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Old 01-07-2021, 07:37 PM   #1
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Boat arch

Good evening fellow TFers and happy new year to you all, may you be happy, healthy and wealthy.
My boat has a fix arch that makes its air draft about 14 feet. Add to this its draft of about 3 feet and total height is about 17 feet what does not allow me to move it by road (bridge, power lines etc).
Discussing with my wife I was telling her that it would be nice to be able to move the boat to our house in spring so to have it nearby to be able to work on it every day or evening without having to drive 30min to the marina.
So I started to think about cutting the arch and make it foldable. The arch is supporting the radar, anchor light, radar reflector, one vhf antenna, one gps receiver, and the wifi booster antenna so 5 cable.

So here my question: cutting the arch to make it foldable, good or bad idea?

L
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Old 01-07-2021, 08:03 PM   #2
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Radar cables are usually long so - 10m is normally the shortest so you may have a coil somewhere. GPS could be replaced with a new one if not long enough. Wifi boost is probably an ether net cable so not difficult.

The hinges will almost certainly need to be custom made. And not cheap. Unless you know someone to do it as a favor, would not be surprised if they are over a couple grand by the time they're done and polished.

But it's doable. Would be cool to have the boat in your backyard. Also being truckable would expand your resale market if the boat is not planned on being your coffin, which is my plan.

Keep us posted. Intriguing project.

Peter
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Old 01-07-2021, 08:07 PM   #3
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Originally Posted by mvweebles View Post
Radar cables are usually long so - 10m is normally the shortest so you may have a coil somewhere. GPS could be replaced with a new one if not long enough. Wifi boost is probably an ether net cable so not difficult.

The hinges will almost certainly need to be custom made. And not cheap. Unless you know someone to do it as a favor, would not be surprised if they are over a couple grand by the time they're done and polished.

But it's doable. Would be cool to have the boat in your backyard. Also being truckable would expand your resale market if the boat is not planned on being your coffin, which is my plan.

Keep us posted. Intriguing project.

Peter
It is my plan too but would be nice to be able to move the coffin before being buried

L
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Old 01-07-2021, 08:12 PM   #4
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The hull door on my Willard 36 swung outboard. Huge nuisance as it would always catch on a floating dock. Hinges were separable so it would lift the door off and put it at risk of floating away. Plus, being out-swing, was a safety risk if anyone leaned against it. So as part of my refit, I had it converted to an in swing which was deceptively complicate at the angle on the opening side of door needed to be reversed.

Where am I going with this? Hinges were pretty expensive to have fabricated, even in Mexico. Over $500 for polished stainless.

Good luck. Good plan on selling coffin before you're buried.

Peter
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Old 01-07-2021, 08:17 PM   #5
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The arch on the boat in my avatar was hinged. The hinges were custom made stainless. The arch itself was reinforced on the inside where the hinges attach. We also installed 12 vdc linear actuators that would fold - unfold the arch with a switch on the helm.
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Old 01-07-2021, 08:28 PM   #6
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I’ve been able to cobble most of my boat hardware together from home-made or production hardware meant for something else, including polished 316 SS hinges. Show us a photo of where you would would like to hinge the arch and maybe we’ll have a decent reference of an existing product.

An application such as yours shouldn’t require a constant usage bearing surface or an expensive high-wear product. A heavily built but simple bolt or pin & loop device made of 316 SS should do the job. SS Semi-trailer door, refer door or gate hinges might make a decent alternative.
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Old 01-07-2021, 08:51 PM   #7
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The arch on my North Pacific 39 was hinged for folding. Maybe contact Trevor Brice at North Pacific Yachts.

https://northpacificyachts.com/contact

Rob
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Old 01-07-2021, 08:52 PM   #8
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Quote:
Originally Posted by Ka_sea_ta View Post
The arch on the boat in my avatar was hinged. The hinges were custom made stainless. The arch itself was reinforced on the inside where the hinges attach. We also installed 12 vdc linear actuators that would fold - unfold the arch with a switch on the helm.
I was thinking about 12v actuators too if I can fit them.

L
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Old 01-07-2021, 08:54 PM   #9
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Originally Posted by healhustler View Post
I’ve been able to cobble most of my boat hardware together from home-made or production hardware meant for something else, including polished 316 SS hinges. Show us a photo of where you would would like to hinge the arch and maybe we’ll have a decent reference of an existing product.

