Rigging on davits

[Pack Mule]

If you go with an electric lift, anchor point for and aft, lifting from the center balance point, you can avoid the blocks.
Again, look around the marina and see how some other folks handle this. Ideas and advice are free.
Just how big is your outboard?

This is the outboard . I believe I’m the only one in the marina with a dinghy . Mostly houseboat dock queens. Here is the motor 2.5 hp Lehr

 

[OldDan1943]

This is the outboard . I believe I’m the only one in the marina with a dinghy . Mostly houseboat dock queens. Here is the motor 2.5 hp Lehr

A 2.5 hp weighs very little. A direct lift is within reason.
The boat weighs far more than the engine.
You must figure out a way to secure the boat when in the "travel position", taking the weight off the lifting mechanism.

 

[Pack Mule]

A 2.5 hp weighs very little. A direct lift is within reason.
The boat weighs far more than the engine.
You must figure out a way to secure the boat when in the "travel position", taking the weight off the lifting mechanism.

The davits have cleats welded on each side for securing the load.

 

[healhustler]

Marty: My Admiral couldn’t pull the strings for our dinghy davits either, but I didn’t want electric. I finally ended up with twin 900 lb. single speed hand crank trailer winches, using Amsteel grey 5400 lb. single line. Now lifting the dinghy is easy peasy, even with outboard and me in it. The winch bases are drilled for twin 1.5” stainless U-bolts each to grip the bottom davit tube, and both now have sailboat type line locks just in case. Being an old rigger, it took me quite a while to trust single line strength, but eventually I learned, and now I also have the same winch and single line on our rotating dinghy crane for MOB recoveries as well.

 

[psneeld]

Larry, if you don't mind, where did you get the winches?

 

[OldDan1943]

The davits have cleats welded on each side for securing the load.

Using lines that do not stretch?

 

[FF]

A winch for each line is fine , with only one winch and cleats you may need to hold the entire weight of the dink, to free the winch.

Simplest is a sailboat set of main sheet blocks that cleat the line automatically.

Crap plastic look , but very functional.

 

[Pack Mule]

Using lines that do not stretch?

I’m sure the line stretches some. 7/16 “ Genoa sheet line.

 

[Pack Mule]

A winch for each line is fine , with only one winch and cleats you may need to hold the entire weight of the dink, to free the winch.

Simplest is a sailboat set of main sheet blocks that cleat the line automatically.

Crap plastic look , but very functional.

FF I love the old wood blocks I got from you but we need more power for lifting.

 

[cafesport]

Try a set of fiddle blocks from a sailboat main sheet or boom Vang. If they don’t work better, you can always use them to lift heavy loads around the boat somewhere. Here is a picture of a set I used to lift a generator into my boat last June.

 

[HiDHo]

Marty, I know you don’t want this word of wisdom but I think your davits would be better off without the center bar and sockets for the davit bases to swivel in. Then the davits blocks would line up vertically and could be swong inboard after the dinghy was launched. With this setup you stabilize side to side swing with a centered strap around the dinghy. Just a thought.

 

[DDW]

It’s been 20 years since I had to buy blocks. But definitely Don’t get ones with delrin or nylon bearings. Stainless or bronze bearing/bushing only.

If you do go 6:1, friction in the blocks begins to offset the mechanical advantage of the tackle. You really need free running blocks. These will have a PTFE/Nomex bearing for heavy loads, but for this light load you want ball or roller bearing blocks (no one is using bronze bushings anymore). They will run with significantly less friction at light loads. The Schaefer you have pictured are suboptimal for this application. I'd look at Harken Classic as a minimum, the Harken Air or Black Magic as upgrades.

Another thing to consider it to use a ratchet block in each tackle. These allow the line to run freely coming in, but provide some friction letting out against the load. It lets you relax a bit going either direction.

 

[Pack Mule]

The davits are working fine .I took all the swivels off a while back . My problem now is I need more purchase power so it’s not so tough to lift . I might should start another thread about lifting power. Here is my set up now. It works fine but it’s a struggle with current purchase power . I only have a 2 to 1 and basically a 1 to 1 unless I’m looking at wrong .

 

[Pack Mule]

Marty, I know you don’t want this word of wisdom but I think your davits would be better off without the center bar and sockets for the davit bases to swivel in. Then the davits blocks would line up vertically and could be swong inboard after the dinghy was launched. With this setup you stabilize side to side swing with a centered strap around the dinghy. Just a thought.

I see what you saying Bill . That’s what my neighbor has.

 

[Xsbank]

Rode, never “rhode.”

 

[Pack Mule]

Rode, never “rhode.”

Yea I guess I’ve beat this dead horse enough .

 

[healhustler]

Larry, if you don't mind, where did you get the winches?

