Cutaway transom or not?
 

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.

Cutaway transom or not?
 

On Jun 23, 3:34*pm, 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 (Renn 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.

In either case, the cabin entrance should have a high step to get over
to prevent water from going below. This seems sorta a pain but
necessary. Many sailboats are built with such a step (bridgedeck) to
prevent water from going below if the cockpit floods. In addition, in
nasty weather, I keep the bottom hatchboard in place. Maybe such a
hatchboard would help on offshore boats with cabins? What is done on
such boats to prevent water from going into the cabin?.

Cutaway transom or not?
 

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.

Cutaway transom or not?
 

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?

Cutaway transom or not?
 

Frogwatch wrote:
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?


The cabin parker I owned had a step down cabin...the sides and stern
were so high, it would have taken a tsunami to get any water inside the
cabin. Plus the cabin had drains and pumps in the floor, so when I
cleaned the boat out, I hosed out the surface decks after using a bucket
of soapy water on them.

The 21' parker cabin boat uses the same hull as my CC. It doesn't get
much water in it. SW Tom's "mighty" bay boat is maybe, and I mean maybe,
2/3's the height at the bow and along the sides as my smaller Parker. I
would say it would fit inside my parker, but I'm not sure of its width,
since that model Ranger was not a marketing success and is no longer made.

Cutaway transom or not?
 

On Tue, 23 Jun 2009 16:47:46 -0400, Gene Kearns
wrote:

How does the Parker keep water from in doors. Once any significant amount of water down floods the cabin, the boat is usually a goner. You just can't get it out fast enough and the loss of stability/risk of capsize is severe.

Taking water over the bow is usually caused by encountering a high,
steep wave where the bow can not rise quickly enough. Water over the
transom can be caused by a breaking wave from astern. It happens on
offshore sailboats all the time. It can put a *lot* of water in the
cockpit in no time at all. The other big issue with water over the
transom is "accidental" anchoring from the stern, frequently caused by
snagging a crab trap or similar. The guys from St Pete Beach whogoing
into the cabin?

Don't know about Parker but as you mentioned the answer is some sort
of significant bridge deck combined with decent cab capsized last
winter were trying to pull an anchor out from the stern, another big
no-no.

Cutaway transom or not?
 

On Tue, 23 Jun 2009 19:57:30 -0400, Wayne.B
wrote:

On Tue, 23 Jun 2009 16:47:46 -0400, Gene Kearns
wrote:

How does the Parker keep water from in doors.

OK, let's try to unscramble this mess:

Don't know about Parker but as you mentioned the answer is some sort
of significant bridge deck combined with decent cabin doors. Once a
signicant amount of water downfloods the cabin, the boat is usually a
goner. You just can't get it out fast enough and the resulting loss
of stability/capsize risk is severe.

Taking water over the bow is usually caused by encountering a high,
steep wave where the bow can not rise quickly enough. Water over the
transom can be caused by a breaking wave from astern. It happens on
offshore sailboats all the time. It can put a *lot* of water in the
cockpit in no time at all. The other big issue with water over the
transom is "accidental" anchoring from the stern, frequently caused by
snagging a crab trap or similar. The guys from St Pete Beach who
capsized last winter were trying to pull an anchor out by the stern,
another big no no.

Cutaway transom or not?
 

On Tue, 23 Jun 2009 19:57:30 -0400, Wayne.B
wrote:

On Tue, 23 Jun 2009 16:47:46 -0400, Gene Kearns
wrote:

How does the Parker keep water from in doors. Once any significant amount of water down floods the cabin, the boat is usually a goner. You just can't get it out fast enough and the loss of stability/risk of capsize is severe.

Taking water over the bow is usually caused by encountering a high,
steep wave where the bow can not rise quickly enough. Water over the
transom can be caused by a breaking wave from astern. It happens on
offshore sailboats all the time. It can put a *lot* of water in the
cockpit in no time at all. The other big issue with water over the
transom is "accidental" anchoring from the stern, frequently caused by
snagging a crab trap or similar. The guys from St Pete Beach whogoing
into the cabin?

Don't know about Parker but as you mentioned the answer is some sort
of significant bridge deck combined with decent cab capsized last
winter were trying to pull an anchor out from the stern, another big
no-no.

I keep waiting for an explanation as to why Parker developed and sells
the 'transom cutout dam' to keep the water from coming in through the
stern. Wouldn't the damn dam also keep the water from going OUT the
stern?
--

John H

Cutaway transom or not?
 

On Tue, 23 Jun 2009 20:30:49 -0400, John H
wrote:

I keep waiting for an explanation as to why Parker developed and sells
the 'transom cutout dam' to keep the water from coming in through the
stern. Wouldn't the damn dam also keep the water from going OUT the
stern?

But if it doesn't come in, it doesn't need to go out...

I suppose there might be a few timidly souls out there, or their
wives, that might be somewhat unnerved by the sight of a wave coming
in through the transom cut out. There's a reason why stern brackets
have become popular on offshore outboards.

Cutaway transom or not?
 

On Tue, 23 Jun 2009 20:56:16 -0400, Wayne.B
wrote:

On Tue, 23 Jun 2009 20:30:49 -0400, John H
wrote:

I keep waiting for an explanation as to why Parker developed and sells
the 'transom cutout dam' to keep the water from coming in through the
stern. Wouldn't the damn dam also keep the water from going OUT the
stern?

But if it doesn't come in, it doesn't need to go out...

I suppose there might be a few timidly souls out there, or their
wives, that might be somewhat unnerved by the sight of a wave coming
in through the transom cut out. There's a reason why stern brackets
have become popular on offshore outboards.

I agree. But, why does Parker make the dams if the cutout is such a
great idea?
--

John H