[bolger] Re: Water ballast---
Hi John - I wonder how much solid ballast a martha jane will float without
foam. I did put a bunch of foam in - temporarily - as I await the response
from mr.b. I hope to go sailing tomorrow - saturday - I wonder if 800 lbs of
ballast is going to feel any different from the 500 I had before.
Hope you're doing well - any update on the shoulder? Steve
foam. I did put a bunch of foam in - temporarily - as I await the response
from mr.b. I hope to go sailing tomorrow - saturday - I wonder if 800 lbs of
ballast is going to feel any different from the 500 I had before.
Hope you're doing well - any update on the shoulder? Steve
hwa-@...wrote:
original article:http://www.egroups.com/group/bolger/?start=3706
comfortable reserve buoyancy there's no need", and that means after you
put in another 200 lbs or three tons or whatever amount. Select a
number for comfortable reserve and go from there with foam if necessary
to achieve it.
Adding ballast (solid or water) is going to reduce reserve buoyancy as
you demonstrated by swamping! That sure reduced it, but she still
floated - barely!?. Let's keep things in context. There is no reason
for 500 pounds of sand bags to drag her down to the bottom any more
than the 500 pounds of the water they replaced inside of the sealed
ballast tanks. If the tanks were not water tight as they should have
been, any water seeping into the tanks with the sand would replace air
in the tanks and eliminate that much buoyancy.
<(And .... It's not tweaking - it's jovial friendship!)>
I never took it any other way - that's what I was doing! John
original article:http://www.egroups.com/group/bolger/?start=3706
> So John - If I have 700 lbs of solid ballast you don't think foam isneeded
> to keep her from sinking in the event of another swamping? I willtell you
> that I had a few moments back then when I wondered if my sand bagswere going
> to drag her down to the bottom 9 feet down.>Hi Steve, That is not what I said. The key words were "with
comfortable reserve buoyancy there's no need", and that means after you
put in another 200 lbs or three tons or whatever amount. Select a
number for comfortable reserve and go from there with foam if necessary
to achieve it.
Adding ballast (solid or water) is going to reduce reserve buoyancy as
you demonstrated by swamping! That sure reduced it, but she still
floated - barely!?. Let's keep things in context. There is no reason
for 500 pounds of sand bags to drag her down to the bottom any more
than the 500 pounds of the water they replaced inside of the sealed
ballast tanks. If the tanks were not water tight as they should have
been, any water seeping into the tanks with the sand would replace air
in the tanks and eliminate that much buoyancy.
<(And .... It's not tweaking - it's jovial friendship!)>
I never took it any other way - that's what I was doing! John
In a message dated 3/15/2000 6:47:43 AM Eastern Standard Time,
gertyjandp@...writes:
<< And I agree with you that with
comfortable reserve buoyancy there's no need to add foam to make the
boat unsinkable. >>
So John - If I have 700 lbs of solid ballast you don't think foam is needed
to keep her from sinking in the event of another swamping? I will tell you
that I had a few moments back then when I wondered if my sand bags were going
to drag her down to the bottom 9 feet down. I have ( temporarily - until we
hear something from mr. b) put enough foam in to float about 600 lbs - I am
certain that it's all in the wrong places - at this point - under the bow
well and under the cockpit sole - I was going to epoxy some foam under the
cockpit seats instead of under the cockpit sole - but don't want to do
anything permanant yet. But having added 200 more pounds of ballast I just
want to make good and sure that she can't possibly go to the bottom in a
worst case scenario - even if she's floating on her side or upside down or on
her nose. The key - of course - is keeping water out of the inside of the
boat. I'm sure that without water inside - and with 700 lbs of ballast she'll
be rightside up now. (And .... It's not tweaking - it's jovial friendship!)
Steve
gertyjandp@...writes:
<< And I agree with you that with
comfortable reserve buoyancy there's no need to add foam to make the
boat unsinkable. >>
So John - If I have 700 lbs of solid ballast you don't think foam is needed
to keep her from sinking in the event of another swamping? I will tell you
that I had a few moments back then when I wondered if my sand bags were going
to drag her down to the bottom 9 feet down. I have ( temporarily - until we
hear something from mr. b) put enough foam in to float about 600 lbs - I am
certain that it's all in the wrong places - at this point - under the bow
well and under the cockpit sole - I was going to epoxy some foam under the
cockpit seats instead of under the cockpit sole - but don't want to do
anything permanant yet. But having added 200 more pounds of ballast I just
want to make good and sure that she can't possibly go to the bottom in a
worst case scenario - even if she's floating on her side or upside down or on
her nose. The key - of course - is keeping water out of the inside of the
boat. I'm sure that without water inside - and with 700 lbs of ballast she'll
be rightside up now. (And .... It's not tweaking - it's jovial friendship!)
Steve
Hi Ed, (I'm still trying to figure out the 'reply'procedure.)
The words attached to your No.3691 addressed "Hi Peter" sure sounded
familiar - typo and all! Now I know! And I agree with you that with
comfortable reserve buoyancy there's no need to add foam to make the
boat unsinkable. Foam up high might help right a turtled boat or
outside the gunnels add resistance to the last stage of a knockdown -
like sponsons on a canoe? I doubt that is worth the trouble for most of
us. As you can see from my musings Zephyr might not benefit from adding
lead unless I reduced some of the incidental ballast Steve likes to
tweak me about. I have, um, well, ample depth, and she sails well.
John Gerty
Martha Jane "Zephyr"
The words attached to your No.3691 addressed "Hi Peter" sure sounded
familiar - typo and all! Now I know! And I agree with you that with
comfortable reserve buoyancy there's no need to add foam to make the
boat unsinkable. Foam up high might help right a turtled boat or
outside the gunnels add resistance to the last stage of a knockdown -
like sponsons on a canoe? I doubt that is worth the trouble for most of
us. As you can see from my musings Zephyr might not benefit from adding
lead unless I reduced some of the incidental ballast Steve likes to
tweak me about. I have, um, well, ample depth, and she sails well.
John Gerty
Martha Jane "Zephyr"