[Rhodes22-list] Re design of Rhodes Interior and elimination of compression post.

[John Shulick]

Rik,

 Thank you for sticking with me on this subject I see your point of view
much more clearly now. You got me 85% convinced and I find myself hoping
Stan sees this and chimes in as he is the pro and I am an armchair putz when
it comes to sailboat design.

John S


Rik Sandberg-2 wrote:
> 
> John,
> 
> "I understand the load on the stays increases with the reduction of
> mechanical advantage."
> 
> Agreed, and your suggestion of a step up in wire size is probably a
> prudent
> one.
> 
> "But doesn't the boat have a certain moment of inertia
> which must be over come for the boat to begin heeling. Or is that factor
> so
> low as to be meaningless in the calculation?"
> 
> All that is not really relevant to what you are talking about changing. To
> picture this in a simple way, imagine a brick sitting in your driveway.
> Now
> imagine you put a stick into one of the holes in the brick and pull on the
> top of the stick until the brick tips over. Would it make any difference
> in
> the amount of effort required if you took a string and tied it from the
> top
> of the stick to the outside of the brick?? No ... the only thing the
> string
> would do is help hold the stick in the same position, relative to the
> brick.
> The only way to change the effort required for this is to 1. change the
> length of the stick, which would represent changing the height of the
> center
> of effort from the sail plan. OR, 2. change the shape or weight of the
> brick, which represents the hull and it's ballast..
> 
> "Also do you have the background
> to calculate how much the load would be increased over the standard
> rigging?"
> 
> No, unfortunately I am "math" challenged. I am a backyard crowbar
> physicist.
> However, if Stan should see this, I have no doubt that he would tell you
> what I have said is right. He is a N/A and can do the math. Or you could
> ask
> someone like Brion Toss who is a well known expert sail rigger.
> 
> http://www.briontoss.com/
> 
> 
> Rik
> 
> 
> 
> On Mon, Apr 13, 2009 at 10:11 AM, John Shulick <jsbudda at verizon.net>
> wrote:
> 
>>
>> Hi Rik,
>>
>>  I understand the load on the stays increases with the reduction of
>> mechanical advantage. But dosent the boat have a certain moment of
>> inertia
>> which must be over come for the boat to begin heeling. Or is that factor
>> so
>> low as to be meaningless in the calculation? Also do you have the
>> background
>> to calculate how much the load would be increased over the standard
>> rigging?
>> I haven't done that type of math for 35 yrs.
>>
>> Thank you for your input
>>
>> John S
>>
>>
>>
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>>
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