[Alberg30] tunning, shroud tension

[John Birch]

Mike this is wonderful - I take it the measurements are in foot pounds?

Hope everyone had a great Christmas/Festive season.

John
  ----- Original Message ----- 
  From: Mike Lehman 
  To: public-list at alberg30.org 
  Sent: Thursday, December 27, 2001 8:15 AM
  Subject: Re: [Alberg30] tunning, shroud tension









  Mike Lehman 
  "Gilleleje" #505 
  (410) 544-9067 
  I couldn't find the refernce to the member list topic. Generally what I have found is to set the mast as far forward on the base as possible, This positions the mast over the beam better. Tighten the upper shrouds to equal tension keeping the top directly over the base (this takes some practice). A trick is to use the main halyard, moving it from port to starboard and measuring lining it up with a fixed object on the deck, such as turnbuckle. This will help you keep the mast plumb, side-to-side. (a word of caution: on Carnival Lady US17 the mast leaned to one side after this proceedure and Phil Beigel had a hard time figuring out why, until he pulled the boat and measured from the bottom of the keel to the toe rail on each side...one side was 3" higher than the other side! US17 was one of the original boat and a lot of things were done by hand) Now that you have equal tension on the uppers and the head of the mast is directly over the base, tighen the forward lowers until! there is 4-6" prebend at the spreaders (you are actually pulling the center of the mast forward at the spreaders with the forward lowers). Finally tighten the aft lowers just enoug to take the slop out. Attached is a a speadsheet that has the tensions recorded of several boats. The variance is so great boat-to-boat that it is hard to make sense of this without knowing the individual boats and how they perform. Racing boats are indicated by an "R" and generally carry a taughter rig. Hope this helps, at least it's something to ponder over the cold winter months.






  Mike Lehman 
  "Gilleleje" #505 
  (410) 544-9067 
  ----Original Message Follows---- 
  From: Brian and Elaine Timmins 
  Reply-To: public-list at alberg30.org 
  To: public-list at alberg30.org 
  Subject: Re: [Alberg30] tunning, shroud tension 
  Date: Wed, 26 Dec 2001 21:41:14 -0500 
  Check members list, May 1 (digest of May 2), 2001 
  Topic.... "Alberg 30 Tensions" 
  I used this as a guideline when tuning my boat this past season. It worked 
  VERY WELL!!! 
  I ended up 1st in class under PHRF in my club. Also had highest point count 
  of the entire fleet. Admittedly we're a small group of freindly racers, not 
  grand prix. 
  Regards, 
  Brian #497 
  ----- Original Message ----- 
  From: 
  To: 
  Cc: 
  Sent: Wednesday, December 26, 2001 5:37 PM 
  Subject: [Alberg30] tunning, shroud tension 
  > In the two summers I have sailed my A30 I have focused on things other 
  than tuning and shroud tension. I have sailed with a straight up mast, 
  "tight" uppers and slightly "looser" lowers. I am speaking "loosely" of 
  course. I have managed to maintain a helm that is nicely balanced when even 
  heeled and turns strongly to windward when healing angle is increased. And 
  I am naturally happy with these results. 
  > 
  > Sometimes when sailing to windward I feel I am not performing as well as I 
  should, not pointing as high nor making the speed I should. My main sail 
  seems very full also, too full--slot choking full, as if it were cut for a 
  mast with some fore aft pre-bend tuned into it. Sailing with a relatively 
  less experienced crew (my wife) and without another A30 as a pace boat, it 
  has been difficult to answer my own performance questions. (My sails aren't 
  brand new nor are they blown out--at least from a non-top-of-the-fleet 
  racing point of view). 
  > 
  > What I'd like to know is whether a straight mast is the standard. Or is 
  it common for A30s to tune the mast with a small 4"-6" fore-aft prebend in 
  it, as I often see in other keelboats. Second what range of tensions are 
  common among racers and cruisers. I don't have, nor do I plan to get soon, 
  an adjustable backstay. If anyone has any thoughts to offer on these 
  questions I'd appreciate it. (Also I have an older boat, #88, and have 
  already had my mast beam reinforced. While I'm not looking to drive the 
  mast down through the deck, I don't think planning my sailing around a 
  weakness that can be repaired if it reappears is this way to go either.) 
  > 
  > I think I saw some time back an informal survey complied by Mike Lehman of 
  various boat's shroud tension(s). I can't find this anywhere in the 
  archive. Does anyone remember when or where this information is archived? 
  Or Mike do you still have this info? In a form that can be posted? 
  > 
  > Thanks 
  > 
  > John Grathwol 
  > Dovekei #88 
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