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Author Topic:   How safe is it to do this:
Salmon Tub posted 03-21-2002 02:16 PM ET (US)   Profile for Salmon Tub   Send Email to Salmon Tub  
Actually, when I say safe, I mean for the hull, what I wanted to know is this: When I bought my boat, I noticed that the sides had a little flex in them. The dealer said it is supposed to flex, nature of the beast and all. O.K. What I want to know is I have seen a lot of pictures here of 17's and 16's (same hull) with thwart seats and so on that lay across and rest on those little ledges on each side (gunnel). Ones in the rear look like they are just held by gravity/tight fit. Ones in front are sometimes screwed down. I want to make a deck just in front of the transom in order to use as a casting platform, and hide tanks under. Then to either place another cooler under RPS, or bait tank, or something. Now my question addresses the following: In an aluminum boat that I had, I placed a similar deck across the mid section, which inherently prevented the sides from flexing. For whatever reason, after this modification, the hull produced some cracks in some of the welds where the bulkheads were. After doing some research, I found out that the deck I installed would not let the hull flex properly in rough water, and thus if it doesn't flex here from stress, it flexes at the next weakest point, i.e. the welds that cracked. Do I need to fear this with fiberglass? Also, should I worry about damage to the gel coat from the wood, or should I laminate on some rubber as pads to protect the Gel-coat? I noticed that some of the gel from my front hatch had chipped - probably due to bouncing around and banging. Would appreciate any input.
OutrageMan posted 03-21-2002 02:59 PM ET (US)     Profile for OutrageMan  Send Email to OutrageMan     
If I read this correctly, your casting platform will be across the aft most section of the boat. If that is the case, I would not worry too much about the flexing issue. I might cut the ends 1/8" short on each end to allow for a bit of movement. Maybe even elongate the scre holes a bit. Remember that most of the gunwale movement will be amidships.

The rubber pad sound like a good idea. If for nothing else, to quiet things down.

Good luck,

JBCornwell posted 03-21-2002 04:44 PM ET (US)     Profile for JBCornwell  Send Email to JBCornwell     
Howdy, ST.

The 17' Striper had just such a platform in the stern, with a seat mount on it. It was on the same hull as your Montauk, so clearly it is a safe thing to do.

If you were to acquire an '83 Striper rear deck, I don't know how well it would fit behind the RPS, but it sure did offer a lot more storage.

Red sky at night. . .
JB :)

Salmon Tub posted 03-21-2002 04:54 PM ET (US)     Profile for Salmon Tub  Send Email to Salmon Tub     
Yes and no, what I want to do is just rest it across that back ledge with as tight a fit as possible/and or safe for the hull. It will be more for protection of the fuel tanks than as a platform to stand on, but it whould be strong enough to do that aswell. I don't want to screw it down, rather for it to be removable easily. Now, I would like to do this infront and around the console as well, so will flex be an issue here? Is flex or removal of flex even going to be a big deal with the 16/17 ft Montauk hull?
JBCornwell posted 03-21-2002 06:25 PM ET (US)     Profile for JBCornwell  Send Email to JBCornwell     
I doubt that there exists a more rigid hull than a classic Whaler, ST. Remember the promo photo of the OR-18 with the Cat dozer parked on it?

I expect the 11s and 13s to be a bit stiffer than the Montauk, but I wouldn't be surprised to see the Chainsaw Whaler with a dozer parked on it.

Red sky at night. . .
JB :)

Salmon Tub posted 03-21-2002 07:06 PM ET (US)     Profile for Salmon Tub  Send Email to Salmon Tub     
I agree with you JB, but I am concerned with little damage like stress cracks and Gel coat damamge. I am sure the whole won't split or anything major like that.
gunnelgrabber posted 03-21-2002 09:19 PM ET (US)     Profile for gunnelgrabber  Send Email to gunnelgrabber     
salmon tub: i use a homemade quick detach seat of heart pine 7/8" x 8" for my thwart seat.( in place of my rps)it holds 3 adults,but it broke once with a portly buddy sitting in the middle,on a hard landing. a shim,like a cushion pfd, between it and the gastank eliminated the problem..using what i visualize you describing should work ok even with no fannies anchoring it.placed up front in that way i think it'd be bounced loose.good luck...lm
triblet posted 03-21-2002 09:55 PM ET (US)     Profile for triblet  Send Email to triblet     
If you don't anchor it down, when you go fast
the wind may grab it.


Whalerdan posted 03-22-2002 08:38 AM ET (US)     Profile for Whalerdan  Send Email to Whalerdan     
Some where on here, somebody, used a full transom teak swim platform cut down to do this. If I recall correctly he didn't screw it down either. It looked really great! The only draw back was it cost something like $500. Wish I could find one off a old junk boat, I'd clean it up and do the same.
Salmon Tub posted 03-22-2002 11:02 AM ET (US)     Profile for Salmon Tub  Send Email to Salmon Tub     
I spent some time fiddleing around with drawings yesterday, and came up with maybe a bos that would rest on those ledges, contain a single low profile, long tank and float above the deck a few inches. I hate the idea of the tanks being under the RPS, even had some shmow steal mine once. Gunnelgrabber, did you notice any damage to the gel-coat from your seat? I find it hard to believe that wood could do that but I would like to know before hand. Anothe option would be not to make a box, to put a verticle cross member support in the middle, and have tanks under held in place with a removable cross member. Then could build a nice fishbox/cuttingboard on top. Just some ideas.
gunnelgrabber posted 03-22-2002 02:34 PM ET (US)     Profile for gunnelgrabber  Send Email to gunnelgrabber     
salmon tub: yes, it scuffs it up some...hasn't chipped or gone through the gel coat though. the convenience and simplicity are worth it to me . until i re gelcoat it...lm

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