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Go Back   SailNet Community > On Board > Gear & Maintenance > Anyone have their davits set up for one person to use?
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Thread: Anyone have their davits set up for one person to use? Reply to Thread
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Topic Review (Newest First)
11-01-2012 12:24 PM
chef2sail
Re: Anyone have their davits set up for one person to use?

It is an advantage to have the capabilty to have the lines seperated when lifting or lowering so you can put a slight angle to let any excess water go out the drain hole before placeing the plug in. The main thing here is the proper purchase. Ours is 6:1 so lifting 140 lbs is fairly easy.

Dave
11-01-2012 12:17 PM
svHyLyte
Re: Anyone have their davits set up for one person to use?

One can implement a single line lift by using a spreader bar slightly longer than the distance between lift points on the boat at the level of the boat. The slings attached to the boat are connected to the spreader bar fore'n aft at the lift points. A (multi-part) lift line is attached to the motor end of the boat with the line led over a block at the davit and back to the block at the spreader bar, then along the length of the spreader to a single block at the forward end of the boat above the forward slings, around that 90ļ and up to a single block at the second davit and from there, through lead blocks, through a cam-cleat and to a convenient winch or horned cleat. Assuming one has to lift a combined weight (motor and boat) of 200#, a 5:1 tackle at the aft davit would require only 40# of tension in the lift line. Because of the spreader bar, both ends of the boat must raise at the same rate. If the foregoing is unclear, I can make a sketch but it's really not complicated.

FWIW...
11-01-2012 11:22 AM
redline
Re: Anyone have their davits set up for one person to use?

Quote:
Originally Posted by pdqaltair View Post
Lowering. Easy, just stand in the middle and hold both lines.

Raising. Side to side. Really, it would be a lot of weight to do at once, which would mean more tackle and more friction, or winches.... and not easier. Because the blocks swivel and have cam cleats, I don't have to walk side to side, only pull right, pull left, pull right.... And there's no harm in lefting a few feet at a time.

As everyone has suggested, a 6:1 tackle and cam cleats is the way to go. So easy my girl could manage it when she was 13.

Sail Delmarva: Better Purchase for Dingy Davits
Thanks for the mention of checking the Harken site for the 90-degree reeving of the 6:1 tackle. I upgraded from 4:1 to 6:1 when I change to a 15Hp outboard on our 3.1m RIB, and however I rigged it (same as all the other boats I saw with triple blocks), there was always a high-friction crossover.

One caveat: the Harken drawing looks wrong on the webpage,

Harken Reeving Diagrams

(the line on the becket crosses in front two others), but clicking "print version"

http://www.harken.com/pdf/6-1_reeving-diagram.pdf

gives a much clearer and correct view.

Oh, and I also hoist from the center, alternating sides. I can start pulling both lines together, but once the aft end is out of water, no way.
10-24-2012 08:30 PM
beachbm61
Re: Anyone have their davits set up for one person to use?

I'm always the one raising the dinghy by myself. I've got a 4:1 purchase. Should have gone with 6:1 so the lady could do it by herself.. I normally pull both lines at the same time. Our dink is a light Mercury RIB with a small 2 stroke 6hp Merc.
09-26-2012 01:28 PM
Minnewaska
Re: Anyone have their davits set up for one person to use?

Yes, cam cleats here as well as two horns on the top of the davit.
09-26-2012 10:01 AM
pdqaltair
Re: Anyone have their davits set up for one person to use?

Lowering. Easy, just stand in the middle and hold both lines.

Raising. Side to side. Really, it would be a lot of weight to do at once, which would mean more tackle and more friction, or winches.... and not easier. Because the blocks swivel and have cam cleats, I don't have to walk side to side, only pull right, pull left, pull right.... And there's no harm in lefting a few feet at a time.

As everyone has suggested, a 6:1 tackle and cam cleats is the way to go. So easy my girl could manage it when she was 13.

Sail Delmarva: Better Purchase for Dingy Davits
09-26-2012 09:31 AM
chucklesR
Re: Anyone have their davits set up for one person to use?

I do the side to side dance -

The only way I could see doing away with the dance is to put a turning block on the davits and another amid ships, they would need guide blocks/eyes as well.

By the time you get done doing that you'd have so much induced friction you'd likely need a winch as well - and the lines would have to be of equal length (not likely).

You could rig a four point hoist onto the dinghy and connect to a single lift line (like some trawlers do), but you better eat your wheaties because that's going to be a heck of a pull to get a dinghy up (e.g., my 115 pound RIB and it's 50 pound motor).
09-26-2012 08:54 AM
Maine Sail
Re: Anyone have their davits set up for one person to use?

It's always a one person job for me but we have cam cleats for the davit lines... Going up I do port then stbd then port then stbd. Going down I can hold and deploy both port and stbd lines at the same time...
09-26-2012 08:36 AM
PorFin
Re: Anyone have their davits set up for one person to use?

It's usually a one-person job here as well (and you know who is that one person...)

Cam cleats make all the difference.
09-26-2012 06:45 AM
Minnewaska
Re: Anyone have their davits set up for one person to use?

I swap side to side as well. Three stages on each side. For the end of the dinghy with the motor, I bring the line back to the primary winch on that side. I can pull up the bow by hand.
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