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dophine Striker Tension? #225753
12/21/10 06:25 AM
12/21/10 06:25 AM
Joined: May 2007
Posts: 416
Matt_Stone Offline OP
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Matt_Stone  Offline OP
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hey peoples
how many mm is the common prebend in the front beam?
mine is a 4mm prebend now i think i need take 2mm out still.
when mast is off is there any tension on the strap?
does it make a "ting" or a "Tong"
matt UNKO

-- Have You Seen This? --
Re: dophine Striker Tension? [Re: Matt_Stone] #225866
12/24/10 04:27 AM
12/24/10 04:27 AM

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thricebitten
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Geez Matt,

I have never measured it, just set it up with slight upwards bend, something I haven't checked since, anothe job on my list cry.

Re: dophine Striker Tension? [Re: ] #225867
12/24/10 06:08 AM
12/24/10 06:08 AM
Joined: May 2007
Posts: 416
Matt_Stone Offline OP
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Matt_Stone  Offline OP
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i had to take mine apart,i have 4mm bend but it looks to much, i prob want it on 2mm bend

Re: dophine Striker Tension? [Re: Matt_Stone] #225911
12/27/10 05:36 AM
12/27/10 05:36 AM
Joined: Oct 2010
Posts: 92
South Oz
Phillip Offline
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Phillip  Offline
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Posts: 92
South Oz
Rig boat, hoist mainsail, apply average sailing tension to luff downhaul and leech mainsheet. Sight along mainbeam, should not dip down at all. Apply extreme tensions and check again. If there is a dip, release all tension and tighten the striker system to increase beam prebend. I use 5mm for sloop and 4 mm for cat rig, sailing in rough waters though. CU at Nats.

Last edited by Phillip; 12/27/10 05:39 AM.

Tortured ply is clearly beautiful.
Mozzie Aldebaran VI
1827
Re: dophine Striker Tension? [Re: Phillip] #226893
01/17/11 03:04 AM
01/17/11 03:04 AM
Joined: Jan 2011
Posts: 4
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whitney01 Offline
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whitney01  Offline
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What are the pros and cons having a 4mm prebend?

Keepsake Urns

Re: dophine Striker Tension? [Re: whitney01] #226894
01/17/11 06:34 AM
01/17/11 06:34 AM
Joined: Jan 2006
Posts: 556
Somers, Westernport Bay, Victo...
Peter_Foulsum Offline
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Somers, Westernport Bay, Victo...
Hi Whitney,

From my perspective the Pros are:

Aluminium front beam always remains in tension so is not subject to cyclic bending stress loading through it's neutral axis and therefore lasts longer.

There is a slight inward camber on the centreboards which may provide an increasing lift force when heeling and flying a hull. crazy This may also be transferred to the rudders if they are aligned with the centreboards.

Cons:

Front beam and rear beams are not perfectly aligned so there is some induced stress through the hulls when the rig is tensioned. Either way with positive or no camber there will be some stress induced but the hulls are sufficiently strong enough to cope.

These may be just ramblings of an idle mind but hey isn't that why we have forums; to get ideas out there for discussion. grin

Regards,

Peter


Mosquito 1814
Macka Mozzie
Re: dophine Striker Tension? [Re: Peter_Foulsum] #227037
01/19/11 12:45 AM
01/19/11 12:45 AM

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Hi Peter,

sounds fair to me, allways good to hear from you. Good to know you're still out there wink.


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