[Rhodes22-list] Chain/Rope Rode

[Bill Effros]

Slim,

The formula is totally arbitrary.  You are right, it makes no sense.  
Reducing all the chain/rope rode answers to English, everyone seems to 
agree that the "helper metal" theory is rubbish.  No one wants to defend 
that theory.  Which leaves the catenary curve theory.  The chain is 
going to pull the anchor in a perfectly horizontal direction by lying on 
the bottom while the rope forms a catenary curve pulling on the chain.  
It may take another half day, but the physics majors aren't going to 
defend that proposition for very long, either.

So someone will trot out the "protecting the rope from the rocks on the 
bottom" theory.  But why should a 10 foot boat require only 10 feet of 
protected rode and a 20 foot boat need 20 feet of protected rode if the 
chain is pulling all the rode to the bottom?

Attaching chain doesn't make the rope any stronger.  In fact, it makes 
it weaker.

Really going to bed now.  Can't work musicians hours like I used to,

Bill Effros

salm at mn.rr.com wrote:

>Who came up with the formula that says one foot of chain for one foot of
>boat length?  Shouldn't it be calculated by 
>weight?  Rik's Flicka, for example, is three feet shorter but (I'm
>guessing) 2000 lbs. heavier.    Surely his ground 
>tackle needs to be more robust than that of an R22.
>
>Slim
>
>Original Message:
>-----------------
>From: Michel Meltzer mjm at michaelmeltzer.com
>Date: Thu, 12 Jan 2006 22:05:16 -0500
>To: rhodes22-list at rhodes22.org
>Subject: RE: [Rhodes22-list] Anchoring
>
>
>
>
>Ok. Looks like I miss all the Fun today. To save some of the heartache,
>lets try to organize the issues a bit.
>
>We are in a applied engineering domain and practical user experience,
>the engineers please simplify and use good examples, for the "sailors"
>please understand there are time proven Numerical methods and you might
>have to simply accept them, there is a reasonable question if the
>"model" being used is right, but It only pisses off the engineers with
>"unproven nonsense", junk arguments, etc....
>
>First off how much anchor?
>1)for the most part it is a function of wind speed and somewhat wind and
>tide.
>a)at zero wind a there is no force, so a brick on kite string will work
>b)at an F5 tornado you can kiss your ask good by
>c) lets pick a speed that we can agree on for this, I like (1) 42 knots,
>a very good thunderstorm, (2) 63 knots (the edge of the hurricane and
>perhaps a once in a lifetime event, but I got nailed their). 
>d)I could not find the tables for windload from the last time, can
>someone calculated look/up the load in lb for a rhode22 type of
>sailboat, IIRC I estimated about 900lb's at the top number, but I might
>be high.
>
>
>2) Connecting to boat, load forces
>a)that has never been much of an issue on the rhodes, best statement is
>connecting to the bow eye lessens the scope
>b)but if some one wants to agurge forces on the cleats go ahead
>
>
>3)deck chocks
>a)type
>b)location
>c)how installed
>d)the need for chaffe grards
>
>4)scope lengths
>1)5:1
>2)7:1
>3)10:1
>4)impact crowding?
>
>5)rode type and size
>a)3/8 3 strand new gland
>b)nylon does not float?
>c) tripping people up/run over the rope with a floating rode?
>d) 7/16 and 1/2 do not streght right on a whodes22?
>e)storage, flacking
>other?
>
>6)Chian
>a) size (1/4 inch)
>b)length
>c)effects on the anchor
>d)The effects of chaff of the shaft holding the rope on the bottom
>without it
>
>7)setting
>a)stopped
>b)moveing
>c)in a all out emerangys
>d)in the storm and it dragging
>
>7)the effect or wind and tide
>a)boat chance direction, will the anch break out
>b)will the anchor reset on its own when the boat moves(which it will)
>
>8)anchors types and bottoms
>(this just gooes on)
>but..
>short scope 
>long scope
>
>
>
>
>9)special comments:
>a)how some danforst set only on their points and one point
>b)how some danforths when they reset, draw a "line" on the bottom and
>will not reset
>c)how some danforst that are mad of AL, will "sail" in slow moveing
>water and never reach the bottom
>
>   
>
>This should get it started
> 
>
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