One thing to remember about the Garhauer vang is that the attachment to both the mast and the boom are custom made for the boat (you send them the profile of the mast and boom when you order the vang), and the plates attached to the mast and boom wrap significantly around the spars. (On my 25 about half of the boom is cradled in the attached plate. ) So the fasteners connecting the plate to the spar are under primarily shear loading, not tensile.
For this sort of configuration, the additional cross section of the machine screw (or cap screw, if you use those) would seem the better choice. If, however, you have something like a Boomkicker, or a vang with “generic” mounting plates that don’t curve around the spars, rivets might be a better choice. Rick Brass Imzadi C&C 38 mk2 #47 la Belle Aurore C&C 25 mk1 #225 Washington, NC BTW, both have Garhauer vangs. From: CnC-List [mailto:cnc-list-boun...@cnc-list.com] On Behalf Of bwhitmore via CnC-List Sent: Wednesday, July 26, 2017 6:52 PM To: cnc-list@cnc-list.com Cc: bwhitmore <bwhitm...@sbcglobal.net> Subject: Re: Stus-List Rigid boom vangs - rivets vs screws When I got my rigid vang from Garhauer, they suggested the course threads. The fine threaded screws, they argued are shallower, and therefore will strip or pull out easier. It might be a good idea to call Garhauer for verification. Good luck, Bruce Sent from my Verizon, Samsung Galaxy smartphone -------- Original message -------- From: schiller via CnC-List <cnc-list@cnc-list.com <mailto:cnc-list@cnc-list.com> > Date: 7/26/17 6:20 PM (GMT-05:00) To: cnc-list@cnc-list.com <mailto:cnc-list@cnc-list.com> Cc: schiller <schil...@bloomingdalecom.net <mailto:schil...@bloomingdalecom.net> > Subject: Re: Stus-List Rigid boom vangs - rivets vs screws I would add that fine threads would be better than coarse for the relatively thin section. Neil Schiller 1970 Redwing 35, Hull #7 (C&C 35 Mark 1) Corsair Still waiting so see if we can be repaired in Muskegon, Michigan Sent from my iPad > On Jul 26, 2017, at 11:34 AM, Dennis C. via CnC-List <cnc-list@cnc-list.com > <mailto:cnc-list@cnc-list.com> > wrote: > > Seems to be a difference of opinion. I've installed several but that doesn't > make me an expert. I've seen aluminum rivets, stainless rivets, machine > screws and hex head bolts. > > My opinions on each. > > Aluminum rivets - not strong enough. Will eventually work loose or break. > > Stainless rivets - my choice. Very, very low potential to work loose or > break. Coat with TefGel to minimize dissimilar metal corrosion. Downside - > requires expensive rivet tool. > > Machine screws - some potential to work loose. Once they work loose, bad > things can happen. I don't have a real issue with them as long as they're > coated with red thread locker. > > Hex head bolts - some potential to work loose but, in my opinion, a better > choice than machine screws. Coat with red thread locker. If you need to > remove them, easier than machine screws. They can also be tightened more > than machine screws. > > Bottom line - if you don't have a Big Daddy rivet tool, screws or bolts are > fine. Just use red thread locker and inspect them every now and then. > > Hope this helps. > > Dennis C. > Touche' 35-1 #83 > Mandeville, LA > > > _______________________________________________ > > This list is supported by the generous donations of our members. If you wish > to make a contribution to offset our costs, please go to: > https://www.paypal.me/stumurray > > All Contributions are greatly appreciated! _______________________________________________ This list is supported by the generous donations of our members. If you wish to make a contribution to offset our costs, please go to: https://www.paypal.me/stumurray All Contributions are greatly appreciated!
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