<div dir="ltr"><div>Do not drill more holes.  This is a critical spot on the boom and more holes are begging for a stress point/critical failure.</div><div><br></div><div>One windy day on the Charles river we lost about 5 Tech booms in the course of 1 hour.  The common thread was that they had all recently been repaired by drilling out new vang bale holes in the boom.  If only someone had done a stress/strain analysis of the boom prior to sinking all those holes.  It's not like they couldn't have run across the street to MIT and asked anyone in the Mech E department. ;)</div><div><br></div><div>The link that Peter posted has some very good suggestions.  I think the best one is making sure you have a bolt that does not have threads contacting the aluminum.  I'd reuse the same holes, but address whatever issue it is that caused them to elongate in the first place.</div><div><br></div><div>Mike</div></div><div class="gmail_extra"><br><div class="gmail_quote">On Mon, May 2, 2016 at 9:00 AM, Peter McHenry via J22 <span dir="ltr"><<a href="mailto:j22@lists.wyc.org" target="_blank">j22@lists.wyc.org</a>></span> wrote:<br><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex"><div><div style="color:rgb(0,0,0);font-family:HelveticaNeue-Light,Helvetica Neue Light,Helvetica Neue,Helvetica,Arial,Lucida Grande,sans-serif;font-size:13px;background-color:rgb(255,255,255)"><div>Check out SA form:</div><div dir="ltr"><a href="http://forums.sailinganarchy.com/index.php?showtopic=156965" target="_blank">j22 vang bail holes, boom anarchy poll. - Fix It Anarchy</a></div><div><br></div><div style="font-family:"Helvetica Neue",Helvetica,Arial,sans-serif;max-width:400px" dir="ltr"> <a style="color:rgb(0,0,0)!important;text-decoration:none!important" href="http://forums.sailinganarchy.com/index.php?showtopic=156965" target="_blank" rel="noreferrer"> <table style="max-width:400px" border="0" cellspacing="0" cellpadding="0"> <tbody><tr> <td width="400"> <table width="100%" style="max-width:400px" border="0" cellspacing="0" cellpadding="0"> <tbody><tr> <td background="https://s.yimg.com/vv//api/res/1.2/vZDRew8k8iNHDk22cZQEOg--/YXBwaWQ9bWFpbDtmaT1maWxsO2g9MjAwO3c9NDAw/http://forums.sailinganarchy.com/public/style_images/master_custom/meta_image.png.cf.jpg" valign="top" style="background: url("https://ci4.googleusercontent.com/proxy/3Q0sP7oE_2PccnYksqvSNRovtSxHC3JcOjWYkWxY-C_R4idiK50akKN3RgXuG6E5sAnaztW7Pk0ixGfBc-DMwO95PvudR6PqiJiYMHWYNHzQAzz2G3AL9co8b2oyj82l9Aln5D-bPfq-AhN4txAh3t8yIzmwh1gH05OWCxucH0_kPk_GKv5PMvwpvcPOHQbxWk_Ts1UxAHePcxDmcc--wZ_a-_JXlDrgOx5yDH2mUS0wwYQ2mGdP2qtMcI93YQxLv9o9nXmJQiMtdDjSrNXoXzvx9Mc=s0-d-e1-ft#https://s.yimg.com/vv//api/res/1.2/vZDRew8k8iNHDk22cZQEOg--/YXBwaWQ9bWFpbDtmaT1maWxsO2g9MjAwO3c9NDAw/http://forums.sailinganarchy.com/public/style_images/master_custom/meta_image.png.cf.jpg") no-repeat center rgb(0, 0, 0); height: 200px;" bgcolor="#000000">  <table style="width:100%" border="0" cellspacing="0" cellpadding="0" valign="top"> <tbody><tr> <td background="https://s.yimg.com/nq/storm/assets/enhancrV2/12/overlay-tile.png" valign="top" style="background: url("https://ci6.googleusercontent.com/proxy/Or0PpNz8Q2N-T77lb2rdWKcTmD4Aucmk2Ee_LS8DyP6g6BDF3rwx4OyZl6lsUYsZqw8AQBiEM0n0IXQQ0XX4vUAoRYgzG6vu_JFg3P_OaiyHSXs0y-U=s0-d-e1-ft#https://s.yimg.com/nq/storm/assets/enhancrV2/12/overlay-tile.png") left top; height: 200px;" bgcolor="transparent">  <table height="185" style="width:100%;height:185px;min-height:185px"> <tbody><tr> <td style="padding:15px 0px 0px 15px;text-align:left;vertical-align:top">  </td> <td style="padding:15px 15px 0px 0px;text-align:right;vertical-align:top"> <div></div> </td> </tr> </tbody></table>  </td> </tr> </tbody></table> </td> </tr> <tr> <td> <table align="center" style="background:rgb(255,255,255);border-width:1px 1px 3px;border-style:solid;border-color:rgb(224,228,233) rgb(224,228,233) rgb(0,0,0);width:95%;margin-right:auto;margin-left:auto;max-width:380px" border="0" cellspacing="0" cellpadding="0"> <tbody><tr> <td style="padding:16px 0px 16px 12px;vertical-align:top;background-color:rgb(255,255,255)">  </td> <td style="padding:16px 12px;width:99%;vertical-align:middle"> <h2 style="margin:0px 0px 4px;line-height:19px;font-family:"Helvetica Neue",Helvetica,Arial,sans-serif;font-size:16px">j22 vang bail holes, boom anarchy poll. - Fix It Anarchy</h2>  <div style="color:rgb(153,153,153);line-height:15px;font-size:11px">j22 vang bail holes, boom anarchy poll. - posted in Fix It Anarchy: Im helping a friend replace the outhaul line...</div> </td> <td style="padding:16px 12px 16px 0px;text-align:right">  </td> </tr> </tbody></table> </td> </tr> </tbody></table> </td> </tr> </tbody></table> </a></div><div><div class="h5"><div><br></div><div dir="ltr"><br></div><div><span></span></div> <div><br><br></div><div style="display:block"> <div style="font-family:HelveticaNeue-Light,Helvetica Neue Light,Helvetica Neue,Helvetica,Arial,Lucida Grande,sans-serif;font-size:13px"> <div style="font-family:HelveticaNeue,Helvetica Neue,Helvetica,Arial,Lucida Grande,sans-serif;font-size:16px"> <div dir="ltr"><font face="Arial" size="2"> On Saturday, April 30, 2016 10:27 PM, dallas--- via J22 <<a href="mailto:j22@lists.wyc.org" target="_blank">j22@lists.wyc.org</a>> wrote:<br></font></div>  <br><br> <div>The vang and main sheet bail attachment points on our boom have become elongated. <br><br>Is there a more sophisticated repair than simply drilling new holes nearby? <br><br>Sent via mobile<br>_______________________________________________<br>J22 mailing list<br><a href="mailto:J22@lists.wyc.org" target="_blank">J22@lists.wyc.org</a><br><a href="http://lists.wyc.org/mailman/listinfo/j22" target="_blank">http://lists.wyc.org/mailman/listinfo/j22</a><br><br></div>  </div> </div>  </div></div></div></div></div><br>_______________________________________________<br>
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