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PostPosted: Sun Jan 05, 2014 6:17 pm 
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Location: Jerrabomberra, New South Wales, Australia
Mine is worn too, not particularly phased about it though.


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PostPosted: Mon Apr 07, 2014 5:08 am 
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Location: Forster, NSW, Australia
I have carried out extensive investigation regarding the relationship between wear on the top bearing plate and the other components.

Please let us be 100% clear on this... The mast bearing plate (and the ring it is mounted in) IS NOT DESIGNED TO TAKE THE WEIGHT OF THE MAST. Even a cursory look would confirm that no engineer would design a system where a weight-bearing ring is only supported on one side. The bearing plate(s) are there solely to support the 24 delrin balls with HORIZONTAL loads.

As an aside, I wonder if this might have been an issue with those very few crossbars where the weld holding the ring was showing cracks....

So if your top bearing plate looks like this below, go straight to your Hobie dealer, as this is a symptom of a problem. Remember also, that the V2 mast receiver/v brace assembly cannot be adjusted by more than one or two milimetres (basically be distorting the components), unlike the earlier versions. The fix might need a new bottom half mast, or a longer pin in the bottom of the mast receiver.
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2012 Tandem Island "SIC EM"
www.scenefromabove.com.au


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PostPosted: Mon Apr 07, 2014 7:20 am 
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Location: High Point, NC
Some of the evident wear in the photo is caused by the movement of the mast when being furled/unfurled owing to the generous clearance designed into that opening. Mine shows a bit of this, but perhaps not quite this much. No doubt too much of this sort of thing could result in damage.

Of course, it's certainly true that the pin/base at the bottom of the mast receptacle is intended to carry the weight/load of the mast and sail.

The reason you often see differences in the mast bearing plate to furling drum clearance is due to drums not always affixed in exactly the same place, and the fact that these plastic hulls are not exactly precision pieces. The height of your TI's deck may be, and probably is, different that height of my TI's deck. As Tony said, the V-truss adjustment only affects mast base top height by distorting the otherwise natural position of the hull/components. It wasn't designed to correct terribly ill-fitting parts and pieces.


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PostPosted: Mon Apr 07, 2014 8:40 am 
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The owner of that AI had stated that he had only used it a few times, so I therefore assumed this was a serious case of incorrect distance between furling drum and bottom pin, so the wear was much more than the odd scrape.

Yes Tom, the unfortunate thing is that some dealers did not seem to be aware of the existence of the V2 mast assembly, which is effectively a single unit once the two bolts through the crossbar are done up. This was a running change to AIs (and I believe OEM for TIs from the outset), and only the V1 assemblies can adjust the clearance via the turnbuckles.

Hopefully word will get out to all dealers so users are not cast aside with incorrect advice to "Adjust the turnbuckles" when the assembly is a V2.

I believe the Aussie dealers are now up to speed, and I assume those elsewhere will be soon, if not already.

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2012 Tandem Island "SIC EM"
www.scenefromabove.com.au


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PostPosted: Tue May 06, 2014 1:42 pm 
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Location: Western MA
So I am still somewhat confused here.

I have a 2012 Tandem Island. I am having the same issue with the furler drum resting on the bearing race ring. It causes considerable resistance and I have wear similar to what has been shown above. I think I have read through all of these posts but am still unsure. On my boat the hull is pushed outward on the bottom slightly by the V brace. It would seem that there should be a way to adjust the V brace to gain more clearance for the mast and reduce the pressure placed on the bottom of the hull by the V brace. Do I need to try to adjust the furler drum instead?

Thanks,
Adam

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PostPosted: Tue May 06, 2014 2:11 pm 
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sologarth wrote:
So I am still somewhat confused here.

I have a 2012 Tandem Island. I am having the same issue with the furler drum resting on the bearing race ring. It causes considerable resistance and I have wear similar to what has been shown above. I think I have read through all of these posts but am still unsure. On my boat the hull is pushed outward on the bottom slightly by the V brace. It would seem that there should be a way to adjust the V brace to gain more clearance for the mast and reduce the pressure placed on the bottom of the hull by the V brace. Do I need to try to adjust the furler drum instead?

Thanks,
Adam

Adam, do not attempt to adjust the V-brace to move the furling drum higher (although your particular TI might already have too much tension on the v-brace causing hull distortion, caused by someone (the dealer?) erroneously trying to lessen the rubbing of the furling drum).

As I stated above, on the TI (and on V2 versions of the AI mast base), the mast receiver is bolted rigidly to the crossbar, so changing the length of the v-brace can only affect the depth of the mast receiver by distorting the assembly, which is NOT good.

You should take your TI to your dealer, and if they suggst increasing clearance of the furling drum by adjusting the v-brace, politely inform them that Matt Miller, David Ketterman (designer of the Miragdrive) and Steve Fields (CEO of Hobiecat Australasia) and others have all stated that adjusting the v-brace is not the solution (for more than a tiny amount of variation).

Correction is without doubt a warranty issue.

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2012 Tandem Island "SIC EM"
www.scenefromabove.com.au


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PostPosted: Tue May 06, 2014 4:28 pm 
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Alright thanks. Not sure what I will do here as when I spoke to the Hobie dealer he recommended adjusting the brace. I also believe I am outside my warranty. It's too bad that these issues aren't better understood and/or addressed by the dealer and factory. I'll have to check on that.

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PostPosted: Tue May 06, 2014 7:29 pm 
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Location: Forster, NSW, Australia
sologarth wrote:
Alright thanks. Not sure what I will do here as when I spoke to the Hobie dealer he recommended adjusting the brace. I also believe I am outside my warranty. It's too bad that these issues aren't better understood and/or addressed by the dealer and factory. I'll have to check on that.

I would suggest that he check with head office as his information is absolutely definitely incorrect. Even if you are a bit outside your warranty, Hobie should address this the same as they do any other issue not caused by user misuse.

I would like to think that Hobie will issue a service bulletin to all dealers to finally kill off the myth that big adjustments can be made by changing the lengths of the v-braces. You there Matt?

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Tony Stott
2012 Tandem Island "SIC EM"
www.scenefromabove.com.au


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