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Topic Title: Weight Distribution and Ballast
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Created On: 05/07/2009 11:05:29 AM
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 05/07/2009 11:05:29 AM
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AgentJ
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So I have my single engine 36' Holiday mansion in the water and I have been doing some "getting-to-know-you" type runs to familiarize myself with the boat. My first impression is that the center of gravity is well forward. The boat actually sits at rest with the bow slightly lower than the stern. There are a couple repercussions from this. The boat doesn't track very straight. There is a lot of wobble, that I then tend to overcorrect for. Part of this is me, but part of it is the boat too. The other issue is that during turns the boat pivots around the center of gravity so the stern swings very wide, which in tight quarters is a bit scary.

What I'm wondering is if the addition of several hundred pounds of ballast in the stern might settle things down a bit. the boat was designed for two engines and I'm thinking that the single engine version might be a bit "light" in the back. Any thoughts?
 05/07/2009 02:34:44 PM
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FranticallyRelaxing
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Is there anything up front that shouldn't be there? Like water hiding someplace? Or batteries, or...?

I have no clue what the engine room of a HM looks like, but the best ballast is batteries, they're more than just dead weight since you can use 'em...

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1988 SkipperLiner 53x14
1995 Tracker Party Cruiser 32 *for sale*
2003 Chaparral 260 SSI
2000 Allegro Bus 40' DP
 05/07/2009 03:57:07 PM
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OLD HOUSEBOATER
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You discribed the handling of almost all single engine houseboats regardless of make. Learn to live with it. You will get used to it. Adding weight is counter productive.

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OLD HOUSEBOATER
 05/07/2009 07:21:36 PM
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Pirate
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Amen

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The pirate
 05/07/2009 10:39:01 PM
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Ej
Admiral

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Originally posted by: OLD HOUSEBOATER

You discribed the handling of almost all single engine houseboats regardless of make. Learn to live with it. You will get used to it. Adding weight is counter productive.


Exactly! Practice the practice more.

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 05/08/2009 04:30:40 PM
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FranticallyRelaxing
Admiral

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I gotta near flat, steel bottomed twin engined boat that has none of the handling problems mentioned above...

however, none of youse guys addressed the issue of the bow of his boat being lower in the water than the stern...?

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1988 SkipperLiner 53x14
1995 Tracker Party Cruiser 32 *for sale*
2003 Chaparral 260 SSI
2000 Allegro Bus 40' DP
 05/08/2009 06:33:05 PM
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stmbtwle
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Agent J you're right in your assumption, but adding ballast is a last resort. See how much of the "stuff" you've got stowed in the bow or under (or in) the wheelhouse that you can move further aft (or maybe ashore). Try to keep your fuel tanks full. If your water tank is forward, try running with it only half full unless you think you NEED it full.

If all else fails I'd get a couple 30-gallon plastic drums from a used-drum place (they're cheap) and secure them in the engine room. Then put in just enough water to get the trim you like. If you get clean food-grade drums you can incorporate them into your water system. Bear in mind adding ANY weight slows you down and costs you fuel $$$$.

However the wandering seems to be common with single screw houseboats, even properly trimmed. Practice and experience seems to be the only solution. You probably bought it to USE... so use it, and the practice and experience will come.

Big, heavy, slow vessels are slow to respond, period. Most newbies get impatient and use too much rudder, then when the boat does respond it goes too far too fast and you need to apply rudder the other way to counter the swing. If you're not careful you're all over the place. Use as little rudder as possible, be patient and give the boat time to respond. As soon as it starts to swing take some or all of the rudder off and let momentum work for you instead of against you.

You have a relatively flat bottom and lot's of "sail" area, so a light puff that you wouldn't notice in a different boat can push you off course. This combined with the above can drive you nuts till you learn the touch. It's sort of like riding a bicycle; there's a trick to it that you have to learn, and the only way to learn is to take the boat out and use it.

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Willie
She's a tired old barge but she's paid for! http://s71.photobucket.com/alb...p;current=ef324993.pbw

Edited: 05/08/2009 at 06:45:05 PM by stmbtwle
 05/08/2009 08:12:05 PM
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AgentJ
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Thanks for the replies all!

I'll look into what if anything on board might be messing with the trim, but I think most of what is going on is the steep part of the learning curve. Practice, practice practice.

In addition to the handling learning curve I have a wickedly tough slip to get in and out of. I'll take a couple pictures to show you guys. Let's just say there is a quick current and tight quarters. Great view and good neighbors though.
 05/08/2009 11:05:00 PM
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Ike
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What the Admiral said. Adding weight just makes your boat heavier, sit lower in the water, go slower, and use more fuel. Weight distribution is what it is about. Look at what you have on the boat. If you have a lot of stuff stored on the boat, moved it farther aft. If your tanks are up forward and full think about having them moved the next time you have the boat hauled out.

Also look at the location of appliances and other equipment. Could it be moved aft? You are probably right that the added weight of another engine by adding more weight aft, and it would make your boat more maneuverable by adding a second screw. But it would increase you fuel costs, maintenace costs, not to mention cost of buying the engine.

Flat bottom single screw boats that have a lot of "sail area", also called top hammer, tend to wander.

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Ike
"Don't tell me I can't. Tell me how I can!"
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 05/09/2009 07:20:14 AM
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Ej
Admiral

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My B.I.L. used to own a Holiday with twins and had a tracking problem. I think some of this was due to not having a keel. A gust of wind always seemed to move it around at the worse moment.

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 05/16/2009 07:30:39 PM
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joetil
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A keel really seems to help. My old Burns has ~ a 6"x6" full length keel. We brought the boat home on a 200+ mile trip on one engine, through 5 sets of locks with hardly any problems. Once I got used to the handling with one engine, things worked out pretty well. What about fiberglassing a keel onto your boat the next time you have it out of the water?

It would probably do wonders for the handling and tracking although oversteering a large, heavy, slow boat is a common problem with new "larger slower boat" captains. I replaced the head gaskets in the other engine when I got the boat home and it's been OK ever since.

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joetil
50x15 Burns-Craft in South Fla
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