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 Post subject: reducing beam on HC16
PostPosted: Sun Mar 12, 2017 1:35 am 
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Joined: Tue Jan 03, 2017 6:08 am
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Hi, I am currently customizing a HC16 as a Rowing/Sailing Cat.

The rigging will change but I am at the beginning.
I took apart the beams reduced them of 30cm each side (sorry for the metric system I am french) this will give a total beam of 1m60 for the platform which is suitable to install a proper sculling position.

1) I now need to reassemble the platform and i have a few question. It seems the rivets where stainless steel 4,8 x 16 mm.
However i now see that there are many possibilities (large head, waterproof, cupronickel ...) could you advise ?
Would going to aluminium rivets (maybe larger diameter) do ? There is the corrosion problem also ... ?

2) Because the front beam is curved, the extrimities now do not fit well in the casting. Is it possible to straigthen them using a
vise and heating ?

Thanks for your help
JD


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PostPosted: Sun Mar 12, 2017 6:02 pm 
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Joined: Mon Jul 14, 2003 7:11 pm
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Location: Detroit, MI
Rivets are stainless steel or Monel.

Straightening the front crossbeam will be difficult. Cold forming may crack or collapse the extrusion. Heat will remove the temper - but that may not be an issue since you have removed the sailing loads by turning it into a sculling platform.

Pack the extrusion with sand to keep it from collapsing, use heat sparingly and go slowly, preferably with a hydraulic bender.


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PostPosted: Sun Mar 12, 2017 6:30 pm 
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Location: Jersey Shore
Your other option would be to find another rear crossbar and corner castings and use a rear crossbar in the front. Since the rear crossbars are not curved, you shouldn't have any alignment issues.

sm


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PostPosted: Mon Mar 13, 2017 11:57 am 
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Joined: Fri May 01, 2015 9:49 am
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From the first post, I got the impression that the goal was to be able to row it or sail it.


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PostPosted: Mon Mar 13, 2017 6:39 pm 
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Location: Jersey Shore
leecea wrote:
From the first post, I got the impression that the goal was to be able to row it or sail it.


Understood, but it's a custom job either way you look at it. Probably easier to figure out how to rig a mast step on a rear crossbar than to figure out how to successfully straighten a front crossbar. Drive over it with the wheel of your car maybe?

sm


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PostPosted: Fri Mar 17, 2017 1:27 am 
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Thanks for all the tips.
Yes it is a ROW+SAIL boat and keeping the front beam curved structure (with the reinforcement bar below) sounds a good idea
to hold the mast.
If I were rich I would replace the cross beams by Carbone tube, maybe later the result sounds worth it.


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PostPosted: Fri Mar 17, 2017 4:55 am 
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jdb666 wrote:
Yes it is a ROW+SAIL boat and keeping the front beam curved structure (with the reinforcement bar below) sounds a good idea
to hold the mast.

You cannot seriously be considering the original mast and sail plan on a platform that's only 1.6m (5.25 feet) wide?

The boat will be very unstable - and almost impossible to right if it does capsize. Even a Hobie 14's rig would be large for something that narrow.


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PostPosted: Fri Mar 17, 2017 6:49 am 
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Hi , no of course the rigging will be completely new
it will be a 6m60 standalone carbon mast with furling sail (no boom) + a code0 genaker
Thanks for worrying for me !


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