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Old 05-10-2008, 03:39 PM
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Default Advise needed for mounting seat pedestals on our boat

I need to mount two 30" inch tall pedestals to the deck of my 73 chaporral 223 that is being restored. What is the most secure method of accomplishing this task. My main concern is that the deck can not support the seat and person sitting on it in rough seas. I am looking for advise on how to safely secure the 8" base while keeping the deck from being ripped apart.

Thanks,

Steven
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Old 05-11-2008, 05:43 AM
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Default Re: Advise needed for mounting seat pedestals on our boat

Do you have access to the underside of the deck?
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Old 05-11-2008, 06:08 AM
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Default RE: Advise needed for mounting seat pedestals on our boat

If you can't access the underside of the deck to through-bolt, use the stainless togglers (Garelick makes them).
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Old 05-11-2008, 06:33 AM
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Default Re: Advise needed for mounting seat pedestals on our boat

The first issue to address is "can the floor structure support the weight of the seats and occupant without breaking down".
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Old 05-11-2008, 07:26 AM
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Default Re: Advise needed for mounting seat pedestals on our boat

No access to the underside of the deck, I have the stainless steel "toggler's" to install the pedestals also. The deck is sturdy also. My concern is reinforcing the underside of the deck to compensate for the increased stress when I have someone sitting down and the boat is underway. The key here is that the pedestals are 30" tall.

Steven
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Old 05-11-2008, 09:46 AM
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Default Re: Advise needed for mounting seat pedestals on our boat

That 30" pedestal will have a lot of leverage on the deck. When I took apart my old 88 Four Winns, which had 2 pedestal seats up front but they were only about 11" high, I found that the deck itself was 1/2 ply but underneath that was a 3/4 in thick reinforcement for a total thickness of 1 1/4 " in that area. I used the same size wood screws to install the new pedestals but soaked the holes in CPES and bedded them in 3M 4200. They are very strong but I don't know if that would hold up under the leverage of a pedestal that is almost 3x as high, depending on the weight of the occupant. And on a boat that age, the chance of the deck being really solid, unless it was always stored inside, is not all that great.
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Old 05-11-2008, 02:04 PM
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Default Re: Advise needed for mounting seat pedestals on our boat

Usually a 30" pedestal floor plate will have a larger area than a 16" high stand to spread the stress over a larger area.

Doubling the diameter makes it cover 4x the area, so do some measurements and multilply 3.14 x radius squared to see if that area is covered. Leverage is directly proportional to height, so a 12" diameter plate is more than 2x larger than a 8" plate and will handle a seat that is 2x as high.

But the next concern is having an aluminumum baking plate or larger washers under the floor so that the increased leverage won't pull the bolts up through the panel.
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Old 05-11-2008, 02:25 PM
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Default Re: Advise needed for mounting seat pedestals on our boat

Quote:
scubasteven - 5/11/2008 9:26 AM No access to the underside of the deck, I have the stainless steel "toggler's" to install the pedestals also. The deck is sturdy also. My concern is reinforcing the underside of the deck to compensate for the increased stress when I have someone sitting down and the boat is underway. The key here is that the pedestals are 30" tall. Steven
This is a bit "out-there" but that's what problem solving is all about.

You "could" cut an access hole 4" diameter at the center of the base and repair itw/ an access plate. That would allow you to add additionalplywood reinforcement glued to the underside of the deck w/ captive T-nuts. It would also give you a "heads-up" on the condition of the deck. Just a thought[img]../images/emoticons/confused.gif[/img]
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Old 05-12-2008, 04:45 PM
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Default Re: Advise needed for mounting seat pedestals on our boat

The base on the pedestals are 8"s and that has been the biggest I have been able to find. I like the idea of cutting an access hole in the deck and reinforcing the underside with starboard. I am also kicking the idea around of building a base, maybe with a tackle station build in and then mounting a shorter pedestal on top. Please keep the ideas coming.

Steven
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Old 05-12-2008, 05:05 PM
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Default Re: Advise needed for mounting seat pedestals on our boat

Don't reinforce with the underside of the deck with Starboard; I think you'll have better luck with aluminum plate or epoxied plywood. The pedestals that we have are not nearly as long as you're planning, but I use a screw-in version, and they've held up well for years.
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