Author Topic: flexing (Read 7202 times)

california special · « **on:** September 20, 2015, 07:29:55 AM »

anyone else experience horrible flexing in the deck of their boat while its under way? any rough water or waves, or 50 mph the whole boat just feels like its coming unglued. i can also see my dashboard bending

Hyperacme · « **Reply #1 on:** September 20, 2015, 07:50:51 AM »

My CV has two boards attached to floor and deck, could the fiberglass have cracked and separated on yours ?
Do you have rotted wood in stringers/floor ?

My deck/dash will vibrate at speeds, but isn't flexing ...

Oldfishguy · « **Reply #2 on:** September 20, 2015, 08:09:25 AM »

Hard to imagine the hull flexing very much, especially to the point you would feel it. You would be having stress cracks in the hull all over the place.

Maybe your transom (or engine mounts) are giving way a little when riding it hard; that you might feel as a flex in the hull. It wouldn't take much of a "give" in the propulsion system for the ship to move unexpectedly as it would amplify as you get further from the source. I'd be putting some pressure on that motor on dry land in a few directions to see if it is all solid in the propulsion area.

still_fishin · « **Reply #3 on:** September 20, 2015, 12:51:45 PM »

Both my boats had the same flexing you are talking about. And both had stringers that were as good as dust. When I got my Intimidator you could push up on the front corner of the boat (right where the rub rail curves back in to the tip) twisting the hull of the boat with it on the trailer. It might be time to rebuild yours.

dorelse · « **Reply #4 on:** September 20, 2015, 10:39:24 PM »

If you're seeing that kind of flex, its time to start looking into your structure...I'm sorry to say you might need to start a winter rebuild project.

Plugcheck · « **Reply #5 on:** September 21, 2015, 08:40:47 AM »

My project Timi flexed so hard due to rotten hull/stringers, it actually split at the rub rail up front. Sounds like you have a winter project on your hands. My CVZ flexed enough to crack the gel and later paint, and I found water logged foam and rotten stringers also.

Cali special · « **Reply #6 on:** September 24, 2015, 07:28:32 AM »

The transom and stringers are toast. And I never put that piece of wood back in after I replaced the tank. Do you guys think I'll pick up some top speed if I can eliminate the flexing?

CVX Fever · « **Reply #7 on:** September 24, 2015, 09:44:35 AM »

Can't comment about the flexing, but if your boat has gained weight due to water soaked flotation foam, stringers, and transom then yes you may pick up some speed once that has been fixed.

Put the center support under the deck back in. The deck of your boat will start to deform without that.

Plugcheck · « **Reply #8 on:** September 24, 2015, 09:56:04 AM »

The "Feel" of my CVZ before and after replacing all the stringers and floor is unmistakable. Top speed has improved, but it is difficult to ascertain exactly which is more responsible since I went from a tired 198HP to around 350-375HP. I may actually put the 305(898) back in to see how it performs. Doran's CVZ appeared to perform admirably with a 305. Overall the flexing is gone, and it just feels so much more solid, especially in rough water. Most, if not all, my original foam was water logged. Seems like I remember weighing it all and removed over 200 lbs worth. It is a lot of work, but the results are worth the time, money, and effort.

Hyperacme · « **Reply #9 on:** September 24, 2015, 02:17:02 PM »

You have a cool and somewhat rare boat ...
Would be worth every penny you spend on it to restore it.
There has been many members who have restored CVX & CVZ 18's on this forum, so any question you have will get you answers.
If I remember right ... CVX18's don't even need the hull/deck split to do transom and floor.

75starflight · « **Reply #10 on:** September 24, 2015, 02:42:05 PM »

Quote from: Hyperacme on September 24, 2015, 02:17:02 PM

There has been many members who have restored CVX & CVZ 18's on this forum, so any question you have will get you answers.
If I remember right ... CVX18's don't even need the hull/deck split to do transom and floor.

Yes you can, I am doing it right now on my CVZ18. I would think a CVX would be a lot easier due to the fact you have a solid deck up front instead of the bow seats which you have to lift and support giving you just enough room to work.

Cali special · « **Reply #11 on:** September 24, 2015, 05:21:46 PM »

Everything is completeyrestored on my boat except stringers and transom and outer transome assembly. I did the floor but it didn't stick we'll to the side of the boat. Glastron used pL I just resined it and used fiberglass matting. I was still able to screw to the stringers but some screws popped out. Ever since I took it on lake George in rough water it just feels like nothing is holding it together..if u hit a small wave you'll lose a kidney

Cali special · « **Reply #12 on:** September 24, 2015, 05:50:42 PM »

That support under the bow? That's in front and behind on the tank? I didn't have a board wedged tight between the floor and bow. It looked like it had a piece if fiberglass matting folded in a loop that acted like a shock absorber. Has anyone tried to remake that. That's why I didn't put it back it. My horn was also glassed in. Where are u guys anchoring the horns?

CVX Fever · « **Reply #13 on:** September 24, 2015, 07:08:35 PM »

There is supposed to be a piece of 1/4 inch ply underneath the floor where it meets the hull. Did you put that spacer in there when you rebuilt the floor? They used a LOT of resin and glass matt at the factory on my boat where the floor attaches to the hull. That joint gives the hull a lot of strength.

My horn is screwed to the vertical piece of wood on the back of the tank(against the kick panel) that supports the deck/fuel tank. There two supports in front of and in back of the tank.

Hyperacme · « **Reply #14 on:** September 24, 2015, 07:14:55 PM »

My 1976 CV16 has a deck support in front and behind fuel tank, not sure if CVX18's have one or two ...
Both deck supports were glassed (mat and resin) solid to the hull and deck.

Sounds like it's time to redo everything (stringers, motor mounts, transom and floor).

Cali special · « **Reply #15 on:** September 24, 2015, 07:26:25 PM »

Ya I had both supports. Mabey the wood wasn't tight because it rotted. I'm gonna do everything. I'm not selling the boat. I'm in the boat bussiness we deal with a guy who does Gelcoat and structural work. He's been in a few boat plants. We do barta deals. He's already sprayed new gel on everything but the metal flake.

still_fishin · « **Reply #16 on:** September 24, 2015, 10:37:28 PM »

Or you could build one of these. I put this on my Intimidator to hold the fuel tank and support the deck since l'm not exactly a small guy these days. It is pretty much the same as the one that was on my '86 cvx 18 from the factory.

Cali special · « **Reply #17 on:** September 25, 2015, 07:34:06 AM »

My friend has 1986 cvx 18 it rides like a Cadillac compared to mine. My boat goes about 15 mph faster than his but even cruising around 25 mph. You can walk on the bow of his. That tank support turned helps a lot for strength and storage.

still_fishin · « **Reply #18 on:** September 25, 2015, 09:17:24 AM »

Before I put the support under the deck I wouldn't dare walk on the front.
One other benefit of the support, you turn the tank front to back instead of the factory side to side opening up lots of storage room on either side of the tank. When we camp for the weekend we stuff it full (skis, two knee boards, wake board, tent, bocce, air mattress, throwable, six life jackets, and misc others). And with boats like the Carlson's we need all the storage we can get.

CVX Fever · « **Reply #19 on:** September 25, 2015, 10:49:33 AM »

Quote

My friend has 1986 cvx 18 it rides like a Cadillac compared to mine.

Yep, Jeff's '86 CVX18 felt has always felt a lot more solid to me than my '79. In general it just feels like it's is laid up heavier/better. His doesn't have the waves in the deck like mine either.