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Guys I bought a 1977 sanger super jet last summer and there is something about it that bothers me and maybe Im jus crazy (don't know). Thing is when I first took the boat out on the water it was a lil differen't for me being that it was my first jet boat,but not my first boat or hp 454 to play with. My concern is of the hull right under your feet you can feel the hull flex when you hit waves hard in this area. Also when the boat is on the trailer you can see the hull is flexed upwards a lil in this area due to bunk pushing it up. Is this something bad or what. Boat does not have a place diverter yet so you have no trim to get on the back pad either and I thought this may be the problem? I can take pics if needed. Please Help!!
 

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Dead glass?

I can't really say from a lot of experience, but I had some areas in my old hull that were like that. I could shine a strong light on it and see places where the resin was not very solid- instead of clear looking, it was white/opaque. I uncovered these places when redoing the stringers/floor/ engine mounts. My weight standing on it would flex it. I didn't like it- so I ground down to clean glass and laminated it with several layers of new material. If it is flexing when you ride- and you can feel it- it sounds like the bottom integrity is not so great. If it is doing it just sitting on the bunks, then you might check the hull for hook and rocker. Mine had a hook that could catch fish.
I would have to say if I encountered the same thing in a hull again, I would start looking for a hull that was solid to start with. The sort of work that it takes to bring back those old hulls will kill a man.
 

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Guys I bought a 1977 sanger super jet last summer and there is something about it that bothers me and maybe Im jus crazy (don't know). Thing is when I first took the boat out on the water it was a lil differen't for me being that it was my first jet boat,but not my first boat or hp 454 to play with. My concern is of the hull right under your feet you can feel the hull flex when you hit waves hard in this area. Also when the boat is on the trailer you can see the hull is flexed upwards a lil in this area due to bunk pushing it up. Is this something bad or what. Boat does not have a place diverter yet so you have no trim to get on the back pad either and I thought this may be the problem? I can take pics if needed. Please Help!!
It could just be a light lay up hull, IF it is a light lay up the flexing would be normal (and strong).
The hull flexing upwards while on the trailer is a whole different deal as even a light lay up hull doesn't sit funny on the trailer/bend while on the trailer.
Let's see some pics of the boat. Does the hull have full or 1/4 stringers? Put a 4' (at least) straight edge on the bottom center of the boat (the keel) and find out what's going on with the keel (is it flat, concave, bowed, etc...).
Jet boats aren't required to have trim systems, most race boats don't have them, and most jet boats didn't have them when they were new.
 

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are you pulling the nose of the boat down on the trailer with a winch or is it freely hooked at the bow eye? sounds like the stringers might be rotten if its flexing alot. bunks can be as high as they want to be. boat should sit on top of them unless your pulling the bow down.
 

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i can feel my big ol cruiser flex right there sometimes, trips me out but over the years i've grown to think it's normal...or maybe it's the two fully loaded ice chests under the bow? take pics for the other prob
 

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It could just be a light lay up hull, IF it is a light lay up the flexing would be normal (and strong).
The hull flexing upwards while on the trailer is a whole different deal as even a light lay up hull doesn't sit funny on the trailer/bend while on the trailer.
Let's see some pics of the boat. Does the hull have full or 1/4 stringers? Put a 4' (at least) straight edge on the bottom center of the boat (the keel) and find out what's going on with the keel (is it flat, concave, bowed, etc...).
Jet boats aren't required to have trim systems, most race boats don't have them, and most jet boats didn't have them when they were new.
It would be very surprising to me to see a light layup in a actual Super Jet. Can we see some pictures it does help alot !
 

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With the exception of Sanger V-drives and My Sanger Circle boat (one off) all the Sanger Jets including the Super jets and Sprint jets I've ever seen are 1/4 stringer /motor box construction , They (Sanger) achieved hull "structure and integrity" by attaching/laminating the plywood Sub Floor down across the inside of the hull at the right and left side "voids' left by the the strakes and a center reinforcing rib . If the floor begins to rot or delaminates at the edges the boat can display that torsional twisting (squirming) like you describe (especially in turns) My brother in law had a 18' Tahiti the felt like a corkscrew in turns ,turned out the floor had come loose from the bottom Recommend you check the floor at the edges (about midships) Call if we can help Tom
full stringer

1/4
 

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Tom is the man

Listen to Tom at JBP, it makes sense. Where's the pics?
you have to give props to anybod who will give out their personal cell number to anybody who needs help.
 

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Discussion Starter #11
Ok thanks guys for the helpful info! I have been working a shutdown and haven't had time to take pics but I will soon. I think my sanger is a 1/4 stringer, and after looking further I found that on the right side the hull is not being pushed up like left side is, and it is not tied down with a winch strap. It has the pin type hook on front that moves up and down with boat. When you tap on the hull in this area it sounds very thick and sound. I haven't checked under carpet yet to see what is under there but I will soon after this shutdown I am on and take some pics to post. again thanks
 

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Discussion Starter #17
Ok, I pulled back carpet only to find a crack in some wood about 12" from edge of the boat just in front of drivers seat. Looks a little better on passenger side but still a crack. Hull on bottom sounds good when you tap it and area behind the front seats sounds good. What is the process of repairing this kind of rot. Any help would much be appreciated.
 

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Ok, I pulled back carpet only to find a crack in some wood about 12" from edge of the boat just in front of drivers seat. Looks a little better on passenger side but still a crack. Hull on bottom sounds good when you tap it and area behind the front seats sounds good. What is the process of repairing this kind of rot. Any help would much be appreciated.
If the crack is where the wood meets the fiberglass you might get away with putting some glass in and on the crack. If the crack is in the wood then you probably should replace the floor. If the crack is in the fiberglass then it can't wait and needs to be repaired. Where's the crack?
 

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Discussion Starter #19
its hard to see it in the picture but this is right underneath the steering wheel. There is wood under this area but not sure where it ends at.
 

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The last one of these I had was in a SJ already sold to a customer, I noticed every day (while the boat was setting indoors waiting for pickup) , a Tiny drip of water in the Chine just under the drivers seat , closed inspection revealed a longtitudinal crack in that strake area When we had our Glass guy pull up the floor he found about 24" if lenghtways crack in that spot It was succesfully repaired and reinforced from the top and a new floor/structure laminated back down (took a big bite $$$ from our profit ;)) customer's still driving the boat today :)coffee Tom
 
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