An application such as yours shouldn’t require a constant usage bearing surface or an expensive high-wear product. A heavily built but simple bolt or pin & loop device made of 316 SS should do the job. SS Semi-trailer door, refer door or gate hinges might make a decent alternative.
Will post a photo along with a drawing of what I think would be my plan tomorrow.

?
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Old 01-07-2021, 09:09 PM   #10
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My boat stores in a barn 1 mile down the road from our house so access is easy. Have you thought about instead of hinging the arch maybe modify the mounts so that you can just unbolt the arch. Maybe have a pin or bolt sticking through the arch from where it mounts on the boat. The pin could be used as a pivot point to let the arch lay down. Then just unbolt the arch and let it rotate down and up as needed. No custom made hinges needed this way. Maybe all off the shelf parts would do it.
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Old 01-07-2021, 09:30 PM   #11
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Originally Posted by Comodave View Post
My boat stores in a barn 1 mile down the road from our house so access is easy. Have you thought about instead of hinging the arch maybe modify the mounts so that you can just unbolt the arch. Maybe have a pin or bolt sticking through the arch from where it mounts on the boat. The pin could be used as a pivot point to let the arch lay down. Then just unbolt the arch and let it rotate down and up as needed. No custom made hinges needed this way. Maybe all off the shelf parts would do it.
Good idea did not think about that, it may be a good option knowing that I won't lower it often.

L
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Old 01-07-2021, 09:39 PM   #12
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My mast is hinged at its bases, but best raised and lowered with a crane.
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Old 01-07-2021, 10:16 PM   #13
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Originally Posted by Lou_tribal View Post
Good idea did not think about that, it may be a good option knowing that I won't lower it often.

L
It may be an easier method to do as a refit. From new the hinges would be the most elegant solution but now it will be very costly to manufacture a custom hinge.
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Old 01-08-2021, 09:43 AM   #14
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Here is a picture of the boat showing the arch:

Click image for larger version

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And here is a drawing of what is my intent, sorry it is not at scale but at least it shows the idea.

Click image for larger version

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L
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Old 01-08-2021, 10:00 AM   #15
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A pin setup to pivot on would likely work. Or, if you leave enough slack in the cables or can add a way to disconnect them at the base of the arch, you could detach it entirely, lay it down on the deck behind where it mounts (or against the rails) and strap it down.
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Old 01-08-2021, 10:00 AM   #16
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Our boat (in the avatar) has a hinged arch - it will hinge both forward and backward - really cool hinge setup. But with our bimini and enclosure attached to the arch, along with electronics, we have never 'hinged' it either way. That sucker will be heavy also.
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Old 01-08-2021, 10:12 AM   #17
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Quote:
Originally Posted by Comodave View Post
My boat stores in a barn 1 mile down the road from our house so access is easy. Have you thought about instead of hinging the arch maybe modify the mounts so that you can just unbolt the arch. Maybe have a pin or bolt sticking through the arch from where it mounts on the boat. The pin could be used as a pivot point to let the arch lay down. Then just unbolt the arch and let it rotate down and up as needed. No custom made hinges needed this way. Maybe all off the shelf parts would do it.
This is exactly what we did with our past boat for moving it to our home and back twice a year - worked out great and was fairly easy to do.
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Old 01-08-2021, 12:36 PM   #18
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I would do it in a heartbeat

However, I am a retired mechanical design engineer skilled in the fabrication of all sorts of hardware using a wide range of materials. It all depends on your design ability and skills. The possibility of my ever owning a boat with a flying bridge is remote. I simply do niot like them.
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Old 01-08-2021, 12:44 PM   #19
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However, I am a retired mechanical design engineer skilled in the fabrication of all sorts of hardware using a wide range of materials. It all depends on your design ability and skills. The possibility of my ever owning a boat with a flying bridge is remote. I simply do niot like them.
To each his own.
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Old 01-08-2021, 01:28 PM   #20
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This is exactly what we did with our past boat for moving it to our home and back twice a year - worked out great and was fairly easy to do.
I like your trailer, do you store your boat on the trailer?
May I ask what is a price envelope for a trailer?

L
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