[C38] Symetrical Spinnakers
tdtron at earthlink.net
tdtron at earthlink.net
Fri Aug 3 10:18:45 EDT 2012
Hello Joe,
What is the Inside diameter 6' post? If you can find out that dimension and locate a piece of similar material but smaller with an outside diameter of the inside diameter of the standing 6' post, you could easily telescope the two pieces together making the post mount any height you want.
As you know, the strains are less higher up the post vs. the lower section so you will not lose any strength by using a smaller diameter post extension and your wind resistance will be less also than a uniform diameter post to the new height.
I have made similar projects and finding exact size tubes that have telescoping dimension properties is often difficult but the radio industry has sources for telescoping materials. If your existing post does not have a corresponding smaller post material that is compatible, you can shim the smaller post with something like plastic tape (not duct tape) to take out the dimensional differences if they are small. I have also used the shim method to transition from steel to aluminum with good results since the materials are isolated by the dielectric qualities of the plastic tape. Any ham radio outlet should be able to give you resources to find the materials you need to make a post extension. This is a regular problem with building radio antennas and towers.
If this procedure of using an inside post to modify the height of your existing post will work for you, you may be able to leave the existing post mounted to your boat which will save a lot of time.
I wish you were closer to me so I could help you with this project. I have a fairly complete weld shop and machine shop so that I can still practice my abilities of being a technical blue collar nerd wannabe.
Good luck,
Tom Troncalli
----- Original Message -----
From: Joseph Launie
To: listserve at catalina38.org
Sent: 8/3/2012 3:01:36 AM
Subject: Re: [C38] Symetrical Spinnakers
Steve,
Thanks - now how do I go from a 6 foot post to a 10 foot one? I have lots of xtra cable. I guess I have to discard this one and build the ten foot out of aluminum. It would be way easier if I could cut the co-ax. Joe
On 8/2/2012 10:22 PM, Steve Smolinske wrote:
Joe,
When I did my post I did the calculations so that the bowman assuming he is six feet tall would be missed by the beam, our post is 10 tall and mounted so the base is where the fuel line vent use to be. If I remember correctly the angle off the the radome for the beam is 2-2.5 degrees
Steve
From: listserve-bounces at catalina38.org [mailto:listserve-bounces at catalina38.org] On Behalf Of Joseph Launie
Sent: Tuesday, July 31, 2012 10:14 AM
To: listserve at catalina38.org
Subject: Re: [C38] Symetrical Spinnakers
we have another rigging issue.We let the idiot "rigger" for the local J boat dealer install our radar. He put it on a post 6 feet above the deck. We are afraid to use it for fear of radiation damage. Any thoughts? Joe
On 7/31/2012 9:39 AM, William Knowles wrote:
Jay are you using the external spin block or an internal one say your spare jib haylard, that could be a problem.
Bill
On Tue, Jul 31, 2012 at 11:24 AM, Donald Strong <drstrong at ucdavis.edu> wrote:
Jay: I feel for you man. We have had lots of spinny drama. We always roller furl the jib when flying
spinnaker. The rest of your questions are beyond my experience.
Don
>
> ------_=_NextPart_002_01CD6EB3.1776DEB4
> Content-Type: text/plain;
> charset="us-ascii"
> Content-Transfer-Encoding: quoted-printable
>
> Hello All,
>
>
>
> We flew our 0.75 oz spinnaker for the first time yesterday during a
> family sail and have a couple of questions for the group.
>
>
>
> 1. During the douse the spin halyard got stuck and
> appeared to be caught on the roller furling gear near the masthead. Is
> this common? Also, is it normal to roller furl the jib when using a
> symmetrical chute or do you really need to drop it on deck? I race on a
> Serendipity 43 and Swan 51 with a deck sweeper jibs that are dropped
> when flying a chute, and on a J-105 that rolls the jib while flying an
> asymmetrical, so having a roller furler and a symmetrical chute is new
> to us.
>
> 2. While working to get the chute down we added a few
> new tears to the many that were there previously so was going to put out
> a call to anyone who might have a used symmetrical spinnaker(s)
> (0.5-0.75oz) laying around that they are not using. Will pay a
> reasonable price plus shipping!
>
> 3. And lastly, does anyone who uses very light
> spinnaker sheets in light air have a preference for light weight
> shackles. The plastic Lewmar ones we use on the Serendipity tend to
> open up under load and I thought one of you may have a preferable
> option?? Or maybe we'll just tie on light line!
>
>
>
> Thanks much!
