Does anyone know for sure if the rigging of a Nacra Inter 18 is designed for pre-bend mast or side bend?
I am pretty sure it is for pre-bend since the diamond wires are really thight. Just want to be absolutely sure before doing stupid things.
Thank you,
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AB
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Nacra Inter 18: Pre-bend or side bend
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Posted: May 11, 2015 - 05:43 PM
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Posted: May 12, 2015 - 01:46 AM
Pre-bend. My F18 mast and my old 5.5 SL mast were/are set the same. 450 lbs on the diamond wires and 1.5 inches of spreader rake. I would assume your Inter is similar.
What are you trying to do?
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Ron
Nacra F18
Reservoir Sailing Assn.
Brandon, Mississippi
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Posted: May 12, 2015 - 07:48 AM
Trying to learn to sail properly. I learned about those 2 type of bend this winter reading books and was convinced that the pre-bend was better. So i decided to check if the mast of my cat has any pre-bend in it and adjust if required. I haven't checked yet but wanted to be sure before inducing any bend.
Thank you.
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AB
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Posted: May 14, 2015 - 03:26 PM
Your Diamond tension on Inter 18 is relative to wind speed you need a loos gauge to set properly. The higher the wind speed for the day the tighter diamond tension. Nacra has gauge settings that are relative to wind speed I will post you mine . I have a F17 I almost positive its the same carbon mast . http://www.shopsoundboatworks.com/loprtega3.html?cmp=googleproducts&kw=loprtega3&gclid=COLh_ojtwcUCFQiRHwodJUEAqg Here is loos gauge
Diamond tension:
To measure the tension of the diamond wires, use a Loose & Co tension gauge which
you put onto the wire and let go. (the expensive one with the two wheels)
This one gives you the most accurate readings. The numbers that work on this tension meter are:
32-36, until 15 knots
36-39, from 15 to 25 knots
39-42, from 25 plus
The carbon mast is very stiff sideways and flexible fore/aft.
Hope this was helpful, contact Nacra for tension # just to be safe -
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Posted: May 14, 2015 - 05:47 PM
George,
Unfortunatetly the mast on both my Inter 18 are aluminum. As you suggest I will contact Nacra to get numbers on that.
Thank you,
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AB
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Posted: May 14, 2015 - 08:58 PM
Read up on this site it may answer some of your questions
http://loosnaples.com/how-to-use-pt-series-tension-gauges
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John Schwartz
Ventura, CA
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Posted: May 15, 2015 - 10:05 AM
I think of the diamond tension as a kind of gross adjustment and the Cunningham as a fine adjustment. Like the front vs rear derailleur on a bike.
As I learn more, we are using the Cunningham much more often (sometimes 3 - 4 adjustments on an upwind leg depending on how much the windspeed varies). Someone told me once if you are sheeting in/out more than a foot or two, then you need to put on more Cunningham.
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Jeff R
'88 H18 "Jolly Mon"
'10 C2 USA1193
NE IN / SE MI
cramsailing.com
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