Thru transom scuppers conversion from thru floor

[dcobbett]

I converted the through the bottom scuppers to through the transom scuppers when I put a new transom in my 1976 20 SF. I used short stubs of sink drain PVC from HD that fit into the lip on the back side of the rubber gasket for the PP ball cage. Inside the hull, I modified a fitting from Marine East http://www.marineeast.com/a_sch/sch_...d=05&pid=05_03
which was available in my area from West Marine, then joined the two fittings together with flexible hose rated for below the waterline use. Works great, but there was a lot of careful measuring and hole alignment work, a lot of added blocking behind and under the area of the through hull fitting, plus lots of cutting, filing and shaping of the fitting itself.

BTW, xing or criss crossing scupper drain lines has been around for a long time and I believe it started in sail boats to drain the lee side of the cockpit which would be at or below the actual water line when the hull was healed.

[image][/image]

[image][/image]

[image]http://[/image]

[image]http://[/image]

[image]http://[/image]

[image]http://[/image]

[Bryan A.]

BTW, xing or criss crossing scupper drain lines has been around for a long time and I believe it started in sail boats to drain the lee side of the cockpit which would be at or below the actual water line when the hull was healed.

Wouldn't that require water to run uphill??

[abl1111]

Aside from the Criss Cross idea; when you convert from thru floor scupper to thru transom, you gain a few vertical inches as to where the scupper exits the transom - right ?

But, you still need a product like the Rabuds or similar ?

I wish I had done this when I re-did my transom, but I had so much work on my plate, I let it go. Is it a be'atch of a job when all is together ? Again, I have a 23' Tsunami w/ an I/O - it's a little different.

There just is nothing good about the thru floor scuppers; it's to small to drain water quickly, it keeps the floor wet when weight is in the corner, and the brass tubes need replacing very so often.

I want 'em gone. But, only if it is a benefit to do so. Has anyone done a 23' ?

[htillman]

Use plastic drain tubes instead of metallic until you have time to convert. The plastic ones are available at Discount Marine. Most Seacrafts sold after 1976 used the plastic types.

[dcobbett]

abl1111,

The main reason I converted the scuppers on my project was that, as they were, they represented two uncontrolled holes through the bottom of the hull. I moore the boat and to my way of thinking, eliminating that potential disaster was a major benefit. I also plugged the fish box drain for the same reason, although the situation there is not as critical.

Regarding the crossing scupper drain piping, the lines are usually not laid flat or parallel to the water line; they slope down and generally back, often at a pretty steep angle (30^+/-).