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Old 05-27-2015, 12:44 PM   #41
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No "weirdness" on my laptop.
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Old 05-27-2015, 01:00 PM   #42
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wyoboater,
My FB and yahoo are fine ..... not weird. Doan know. As a side we were at the Apple Store yesterday and all my stuff wS plugged in and messed w so ??????

In this post anybody seeing the pic of Kevin's anchor on the float?
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Old 05-27-2015, 09:47 PM   #43
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Al, here's a thought, on the offending jack adding weight to the jack will dampen some of the vibration. You might try clamping several shaft zincs around the shaft. If you can get enough weight on the jack it will reduce the vibration. It takes energy to move weight. Some or maybe all energy in the vibration will be used up moving the weight of the zincs.
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Old 05-27-2015, 10:19 PM   #44
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Inflated small fender on top or bottom. Secure items into place as appropriate. Air pressure as required.
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Old 05-27-2015, 11:31 PM   #45
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Quote:
Originally Posted by FlyWright View Post
The sag is a common issue with Californians and several of us have added supports to cure the sag.
I hear there are medications that may help.
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Old 07-17-2015, 05:49 PM   #46
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Just a brief followup to my post about the increased vibes at the lower helm after tightening the supports.

Giggitoni and I went out on a short 1 hr run to test my recent cooling system flush with Barnacle Buster and noted the vibes on the way down the Mare Island Strait. After turning around, I descended into the ER to adjust the offending support.

I relaxed the compression on the fwd stbd support and found that the vibes disappeared yet the floor retains its raised position. Apparently this is due to the support being provided by the other 3 supports. So rather than install vibration dampening add-ons, I'll live with it like this for a while and see how well it does.

Thanks all for the helpful suggestions and advice.
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Old 07-17-2015, 06:54 PM   #47
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Lookin' forward for a ride on FlyWright with reduced vibration, especially at idle.


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Old 07-17-2015, 07:07 PM   #48
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Lookin' forward for a ride on FlyWright with reduced vibration, especially at idle.
Don't expect much difference at idle, Mark. They are twin 4-cyl Perkins. It's what they are supposed to do at idle.
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Old 07-18-2015, 01:27 PM   #49
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Don't expect much difference at idle, Mark. They are twin 4-cyl Perkins. It's what they are supposed to do at idle.
Ha Ha. . .
You should see what that idling does to the two 9' long windows in the 38' and 42' aft cabin models. With both engines at idle, the glass vibration could scramble an egg.
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Old 07-18-2015, 05:41 PM   #50
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Stanchions like the ones you had fabricated are common on larger yachts and seem to do what you intended them to do, awesome, and nicely done.

An old school trick to reduce vibration transmission is to fill the stanchions with sand, sounds weird but really works.

As mentioned, Sylomer vibration isolation foam of the correct density (the grey or red versions) would also reduce vibration transmission. Comes 1/2" thick but you can trim the sides as long as you keep 1/2" in the load bearing part of the device. Any poly adhesive works with it.

As has been mentioned, isolation mounts are also common in this application. The mount typically used is similar to these BRB mounts Captive mount BRB | AMC Mecanocaucho
which Soundown carries and provide positive capture so no worries with movement. The Grainger isolator is not typically used because if it deteriorates the equipment may come adrift.

Use an isolator only at one end, not both. This avoids potential resonance.

I have the Soundown Carpet underlayment in my own boat and it really works with airborne noise. I doubt it would do much for vibration, but it does feel really soft underfoot.

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Old 07-15-2016, 10:37 PM   #51
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Saggy floors

Hi there, I've read with interest on jacking the floors up. I've put together some temporary jacks with the view to permanently reinforcing the floor.

It's on a 1975 Californian 42, my question being, does anyone know the correct distance from the longitudinal stringer to the bottom of the floor joist, say at the front and rear of the large floor hatches?

Just wondering if I'm off by an inch or two, or maybe even more!!!

Thanks

Andy in Alaska
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Old 07-15-2016, 11:02 PM   #52
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Dunno, but I designed my jacks with about 6-8 inches of lift that is more than enough. I marked the start point with red sharpie and have only cranked less than 2 inches. I cranked until the alignment of my cabinet doors matched.
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