Joe: Spirit's main has a generous roach with four battens but I have never had the roach hang up on the backstay like you and others have. Cutting down the boom from either end isn't going to keep the roach from snagging. I just have a hunch that when the longer booms started being used, the foot length on the mainsail was increased as well - thus setting the roach into the backstay.
Just a theory... Jim On Oct 11, 2008, at 6:36 PM, Joe Murphy wrote: > I have an Elliot Pattison as well. I don't have the precise > measurements > but what you have sounds on track. Does your sail have a roach? > Mine has 4 > half battens with a fair roach. And that's the part that catchs on > the > backstay. I will follow your (and Bob's) advice on setting the > gooseneck at > 19" high and see if the boom clears the backstay. I just finished > installing blocks and cleats for reefing so I'm hoping I don't have > to lop > off any of the boom. Will check this out Monday. > In the meantime, thanks to both you and Bob for the advice. > Joe > ----- Original Message ----- > From: "James Poulakis" <[EMAIL PROTECTED]> > To: "For and about Montgomery Sailboats" > <[email protected]> > Sent: Saturday, October 11, 2008 4:35 PM > Subject: Re: M_Boats: 17 boom length > > > Joe & Bob; > > Spirit’s stock Elliott Pattison mainsail: Luff 18’11”, Leech 20’1”, > Foot 7’6.5” (measured from the center of the head, tack, and clew > cringles). > > Joe: > Tune your rig with the mast raked aft and set your boom gooseneck > height to 19” per Bob’s instructions. Then tie off the downhaul and > use a slide stop under the gooseneck as Bob recommends. Now - lift > the end of the boom so it angles up above the backstay split. If the > boom can’t swing without hitting the backstay then your boom is > simply too long. If your boom is like mine it is probably about 2.5” > too long. > > We now have a number of examples of older booms being 2.5” to 3.5” > shorter then the newer booms. We also have newer M17 owners > reporting that their leech hangs up on the backstay, or that their > boom end hits when it gets near the backstay split. Coincidence? > > Bob: > Your solution of cutting 1.5” from the gooseneck end of the boom is > the most straightforward solution unless: > > 1) You’ve added a reefing system on the boom – which means that > cutting the boom from the gooseneck will change the geometry of your > boom hardware with respect to the clew reef cringles. > > 2) Your boom is 2.5” too long - in which case 1.5” isn’t enough. > > After re-examining everything. It looks like I can cut 2.5” off my > boom’s end and still be able to properly reposition the outhaul block > with enough room for that 1/2” “old age” allowance that Jerry’s feet > recommend. > > This really isn’t all that complicated. just want to noodle > everything out before I start chopping up a brand new boom. > > Jim > > > On Oct 10, 2008, at 7:39 PM, Bob From California wrote: > >> >> Hi Joe.... >> >> That's the ticket. Never raise the main to the very top. I usually >> raise it to the top and lower it >> so the boom is about 19 inches up from the mast base. Tie in the >> boom downhaul and raise the >> sail-stop just underneath the boom. >> >> There is some room to shorten the boom on the boats with a loose >> footed main. (all the boats I build) >> >> Simply remove the gooseneck, cut 1.5 inches off, square and clean, >> press the gooseneck back into >> the boom and drill a #25 hole, follow with a 10-24 tap, install the >> stainless machine screw. (do it in two >> places off set from the old holes in the gooseneck. which you can't >> see anyway) >> Should take 15 minutes. >> >> Joe, I posted a few photos of your Idasailor Rudder on the >> Montgomery Trailersailor site. How is that >> rudder working for you?....any complaints? >> >> The reason I ask is WILLI on Strawanza is wanting one for the next >> leg of his solo world