pete37's Avatar
 
City: Grasonville, MD
Country: USA
Join Date: Oct 2013
Posts: 52
Hi Janet,

Had a bad computer breakdown and have been offline for a while. Looking for something that looks like a Chris Craft forum but not sure I've found it.

The latest topic on the Boat US Forum is freewheeling which means running with one engine on and the other off.

Turns out this saves about half the fuel with a loss of only about 1.3 knots in speed. Our test boat has gone from 0.75 nmpg at 10.5 knots to more than 1.5 nmpg at 9.2 knots. We're even getting some reports of 1.85 nmpg. A huge cost saving.

This is a trick that can be done with just about any twin engine boat so it probably applies to other boat brands.

I'm going to try to transition the discussion to this forum.

Pete37
Pete37 is offline   Reply With Quote
Old 11-01-2013, 03:31 PM   #5
Veteran Member
 
Pete37's Avatar
 
City: Grasonville, MD
Country: USA
Join Date: Oct 2013
Posts: 52
Hi Janet,

Made a post but the forum gobbled it up. Wiil have to try again.

Pete37
Pete37 is offline   Reply With Quote
Old 11-01-2013, 05:27 PM   #6
Guru
 
ranger42c's Avatar
 
City: Maryland
Country: USA
Vessel Model: 42' Sportfish
Join Date: Aug 2013
Posts: 2,661
Quote:
Originally Posted by Pete37 View Post

The latest topic on the Boat US Forum is freewheeling which means running with one engine on and the other off.
You've probably visited the related issues, but FWIW some marine gears might not like freewheeling... since they're not being lubricated when the engine is off. (Happens our gears are fine, at slow trolling speeds, according to the manufacturer.. but I didn't ask them about higher speeds like yours.)

Another issue is maybe about dripless shaft seals. You probably don't have those, but newer boats might be adversely affected under freewheeling there, too.

Just thoughts... useful to check with manufacturers, etc. for real factoids.

-Chris
__________________
South River, Chesapeake Bay
ranger42c is offline   Reply With Quote
Old 11-02-2013, 12:45 PM   #7
Veteran Member
 
Pete37's Avatar
 
City: Grasonville, MD
Country: USA
Join Date: Oct 2013
Posts: 52
Hi Chris,

Yes, we are aware of the lubrication problems. TwinDisc says we need to run the tranny 5 minutes in neutral for every 8 hours to keep them lubricated. That's not much of a problem. Our typical cruising speeds in this mode are 9 to 10 knots. Fast for a classic trawler but not a problem for the trannys. TwinDisc knows what speeds we are operating at and has no problem with them. Most Connies use the old MG5909 trannys which don't have dripless shaft seals.

I used to keep my boat on the South River a long time ago. Nice river. We keep our Connie at Piney Narrows Yacht Haven on Kent Island now under a covered slip. Covered slips are the greatest invention since sliced bread.

So far we haven't found any problems with free wheeling and everyone is loving the nearly 50% reduction in fuel consumption. Can't recommend it for all trannys though; we only know about TwinDisc trannys.

Pete37
Pete37 is offline   Reply With Quote
Old 11-02-2013, 12:49 PM   #8
Veteran Member
 
Pete37's Avatar
 
City: Grasonville, MD
Country: USA
Join Date: Oct 2013
Posts: 52
Hi Again Chris,

What in hell is FWIW?

Pete37
Pete37 is offline   Reply With Quote
Old 11-02-2013, 12:57 PM   #9
Senior Member
 
knotheadcharters's Avatar
 
City: Jacksonville, FL
Vessel Name: Amar la Vida
Vessel Model: 1989 Carver Californian 48' MY
Join Date: Jan 2011
Posts: 289
FWIW for what it's worth
knotheadcharters is offline   Reply With Quote
Old 11-02-2013, 03:26 PM   #10
Guru
 
ranger42c's Avatar
 
City: Maryland
Country: USA
Vessel Model: 42' Sportfish
Join Date: Aug 2013
Posts: 2,661
Quote:
Originally Posted by Pete37 View Post
Hi Chris,

Yes, we are aware of the lubrication problems. TwinDisc says we need to run the tranny 5 minutes in neutral for every 8 hours to keep them lubricated. That's not much of a problem. Our typical cruising speeds in this mode are 9 to 10 knots. Fast for a classic trawler but not a problem for the trannys. TwinDisc knows what speeds we are operating at and has no problem with them. Most Connies use the old MG5909 trannys which don't have dripless shaft seals.

I used to keep my boat on the South River a long time ago. Nice river. We keep our Connie at Piney Narrows Yacht Haven on Kent Island now under a covered slip. Covered slips are the greatest invention since sliced bread.

So far we haven't found any problems with free wheeling and everyone is loving the nearly 50% reduction in fuel consumption. Can't recommend it for all trannys though; we only know about TwinDisc trannys.

Pete37

Yep, figured you had it all sorted. (And sometimes forums posts are also aimed at future readers.)

We're near the mouth of the River, easy access to the Bay... I know Piney Narrows, too, and learned much later that an uncle of mine used to keep his boat there long ago...

Cheers, -Chris
__________________
South River, Chesapeake Bay
ranger42c is offline   Reply With Quote
Old 11-02-2013, 07:22 PM   #11
Veteran Member
 
Pete37's Avatar
 
City: Grasonville, MD
Country: USA
Join Date: Oct 2013
Posts: 52
Hi Chris,

Kept my boat at Holiday Point Marina on Selby Bay. It was a dump at the time but I've heard them spiffed it up a lot since then.

