We built our 9' plaining dink to self bail, until we stepped in. Then we had to quickly put in the plug.
One just puts in a lightweight, aft sloping floor, (like 1/2" Kledgacell), above the water line. Then put in a 6" square sump in the back, and have its walls connect to the hull with epoxy
fillets. Finally, a drain hole through the transom. There ya go!
We spent over a thousand hours on this one over 5 years. It was a "filler" project
that we turned to with downtime from the BIG boat project
. It was really slick and fast! It was even a decent row boat. It was however WET, especially when not on plane, like in a nasty chop.
Years later we got fed up and bought a light single
. It is a much better, DRIER boat. It is only inferior in that it is a pig to row. RIBS can't sink from rain water, and are easy to pump out. Self bailing would not be worth the weight of the extra floor model for us. (We do not have davits
, but an aft wing roller instead.)
Hard dinks make sense if you want a good row boat. Then keeping it light is really important. The double floor we built in ours, increased the weight by about 40%!
Just a thought,