I think I came up with a particularly good way to fasten canvas in problem areas.. - SailNet Community
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post #1 of 22 Old 02-20-2012 Thread Starter
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I think I came up with a particularly good way to fasten canvas in problem areas..

....

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post #2 of 22 Old 02-20-2012
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Do not rest your ipod, ipad, phone or laptop on the cabin top or hatch once you have the magnets installed, and if you have a bulkhead mount compass, get it reswung. Those mags put out a hell of a field.

It's 5 o'clock somewhere:


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post #3 of 22 Old 02-20-2012
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If your compass can be adjusted against that strong a field!..Dale

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post #4 of 22 Old 02-20-2012
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Good point!
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post #5 of 22 Old 02-20-2012
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If you plan to snap down your dodger flap you are gonna need 3-4. You will also want to use a chafing guard on your dodger flap at the magnet points to prevent the flap from wearing through. BTW you don't need to sew mags into both the flap and install them in the cabin top. Sew them in the flap and screw reciever pads to the cabin top- like these:
Cups, Discs and Washers for Rare-Earth Magnets - Lee Valley Tools

The mags used in drives are smaller and there is only one.
But hey, if you don't think the field will be a problem because they are used in computers, go get a couple, slide them across your computer screen then tuck them in your wallet beside your credit cards.

It's 5 o'clock somewhere:


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post #6 of 22 Old 02-21-2012
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Chris, you don't need to get uptight- we're just trying to help.
Having a dodger and a similar hatch, I didn't understand the clearnace issue, now I do- you want the leading edge of the dodger to be ahead of the slider when it is closed. so the slider would have to slide over any fasteners there. Got it. . I just looked at the pictures of the mock-up on your blog, and I get that you want to get a nice tight seal at the leading edge of the vent flap, where it meets your hatch. Why not just install lead chain or sinkers in the hem of the flap, like is done with mosquito screens, and forgo fasteners entirely. that way you also get a tight seal when the hatch is open, in any position, and no hardware to bed in the deck.

My dodger is a little different than yours- the leading edge of ours is just aft of the leading edge of the hatch, allowing turn buttons to be installed in the hatch itself.

It's 5 o'clock somewhere:


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Last edited by bljones; 02-21-2012 at 12:40 AM. Reason: deleted big picture.
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post #7 of 22 Old 02-21-2012
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I'm in the computer business and have always been very careful of magnets. I have one of those old fashion bulk tape erasor things I bought from Radio Shack about 20 years ago. They don't carry them any more. It looks like a travel iron. You plug it in and it creates a pulsing magnetic field that was designed to erase magnetic tape.

I got the bright idea I could ruin some old hard drives so they would be erased of sensitive data before disposing but it didn't damage the data at all.

Don't know about iphones or screens but I'm pretty sure hard drives are a lot more resistant now to magnetic damage than I previously thought.
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post #8 of 22 Old 02-21-2012
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Not being negative, chris, just tossing out ideas before you get rolling rather than monday morning quarterbacking the job after it's finished.
How do you plan to open your hatch? If the hem is mated to the deck ahead of the hatch with magnets, I'm assuming the zippers will come down to the deck as well. To slide the hatch forward you are gonna need to reach forward and unzip the sides to allow the hem of the flap to slide over the hatch as the hatch slides forward.

It's 5 o'clock somewhere:


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post #9 of 22 Old 02-21-2012 Thread Starter
Sailors do like Heineken!
 
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When our hatch is open, we have maybe 3 inches or so before the dodger begins... so It'll be like our old one was - I reach forward, unzip, "lift" the flap up off the deck (the new part being unsticking the flap from the embedded magnets) and roller on up... natch.

Can you spot the irony in this pic?



(not giving you serious grief, just thought the irony was kind funny ... won't somebody think of the newbies...)
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post #10 of 22 Old 02-21-2012
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I can see the attraction (oops - sorry) of the idea. Magnets make me nervous though. Clearly your initial testing indicates that the nav compass will be okay (still would make me nervous). What about a hand bearing compass? Will you remember every time you use it to stand clear?

You're going to have to think about where to stow the hatch cover canvas covers to avoid issues.

If you wear a mechanical watch or have a quartz chronometer with metal gears keep them clear as well.

I think I'd stick with velcro on the dodger flap and drawstrings on the hatch canvas.

sail fast and eat well, dave
S/V Auspicious
AuspiciousWorks.com
beware "cut and paste" sailors.


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