Keel cooling design for electric inboard

It is simple. Run a pipe along the bottom/keel intersection. If you want it more streamlined, weld a plate of hat section over the pipe, which also makes it easier to attach. The pipe can either be bent at the ends to enter the hull or 90 degree elbows soldered to it.

 

Clearly I would like to see pictures, because when I read this I only imagine horrible design.
Many tight space for marine life to grow, seaweed to fix. Bended pipe who apply lever on the bulkhead, screws/fixation problems... really, I've hard time to imagine something nice.

I think I've found C11000 copper rectangle tube (40x20mm) on Ebay (china supplier).
That would allow me to build this little 6'' long copper cooler able to transfer over 30 000W of heat with only 20° C temperature difference between coolant and water.
So, two 15$ brass bulk head fitting + 70$ copper tube, that sound an affordable cooler solution to me. I need two.

 

Funny thing is, the simplest if often the most reliable.

Page 7. Carry on.