[Rhodes22-list] Ballast ?

[John Shulick]

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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