>
>
>
> Jay & Dorothy Sorensen
>
> C-38 #311 Broad Reach
>
> San Diego, CA
>
>
>
>
> ------_=_NextPart_002_01CD6EB3.1776DEB4
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>
> <p class=MsoNormal><font size=2 face=Arial><span
> style='font-size:10.0pt;
> font-family:Arial'>Hello All,<o:p></o:p></span></font></p>
>
> <p class=MsoNormal><font size=2 face=Arial><span
> style='font-size:10.0pt;
> font-family:Arial'><o:p> </o:p></span></font></p>
>
> <p class=MsoNormal><font size=2 face=Arial><span
> style='font-size:10.0pt;
> font-family:Arial'>We flew our 0.75 oz spinnaker for the first time
> yesterday
> during a family sail and have a couple of questions for the
> group.<o:p></o:p></span></font></p>
>
> <p class=MsoNormal><font size=2 face=Arial><span
> style='font-size:10.0pt;
> font-family:Arial'><o:p> </o:p></span></font></p>
>
> <p class=MsoNormal
> style='margin-left:.75in;text-indent:-.5in;mso-list:l0 level1
> lfo1'><![if !supportLists]><font
> size=2 face=Arial><span
> style='font-size:10.0pt;font-family:Arial'><span
> style='mso-list:Ignore'>1.<font size=1 face="Times New Roman"><span
> style='font:7.0pt "Times New
> Roman"'>
> </span></font></span></span></font><![endif]><font
> size=2 face=Arial><span
> style='font-size:10.0pt;font-family:Arial'>During the douse the spin
> halyard
> got stuck and appeared to be caught on the roller furling gear near the
> masthead. Is this common? Also, is it normal to roller furl
> the jib
> when using a symmetrical chute or do you really need to drop it on deck?
> I
> race on a Serendipity 43 and Swan 51 with a deck sweeper jibs that are
> dropped
> when flying a chute, and on a J-105 that rolls the jib while flying an
> asymmetrical, so having a roller furler and a symmetrical chute is new to
> us.<o:p></o:p></span></font></p>
>
> <p class=MsoNormal
> style='margin-left:.75in;text-indent:-.5in;mso-list:l0 level1
> lfo1'><![if !supportLists]><font
> size=2 face=Arial><span
> style='font-size:10.0pt;font-family:Arial'><span
> style='mso-list:Ignore'>2.<font size=1 face="Times New Roman"><span
> style='font:7.0pt "Times New
> Roman"'>
> </span></font></span></span></font><![endif]><font
> size=2 face=Arial><span
> style='font-size:10.0pt;font-family:Arial'>While working to get the chute
> down
> we added a few new tears to the many that were there previously so was
> going to
> put out a call to anyone who might have a used symmetrical spinnaker(s)
> (0.5-0.75oz) laying around that they are not using. Will pay a
> reasonable
> price plus shipping!<o:p></o:p></span></font></p>
>
> <p class=MsoNormal
> style='margin-left:.75in;text-indent:-.5in;mso-list:l0 level1
> lfo1'><![if !supportLists]><font
> size=2 face=Arial><span
> style='font-size:10.0pt;font-family:Arial'><span
> style='mso-list:Ignore'>3.<font size=1 face="Times New Roman"><span
> style='font:7.0pt "Times New
> Roman"'>
> </span></font></span></span></font><![endif]><font
> size=2 face=Arial><span
> style='font-size:10.0pt;font-family:Arial'>And lastly, does anyone who
> uses
> very light spinnaker sheets in light air have a preference for light
> weight
> shackles. The plastic Lewmar ones we use on the Serendipity tend to
> open
> up under load and I thought one of you may have a preferable
> option?? Or
> maybe we’ll just tie on light
> line!<o:p></o:p></span></font></p>
>
> <p class=MsoNormal><font size=2 face=Arial><span
> style='font-size:10.0pt;
> font-family:Arial'><o:p> </o:p></span></font></p>
>
> <p class=MsoNormal><font size=2 face=Arial><span
> style='font-size:10.0pt;
> font-family:Arial'>Thanks
> much!<o:p></o:p></span></font></p>
>
> <p class=MsoNormal><font size=2 face=Arial><span
> style='font-size:10.0pt;
> font-family:Arial'><o:p> </o:p></span></font></p>
>
> <p class=MsoNormal><font size=2 face=Arial><span
> style='font-size:10.0pt;
> font-family:Arial'>Jay & Dorothy
> Sorensen<o:p></o:p></span></font></p>
>
> <p class=MsoNormal><font size=2 face=Arial><span
> style='font-size:10.0pt;
> font-family:Arial'>C-38 #311 Broad
> Reach<o:p></o:p></span></font></p>
>
> <p class=MsoNormal><st1:place w:st="on"><st1:City
> w:st="on"><font size=2
> face=Arial><span style='font-size:10.0pt;font-family:Arial'>San
> Diego</span></font></st1:City><font
> size=2 face=Arial><span style='font-size:10.0pt;font-family:Arial'>,
> <st1:State
>
> w:st="on">CA</st1:State></span></font></st1:place><o:p></o:p></p>
>
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> style='font-size:
> 12.0pt'><o:p> </o:p></span></font></p>
>
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>
> </body>
>
> </html>
>
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