Good Info......Anyone out there know what he Loos Gauge readings should be for a Cat 27 Tall Rig? Standing rigging is si important for strutural integrity. I run with a perhaps too loose a standing rigging; maybe I shouldn't.
Fair Winds ...... Jim Huhta S/V "SEA 130" Hull 4402 Sturgeon Bay, WI --- On Sun, 7/6/08, Harvey Rosenberg <[EMAIL PROTECTED]> wrote: > From: Harvey Rosenberg <[EMAIL PROTECTED]> > Subject: RE: catalina27-talk: Re: Quick Question on Shroud Hook-up Locations > To: [email protected] > Date: Sunday, July 6, 2008, 3:10 PM > Hi Phil, > > When I read the word "failure" I gulped. I sort > of understand what you are saying, but what is the solution > for the C-27 rig. > > > ------ Original Message ------ > Received: Sun, 06 Jul 2008 03:57:21 PM EDT > From: "Phil A" <[EMAIL PROTECTED]> > To: <[email protected]> > Subject: RE: catalina27-talk: Re: Quick Question on > Shroud Hook-up Locations > > > > > > > When you tighten the fore stay, back stay, and upper > shrouds the mast want to flex out of column, like squeezing > a flat tooth pick from its ends. Squeeze too much and snap. > > > > You can see what mast pumping is by squeezing the tooth > pick slowly (safety glasses please) in a C-Clamp and then > gently try to move the middle back to straight. It will act > like an over center spring and want to move to anywhere but > straight. Without tensioned lowers the mast acts like the > tooth pick and it wants to be anywhere but straight. Add > the forces of sailing whether it’s the roll of the waves > or chop or a sail buffeting and these force at time may > move the center of the mast column to ward center where it > doesn’t want to stay so instead of loading up cleanly it > pumps back and forth. Let the pumping continue and it can > work harden the aluminum at the flex point leading to > failure. > > > > The lowers are there to keep the mast in column, > although mast tuning for performance may require an > intentional bow known as pre-bend. Even when pre-bend is > used the center of the column is restrained from moving > about so the loads are taken cleanly, without pumping. > > > > Higher performance rigs start using quickly adjustable > standing rigging known as various types of running stays > but each adds to the risk of a demasting, as well as, > adding to performance. Your local PHRF authority will > penalize you for the modification, if it is allowed at all. > Of course it is not allowed at all in one-design racing. The > factory added adjustable rear lowers (baby stays) to the > Santana 20 design at some point and these appear were > accepted by their one-design rules and the change escaped > PHRF scrutiny but that’s an exception. > > > > > > Phil Agur s/v Wing Tip > Secretary, Call Sign WCW3485 > IC27/270A MMSI 366901790 > www.catalina27.org Vessel Doc# 1039809 > > > > -----Original Message----- > From: [email protected] > [mailto:[EMAIL PROTECTED] On Behalf Of > iicaptbrad > Sent: Sunday, July 06, 2008 10:42 AM > To: [email protected] > Subject: Re: catalina27-talk: Re: Quick Question on > Shroud Hook-up Locations > > > > > Harvey, > > > > > > > > I was going to ask a question which you may have > touched on in your second paragraph. Mast pumping. When > I'm sitting on my boat at the dock while just a > moderate breeze blows, the boat occassionally vibrates from > the rigging. I was wondering if this is normal and if the > rigging might be too tight or loose or out of adjustment. > The standing rigging seems tight, all shrouds and stays, > and the mast stands straight if not for a slight forward > tilt (not noticable unless you hang a plumb bob). I've > gazed at the rigging while this vibration is happening on > several occassions and noticed, I think, the mast vibrating > fore and aft around the spreaders which leads me to believe > the lowers are loose, but they are tight like a violin > string. Is this what you mean by mast pumping? > > > > > > > > Brad > > > > > > > > > ----- Original Message ----- > > > > From: Harvey Rosenberg > > > > To: [email protected] > > > > Sent: Saturday, July 05, 2008 7:58 AM > > > > Subject: [Norton AntiSpam] Re: catalina27-talk: Re: > Quick Question on Shroud Hook-up Locations > > > > > > > Hi Andy, > Who is doing the shrouds? Is it George over at > Samalot Marine? I can't believe he would do that. He > must be thinking of Hunter B&R rigs. Our mast is not a > bendable mast. You can adjust shoud tension and rake, but > not bending it. It has to stay in column in all four > directions. The foreward shrouds supports this. Leading it > aft would put more stress on the leading edge of the mast > when going upwind. > > C-27's are known for their mast pumping at dock > in high winds and this would certainly aggravate this > condition. > > Take him on a walk over at the South docks and look > at the other C-27's. . > > Where is your boat. I couldn't find it? > > Regards Harvey Rosenberg C-27TR #6023, 1985 M-18 > > Harvey Rosenberg C-27TR > > > ------ Original Message ------ > Received: Fri, 04 Jul 2008 08:59:07 PM EDT > From: [EMAIL PROTECTED] > To: [email protected] > Subject: catalina27-talk: Re: Quick Question on > Shroud Hook-up Locations > > > > > > To List > > > > I have a quick question. I am having the shrouds > change on my boat (....along with a great deal of other > work, Boat fell off its stanchions this past March) and > while the marina was setting up the new shrouds, he placed > the lower forward shroud at the same spot as the upper > shroud. He now had the forward lower and the center upper > on the same spot where I thought the upper should be alone, > and the stern lower in the correct spot. I questioned him > on this and he said that the center was designed to take > the forward lower shroud and the center shroud and the > stern lower shroud stands alone. I always though that all > three had their on spot for hook-up. Am I wrong? The > marina guy seemed to be sure of his answer and mentioned > that he has done this hook-up on several Catalina 27's > before. I hope this explanation makes sense with all the > upper and lower words used!!! > > > > Thanks > > > > Andy > > > > Slow "MO" tion #6038 > > > > Nyack, NY > > > > > > > > > > > > > > > > the world a better place one message at a > time. Check out the i'm Talkathon. = > > > > > > > > > > > > > Gas prices getting you down? Search AOL Autos for > fuel-efficient used cars. > > > > > > postamble();