Pete37
Pete37 is offline   Reply With Quote
Old 11-03-2013, 05:07 AM   #12
Guru
 
ranger42c's Avatar
 
City: Maryland
Country: USA
Vessel Model: 42' Sportfish
Join Date: Aug 2013
Posts: 2,661
Quote:
Originally Posted by Pete37 View Post
Hi Chris,

Kept my boat at Holiday Point Marina on Selby Bay. It was a dump at the time but I've heard them spiffed it up a lot since then.

Pete37

Yeah, that's right next door to us... with deeper water. Looks like a nice enough place to me; on site services, etc.

-Chris
__________________
South River, Chesapeake Bay
ranger42c is offline   Reply With Quote
Old 11-03-2013, 06:14 PM   #13
Veteran Member
 
City: ChicagoIL home, orange Beach, AL now
Country: USA
Vessel Name: Miss Donna
Vessel Model: Chris craft constellation
Join Date: Nov 2013
Posts: 52
Hello Pete, and all members.
I am the skipper of Miss Donna, the test boat for freewheeling.
After freewheeling for 180 miles I topped off with 160 gallons. Giving me 1.125 mpg. 1400 rpm getting me 9knt's. I was hoping for better, however I am traveling on the ten tom with barges to pass, locks to navigate and of course varying depths and currents. Which is nice to have the option to fire up the other engine underway. Dormant tranny stays cool around 102 degrees. The only reason it is that warm is from ambient temps from the engine from occasionally running it. Also I ran from my saddle tanks that do not receive the unused fuel.
Keep in mind I am doing this to conserve fuel and also keep the engine running at recommended temps.
Does anybody have any idea how much fuel is returned? I would imagine a true mpg test would be running from the stern tanks which receive the unused fuel.
Miss Donna is offline   Reply With Quote
Old 11-04-2013, 06:53 AM   #14
FF
Guru
 
FF's Avatar
 
Join Date: Oct 2007
Posts: 15,619
Giving me 1.125 mpg. 1400 rpm getting me 9knt's.

Knots is very unusual inland , most waterways are measured statute miles.

Either way you will find dropping to 7K may double (or better) your KPG or MPG.

We ran the loop at 7 and got almost 3 mpg.50 ft also.

Slow works if you need or like to run cheaply.
FF is online now   Reply With Quote
Old 11-04-2013, 12:13 PM   #15
Veteran Member
 
City: ChicagoIL home, orange Beach, AL now
Country: USA
Vessel Name: Miss Donna
Vessel Model: Chris craft constellation
Join Date: Nov 2013
Posts: 52
Hello FF, the reason I started freewheeling was becouse I have detroit 6v92's.
They need to be run at 185 degrees, can't do that unless I run at 1400 rpm hence I am only running one at a time.
Miss Donna is offline   Reply With Quote
Old 11-04-2013, 12:30 PM   #16
TF Site Team
 
Baker's Avatar
 
City: League City, Tx
Country: Texas
Vessel Model: Carver 356
Join Date: Oct 2007
Posts: 5,406
Maybe we need to find y'all your own builder's forum so you can discuss all of this!!!... I will be working on it!
Baker is offline   Reply With Quote
Old 11-04-2013, 02:22 PM   #17
Guru
 
ranger42c's Avatar
 
City: Maryland
Country: USA
Vessel Model: 42' Sportfish
Join Date: Aug 2013
Posts: 2,661
Quote:
Originally Posted by Baker View Post
Maybe we need to find y'all your own builder's forum so you can discuss all of this!!!... I will be working on it!

Aside from the obvious CC-specific stuff... I would think "freewheeling" in the sense used here is maybe applicable to a wide range of boat/engine/gear brands...

-Chris
__________________
South River, Chesapeake Bay
ranger42c is offline   Reply With Quote
Old 11-04-2013, 03:33 PM   #18
TF Site Team
 
Baker's Avatar
 
City: League City, Tx
Country: Texas
Vessel Model: Carver 356
Join Date: Oct 2007
Posts: 5,406
Quote:
Originally Posted by ranger42c View Post
Aside from the obvious CC-specific stuff... I would think "freewheeling" in the sense used here is maybe applicable to a wide range of boat/engine/gear brands...

-Chris
It certainly is!! But not in the "Welcome Mat" part of the forum.
Baker is offline   Reply With Quote
Old 11-04-2013, 04:21 PM   #19
Guru
 
timjet's Avatar
 
Join Date: Apr 2009
Posts: 1,905
Running single engine on a twin has been discussed thoroughly before on this forum. Do a search going back 2-3 years and you'll find a lot of info and opinions on this. Provided you can get past the dripless seals and free wheeling tranny problems there is an easy way to determine if single engine operation is cost effect from a fuel stand point.

Operate your boat with both engines running at whatever speed you want to compare, but likely just below displacement speed. Note the GPS speed and engine rpm. Now operate single engine at the same rpm as before and note the GPS speed after the boat is trimmed for the single engine. If the GPS speed single engine is more that half the speed with both engines running then there is a fuel saving running single engine.

At about 7.5 kts my boat drops only about 1.5 kt on one engine.
__________________
Tim
Tampa Bay
Carver 355 ACMY Twin Cummins Diesels Sold
timjet is offline   Reply With Quote
Old 11-04-2013, 05:12 PM   #20
Veteran Member
 
City: ChicagoIL home, orange Beach, AL now
Country: USA
Vessel Name: Miss Donna
Vessel Model: Chris craft constellation
Join Date: Nov 2013
Posts: 52
I apologize if I brought this up in the wrong area. Obviously new to site. Give a guy a break.
__________________

Miss Donna is offline   Reply With Quote
Reply

Tags
connies

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 06:14 AM.


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