[Rhodes22-list] Ballast ?

[Goodness]

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
>>> 
>>> 
>>> -- 
>>> View this message in context:
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>>> 
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>> 
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> 
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