These are things that don't fail very often, so if you're concerned, I would suggest replacing them just in case. Extra room for spares is going to be at a premium so anything you can do to free up space is a good idea.
Andy C&C 40 Peregrine On Tue, Jul 26, 2016 at 11:03 AM, Robert Boyer via CnC-List < cnc-list@cnc-list.com> wrote: > I am making last minute preparations to leave cruising this fall. I want > to carry spare Morris cables for both the gear shift and the throttle since > I have had these fail many years ago. Since I don't want to remove them > just to make measurements, does anyone have the specs on these cables for > ordering? > > Bob > > Bob Boyer > s/v Rainy Days > C&C Landfall 38 (Hull # 230) > Annapolis, MD (presently in Baltimore) > blog: dainyrays.blogspot.com > email: dainyr...@icloud.com > > On Jul 26, 2016, at 10:39 AM, David via CnC-List <cnc-list@cnc-list.com> > wrote: > > Ya gotta love it... > > "lateral sinusoidal force" > > > David F. Risch > (401) 419-4650 (cell) > > > > To: cnc-list@cnc-list.com > > Date: Tue, 26 Jul 2016 10:26:34 -0400 > > Subject: Re: Stus-List Singing Rigging > > From: cnc-list@cnc-list.com > > CC: colt...@verizon.net > > > > I happen to know a Ph.D on the subject, so I ran it by him : > > Probably a little more info than anyone needed, but that is > > Just what we do on this list! > > > > << Bill: > > > > The winglets and vortex shedding are unrelated. They both involve > > vortexes but they are different issues. > > > > When you have flow separation around a bluff body (like a shroud or a > > mast) you will get vortices shed in an alternating fashion from one side > > and then the other. This will cause a lateral sinusoidal force and if the > > frequency of the shedding matches the natural frequency of the object it > > will go into resonance which is what causes the noise. > > > > An airplane wing also produces vorticity but unless it's stalled it's not > > vortex shedding. The wing vorticity causes a change in the direction of > > the incoming flow which results in part of the lift vector pointing > > backwards - which is in the direction of drag - and is thus called > > lift-induced drag (or just induced drag). Winglets bascailly fake out the > > flow to make it think that the wing is longer than it is, and thus > reduced > > the induced drag. > > > > If you google "vortex shedding" and "induced drag" I'm sure you will see > > some pictures or drawings explaining this. > > > > Cheers, > > > > Bill L >> > > > > > > > > -----Original Message----- > > From: CnC-List [mailto:cnc-list-boun...@cnc-list.com > <cnc-list-boun...@cnc-list.com>] On Behalf Of Don > > Wagner via CnC-List > > Sent: Monday, July 25, 2016 8:08 PM > > To: cnc-list@cnc-list.com > > Cc: Don Wagner; Christian Tirtirau > > Subject: Re: Stus-List Singing Rigging > > > > This is technically known as "vortex shedding". It's a natural phenomena > > caused by the air flow around a round cylinder ( the rod or the wire) and > > occurs at certain wind speeds. At normal speeds, normal flow occurs, and > > there's no vibration. At certain higher speeds, vortexes develop, and > > induce > > > > vibrations in the rigging. Tightening or loosing the rigging will usually > > reduce the effect. You can find a more complete description on the > > internet. > > > > Note: Commercial airliners have observed the problem at their wing tips, > > and > > > > many recently added small winglets at the ends of their wings. I believe > > this reduces energy loss, reduces the vibration, and improves their fuel > > mileage. > > > > Don Wagner > > C&C 41 CB > > Der Baron > > West River MD > > > > > > > > -----Original Message----- > > From: Christian Tirtirau via CnC-List > > Sent: Monday, July 25, 2016 11:04 AM > > To: cnc-list@cnc-list.com > > Cc: Christian Tirtirau > > Subject: Stus-List Singing Rigging > > > > Hello fellow seers, > > I'm getting this humming in the mast as soon as I have a little breeze > > while > > > > on the mooring ball and it's really annoying. At first I thought it was a > > generator or an engine sound propagated by water but I realized it's the > > strings of this big violin that are singing. Any idea how you get rid of > > that without messing up the rig balance? Is it the baby stay? I have a > > lower > > > > that is a little loose and when I tension it the sound pitch changes but > > does not go away. > > Cheers, > > Christian Tirtirau > > C&C 37 Northern Light > > > > _______________________________________________ > > > > This list is supported by the generous donations of our members. If you > > like > > > > what we do, please help us pay for our costs by donating. All > > Contributions are greatly appreciated! > > > > > > _______________________________________________ > > > > This list is supported by the generous donations of our members. If you > > like > > what we do, please help us pay for our costs by donating. All > > Contributions > > are greatly appreciated! > > > > > > _______________________________________________ > > > > This list is supported by the generous donations of our members. If you > like what we do, please help us pay for our costs by donating. All > Contributions are greatly appreciated! > > > <https://www.avast.com/sig-email?utm_medium=email&utm_source=link&utm_campaign=sig-email&utm_content=webmail&utm_term=oa-2368-c> > Virus-free. > www.avast.com > <https://www.avast.com/sig-email?utm_medium=email&utm_source=link&utm_campaign=sig-email&utm_content=webmail&utm_term=oa-2368-c> > <#m_-1341891375738106708_DAB4FAD8-2DD7-40BB-A1B8-4E2AA1F9FDF2> > > _______________________________________________ > > This list is supported by the generous donations of our members. If you > like what we do, please help us pay for our costs by donating. All > Contributions are greatly appreciated! > > > _______________________________________________ > > This list is supported by the generous donations of our members. If you > like what we do, please help us pay for our costs by donating. 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