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CG of a 25?

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Jefffriday
Navigator

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USA
198 Posts

Initially Posted - 10/30/2006 : 21:05:46

Anybody know what the relative position of the Center of Gravity to the Keel (mine is a wing) on a 25? I am guessing the keel's center and the boat are very very close. I am thinking of jacking up my boat using four jacks undr the furthest corners of the wing.... then blocking her up on the bed rails for prepping painting the bottom.

infinity
89 wk/sr #5860
Basalt CO.

Edited by - on

Bill Holcomb
Admiral

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USA
769 Posts

Response Posted - 10/31/2006 : 07:27:41

Hey Jeff,

You might want to call Gerry Douglas at the Catalina factory in Woodland Hills CA before you do that. I've never heard that the wings on the wing keel were particularly structural...... especially with 1,250 lbs pushing on each corner (2,500 lbs on each side).

If you do decide to use four jacks, I'd advise really long handles on each jack. I sure wouldn't want to be anywhere close to under the boat during that operation.

Bill Holcomb - C25 Snickerdoodle #4839

Edited by - on

dlucier
Master Marine Consultant

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Virgin Islands (United Kingdom)
7583 Posts

Response Posted - 10/31/2006 : 08:13:43

If the wing keel is made of lead, I'd probably avoid jacking it up using the winglets. One of the winglets on my friend's H28 has a slight curl in it from striking an object.

Edited by - on

Renzo
Admiral

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USA
621 Posts

Response Posted - 10/31/2006 : 09:51:53

I agree that the winglets are not structurally strong enough to support the weight of the boat, and even if they were how were you going to keep the boat from tipping to one side or the other. I also don't think you would want to subject the hull to the uneven forces that would accompany the use of four jacks while you went around jacking each one up individually. My advice would be to bite the bullet and pay to have the boat lifted in slings at a marina and do the work in one day. it beats taking the chance of structurally damaging your hull in ways that might not be immeadiatly Apparent.

L. Caricchio
ZINGARA Sail # 4222
C-25 Fleet Captain, Fleet#3

Edited by - on

djn
Master Marine Consultant

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USA
1561 Posts

Response Posted - 10/31/2006 : 10:15:17

Hi Jeff, I could think of so many ways that could go wrong. I am with Larry on this, take it to your local hoist and have them pull the boat. They most likely have a cradle that you could use for a couple days. Take your time so you can do the job right. Let us know how it all turns out. Cheers.

Edited by - on

Frank Hopper
Past Commodore

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Pitcairn Island
6776 Posts

Response Posted - 10/31/2006 : 10:30:51

The Anchorage north of Denver is a great place. theanchorage.com

Edited by - on

Champipple
Master Marine Consultant

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USA
6855 Posts

Response Posted - 10/31/2006 : 14:56:17

I'll join the consensus. All you need is 6 jack stands and a travel lift. Put the boat down on 5, then sand/paint around them. Take the sixth, and move it next to the other one, rechain the stands (only removing the chains that are in play) take the one youve moved and put in the matching spot on the other side. Repeat.

The Bow stand can be moved for a short period of time, but don't let anyone get on the boat.

I agree that the wing isn't going to give you the support you are looking for.

Edited by - on

Jefffriday
Navigator

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USA
198 Posts

Response Posted - 10/31/2006 : 15:42:33

OK, Unfortunately a lift seems out of the question, So far anyway, still looking. Denver is too far and too much verticle (Vail Pass, Eisenhower tunnel) away, not to mention I need it up for awhile to do the work, sand, paint, and remove those nasty barnicles on the wing. Any ideas would be appreciated.

Edited by - on

Renzo
Admiral

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USA
621 Posts

Response Posted - 10/31/2006 : 18:02:44

How about a heavy duty fork truck with long padded forks, like marinas use to rack store power boats.You could have the boat lifted and moved to a jack stand arrangement like Duane suggested to do the work and then just reverse the process to put it back in the water. a boat dealership might have a fork truck for moving their stock if there is no marina nearby. or you could talk a local heavy equipment operator at a nearby construction site.

L.Caricchio
ZINGARA sail# 4222
Fleet Captain -Fleet#3
Navigo Ergo Sum

Edited by - on

Jefffriday
Navigator

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USA
198 Posts

Response Posted - 10/31/2006 : 18:36:25

Sorry if this seems like a dumb question, but what exactly is a travel lift?

Edited by - on

Frank Hopper
Past Commodore

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Pitcairn Island
6776 Posts

Response Posted - 10/31/2006 : 19:05:26

I does not matter, people like you and I will never see one.
someone will post a photo for you. I would still get it to Denver and just pay to have it done. Sometimes we inland people need to rely on the few resources we have.

Now you know why we don't have them.

Edited by - Frank Hopper on 10/31/2006 19:09:54

Jefffriday
Navigator

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USA
198 Posts

Response Posted - 10/31/2006 : 19:40:17

all righty then....

Edited by - on

Champipple
Master Marine Consultant

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USA
6855 Posts

Response Posted - 10/31/2006 : 19:59:50

Those are pretty large, they do come in smaller inland sizes.

Edited by - on

Carl B.
1st Mate

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USA
83 Posts

Response Posted - 10/31/2006 : 20:09:05

I want one.

Edited by - on

dblitz
Navigator

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240 Posts

Response Posted - 10/31/2006 : 20:40:27

My C-25 was splashed this summer using a large forklift even though the marina had a travelift (used for the really big boys).

