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Go Back   SailNet Community > On Board > Gear & Maintenance > Dinghy davit help
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Thread: Dinghy davit help Reply to Thread
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Topic Review (Newest First)
08-17-2014 01:59 PM
suncat33770
Re: Dinghy davit help by pdq?

Hi PDQ,

It has been several years this thread. I saw your blog on PDQ about the blocks.
Now several years later would you change any thing??

I am getting old It is time to replace my old davit blocks.

Randy in FL
suncat33770@yahoo.com
11-30-2012 06:57 PM
Already There
Re: Dinghy davit help

Thanks to all for your inputs, I really appreciate it. My boat has been in "restoration' status for the last few years with standing/running rigging, paint, port lights, repower, canvas, sails, interior, etc. Finally able to enjoy her a little more. The dinghy, as you all know, makes the exploration aspect of the jouney much more fun. I have a split mizzen aft stay connected through a 2:1 block to the top of each davit so weight of the dinghy will be countered a bit. Bought the davits second hand and never had a chance to research the lifting system until now. Your help has been awesome. I think I will go with the 6:1 purchase blocks for ease of operation. I have realized over the last few years that I don't quite have the orangutan strength my wife says I once had!!!
11-30-2012 04:05 PM
Stumble
Re: Dinghy davit help

I may be, but to make it easy I would still install at least a 4:1. Adding the 40lb motor really changes the math.
11-30-2012 03:26 PM
chef2sail
Re: Dinghy davit help

And probably younger and stronger than me.
11-30-2012 03:15 PM
pdqaltair
Re: Dinghy davit help

I figured you might just be a lot stronger than me. Very plausible!
11-30-2012 02:00 PM
Stumble
Re: Dinghy davit help

I would like to appologize, I completely missed the OP referencing the 40lb outboard on the dinghy. Certainly as weight goes up purchase goes up until you find an amount of purchase that is comfortable for you.
11-30-2012 10:55 AM
pdqaltair
Re: Dinghy davit help

6:1. The guy suggesting 2:1 certainly has titanium guns and no arthritis in his fingers. He also made a calculation error. With a 40# outboard hanging over the end (think leverage), a bit of water, and perhaps a PFD and some oars (yup, stuff gets left in there sometimes), the load on the aft end is closer to 100#. Use small line (gloves) and ball bearing blocks to minimize friction. I supose you could go lighter in the bow, but why bother.

This is what I did (up-grade from the original 3:1) and I love it, wouldn't do anything different. Basically a dingy mainsheet system (there are horn cleats to lock it off at the foot of the davits; the cam cleats REALLY help by providing a rest and allow you to work one end at a time)
Sail Delmarva: Better Purchase for Dingy Davits
Remember to look up the lacing pattern for 6:1 blocks; it is not obvious and doing it wrong leads to high friction. Note in the picture they are rotated 90 degrees from each other, which is essential.

Also, remember to trice-up. You may need some eyes and cleats for that.
Sail Delmarva: All Triced-Up
11-30-2012 09:39 AM
chucklesR
Re: Dinghy davit help

I agree 6:1 - make life easy.
My RIB weighs 115 pounds, the engine adds 55 and the crap in the dinghy adds another 15 or so.

Then again, if you are raising the dinghy yourself going from side to side you are NOT only pulling up 1/2 the weight. It doesn't work like that as it's not balanced in the middle. I can pull it up hand over hand, but the wife can't.
For a extra 20 bucks per block and bit more rope keep life easy, your back will appreciate it, and so will your spouse.
11-30-2012 06:17 AM
chef2sail
Re: Dinghy davit help

Quote:
It might just be me, but I think 6:1 is way more purchase than you need for a dinghy this size, and it adds more friction than advantage. If you assume each davit carries 1/2 the weight, and the boat weight 70lbs, each davit is only carrying 35lbs or so. For this I think a 2:1 is more than acceptable
Do you have davits? If you do I dont think you would be happy with 2:1.

Dont make this anymore difficult than it has to be. It doesnt add more friction, it makes it a greater advatage.

The weight wont be evenky distributed as the engine is one the rear of the dinghy. So right there thats 75lbs on the rear, one one davit arm. Add 8.5 lbs times the number of gallons either in the integral engine tank or external tank. The dinghy is usually not dry or empty so add for water in it and any stuff like oars, vests etc. Lastly there are are times you want to tillt it down to drain water so more weight will be on on the engine end. In addition sopme day you may ewant to increase the size of the dinghy ( weight) or/ and engine ( weight) again. If you are pulling the dinghy up by yourself, usually you pull on one line at a time so the weight is borne by one line.

A lot of the of the better systems use 4:1 with an upgrade option to 6:1. You proabably can get by with 4:1 but why strain Your choice.

Dave
11-30-2012 01:54 AM
Stumble
Re: Dinghy davit help

It might just be me, but I think 6:1 is way more purchase than you need for a dinghy this size, and it adds more friction than advantage. If you assume each davit carries 1/2 the weight, and the boat weight 70lbs, each davit is only carrying 35lbs or so. For this I think a 2:1 is more than acceptable.
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