On Jun 23, 4:18*pm, HK wrote:
Frogwatch wrote:
YES, I'll start a real flame war here but I am serious about the
question.
HK says a cutaway transom allows the boat to drain if it is swamped,
seems sensible.
The designer of my Tolman says to have a high drywell in front of the
motor on a cutaway to make sure she does NOT fill with water.
A compromise seems to be to have the dry well but also have serious
cockpit drains, not the tiny ones you see on most boats, I mean at
least 6" diameter AND have the cockpit drains with flapper valves made
of thick rubber sheet attached to the transom with SS screws. *This
would require the boat be decked with floatation underneath.
I am curious because I am considering in the long term what boat to
build next and am considering a modified 23' Tolman Jumbo with more
deadrise.

The problem with a "high drywell," as you call it, is that if you take a
big wave over the bow or over the sides, the water will have to be
higher than that "high drywell" to get over it. The scupper drains at
the bottom aren't going to do for serious green water. I think the
larger, semi-horizontal scupper drains are more effective.

In all the years I have been messing around in small boats, I have never
taken any serious amount of water over the stern, and that includes
boats I have had with 15" and 20" transom heights. When waves come to
the stern, the boat usually rises enough to keep water out.

*From 2002 to 2003, I had a SeaPro "bay boat" with stern seats and a
transom water dam. I never took any significant water over the stern,
but I did take a decent sized wave over the bow. It took a while to
drain the water out the scuppers.

Before that, I had another SeaPro, but it had only two stern seats, no
transom water dam. One fine day we were anchored close to the beach just
north of Mayport when the wind shifted, and some big waves began
breaking just in front of and and the bow of the boat. We took two
substantial waves right over the bow, and I thought I was going to lose
the boat. But I was able to cut the anchor line in a flash, start up the
engine, and get the water to the stern, where it poured right over the
transom.

There are a few assholes here who will argue otherwise, but their
problem is with me, not with the boat design. A couple of them have
absolutely no big water experience.

Before I build the Tolman Jumbo, I will probably modify my 20' with
large drains and a removable deck with foam underneath. I worry about
foam absorbing water so I want it to be removable. One advantage of
the Tolman is the very high bow making it unlikely to take water over
it but you never know.
How does the Parker keep water from going into the cabin?