[Rhodes22-list] Ballast ?

[John Shulick]

I see your point and will try this prior to drilling holes 


Spreadgoodnews wrote:
> 
> I think this does work pretty well.  The watertribe, everglades challenge
> people do some pretty cool stuff.  The sea-saw analogy is close, but
> weight above waterline has more effect than weight below waterline when
> heeling the windward weight will be clear of the water. Plus i am talking
> about putting it way out on the sides of the hull.  Centerline weight
> offers little righting moment until a certain amount of heel is present. 
> This is part of the reason twin keel boats  are very very stable.
> 
> 
> 
> On Jan 23, 2012, at 10:15 PM, John Shulick <jsbudda at verizon.net> wrote:
> 
>> 
>> Goodnews,
>> 
>> Thought experiments are good way to pass the time till sailing season
>> begins. The daggerboard with a torpedo would require extensive trunk
>> modification and some inventive engineering not to mention serious
>> dollars
>> which I can't allocate for now. I have a rough design in my head but
>> still
>> need to solve a few problems before going that far. The first thing to do
>> is
>> close the slot temporarily with a plastic strip with the centerboard down
>> and measure performance. I will do that when the water warms enough to go
>> swimming this year. I understand your idea of moving the extra weight out
>> to
>> the sides but wouldn't equal weight placed there cancel out? Picture a
>> see
>> saw with a 100 kid on each side. If I put the ballast inside it would be
>> along the centerboard trunk so when the boat begins to heel the gravity
>> will
>> try to re center the boat. Bolting the ballast to the bottom of the keel
>> gives a 2' mechanical advantage. Putting holes in the shoal keel and
>> sealing
>> them are not a big deal to me, I worked in the swimming pool business for
>> 30
>> yrs. so I am wise to water and its ways. Actually a boat is novel to me I
>> always had to keep the water in something now I'm trying to keep the
>> water
>> out of something. Ironic really.
>> 
>> John S
>> 
>> 
>> Spreadgoodnews wrote:
>>> 
>>> I like your cognitive rumination.  I like your idea to play with some
>>> extra ballast.  Having a torpedo centerboard with the weight would be
>>> good
>>> because you can reverse it by putting your 70# diamondboard back in. 
>>> But
>>> you may need to add a winch and some stainless cable to lift a 200#
>>> board.
>>> As an alternative, try the physics of this idea.  In fact its not my
>>> idea
>>> but was on one of the participants of everglades challenge.  Put the
>>> weight equally divided on each side.  Under the port settee and under
>>> the
>>> galley against the hull outside the fore and aft stringers, not
>>> centerline.  Use coated lead shot weights like ankle weights or dive
>>> weights.  The idea is that as the hull heels you cantelever the weight
>>> out. The rhodes hull shape would make this work exceptionally well to my
>>> eye.
>>> 
>>> 
>>> 
>>> On Jan 21, 2012, at 9:14 PM, John Shulick <jsbudda at verizon.net> wrote:
>>> 
>>>> 
>>>> Slim, Lee, Goodnews,
>>>> 
>>>> I understand that I may not gain much and that I may end up removing
>>>> them
>>>> a
>>>> week after putting them on but how do you figure 200 lbs ballast would
>>>> court
>>>> a potential catastrophe ? I have considered putting the weight in the
>>>> hull
>>>> but bolting it to the bottom of the shoal keel would add considerable
>>>> mechanical advantage over just sticking it under the floorboards. I was
>>>> mistaken in my calculation of increase in whetted area it should have
>>>> been
>>>> 288 sq/in or ~ 2 sq/ft still just not that much IMO. It would be like
>>>> having
>>>> an extra invisible crew member who always knows when to switch sides.
>>>> If
>>>> 200lbs of ballast is such a radical mod, here's another thought. How
>>>> about
>>>> chucking the swing centerboard and replacing it with a retractable
>>>> dagger
>>>> board with a lead torpedo at the bottom? That would eliminate the open
>>>> slot
>>>> in the hull which I believe to be a major drag component. Phillip
>>>> Rhodes
>>>> did
>>>> not design boats in the modern era of computer modeling and space age
>>>> materials. I wonder how he would build the R22 today ? 
>>>> 
>>>> Tinkerers of the world UNITE !
>>>> 
>>>> JohnS
>>>> 
>>>> 
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>> 
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> 
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