Sail draft depth position indicators

Strimar

Member
66
1
Has anyone placed draft depth position indicators on their racing mainsails and headsails to help indication approximately where the maximum draft is located on their sails?  For example 40, 45 and 50% on a main and say 25, 30 and 35% on their headsails.  If so would be interested in the markings you used.

 

Marty Gingras

Mid-range Anarchist
Has anyone placed draft depth position indicators on their racing mainsails and headsails to help indication approximately where the maximum draft is located on their sails?  For example 40, 45 and 50% on a main and say 25, 30 and 35% on their headsails.  If so would be interested in the markings you used.
If you mean something other than a draft stripe, can you give an example? 

 

ctutmark

Super Anarchist
1,739
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PNW
Lots of sails have a small vertical mark at the 50% point on the draft stripes. No reason you could not add more but it might start to get pretty busy especially with the stripes near the top of the sail. Here's a North Jib with a black tick at the 50% point 
Jib.jpg


 
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Strimar

Member
66
1
Yes this is what I meant. Think I've seen others that are just a short vertical stripe perpendicular to the draft stripe.

 

Marty Gingras

Mid-range Anarchist
Lots of sails have a small vertical mark at the 50% point on the draft stripes. No reason you could not add more but it might start to get pretty busy especially with the stripes near the top of the sail. Here's a North Jib with a black tick at the 50% point 
Thanks for that picture.  Wondering how to add one.  Do you know if the mark corresponds to 50% of the set sail's chord or if it's at 50% of the draft stripe's length?

 

ctutmark

Super Anarchist
1,739
279
PNW
Thanks for that picture.  Wondering how to add one.  Do you know if the mark corresponds to 50% of the set sail's chord or if it's at 50% of the draft stripe's length?
Typically the mark is set at 50% of the length of the stripe. Is harder to see but all three stripes in the pic have the mark. If using a camera to then analyze the draft lining up the marks is typically preferred. The marks are typically sticky back nylon or polyester in a color that is visible against the sail.  Then you snap a pic and can use something like this https://www.uksailmakers.com/accumeasure

 

Marty Gingras

Mid-range Anarchist
Typically the mark is set at 50% of the length of the stripe. Is harder to see but all three stripes in the pic have the mark. If using a camera to then analyze the draft lining up the marks is typically preferred. The marks are typically sticky back nylon or polyester in a color that is visible against the sail.  Then you snap a pic and can use something like this https://www.uksailmakers.com/accumeasure
Cool.  Thanks very much.  Will implement.

 

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