Below the battery tray

[Grover70]

Does anyone know what is below the battery tray? If one were to drill a hole adjacent to the batteries would water drain into the bilge? The same for the starboard storage? I'm looking to add drainage and I can't see where it leads to.
Thanks!

 

[swatski]

EDIT: Sorry - sometimes I just can not help myself...
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[Grover70]

EDIT: Sorry - sometimes I just can not help myself...
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That's pretty funny though.

 

[Ronnie]

On the first gen yamaha 240s there is free air between the inner hull (that the battery/batteries sit on and the outer hull. How much space is questionable. I suggest you drill a small pilot in the inner hull and use an uncooked noodle to measure the distance to the outer hull. To answer you question anything under the inner hull in this area should follow the v of the hull and drain into the bilge area.

 

[Grover70]

On the first gen yamaha 240s there is free air between the inner hull (that the battery/batteries sit on and the outer hull. How much space is questionable. I suggest you drill a small pilot in the inner hull and use an uncooked noodle to measure the distance to the outer hull. To answer you question anything under the inner hull in this area should follow the v of the hull and drain into the bilge area.

If I understand what you are saying, anything that is below the upper deck should drain into the hull to the lower most point and follow the route to those two small drainage holes you can see if you remove the bait bucket holder and the clean out tray?

 

[swatski]

If I understand what you are saying, anything that is below the upper deck should drain into the hull to the lower most point and follow the route to those two small drainage holes you can see if you remove the bait bucket holder and the clean out tray?

Pretty much, with two caveats. One is floating foam - they do use it, per USCG, but where? - I don’t think we know. The other has to do with the bilge being the lowest point in the hull only when on plane or on a trailer - with the bow jacked up. Otherwise water will linger midship, somewhere inside the pseudo double hull.

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[highanddryinco]

Otherwise water will linger midship, somewhere inside the pseudo double hull...

...and seep in from the backside of your changing area floor drains if you haven't re-sealed those mounting flanges.

 

[Grover70]

...and seep in from the backside of your changing area floor drains if you haven't re-sealed those mounting flanges.

Fortunately I figured that out when all else had failed. It feels strange now having a dry changing room...

 

[Tailwaters]

I was thinking about the same thing. For some reason I thought I had looked up that direction recently to see about options for running the so called self draining channels for the battery hatch and seems to me there was a gap. I will be looking things over this weekend to start the channel drains so will take a look more closely.

 

[Grover70]

I drilled into the area between the batteries and it was very thick. I get the feeling that is where there is foam or other insulation. So, I just filled it back up with silicone and sighed.

 

[Tailwaters]

Did you try looking up that way through the access panel in the swim platform? I think if it's supported it's go to be on pads and not solid? I could be wrong but that's the way the bulk of the liner I supported. So you could have simply just drilled into the wrong spot. I'll be working on my drains this weekend so I'll take a closer look

 

[Grover70]

Did you try looking up that way through the access panel in the swim platform? I think if it's supported it's go to be on pads and not solid? I could be wrong but that's the way the bulk of the liner I supported. So you could have simply just drilled into the wrong spot. I'll be working on my drains this weekend so I'll take a closer look

I hadn't thought about that. I think I just got nervous. Yeah, let me know what you see. It's never too late to drill again!

 

[Tailwaters]

Well I had just a few minutes this afternoon to take a look at the battery compartment. Based on what I can see the liner goes back into the swing platform area. May have to pull one of the starboard panels behind the battery to see if there's and gap. As you can see by the photo there's a raised area behind the battery compartment. Yamaha liner system is very odd.

 

[Grover70]

When I drilled the decking it almost looked like particle board fragments were underneath. It was hard to tell with the fiberglas debris mixed in.

 

[Tailwaters]

I hope there's no particle board under there. I can't imagine that there would be any wood at all. I'm assuming the stringers are all glass and foam filled but to be honest I can't tell what is what inside this boat. If I had to guess the hull is layed up and the stringers which are part of the liner system are glued/glassed into place?

 

[dlkhmk]

I can confirm that there is wood used in our boats. Not sure of the location in this thread, but during my cup holder install I found that the small steps up towards the bow are a combination of 1/4” fiberglass with a 1/2” of a balsa wood like material sandwiched in between. I’m assuming it’s used in certain areas to thicken the deck, hatches, and for sound deadening. But that’s just my guess.

 

[Tailwaters]

Balsa is a standard product used to add thickness and strength without added unwanted weight so that's no surprise. Just need to be careful to seal any exposed balsa. Even though balsa is laid in end core water can be absorbed into the raw sections and eventually cause delamination. Not very common above the waterline but non-the less can happen

 

[Stevenpigsooie]

I drilled into this area last week while installing an on board charger. There was definitely appearance of wood on the drill bit. I was careful while drilling through the other side not to plunge then slowly passed a long plastic tube through the hole. Directly beneath where I drilled there was nothing. About 3 inches below the floor it felt like a dense foam. I filled the holes with caulk then the screws securing the charger

 

[Tailwaters]

If you had 3" of foam my guess is you hit a stringer that is foam filled. I know there is a raised area on the engine side of that compartment that looked as if it maybe a stringer.

 

[Stevenpigsooie]

I meant there was free air space directly beneath the battery compartment floor until roughly 3 inches below it then I felt the foam.