Scott: Winches were bought at Worst Marine on Sale for $75. I don’t see the 900 Lb. rating on the enclosed model anymore, but here’s the same winch rated at 1600 for $72.

https://www.etrailer.com/Trailer-Wi...MI0taO86z73wIV1bfACh0JOAa9EAQYCiABEgIHZfD_BwE

 

[koliver]

Ok this is driving me crazy . Why are these blocks twisting 90 degrees to each other ? I have swivels on each end . Do I need to remove one ? On the side that has the double block at the top the line wants to climb out of the sheave .

Twist in the line will cause twist of the blocks. You need to untwist the line before you start to hoist.

No winches? No wonder you are having trouble with a 200# load. You need to get a pair of self tailing sailboat winches. They don't need to be huge. Used sheet winches from a 20' sailboat would do.

Mt setup with a pair of self tailing winches is adequate to lift my 750# Caribe 12 complete with built in fuel tank (full) and 40 Honda. I use a 6 part on the stern and 4 part on the bow.

I see you have pictures of your neighbour's boat trailer winches. Those should never be allowed on a boat. Only on land.

 

[psneeld]

Scott: Winches were bought at Worst Marine on Sale for $75. I don’t see the 900 Lb. rating on the enclosed model anymore, but here’s the same winch rated at 1600 for $72.

https://www.etrailer.com/Trailer-Wi...MI0taO86z73wIV1bfACh0JOAa9EAQYCiABEgIHZfD_BwE

Thanks!

 

[HiDHo]

Marty, these are the blocks I used on our 1987 Monk36 davits if you don’t want power. The dinghy was a 8’ Nutshell pram rigged to sail.

 

[Pack Mule]

Marty, these are the blocks I used on our 1987 Monk36 davits if you don’t want power. The dinghy was a 8’ Nutshell pram rigged to sail.

Thanks Bill , I’m looking at Harken blocks right now. I drew these davits up for the welder and I’m kinda stuck with them and they’re hard mounted on the transom with sst backing plates. I wish now I would’ve put the dinghy on the roof and used a crane with a motor. I’m thinking about the 57 mm Harken blocks.

 

[HiDHo]

Marty, I designed the Monk’s davits also but I had the welder put s/s sockets on the transom brackets. The sockets had retaining pins so I could pull the pins and rotate the davits or remove them. I liked that I could easily raise the dinghy at night anchorage, felt more secure to me.

 

[Comodave]

What about just mounting a brake winch on each davit arm? They will allow line to pay out by cranking in one direction on the winch and retrieve by going the other way. The load will stop whenever you stop cranking and will stay put. You don’t want a pulling winch like on a boat trailer. With a brake winch you do need a minimum load in order for the cable to pay out but you can keep a small padded weight for that purpose. Then you can easily crank in or out to raise or lower the dinghy. You would need to fabricate a mounting pad for the winches to bolt to the davit arms. Do a search on brake winches and see what you think. A friend of mine used one to raise and lower his dinghy using the boom on his mast. It worked great. It is nice if you need to take a brake while going up or down that the dinghy will just stop in place and wait for you to resume.

 

[Pack Mule]

Ok I just got these in today from Garhauer Marine. They were nice people to deal with and they actually answered their phone and returned calls. They have 10% sale going on also. These are 6 to 1 purchase, one for starboard and one for port. They both have camcleats that are mounted inline with the outboard sheaves so the lines won’t cross each other. The top set of blocks do not swivel but bottom set does. This is the setup they use with their standard davits.
Hopefully we can hoist the dinghy without me having to take a couple nitroglycerin pills. I’m also hoping we can hoist it up with our new 2hp Lehr outboard mounted.

 

[healhustler]

Nice hardware, Marty. Please post the finished product. 6 to 1 does make for a lot of rope though.

 

[Pack Mule]

Nice hardware, Marty. Please post the finished product. 6 to 1 does make for a lot of rope though.

Yes it does. I just couldn’t figure out a good place to mount winches. I hope this works, we’ve been struggling with this since day one.

 

[FF]

Mount a cam cleat , so as you lift the dink the line will not fight between pulls.

 

[Pack Mule]

I’m happy to report that this worked. I still need to add another shackle to get the rigging turned 90 degrees but it works great, hoisting takes very little effort now..

 

[FF]

Looks like if you removed the top shackle the block would hook directly to the davit, and allow the 90 deg turn??


KISS!

 

[Pack Mule]

Looks like if you removed the top shackle the block would hook directly to the davit, and allow the 90 deg turn??


KISS!

Yes I could do that but my attachment point on my davit is a little thin and the new rigging has a fairly small diameter pin there . I was afraid my thin plate would cut into that small diameter pin pretty quick . Maybe just overthinking it but the shackle has a larger diameter pin .