[Rhodes22-list] Roger's technical reply to Todd's question.

Thu Nov 27 09:41:03 EST 2003

Impressive reply, as usual, but Roger is supposed to be studying.  Now
Stan has the scientific explanation for his intuitive design.  When this
was designed they did not have Computer Assisted Design and I am sure
Stan did all the computations by hand(?)
                       Ed K

-----Original Message-----
From: rhodes22-list-bounces at rhodes22.org
[mailto:rhodes22-list-bounces at rhodes22.org] On Behalf Of Roger Pihlaja
Sent: Thursday, November 27, 2003 8:37 AM
To: The Rhodes 22 mail list
Subject: [Rhodes22-list] Todd's Traveler

Todd,

The traveler track on Dynamic Equilibrium is a piece of 1" Nom. OD X
0.902"
ID X 72" Long 316 SS tubing.  I believe this is the same traveler track
length as on every other R-22 because it is limited by the backstay
chainplate spacing on the transom.  The end caps are nothing more than
two
pieces of 1-1/8" Nom. OD X 1.027" ID X 2" Long 316 SS tubing that have
been
drilled to accept the backstay wires and the fast pins that secure the
traveler track to the end caps.  This is a standard size and wall
thickness
SS tubing and should be available from any industrial metals &/or
laboratory
supply dealer.  Industrial or laboratory grade tubing will not be
electropolished.  But, this is a simple geometry & would not take very
long
to mechanically polish with a buffing wheel & polishing compounds.  I
would
estimate about 30 minutes polishing time per piece to get a mirror
bright
finish including setup and cleanup.

You might also consider going another route.  Look in the 2003 edition
of
the West Marine Master Catalog on pp. 702.  You could use two of the
Taylor
P/N 11730 stainless steel external eye ends sized to fit over the end of
1"
Nom. OD tubing.  You would have to drill out the threaded set screw hole
in
order to accept the fast pin.  This method will have the advantage that
the
end caps will be electropolished.  This geometry is not as theoretically
strong as GBI's original design using 1-1/8" Nom. OD tubing as end caps.
If
the Taylor eye end were overloaded in this application, the failure site
would be the joint between the round end cap and the tab that the
backstay
wire will pass thru.  If it were overloaded, I would expect it to fail
by
bending and torqueing at the joint until a crack opened up & the tab
came
off.  I wouldn't expect this to happen suddenly, but rather over a long
period of time with repeated shock loading.  But, these are cast
stainless
steel pieces, with radiused corners, electropolished (both radius &
polish
reduce stress concentration sites), and massively oversized for this
application.  So, I don't think you will have any problems with
deformation
under load.  This is a case of an inefficient design that succeeds by
simple
brute force.

If you are also looking for the traveler car, they are available from:

    RACE-LITE South Coast
    16516 Broadway
    Maple Heights, OH  44137
    216-581-4600

The P/N is: RL280 Roller Traveler.  I don't have current price data.

Hope this helps.  Good luck!

Roger Pihlaja
S/V Dynamic Equilibrium

----- Original Message -----
From: "Todd Tavares" <sprocket80 at mail.com>
To: "The Rhodes 22 mail list" <rhodes22-list at rhodes22.org>
Sent: Thursday, November 27, 2003 12:38 AM
Subject: Re: [Rhodes22-list] was Politics on the list. now Todd's
traveler

> Steve,
>
>     I know this was probably a trivial question and not really
critical.
As long as the traveler is high enough to clear the tiller with comfort.
I
save almost every pic that is posted if I think I can get some future
info
to help me with the restoration, especially now since I have 2 R22's to
restore.  I see from these pics that Roger's traveler is much higher and
has
less travel.
>
>    I cannot find the same style end caps that Stan uses in 1", so I
will
have to get creative.
>
> But not having the mast up now,  I wanted to make the tube long enough
to
span the distance between the backstays, keeping it high enough, while
getting maximum travel with out having to break out the TI-82 :-)  But
about
58" - 60" long and 24" up from the chain plates should be in the
ballpark.
>
> Besides,  I wanted Fred to have some enjoyable boat posts to peruse.
;-)
>
> Todd
>
>
>
> ----- Original Message -----
> From: Steve Alm <salm at mn.rr.com>
> Date: Wed, 26 Nov 2003 14:25:51 -0600
> To: Rhodes <rhodes22-list at rhodes22.org>
> Subject: Re: [Rhodes22-list] was Politics on the list. now  Todd's
traveler
>
> > 13 holes for adjustment?  ...Huh?  Since my 1990 R22 is put to bed
for
the
> > season, I can't give you any dimensions, but my 1" OD traveler bar
fits
into
> > 1" ID caps that are attached to the back stays and held in place
with a
pin
> > through a single hole.
> >
> > Slim
> >
> > On 11/26/03 9:28 AM, "Todd Tavares" <sprocket80 at mail.com> wrote:
> >
> > > Thanks Jerry!
> > >
> > >
> > > ----- Original Message -----
> > > From: "cjlowe" <cjlowe at bright.net>
> > > Date: Tue, 25 Nov 2003 23:15:35 -0500
> > > To: "The Rhodes 22 mail list" <rhodes22-list at rhodes22.org>
> > > Subject: Re: [Rhodes22-list] was Politics on the list. now  Todd's
traveler
> > >
> > >> Todd,
> > >>   I have an 86 with IMF. The traveler is 59 5/8 " long, of 1"
tubing.The
> > >> distance between the center of the eye of the swedged fitting and
the
center
> > >> of the traveler tubing is 15". The eye attaches the a U shaped
bracket 4
> > >> 1/4" long ,with 13 holes in it for adjustment. If you need
anything
else
> > >> just holler
> > >>   Jerry
> > >>
> > >> __________________________________________________
> > >> Use Rhodes22-list at rhodes22.org, Help? www.rhodes22.org/list
> > >>
> >
> > __________________________________________________
> > Use Rhodes22-list at rhodes22.org, Help? www.rhodes22.org/list
> >
>
> --
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