Edited by - on

Kip C
Navigator

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USA
243 Posts

Response Posted - 10/31/2006 : 21:41:43

Hi Jeff,
Last spring, I did a complete bottom job on my boat in my driveway, using four boatstands, a 3 ton floor jack, along with the trailer. Basicly, I had two stands in front and two at the stern. First, I loosened the winch cable at the bow, and then, very slowly, raised the boat up off the rollers and keel support. Once the boat was beyond where I wanted it, I put blocking under the keel and lowered it back down alittle, so that at least a portion of the weight was on the keel. When the time came to do the bottom of the keel, I raise the boat back up, removed the two 2x12 keel supports. I used the floor jack as some support when I wasn't working on the keel. This worked very well for me and I felt relatively safe the whole time.(Read - whenever doing something the first time, sh*t can happen)

Good Luck,

PS - There were boatstands for sale, in Co, on catalinaowners.com recently. I think the ad expired. You might post a want ad.

Edited by - Kip C on 10/31/2006 22:08:16

Jefffriday
Navigator

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USA
198 Posts

Response Posted - 11/01/2006 : 08:46:45

Now that looks good. I will try to locate some boat stands, anybody have a set to rent? How did you use the floor jack? was it under the centerline with blocks? Really nice looking work, and a nice looking trailer as well. I know what you mean about doing aomething the first time, I had to lower my mast by myself without ever having seen it done (It went really well, thanks to this forum) But as it started down, the aderenilin flowed nicely.

Edited by - on

crcalhoon
Captain

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USA
303 Posts

Response Posted - 11/01/2006 : 09:27:27

Just a quick word of caution: I once contracted with a marina to haul my boat for something really minor. They did it on a workday when I was unable to be at the marina. They hauled the boat, about five tons, with one of the big fork lifts like they use to put powerboats in the overhead rack storage, although there was a travel lift available. In so doing, they placed one of the fingers under the depth sounder transducer and cracked the surrounding glass very slightly. When I arrived at the boat on Saturday, the first thing I heard was the bilge pump cycling and you can guess the rest of the story. Pretty quick haul out, that was. They stood good for the repair, incidentally.

Edited by - on

Kip C
Navigator

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USA
243 Posts

Response Posted - 11/01/2006 : 21:17:11

Jeff,
That's exactly how I used the jack. I'm just glad it's behind me. Now, each spring, it's only a matter of applying the infamous VC17.

Edited by - on

Daniel
1st Mate

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78 Posts

Response Posted - 11/03/2006 : 17:32:28

I have an 89 wing and stripped & painted the bottom a couple years ago. I had it on four boat stands, with the keel supported by cinderblocks and a board. The boatstands were connected by chain all around.
When it came time to work on the keel underside, I carefully lifted the boat using the stands, elevating each a little at a time. The keel was then temporarily unsupported so I could remove the blocks/board to work on it beneath. I had to leave it like that for a few days while successive paint layers dried, but it seemed pretty stable. Still, i was glad to get the keel back down onto the board and blocks for support when it was all done.

The keel is lead and I think the wings would not support much weight without bending.

Edited by - on

Frank Hopper
Past Commodore

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Pitcairn Island
6776 Posts

Response Posted - 11/03/2006 : 17:44:35

<blockquote id="quote">quote:<hr height="1" noshade id="quote">Originally posted by Daniel
 I had to leave it like that for a few days while successive paint layers dried, but it seemed pretty stable. Still, i was glad to get the keel back down onto the board and blocks for support when it was all done.
<hr height="1" noshade id="quote"></blockquote id="quote">
No Slight intended Dan, but that is why so many of us use VC17, 10 minutes to dry.

Edited by - on

Champipple
Master Marine Consultant

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USA
6855 Posts

Response Posted - 11/04/2006 : 07:32:40

10 minutes? is that the slow drying version? I'd say more like 2 minutes

Edited by - on

Frank Hopper
Past Commodore

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Pitcairn Island
6776 Posts

Response Posted - 11/04/2006 : 11:37:01

under promise over deliver

Edited by - on

dlucier
Master Marine Consultant

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Virgin Islands (United Kingdom)
7583 Posts

Response Posted - 11/04/2006 : 17:26:45

Two minutes for VC17 might still be a generous estimate!

Edited by - on

Champipple
Master Marine Consultant

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USA
6855 Posts

Response Posted - 11/04/2006 : 18:45:30

I've seen it go on the boat and the boat in the water in under 5 minutes.

Yeah, two might be a bit overzealous, I was merely trying to point out that the crap dries fast.

Edited by - on

DaveC25
Navigator

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USA
152 Posts

Response Posted - 11/14/2006 : 16:24:25

I painted mine on the trailer.

What I did was use a hydraulic jack with a post on one side to jack the boat up just off the cradle on that side (whatever you call the boards on each side of the trailer that the boat sits on) and then placed a jack stand under it, set on the trailer, with a block of wood on it. I let the boat down onto the stand and then dropped the cradle. Painted that side, then put the cradle back and sis the same thing to the other side.

Wasn't too bad.

Edit:
I just read above where Kip C did basically the same thing. Incidentally, his came out nicer than mine. :)

-Dave C25

Edited by - DaveC25 on 11/14/2006 16:29:56

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