Hi Francois- If 8-12 inches of flop is normal baseline, then I am probably in that ballpark. I was calling that floppy and thought it might be too much. Dave
> On Apr 30, 2015, at 1:33 PM, Jean-Francois J Rivard <jfriv...@us.ibm.com> > wrote: > > Hi Dave, > > The 34+ mast base is pretty much fixed. You adjust the rake by a combination > of forestay and backstay tension (Base backstay tension) and all should be > fairly tight. If your forestay foil is flopping around (More than about 8-12 > inches overall when you lean on it which is "loose" setting for light air) > you have 2 potential issues: 1 your furler may not work correctly 2) You're > diminishing the adjustable backstay's ability effectively do it's job of > bending the mast to flatten the main close hauled and / or help in > controlling heel. > > There's a guide on the C&C site here: > http://www.cncphotoalbum.com/doityourself/rod_rig_tuning.htm > <http://www.cncphotoalbum.com/doityourself/rod_rig_tuning.htm> > > Here's a guide for the 99 which is a very similar boat with the thick mast > cross-section / no runners: > http://www.doylesails.com/downloads/CC99TuningGuide.pdf > <http://www.doylesails.com/downloads/CC99TuningGuide.pdf> > > -Francois Rivard > 1990 34+ "Take Five" > Lake Lanier, Georgia > > Message: 1 > Date: Thu, 30 Apr 2015 12:03:16 -0400 > From: David Knecht <davidakne...@gmail.com> > To: dwight veinot <dwight...@gmail.com>, CnC CnC discussion > list > <CnC-List@cnc-list.com> > Subject: Re: Stus-List rig tuning > Message-ID: <c945e8ca-1598-4bd1-96bc-b0d64b6a2...@gmail.com> > Content-Type: text/plain; charset="utf-8" > > Hi Dwight- Now I am even more confused, but need to get back to the boat to > confirm my recollection. As I remember it, when the backstay has no added > tension, the roller furler track is quite slack and can be flopped around > easily by hand. I will measure it this weekend to see how much flop. So I > am having a hard time imagining how this tension could set the mast rake. On > my previous 34, the mast base had wood blocks to move fore-aft and the deck > had wood blocks to move fore aft and I thought that set the basal rake. The > 34+ has the mast base under the table and flooring and I have yet to take > everything out to get to it and see what is there. I also have not yet > checked basic rake by hanging something from the halyard. I will do that as > well. I don?t think the deck has blocks for positioning so maybe that > suggests your idea that rake is set by the forestay. But if there is not much > tension on the forestay at rest, it doesn?t seem to be doing much. If it > were reall! > y tight, you wouldn?t get much effect of tensioning the backstay with a > masthead rig. So is the primary goal and effect of tensioning the backstay to > put tension on the headstay to reduce curvature, or to put bend in the mast > to flatten and reduce mainsail power. Dave > Regards Dr. David Knecht Professor of Molecular and Cell Biology Core Microscopy Facility Director University of Connecticut 91 N. Eagleville Rd. Storrs, CT 06269 860-486-2200
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