Mast pre-bend

Status
Not open for further replies.
Feb 27, 2004
142
Hunter 29.5 Lake Travis, TX
Hi Brion, I appreciate all of the rigging information that you are giving us. The Hunter B&R system is appearing to be more complicated than most realize including myself. I have a h29.5 with no backstay, fractional, large roach main with full battens, small 110 jib, two sweptback spreaders and six continuous wires to the deck. Some h29.5's have only one spreader. After tunning my rigging several times I have found that the amount of pre-bend dramatically affects the mainsail shape. The Hunter manual recommends 4 - 6". I can only get about 3" and would like to get a couple of more and the local sailmaker says I need more. I have the correct rake of 12 - 16". In your response to Ian McGain's question you mentioned that continuous wires should not be tensioned the same. That is exactly what I have discovered. I currently have the uppers at 15%, the intermediates at 8% and lowers at 5%. This is what was needed to maximize the pre-bend. How can I get more pre-bend and what is the relationship of the intermediate and lower wire tensions to the pre-bend. Thanks for your help, Monty
 
B

Brion Toss

Getting bend

Hello, I wish I knew Hunter's models better, but if you have six wires to deck, it doesn't sound like a B&R. Do you have diamond stays (angling up and out) as well as diagonals and verticals? Is the rigging discontinuous?. Fair leads, Brion Toss
 
M

Monty Miller

More info..

Brion, First wire(1/4") goes from deck to outer edge of lower spreader up to outer edge of upper spreader to near top of mast. Second wire (7/32") goes from deck to outer edge of lower spreader up to mast below upper spreader. Third wire (1/4")goes from deck to mast below lower spreader. There are no diamond stays. Thanks, Monty
 

Alan

.
Jun 2, 2004
4,174
Hunter 35.5 LI, NY
Paul Akers

No backstay has nothing to do with whether or not it's a B&R rig. True some B&R rigs do not have backstays and some do. The diagonals and the discontinuous stays are the key points.
 
Feb 27, 2004
142
Hunter 29.5 Lake Travis, TX
My error?

Forgive me, I may have used the term B&R incorrectly. Does anyone have a short, crystal clear definition. Some of us seem to be in the dark on this but please don't bring weapons, terrorism, or religion to this table.
 
Dec 3, 2003
2,101
Hunter Legend 37 Portsmouth, RI
Alan - but my point is...

...if it's a Hunter without a backstay, then you can probably bet that it's a B&R rig. (Unless there is some sort of custom modification). :)
 
B

Brion Toss

Okay then...

Hi again, You definitely do not have a B&R rig, but a different, probably less efficient way of accomplishing aft staying. It's also less effective at inducing prebend, as the angles formed by the uppers and intermediates over the spreaders are shallow compared to the angles that diamonds/diagonals can form. I'd try tuning this much like a B&R, in that I'd start at the top, inducing a somewhat exaggerated bend, and arrest and shape it with first the intermediates, then the lowers. You probably won't get as much forestay tension as with a B&R, and you certainly won't get as much bend. Have to say, this is quite an unusual rig; any chance that there was a vestigial backstay, that has been removed? Fair leads, Brion Toss
 

Alan

.
Jun 2, 2004
4,174
Hunter 35.5 LI, NY
Just add to the confusion...

...it appears that the 29.5 came in 2 versions, single and double spreaders. Single spreaders are B&R rig, doubles are not.
 
Status
Not open for further replies.