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Remove early Nacra 5.2 knee knocker? #34924
06/29/04 04:49 PM
06/29/04 04:49 PM

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It is about time for a new tramp and although I do not mind the brace down the center between the beams, it sure would be nice to have the additional room on the tramp.

I have read on previous posts that putting a rivit or two through the stainless retaining strap would take care of any beam rotation. (What about a couple of small stainless bolts?) Has anyone done it this way. Does the bar actually add to the stiffness of the boat? How did the factory work around the bar on the newer 5.2's.

I am planning on making my own tramp. I have made several sunbrella projects such as boat covers, main sail covers, jib snokle, etc. I have a Sailrite machine and am actually looking forward to the project. I am planning on using my old tramp for a pattern and would like to add some of the storage ideas that have been in some of the previous posts. If anyone has any suggestions, I am well open to them.

Thanks
Terry

-- Have You Seen This? --
Re: Remove early Nacra 5.2 knee knocker? [Re: ] #34925
06/30/04 06:29 AM
06/30/04 06:29 AM
Joined: Jun 2001
Posts: 12,310
South Carolina
Jake Offline
Carpal Tunnel
Jake  Offline
Carpal Tunnel

Joined: Jun 2001
Posts: 12,310
South Carolina
Terry,

The only purpose of that center bar was to prevent rotation of the fore and aft cross beams. Later boats (all Nacras to this day) have a large bolt that goes from the center of the beam (at each end) and threads into a brass plate in the hull.

I've heard of 5.2s successfully removing the bar and installing small stainless screws successfully - but I never did modify mine in this way. I just got used to the bar (and kind of missed it when I upgraded to my 6.0).


Jake Kohl
Re: Remove early Nacra 5.2 knee knocker? [Re: Jake] #34926
06/30/04 08:53 AM
06/30/04 08:53 AM
Joined: Oct 2002
Posts: 606
Maryland
Kris Hathaway Offline
addict
Kris Hathaway  Offline
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Joined: Oct 2002
Posts: 606
Maryland
I kinda miss that bar too. Something to catch your feet on for that unplanned tramp surfing.


Kris Hathaway
Re: Remove early Nacra 5.2 knee knocker? [Re: ] #34927
06/30/04 10:31 AM
06/30/04 10:31 AM
Joined: Nov 2003
Posts: 99
Chicago, IL
Krisu13 Offline
journeyman
Krisu13  Offline
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Joined: Nov 2003
Posts: 99
Chicago, IL
What material (fabric) do you use to make your trampoline and where do you get it?

Kris


I20
Re: Remove early Nacra 5.2 knee knocker? [Re: Krisu13] #34928
06/30/04 11:42 AM
06/30/04 11:42 AM

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Sailrite has a lot of stuff. Check the link below
http://secure.sailrite.com/value/it...;Cc=MESH&iTpStatus=0&Tp=&Bc=

If the link does not work, go to http://www.sailrite.com/ , then select "Online Shopping". On the port side of the Shopping page, select Catagory "Fabrics". There you will find "Mesh & Netting". There, you will find "Trampoline Mesh".

Terry

Last edited by tdannar; 06/30/04 02:53 PM.
I did it with success [Re: ] #34929
06/30/04 02:41 PM
06/30/04 02:41 PM
Joined: Jul 2001
Posts: 1,253
Columbia South Carolina, USA
dave mosley Offline
veteran
dave mosley  Offline
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Joined: Jul 2001
Posts: 1,253
Columbia South Carolina, USA
I removed the bar and replaced the tramp on my 1976 5.2 and it still is together and sailing today. I initially tried to put a SS rivet thru the straps, but they got sheered off, or even worse, weakened the strap. I eventually just snugged up the beam starp and watched them closely. d dont recall them sliding out of place, but they definitely flex enough to sheer the rivet and weaken the strap.

Good Luck,
David


The men were amazed, and said, "What kind of a man is this, that even the winds and the sea obey Him?" Matthew 8:27





Re: I did it with success [Re: dave mosley] #34930
07/01/04 01:43 AM
07/01/04 01:43 AM
Joined: Oct 2002
Posts: 82
Minneapolis, Mn
Wrinkledpants Offline
journeyman
Wrinkledpants  Offline
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Joined: Oct 2002
Posts: 82
Minneapolis, Mn
I spoke to someone at the nacra factory and they told me to put four rivets through each u clamp into the crossbar. So eight rivets per bar. Works great, no shearing and still stiff. He also said bolts would work just as fine if not better, it just might be better to have flush rivet heads rather than bolt heads sticking out of your cross bars.


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