Super Jet Square Nose 650 side wall deformation ?!

S

SurfSleepRepeat

Location
Greece
Hi all,
This is my first post on this forum.
I have recently purchased a Superjet 650 from 1992 which i plan to start rebuilding.

My concern is about the ride tray floor and the side wall (on the right side).
it looks like the side wall is bent inwards (see pictures) and the floor has a bump (see pictures)

I wonder how this could have happened and what is the best method to repair it.
Any ideas would be much appreciated.

Phil
 

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Sanoman

Sanoman

AbouttoKrash
Location
NE Tenn
Possible it has been exposed to heat? A set of footholds would take care of the gunwales.The tray bottom a bit more involved.Do you know any history about the ski?

And welcome to the X!
 
mikidymac

mikidymac

Location
California
Watching this one. Friend of mine has a RN that looks the exact same on the outside wall. We cut into it and the foam was completely dry and bright. No traces of water or yellowing of the foam.


Sent from my iPhone using Tapatalk
 
Sanoman

Sanoman

AbouttoKrash
Location
NE Tenn
mikidymac said:
Watching this one. Friend of mine has a RN that looks the exact same on the outside wall. We cut into it and the foam was completely dry and bright. No traces of water or yellowing of the foam.


Sent from my iPhone using Tapatalk
Click to expand...
Interesting.Exposure to heat? (refer back to lack of knowledge about SN’s)
 
S

SurfSleepRepeat

Location
Greece
Thanks to everyone for their thoughts !

Sanoman said:
Possible it has been exposed to heat? A set of footholds would take care of the gunwales.The tray bottom a bit more involved.Do you know any history about the ski?

And welcome to the X!
Click to expand...

I don't know much about the history of this Yam as I bought it from an old man who had it sitting in his warehouse for more than 10 years. By the looks of it doesn't seem to have had much use.
You are probably right, I also suspect the ski must have been left in direct sunlight for a long time.
it has probably caused the foam inside to shrink and "deck wall" to collapse ?
Not sure what could have caused the bump on the bottom of the tray though.....:rolleyes:

Ideally, i would like to avoid having to cut into the fiberglass and keep the ski as stock as possible. I was thinking to open a 10cm hole into the inside wall and try to hit the outside wall from inside with a wooden pole to see if it pops back in place. If it does, i would spray a can of expanding polyurethane to fill the gaps from the shrunk foam thus preventing it to collapse again.
Don't know if it will work... has anyone tried this technique ?
 
S

SurfSleepRepeat

Location
Greece
SmittySX said:
A very common problem with the square noses. You probably have wet foam.
Click to expand...

Hi, I don't think the foam is wet... I weighted the bare hull (no engine no hood no jetunit no handpole)
it weighs 49 kilograms (108 Lbs if i'm not mistaken)
btw how much a bare SN hull is supposed to weight ?
 
hornedogg79

hornedogg79

dodgin' bass boats
My carbon f1pro was the same. Looked terrible down the gunwales. Soon as a removed the shrunken 2part foam it sprung back to shape and looked perfect.

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C

Crashcourse316

Location
Michigan
The foam sticks very hard to the side walls, If that foam shrinks inside from slowly melting in the sun the walls themselves are very flexible and will just suck in with the foam. I just cut up my tray a few weeks ago and the side walls are like a floppy noodle when by themselves with no backing. I think your Idea to try and pop it out with a wooden rod may be a good attempt but You would probably be surprised at the holding strength on that foam. You may end up drilling several holes to get it all unstuck from the foam so that you can push it flat and fill in the gap, that is assuming you can even break the side wall loose from the foam.

My guess would be that you would have to cut out the entire area that is collapsed on the inside of the tray and peel it away from the foam, then rip out enough foam to get the outside to be back to the correct shape, then epoxy/glass the wall back into place and pour the 2 part into a small hole and tape over it so that it expands and forces the walls back out.
 
S

SurfSleepRepeat

Location
Greece
Crashcourse316 said:
The foam sticks very hard to the side walls, If that foam shrinks inside from slowly melting in the sun the walls themselves are very flexible and will just suck in with the foam. I just cut up my tray a few weeks ago and the side walls are like a floppy noodle when by themselves with no backing. I think your Idea to try and pop it out with a wooden rod may be a good attempt but You would probably be surprised at the holding strength on that foam. You may end up drilling several holes to get it all unstuck from the foam so that you can push it flat and fill in the gap, that is assuming you can even break the side wall loose from the foam.

My guess would be that you would have to cut out the entire area that is collapsed on the inside of the tray and peel it away from the foam, then rip out enough foam to get the outside to be back to the correct shape, then epoxy/glass the wall back into place and pour the 2 part into a small hole and tape over it so that it expands and forces the walls back out.
Click to expand...

Great info !! thanks. I will try it in the next couple of days
 
jetfreak78

jetfreak78

Location
north east germany; island "usedom"
My SN had the same deformations on both sides. Removing the foam didn't help any, the dents were still there. Even Refoaming with expanding two Part foam did not pop the dents out. So good luck with your idea, I don't think it will help any...
I ended up with filling the dents with body filler before paint...
 
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