Jeanneau SO 49 construction

[bri]

Hi all,

I just bought the Jeanneau SO 49 from 2005 I have been looking at, and asked the ship yard to change the valves in the bottom.

Unfortunately they did that by an angle grinder, by basically just pressing it up vertically from outside (you would normally cut it horizontally). That now means that my "new" boat has some cuts in the bottom fiber. Firstly I believe this is completely stupid, but unfortunately it now is what it is, and they can start to repair what they did.

Hereby a picture:


www.23hq.com/bribri/photo/52168069/original

My question to the bottom of a Jeanneau SO 49, how is that made. In the bottom of the hull I would expect solid laminate?! Or ?

Would anyone know any different? I took a picture of the bottom, and it seems that there is the gelcoat layer, some kind of fiberlayer, and a thick layer of other fiber.

I that something like gelcoat, vinylester layer, and polyester layer ?

On the picture though, it seems that there is something in the middle, but it may be the picture. I guess no one would construct a sailboat with sandwich construction in the bottom ?

Let me know if anyone knows how this is constructed usually from Jeanneau.

Best regards

Bri

[MartyB]

Granted I have a boat from 85, that is how my thru hulls looked after I removed the mushroom fittings. I was a bit more cautious on how deep I went into the gelcoat with the angle grinder. I also went with Forespar Marlon flush fittings vs mushroom and or metal based fittings.
My hull is probably thinner too being as I am smaller in length etc.

Marty

[theswede]

It's probably not solid, usually cored but the pic is not clear enough to asses what the core material is. If it's soft it's likely balsa or similar but from the install I don't think Jeanneau would have mounted the valves like they did if it were balsa. Google cored hulls to learn more and help you figure out what it is or try asking Jeanneau directly. 


 

[johannes]

According to this article it is a solid laminate:

www.boatsales.com.au/editorial/details/jeanneau-sun-odyssey-49-and-sun-odyssey-49-deck-saloon-8669/

like all Jeanneaus of that generation. Modern cruising designs usually don't have cored laminate below the waterline, although some may have above.

[bri]

Hi and thanks for your replies. It seems that it is solid, and maybe the picture is a bit misguiding.

The thru hull is not made by jeanneau, that is also what concerns me.

The first layer is for sure gelcoat, the second I maybe suspect to be laid with Vinylester?! It seems like the second layer is made before the 3'rd layer. I would be suprised if anyone is using sandwich below the water ?  

[Trevor]

Hello Bri,

I know my yacht is a 42DS and yours is much larger but this is the core of my yacht when I faced a moment of truth and drilled a hole for the watermaker input. I am sure many layers are involved but it looked solid to me.

Regards,

Trevor


www.23hq.com/yachtbird/photo/52688269/original

[achosenman]

Mar 6, 2019 21:07:48 GMT theswede said:

It's probably not solid, usually cored but the pic is not clear enough to asses what the core material is. If it's soft it's likely balsa or similar but from the install I don't think Jeanneau would have mounted the valves like they did if it were balsa. Google cored hulls to learn more and help you figure out what it is or try asking Jeanneau directly. 


 

The first thing that comes to my mind is why are you using angle grinders?

With a hole saw it takes about 1 minute to remove each through hull with no damage. Cut a bit of batten or wedge to fit across the orifice to accept the pilot drill. Then a standard 18v drill with the correctly sized hole drill will remove the flange from the through hull and let you remove the fitting with no gel coat damage.