[Rhodes22-list] sailing sense #2 or something you already know

[Rik Sandberg]

Hank,

I'm no engineer, but I understand leverage. Moving the upper shrouds in 
towards the mast is going to decrease the leverage the shrouds have now, 
dramatically. Moving them next to the mast (as Jim suggested) would 
remove that leverage almost completely and the vertical forces at the 
foot of the mast and the connecting point of the shroud would raise 
almost to infinity, certainly beyond the capabilities of the fiberglass 
cabin top.

The shroud holds the stick straight, but it also holds it vertical. It 
does that by generating vertical force, upward at the chainplate and 
downward at the foot of the mast/cabin top, like a big, L shaped 
crowbar. Narrowing the footprint of the upper shrouds is going to 
require a good deal more engineering than just bolting a chainplate to 
the side of the cabin.

I can imagine that such a thing could be done, but it would probably 
require a heavy bulkhead, or something similar, inside the cabin to 
spread the forces back out to the hull.

Rik

Ayn Rand was a prophet - - it isn't my fault



Hank wrote:
> I would think that moving the attachment point for the upper stay inward
> would weaken the system and make it more likely that the mast could fail in
> strong winds or in a blow over type event.  Especially if the connection
> point of the stay is on an equal plan as the base of the mast rather
> than ~1ft below it.
>
> You engineers out there, what do you think?
>
> Hank
>
>
> On 9/26/08, Luis Guzman <trpclman at yahoo.com> wrote:
>   
>> Stan,
>>
>> I'm curious if the stay that is attached to the spreader  could also be
>> attached to the cabin top and at the same time have a shorter spreader. This
>> way the Genoa could be brought closer to the mast and you would not have to
>> deal with trying to bring the Genoa in between the stays and having to furl
>> it..
>>
>> I wanted to experiment and modify my '75 Rhodes this way, but I sold it,
>> and I do not want to experiment with the '82 Rhodes.
>>
>> Luis
>> S/V Miracle
>>
>>
>>
>> ----- Original Message ----
>> From: stan <stan at rhodes22.com>
>> To: The Rhodes 22 mail list <rhodes22-list at rhodes22.org>
>> Sent: Friday, September 26, 2008 9:12:39 AM
>> Subject: Re: [Rhodes22-list] sailing sense #2 or something you already know
>>
>> dedicated to Dr. Krawitz (Paul to his fellow Rhodies) re pointing, to Rummy
>> for reminding me and Ed and Dan and others for responding to my "Test".
>>
>> I attempted this some time ago but it seems I had been excommunicated from
>> the List for ignoring the don't tell code on my take on religion.  MM now
>> has me back in temporary good standing but did not pass on the blocked
>> message,  I sent it off List to John to post but he may not have received
>> it.  I sent it off List to Rummy to post but it looks like he did not get
>> it
>> either so, having passed the "test",  I will try again:
>>
>>
>> Lee, I need a curious Rhodie to give my guess a try.
>>
>> When Phil designed the boat he had no idea we would build it so good or
>> that there would be a UPP on the transom or that owners would over stuff
>> the lazaret and
>> themselves, so it sits too low at the stern.
>>
>> It is my guess that if the nose of the boat were lowered in the water:
>>     a)    The transom would come up leading to less turbulence (more speed)
>>     b)    The water line would increase leading to better wave formation
>> (more speed)
>>     c)    The fin's center of effort would move slightly more forward
>> leading to better helm (possibly more speed)
>>     d)    And pointing ability would improve.
>>
>> Lee, try putting 200 pounds or more temporary ballast way forward in the V
>> berth and then put your boat through all your double blind tests and call
>> Dr. Krawitz in the morning.
>>
>> One other TRICK, if you have the energy:
>>
>>     The large spreader width on the Rhodes was designed to make using the
>> shrouds as vertical life lines, when walking to the bow via the boat's
>> cabin
>> side decks, comfortable.    Drastically cut back the length of the spreader
>> tubes.  This will allow better pointing using the full genoa, or any genoa
>> size larger than can be used when switching to the secondary genoa jib
>> sheet
>> leads inside the upper shrouds.
>>
>> Allow we proud parents an aside:  Now that we are all socialists I want to
>> remind you that Cindy's book, "America's Bubble Economy" (Barnes and Noble)
>> was right on the money.  You do not want to hear what the economists behind
>> this book are predicting from here on ..............
>>
>> ss
>>
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>>
>>
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