Home |
Search |
Today's Posts |
#11
|
|||
|
|||
In article ,
Mic wrote: On 15 Jul 2005 18:07:31 -0700, lid (Jonathan Ganz) wrote: Link: Rigging and Sails Links http://www.tpo.net/sailing/rigging.htm Link: http://www.sailmaker.com/articles/index.htm Nice links... thanks. -- Jonathan Ganz (j gan z @ $ail no w.c=o=m) http://www.sailnow.com "If there's no wind, row." |
#12
|
|||
|
|||
In article ,
Mic wrote: On Sat, 16 Jul 2005 05:53:48 GMT, (Mic) wrote: On 15 Jul 2005 18:07:31 -0700, lid (Jonathan Ganz) wrote: Mo' Links Interesting Sail Shape Tips 6 September 2004 http://www.ipass.net/sailboat/tips.htm http://www.ipass.net/sailboat/sail101.htm "Sailing 101 The fundamentals of sailing are simple. However, if someone doesn't tell you how it's done, it could be a mystery for a long period of time. The answer in one word is balance and our sailing balance is the diagram below. Everything that's dynamic like flying and sailing or even holding a baby appears to be difficult at first. Once you understand the psychics involved in any process, the process becomes less difficult and maybe even easy. I still can't get the hang of inline skates, but I think bent knees may be the secret. " Again, good links, but not particular to fractional vs. masthead with main alone. -- Jonathan Ganz (j gan z @ $ail no w.c=o=m) http://www.sailnow.com "If there's no wind, row." |
#13
|
|||
|
|||
On 15 Jul 2005 23:48:39 -0700, lid (Jonathan Ganz)
wrote: Again, good links, but not particular to fractional vs. masthead with main alone. Mo' Links: http://www.marinearchitecture.com/fo...8&page=1&pp=15 http://cruisersforum.com/showthread.php?threadid=830 http://www.boatersed.com/forum/topic...=63707񮘔 http://www.geocities.com/bill_dietrich/BoatRigging.html http://www.transitionrig.com/feedback.htm The above is a discussion and rather lenghty http://www.jutson.com/articles/oct96.html BALANCE - THE FINE ART OF EASY SPEED http://www.uksailmakers.com/encyclop...yclopedia.html " UK's Encyclopedia of Sails -- Index Search UK's Encyclopedia of Sails: * Chapter 1 o Forward o Introduction o How to Buy a Sail o Rig Dimensions * Chapter 2 o Sail Cloth o Sail Cloth Fiber Comparison * Chapter 3 o Sail Construction Methods * Chapter 4 o Mainsails o Genoas and Other Jibs o Spinnakers o Asymetrical Spinnakers o Cruising Spinnaker (The UK Flasher) o Dousing Sock (The UK Stasher) o Staysails o Drifter o Blast Reacher o Storm Sails * Chapter 5 o Main Sail Trim o Genoa Trim o Sailing to Telltails * Chapter 6 o Spinnaker Trim o Spinnaker Jibes o Spinnaker Douses * Chapter 7 o Cruising Spinnaker Handling o Cruising Spinnaker Trim o Cruising Spinnaker Jibes * Chapter 8 o Tuning Your Rig * Chapter 9 o Sail Care o Applying Spreader Patches * Chapter 10 o Glossary" http://64.233.161.104/search?q=cache...lb oats&hl=en For the PDF Version with good diagrams TRY http://www.j22.co.za/pdf/howdosailswork.pdf "Masthead Rig. On a masthead rig, where the forestay is attached to the top of the mast and both sails taper to basically zero chordlength at their heads in a similar fashion, the interference effects of the sails on each other are similar along the entire height of the mast. The mainsail ends up being rather tightly trimmed all the way up because of the genoa’s downwash, and the genoa gains from favorable upwash all the way up. Fractional Rig. A fractional rig has the more compli-cated characteristic that the top of foresail is not as high as the top of the mainsail. This means that the top of the foresail is very close to the front of the mainsail at a height where there is still an ample amount of chordlength in the mainsail. As the foresail luff approaches the mainsail luff, the upwash on the foresail due to the mainsail increases, because the low pressure behind the mainsail has more affect the closer the flow gets to it. This causes the top of the foresail to experience even more upwash and contributes to a fractional rig’s foresail being trimmed more twisted than a masthead rig’s foresail. The top of the main on a fractional rig extends well above the foresail, leaving the upper portion of the mainsail free to experience the apparent wind without the downwash interference of the foresail. Apparent wind toward the top of the mast comes from a much higher angle, so the mainsail above the foresail experiences much higher wind angles than the lower portion of the mainsail where the genoa is causing substantial downwash. This change in flow angle with height on a mainsail is quite dramatic with a fractional rig and leads to trimming a fractional rig’s mainsail with more twist than a masthead rig’s mainsail." |