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Air pockets in the Hull, what to do?

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djn
Master Marine Consultant

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USA
1561 Posts

Initially Posted - 01/05/2006 : 17:12:21

Hi All, I was at the boat this morning to mount the two winches on the cabin top so I can run all lines back to the cockpit. I am mounting them as far back as possible and between the hand rails and PopTop. When I drilled through for the bolts, the bill drilled through the first layer of fiberglass, then good clean wood, then the bit would suddenly drop about .25 inch then start drilling through the incabin side of the fiberglass. All the wood coming out of the hole looked good, so what is that gap. I see no deformation of the fiberglass in side or on top of the cabin. Cheers.

Dennis
No Boat
S.E. Michigan

Edited by - on

Frank Hopper
Past Commodore

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Pitcairn Island
6776 Posts

Response Posted - 01/05/2006 : 17:23:00

hull liner vs deck
normal
use fender washers or better to back up
enjoy the new hardware

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atgep
Master Marine Consultant

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1009 Posts

Response Posted - 01/05/2006 : 19:05:28

The liner poses a few problems when mounting hardware. You can deal with the onner liner a couple of ways.

1. Fill the area between the liner and deck with a thickened epoxy mixture. This will only be in the localized area.

2. Mount it without worriying. This may result in the liner depressing around the fastners.

3. Use a hole saw to cut a fender washer sized hole in the liner. Now the nut and washer can be secured to the deck. The oversized holes can be covered up with a wood or starboard plate.

Some things I wouldnt worry about bolting to the liner. Highly loaded things should be very securely mounted.

Tom.

Edited by - atgep on 01/05/2006 19:08:32

djn
Master Marine Consultant

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USA
1561 Posts

Response Posted - 01/05/2006 : 19:20:14

Frank, thank for the clutch and deck organizere again. They will be mounted tomorrow. I am using the big fender washers. Cheers and I hope you are healing well. Will we see you at the nationals this year?

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Champipple
Master Marine Consultant

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USA
6855 Posts

Response Posted - 01/05/2006 : 19:52:53

One other thing - the load on the clutches is for/aft, so your not going to get a lot of up/down force. Make sure your holes are as tight to the screw as possible.

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djn
Master Marine Consultant

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USA
1561 Posts

Response Posted - 01/05/2006 : 20:46:15

Hi Duane, so you're saying that I do need to use through-bolts on the clutches and deck organizers? Cheers.

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Dave Bristle
Master Marine Consultant

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Djibouti
10005 Posts

Response Posted - 01/05/2006 : 21:35:32

<blockquote id="quote">quote:<hr height="1" noshade id="quote">Originally posted by djn
 Hi Duane, so you're saying that I do need to use through-bolts on the clutches and deck organizers? Cheers.
<hr height="1" noshade id="quote"></blockquote id="quote">
I'm not Duane, but absolutely. The winches pose another issue--indeed the forces are not straight up, but the leverage of a winch against the aft mounting bolts is not insignificant. (Organizers and clutches create less leverage.) The "pocket" is just the space between the molded shape of the liner and the plywood core that's supporting the cabin top. What I've done with a similar issue was to cut a piece of stainless sheet metal to form a reasonable sized backer, drill it for the bolts, and bend it to fit the curve of the liner. That spreads the load better than fender washers. And to state the obvious, be a little careful about how much you torque down the nuts.

Edited by - Dave Bristle on 01/05/2006 21:37:00

Champipple
Master Marine Consultant

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USA
6855 Posts

Response Posted - 01/05/2006 : 22:25:03

We sealed up some really nice peices of Oak that I routered and made all nice and pretty and then backed each piece of hardware with them. The Oak was Half inch, the washers counter sank into them and then the nylon locking nut on top of that. We then cut the remainder of the screw off with a dremel. Kind of overkill, as I mentioned before that the forces aren't all upward, however it made for a really nice looking finished product. The wood also flexed a bit for the bend.

dw

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Leon Sisson
Master Marine Consultant

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USA
1889 Posts

Response Posted - 01/05/2006 : 22:59:08

When I found that void (mounting clutch & winch), I taped over the bottom hole, and used a syringe to pack a bunch of thickened epoxy between the deck and liner. I of course also did the drill 2x oversize, reinforced epoxy fill, and redrill we've discussed many times here. Be careful poking around that area with a drill bit. I found the cabin light wiring -- twice!

-- Leon Sisson

(edited to fix glaring spelling error.)

Edited by - Leon Sisson on 01/05/2006 23:00:43

djn
Master Marine Consultant

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USA
1561 Posts

Response Posted - 01/06/2006 : 07:15:49

Hi Leon, on the port side, the original cabin light is right were the winch needs to go and the wires are right there. I can not find a path to reach up there and move the wires so I am just going to take my chances. Cheers.

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Champipple
Master Marine Consultant

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USA
6855 Posts

Response Posted - 01/06/2006 : 13:57:29

I forgot to mention that. Since our lights are still using the original wire, we put a small ss plate there then covered it with the light. That is the only place where we didn’t have a piece of oak.

The wires run fore-aft right there, so if you do all the math and lay everything out, you should be able to drill the 4 holes for the winches 2 on either side.

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djn
Master Marine Consultant

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USA
1561 Posts

Response Posted - 01/06/2006 : 17:02:13

Hi Duane, unfortunatly, the winch I am mounting has five holes but I think I can ratchet around to clear. I'll let you know how it turns out. Cheers.

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The Officers, Staff and members of this site only provide information based upon the concept that anyone utilizing this information does so at their own risk and holds harmless all contributors to this site.