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Old 03-14-2019, 07:54 AM   #1
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David crane

Does anyone have a gouge on how to figure how much weight a deck crane can handle? I have a Hyatt Fantail 50 and there is not a lot of data available on this model since only 11 were imported to the US and that was twenty years ago.
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Old 03-14-2019, 08:03 AM   #2
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Do you have a name plate or photo of the davit ?
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Old 03-14-2019, 10:16 AM   #3
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Old 03-14-2019, 10:54 AM   #4
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I'm going to guess he meant "Davit Crane"?..... and is looking for a gauge on the working and max limits of the crane.

The make and model of the crane would be needed to answer that question.
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Old 03-14-2019, 01:13 PM   #5
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Installation would probably matter, too. A crane with its foot on deck would likely be much less capable than one with an extension down into the main level or even into the bilge.

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Old 03-14-2019, 01:29 PM   #6
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Quote:
Originally Posted by Shrew View Post
I'm going to guess he meant "Davit Crane"?..... and is looking for a gauge on the working and max limits of the crane.

The make and model of the crane would be needed to answer that question.
Davit
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Old 03-14-2019, 01:58 PM   #7
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Make model specs needed then likely engineer would have to calc after he or she inspects. Assuming this was not a factory install. If it was fsctory then mfrs rating ought to be on file somewhere.
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Old 03-14-2019, 03:43 PM   #8
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Or maybe David knows!
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Old 03-14-2019, 04:53 PM   #9
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Or maybe David knows!
Okay, let's give this guy a pass.
I am hard of hearing and sometimes ....
Could also be another of the "spellcheck" errors.

But it is so much fun to tease him. LOL
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Old 03-14-2019, 04:55 PM   #10
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I looked at three different Fantail 50’s on YW, and none of the listings provide any specs on the davits.
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Old 03-15-2019, 02:32 PM   #11
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I also looked at the three boats on Yachtworld and enlarged this photograph of the only unit clearly visible. The unit in the photo looks very close in size and design to another one I have for sale, rated by the builder at 600 lbs.. My unit is of 3.5” aluminum construction and is designed to use a 2.5” solid bar aluminum standpipe. If the one you are asking about is the same as in the photo, it could also be of stainless steel construction instead of aluminum, making it stronger still. Nick Jackson also makes a similar pipe style crane.
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Old 03-15-2019, 04:09 PM   #12
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If your standpipe is only 2” in diameter and is solid, then it has a fairly low rating. My 6’ MarQuipt rated at 1500lbs had a 4.5” diameter pipe and a 1” wall thickness. The replacement 10’ unit with the same rating uses a 5” pipe with a 2” wall thickness.
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Old 03-15-2019, 05:03 PM   #13
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Here is a spec’ chart for Nick Jackson aluminum pipe davits that may help for some comparison. Column to the far left is capacity in pounds. Be aware that the 300 and 500 models do not have backbone reinforcements.
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Old 03-16-2019, 04:27 PM   #14
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Here is a spec’ chart for Nick Jackson aluminum pipe davits that may help for some comparison. Column to the far left is capacity in pounds. Be aware that the 300 and 500 models do not have backbone reinforcements.


Yes, I was asking about the crane (I challenge you to enter d a v i t and not have the site spell correct you)
It is a pipe design, apparently steel since it shows a little rust, 4” diameter going thru the top deck and into the main deck, with the added backbone rail also in steel. The winch is rated at 2000 lbs and it has 5/32 stainless cable. I’m sort of thinking that they would not have installed a 2000 lb winch on a mast that could not support something close to that. Unfortunately, I don’t think the original builder specs are available. I need a 700 lb working load for the new tender. Guess we’ll find out one way or another.
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Old 03-18-2019, 02:23 PM   #15
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Davit crane

Quote:
Originally Posted by healhustler View Post
I also looked at the three boats on Yachtworld and enlarged this photograph of the only unit clearly visible. The unit in the photo looks very close in size and design to another one I have for sale, rated by the builder at 600 lbs.. My unit is of 3.5” aluminum construction and is designed to use a 2.5” solid bar aluminum standpipe. If the one you are asking about is the same as in the photo, it could also be of stainless steel construction instead of aluminum, making it stronger still. Nick Jackson also makes a similar pipe style crane.
Thanks, very useful. Your photo is actually of a sister ship to mine. We have a beefier crane-3 1/2 diameter steel with exoskeleton at curve. I’m hoping to raise and lower a 650 lb RIB. Thinking I’ll use a pulley block, at least initially, to spread the load and not stress the winch motor as much..
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