trip. >> >> His M_17 is on the hard while waiting for Typhoon Season in the >> Indian Ocean to pass. He said a couple >> of times the fixed rudder would get stressed out in horrible storm >> conditions while lying ahull. The boat >> would be sliding down the backside of a 40 foot wall and the rudder >> would DIG sideways....he wants >> to be able to LIFT the rudder totally CLEAR of the water in these >> conditions and we are probably going >> to beef up a new Idasailor rudder for him (more stainless gussets) >> and AIRBORNE it to Vanuatu. >> >> Fair winds >> >> Bob >> >> >>> From: [EMAIL PROTECTED]> To: >>> [email protected]> Date: Fri, 10 Oct 2008 >>> 22:05:41 -0400> Subject: Re: M_Boats: 17 boom length> > Jim,> Just >>> out of curiosity, what is the lenth of the luff on your mainsail? >>> Do > you raise the main to the very top? I ask because my boom >>> does not hit the > backstay until it is raised to a height equal >>> to the split of the backstay. > However, having said that, if I >>> raise my main all the way then I find the > upper edge of my leech >>> will hit the backstay due to the cut of the roach. > If I get >>> enough power in the tack or jibe it's not a problem, but it has > >>> hung up on occassion.> Joe> ----- Original Message ----- > From: >>> "James Poulakis" <[EMAIL PROTECTED]>> To: "For and about >>> Montgomery Sailboats" > <[email protected]>> >>> Sent: Friday, October 10, 2008 8:16 PM> Subject: Re: M_Boats: 17 >>> boom length> > > > Thanks Arnold,> >> > From boom end to center of >>> gooseneck slide of Spirit's boom is 8'> > 2.5". If I lop 2.5" off >>> the end of the boom it will just clear the> > backstay at all >>> angles. Anything more then this will put me into> > mainsail >>> modification territory and I do NOT want to go there.> >> > Jim> >>>>>> On Oct 10, 2008, at 3:35 PM, Arnold Sharpe wrote:> >> >> Jim, >>> I measured the length of the boom on my M-17, It measures> >> >>> 7ft-11" from end to centerline of the tack pin and 8ft-01/4" to >>> the> >> center of the gooseneck slide.> >> Regards..Arnold Sharpe >>> M-17 "LITTLE BREEZE" hull # 265.> >> On Oct 10, 2008, at 2:38 PM, >>> James Poulakis wrote:> >>> >>> Thanks Jerry. Your input is >>> invaluable and very much appreciated.> >>>> >>> "Spirit" is M17 >>> #648 built in 2008 with Dwyer mast & boom extrusions.> >>> A >>> careful measurement reveals her boom w/ end fittings to be >>> 8'-3/4"> >>> long (aluminum extrusion without any fittings is >>> 8'-1/4")> >>>> >>> Jim Poulakis> >>> "Spirit"> >>>> >>> On Oct 9, >>> 2008, at 1:49 PM, jerry wrote:> >>>> >>>> just measured an old M17 >>> boom standing in the corner of the shop-> >>>> it's 7'9" long.> >>>>>>>>>>>> jerry> >>>> >>> _______________________________________________> >>>> http:// >>> mailman.xmission.com/cgi-bin/mailman/listinfo/> >>>> >>> montgomery_boats> >>>> >>>> >>> >>> _______________________________________________> >>> http:// >>> mailman.xmission.com/cgi-bin/mailman/listinfo/montgomery_boats> >>>>>>>>>>> _______________________________________________> >> >>> http://mailman.xmission.com/cgi-bin/mailman/listinfo/ >>> montgomery_boats> >> >> > >>> _______________________________________________> > http:// >>> mailman.xmission.com/cgi-bin/mailman/listinfo/montgomery_boats > > >>>> _______________________________________________> http:// >>> mailman.xmission.com/cgi-bin/mailman/listinfo/montgomery_boats >> _______________________________________________ >> http://mailman.xmission.com/cgi-bin/mailman/listinfo/montgomery_boats > > > _______________________________________________ > http://mailman.xmission.com/cgi-bin/mailman/listinfo/montgomery_boats > > > _______________________________________________ > http://mailman.xmission.com/cgi-bin/mailman/listinfo/montgomery_boats _______________________________________________ http://mailman.xmission.com/cgi-bin/mailman/listinfo/montgomery_boats
