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Myacht lll
33 Posts |
 Posted - 07/18/2009 : 5:02:55 PM
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I'm wondering if anybody out there has any suggestions as to how I might level out the ride on my 1988 28 Voyager. It has twin 5.7's (recently repowered}and a generator weighing down the stern.It rides so bow high at anything over 8 to 10 knots that it isn't really very comfortable to ride on the bridge, because you can't see over the bow unless you are standing up.This is with the trim tabs fully deployed.I have heard of putting ballasts in the bow to counter this.
Has anyone figured out a different seating arangment for the captain so that he can see what's going on from a seated position?
Also, just for the heck of it, any thoughts on what RPM might give me the optimum GPH?
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Jimbo Song
236 Posts |
Posted - 07/19/2009 : 3:46:12 PM
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When you push it on up to 15-17 kts does it plane off and lower the nose?
Also, are you sure the tabs are down? Sounds like they may not be deploying completely or are collapsing under pressure.
Bob
1987 Carver Voyager 28
Jimbo Song |
Edited by - Jimbo Song on 07/19/2009 3:47:07 PM |
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Myacht lll
33 Posts |
Posted - 07/19/2009 : 4:49:01 PM
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| No, it doesn't really seem to plane off like it should.It stays so bow high that people on the bridge feel uncomfortable. It's like you could slide right off the bridge. I think it must be a trim tab issue. I have the boat out of the water right now for a bottom job and some mechanical work. I will check out the tabs while its out. |
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Jimbo Song
236 Posts |
Posted - 07/20/2009 : 4:38:14 PM
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I think you'll find that's the problem. Most V drive boats need lots of tab to plane off. Mariner and Voyager 28's are no exception.
But once on plane, you can trim the nose up a bit and get better efficiency and mileage.
Bob
1987 Carver Voyager 28
Jimbo Song |
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Rockmeister
USA
307 Posts |
Posted - 07/22/2009 : 09:22:00 AM
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If your boat is getting up on plane properly, at full throttle, the speed will keep climbing once you are on plane. (At least to the max speed of the boat/engine/prop combination.)
You will normally have to back off the throttles some to maintain a steady speed once on plane.
On mine, it takes 15 MPH or so to get on plane and at least 14 MPH to maintain it.
(Statute miles.)
Keeping the 30 gallon (240lbs) water tank in the bow full helps on mine (Helps in rough seas also), trim tabs are almost a definite must to plane, otherwise it takes a while.
79 28' Mariner twin inboard V-drive.
Western Lake Erie: Maumee Bay & The Islands |
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Myacht lll
33 Posts |
Posted - 07/25/2009 : 09:18:47 AM
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I finally got a look at the boat when it was hauled out for a bottom job and discovered the port trim tab to be missing. Obviously that is the problem but I still think I'll put some weight in the bow. My water tank is more less in the center so I really think I need some counter weight forward.
Hugh
1988 Carver Voyager |
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monterey74
USA
51 Posts |
Posted - 07/25/2009 : 6:00:54 PM
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Another often overlooked adjustment that can impact your boat's trim is the rudder "toe-in". Adjusting your two rudders so that they converge at their aft edges will cause the stern of your boat to be pushed higher and bring your bow down. Conversely adjusting them so they diverge at their aft edges will cause your bow to ride higher.
When I first purchased my boat the rudders were set to converge drastically at the aft edge forcing the bow way down and causing the boat to suffer from a severe bow-steer problem. The trim tabs were never needed to push the bow down, in fact I was considering moving the fresh water tank to the stern to help raise the bow higher.
When I changed the rudder alignment the boat's trim became more normal and the bow raises slightly until the boat gets onto a plane. I actually have a reason to use my trim tabs now.
1974 2885 Monterey
1978 2896 Mariner (Stripped down to the gunwale and ready to cut) |
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Myacht lll
33 Posts |
Posted - 07/26/2009 : 6:59:27 PM
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Now we're talking. I was wondering about that. One of the problems that I will be taking care of soon is with the tiller arm. The ends are so corroded that there is no way to adjust them. I plan on replacing them and when I do that I will make sure the rudders are aligned properly.
Hugh
1988 Carver Voyager
Southwest Fl. |
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Jimbo Song
236 Posts |
Posted - 07/27/2009 : 07:42:37 AM
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Hugh,
Above you said your boat has a generator. If that is a built in generator I'd love to see photos of the installation.
I's love to add one to my boay but haven't found a set up yet that I like. Yours just might be the one. 
Bob
1987 Carver Voyager 28
"Jimbo Song"
Palm Coast, FL |
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Myacht lll
33 Posts |
Posted - 07/27/2009 : 09:58:07 AM
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Bob, the boat had a 3 KW Onan. It has been removed due to being really old and unreliable due to neglect and I'm replacing it with a 3 KW Westerbeke. Onan doesn't make the 3KW anymore. In fact I'm pretty sure Westerbeke is the only manufacturer that does. It will mount directly behind the port engine where the Onan was. The dealer has measured the area and there is plenty of room. The nice thing about these generators is that they are really quiet (no sound sheild necessary) and they only weigh 180lbs or so. I considered using the new 3KW Honda portable but I found out that it wouldn't power my 16000 BTU air. I talked to Westerbeke about that and they assured me there would be no problem. I don't want to deal with the portable anyway. Just want to bite the bullit and do it right the first time. Gotta have air down here or can't use the boat half the year.
Hugh
1988 Carver Voyager
Southwest Fl. |
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Jimbo Song
236 Posts |
Posted - 07/27/2009 : 8:05:20 PM
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I currently use a Honda EU2000i which runs my A/C very nicely but would love to put in a built in gen when I do my repower next year. I'd love to have a photo of you rinstallation when you get it done.
Bob
1987 Carver Voyager 28
"Jimbo Song"
Palm Coast, FL |
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Topic |
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Riding bow high
