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Nacra mainbeam and dolphin striker #138502
03/31/08 03:36 PM
03/31/08 03:36 PM

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I have recently reassembled the main beam on my Nacra 5.8. The original mast bolt was bent and needed replacing. I need to know how to tension the striker and what torsion should the main beam have. Anyone know?

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Re: Nacra mainbeam and dolphin striker [Re: ] #138503
03/31/08 08:14 PM
03/31/08 08:14 PM
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According to the factory, 3/8 inches of prebend on the front beam.


Philip
USA #1006
Re: Nacra mainbeam and dolphin striker [Re: P.M.] #138504
03/31/08 08:19 PM
03/31/08 08:19 PM

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Thanks for the reply mummp.

Where did you get that information? Since I am reassembling the cat, I would find that source valuable.

How would you measure a prebend of 3/8"?

Re: Nacra mainbeam and dolphin striker [Re: ] #138505
03/31/08 11:12 PM
03/31/08 11:12 PM
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Make a straight line from end to end of crossbeam, without mast in place. The ends of crossbeam should be lower than middle by amount of prebend.


Jim Casto
NACRA 5.5 & NACRA 5.7
Austin TX
Lake Travis
Re: Nacra mainbeam and dolphin striker [Re: ] #138506
04/01/08 08:50 AM
04/01/08 08:50 AM
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Tobin,
Keep it simple, with no load on the beam your beam should be level and/or "straight", then simply screw the lower nut up 3/8 in. and then tighten your upper nut. Just curious, after you straightened the rod, did you put a compression tube back inside the beam? If you did I hope you marine greased the snot out of it. . .


Philip
USA #1006
Re: Nacra mainbeam and dolphin striker [Re: P.M.] #138507
04/01/08 03:23 PM
04/01/08 03:23 PM

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I didn't, but i reassembeled it just a week ago and haven't tightened it yet. Where should I grease the snot out of it? And why?

Re: Nacra mainbeam and dolphin striker [Re: ] #138508
04/01/08 04:58 PM
04/01/08 04:58 PM
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Where the stainless sleeve comes into contact with the aluminum crossbar due to electrolosys (sp) that will occour there.


Collin Casey
Infusion Platform + C2 rig and rags = one fast cookie
Re: Nacra mainbeam and dolphin striker [Re: ] #138509
04/01/08 05:17 PM
04/01/08 05:17 PM
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Florida Suncoast, Dunedin Caus...
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And this is the best stuff to use. tefgel


Have Fun
Re: Nacra mainbeam and dolphin striker [Re: JACKFLASH] #138510
04/01/08 06:24 PM
04/01/08 06:24 PM
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. . . . and also the inside of the compression tube.


Philip
USA #1006

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