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#1
posted to rec.boats.cruising
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Sail Trim
On Mon, 04 Jul 2011 23:43:13 -0500, Richard Casady
wrote: On Mon, 04 Jul 2011 07:39:01 +0700, Bruce wrote: As the purpose of the foot rope is to limit the stretch of the foot of the sail, using a nylon rope would defeat the basic reason for the roping as nylon rope has up to 40% stretch and it would be impossible to sew the rope to the sail to do this - it would mean that the foot would be 40% shorter with tension released. Just because it can be stretched to 40% elongation with_ some_ amount of force, doesn't mean that this is magically the real life figure. Been my experience with 15 to 20 foot daysailers that the bolt ropes, for all practical purposes, don't stretch much. Maybe an inch or two. Not six or seven feet. Casady Certainly. I was exaggerating in an attempt to make him stop and think. I think I even gave him a reference to a sail makers supplier who sells dacron for sail roping. I could dig out a sail makers manual and give him another reference but I doubt he'd read it. Cheers, Bruce (bruceinbangkokatgmaildotcom) |
#2
posted to rec.boats.cruising
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Sail Trim
On Tue, 05 Jul 2011 18:45:01 +0700, Bruce in Bangkok
wrote: On Mon, 04 Jul 2011 23:43:13 -0500, Richard Casady wrote: On Mon, 04 Jul 2011 07:39:01 +0700, Bruce wrote: As the purpose of the foot rope is to limit the stretch of the foot of the sail, using a nylon rope would defeat the basic reason for the roping as nylon rope has up to 40% stretch and it would be impossible to sew the rope to the sail to do this - it would mean that the foot would be 40% shorter with tension released. Just because it can be stretched to 40% elongation with_ some_ amount of force, doesn't mean that this is magically the real life figure. Been my experience with 15 to 20 foot daysailers that the bolt ropes, for all practical purposes, don't stretch much. Maybe an inch or two. Not six or seven feet. Casady Certainly. I was exaggerating in an attempt to make him stop and think. I think I even gave him a reference to a sail makers supplier who sells dacron for sail roping. I could dig out a sail makers manual and give him another reference but I doubt he'd read it. It seems obviious that the rope and should stretch the same amount or the stitches would come under strain and probably break, or tear the cloth. Casady |
#3
posted to rec.boats.cruising
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Sail Trim
On Tue, 05 Jul 2011 06:56:58 -0500, Richard Casady
wrote: On Tue, 05 Jul 2011 18:45:01 +0700, Bruce in Bangkok wrote: On Mon, 04 Jul 2011 23:43:13 -0500, Richard Casady wrote: On Mon, 04 Jul 2011 07:39:01 +0700, Bruce wrote: As the purpose of the foot rope is to limit the stretch of the foot of the sail, using a nylon rope would defeat the basic reason for the roping as nylon rope has up to 40% stretch and it would be impossible to sew the rope to the sail to do this - it would mean that the foot would be 40% shorter with tension released. Just because it can be stretched to 40% elongation with_ some_ amount of force, doesn't mean that this is magically the real life figure. Been my experience with 15 to 20 foot daysailers that the bolt ropes, for all practical purposes, don't stretch much. Maybe an inch or two. Not six or seven feet. Casady Certainly. I was exaggerating in an attempt to make him stop and think. I think I even gave him a reference to a sail makers supplier who sells dacron for sail roping. I could dig out a sail makers manual and give him another reference but I doubt he'd read it. It seems obviious that the rope and should stretch the same amount or the stitches would come under strain and probably break, or tear the cloth. Casady Usually you set up the sail with a bit of tension on it and then stretch the rope pretty tight and then sew them together. The idea is that when you put tension on the sail it doesn't tear. Most sails laying loose will show quite a bit of wrinkle along the foot as the rope contracts with no tension on it. Actually I'm not so sure that it is needed in this age as roller reefed mains don't have rope and jibs & etc. don't and the jib on my last boat was larger then the main. Cheers, Bruce (bruceinbangkokatgmaildotcom) |
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