Lifting the tender from the water - will it work?

Vladis

Vladis

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Hello,

Next May we will have a new tender weighting 28 kgs. Our previous tender weighted 12 Kgs and me alone was able to pull it out of the water and place it in front of the mast of our sailing boat. So I am planning a scheme to help me in that operation. A drawing can be opened from the bottom of this web page:

https://www.vela-navega.com/index.php/tender-lifting

My main doubt is if the cross tree is strong enough to support 56 Kg (28 for the dinghy plus 28 Kg from me pulling the hoisting line). Any tips or recommendations would be most appreciated!

Regards, Luis
 
Cross trees are not designed for a vertical load, but a compression load in towards the mast.

It MIGHT be successful, but alternative methods, e.g spinnaker halyard, will take the risk away.
 
I am using halyard and a shortened spinaker pole (to keep it from the hull) with a great success. Your dinghy is actually very light, I was using it on a dinghy with electric motor and huge battery - total weight about 70 kg, but somebody pinched it a month ago and replaced it with a more conventional and lighter setup...
 
Vladis said:
Hello,

Next May we will have a new tender weighting 28 kgs. Our previous tender weighted 12 Kgs and me alone was able to pull it out of the water and place it in front of the mast of our sailing boat. So I am planning a scheme to help me in that operation. A drawing can be opened from the bottom of this web page:

https://www.vela-navega.com/index.php/tender-lifting

My main doubt is if the cross tree is strong enough to support 56 Kg (28 for the dinghy plus 28 Kg from me pulling the hoisting line). Any tips or recommendations would be most appreciated!

Regards, Luis
Click to expand...

I use a spinnaker pole on the front of my mast with the spinnaker halyard through the fwd end of the pole to lift the dingy on to my fordeck. The lifting is dome with a mast winch so very liffle heave lifting is actually needed.

My dingy is a rigid GRP just over 3 metres long and is lifted flat out of the water over the guard rails onto the deck supports.
 
sarabande said:
Cross trees are not designed for a vertical load, but a compression load in towards the mast.

It MIGHT be successful, but alternative methods, e.g spinnaker halyard, will take the risk away.
Click to expand...

Hello,

Thank you all for an immediate response to my question! I have no spinnaker and the main sail is of the furling type! The only line that could be used is the topping lift that supports the boom. So I am looking for other possibilities. With respect to the load on the cross tree, may this is a solution:

cross-tree.jpg

Regards, Luis
 
I would not use an important strut designed to work under compression, under a load that tried to flex it whilst it was under compression.
 
Rogershaw said:
I use a spinnaker pole on the front of my mast with the spinnaker halyard through the fwd end of the pole to lift the dingy on to my fordeck. The lifting is dome with a mast winch so very liffle heave lifting is actually needed.

My dingy is a rigid GRP just over 3 metres long and is lifted flat out of the water over the guard rails onto the deck supports.
Click to expand...

We lift our 64kg rib with spinnaker halyard and used to use the pole to to swing it onto the foredeck but ended up forgetting the pole as that added a few minutes to the exercise which was nearly as easy just pushing the rib away from the guardrail a until high enough. If you can't use the genoa or main halyard then the topping lift should be fine.
 
Vladis said:
Hello,

Thank you all for an immediate response to my question! I have no spinnaker and the main sail is of the furling type! The only line that could be used is the topping lift that supports the boom. So I am looking for other possibilities. With respect to the load on the cross tree, may this is a solution:

View attachment 69526

Regards, Luis
Click to expand...

As your rigging is jointed at the spreaders, the weight of the tender will not pull the spreader end down. But you will still be pulling the spreader out of line, I would be cautious about that. Why not take the hoist to the mast end of the spreader?
Personally, I find some rollers on the guardwire, intended to help the genoa over, help with the tender.
Pulling down 28kgf on a rope is not trivial. Probably harder than lifting it.
I am strong enough to just heave the tender aboard, but I've seen people doing similar to what you propose, using the kite halyard. You don't need to lift the whole tender on the halyard, just the transom.. Then handle the bow manually.
 
lw395 said:
As your rigging is jointed at the spreaders, the weight of the tender will not pull the spreader end down. But you will still be pulling the spreader out of line, I would be cautious about that. Why not take the hoist to the mast end of the spreader?
Personally, I find some rollers on the guardwire, intended to help the genoa over, help with the tender.
Pulling down 28kgf on a rope is not trivial. Probably harder than lifting it.
I am strong enough to just heave the tender aboard, but I've seen people doing similar to what you propose, using the kite halyard. You don't need to lift the whole tender on the halyard, just the transom.. Then handle the bow manually.
Click to expand...

Mebby a problem, mebby not, but as lw395 says you wont be pulling down on the spreader, you will be releasing 56kg from the stay (and thats naff all compare to what is in it already)
Just for interest, you will be putting a bit more than double the weight of the tender on the hoist due to friction, acceleration (other wise it just sits there) and the pull not being directly in line of the weight.
 
Vladis said:
Hello,

Thank you all for an immediate response to my question! I have no spinnaker and the main sail is of the furling type! The only line that could be used is the topping lift that supports the boom. So I am looking for other possibilities. With respect to the load on the cross tree, may this is a solution:

View attachment 69526

Regards, Luis
Click to expand...

Good time to fit a spare halyard using the spinnaker sheave. That will already be there and a slot for the exit, so just get a rigger to go up the mast and drop a halyard through. This will do much better than rigging a hoist from the spreaders as it will bring the dinghy closer to where you want to stow it. However a 28kg is no problem to lift manually over the guard rail. You have a big enough boat and space on the side and foredeck to handle it.
 
Tranona said:
However a 28kg is no problem to lift manually over the guard rail. You have a big enough boat and space on the side and foredeck to handle it.
Click to expand...

I have to agree. A 28kg tender isn't especially heavy and should be easily handled by most people. It's about the same weight as my Zodiac Cadet Aero, which I'm quite happy to lift.
 
pvb said:
I have to agree. A 28kg tender isn't especially heavy and should be easily handled by most people. It's about the same weight as my Zodiac Cadet Aero, which I'm quite happy to lift.
Click to expand...

They can be awkward on a foredeck though, it's not like lifting a 28kg bag of spuds.
 
lw395 said:
They can be awkward on a foredeck though, it's not like lifting a 28kg bag of spuds.
Click to expand...

The OP has a 40' Beneteau. More than enough room to handle it. Never had any problem with my slightly smaller 37' Bav. Pull it up over the guardrail until it gets to the pivot point then drop it onto the deck. Easier though with a halyard as you can lift it well above the guard rail and then lower it into your chosen position.
 
jiris said:
I am using halyard and a shortened spinaker pole (to keep it from the hull) with a great success. Your dinghy is actually very light, I was using it on a dinghy with electric motor and huge battery - total weight about 70 kg, but somebody pinched it a month ago and replaced it with a more conventional and lighter setup...
Click to expand...
:)
Well that was damn decent of them. Not often one finds such considerate thieves
 
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Quote Originally Posted by jiris
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View Post
I am using halyard and a shortened spinaker pole (to keep it from the hull) with a great success. Your dinghy is actually very light, I was using it on a dinghy with electric motor and huge battery - total weight about 70 kg, but somebody pinched it a month ago and replaced it with a more conventional and lighter setup...
image: http://www.ybw.com/forums/images/smilies/smile.png


Well that was damn decent of them. Not often one finds such considerate thieves
Read more at http://www.ybw.com/forums/showthrea...-water-will-it-work/page2#KDTuVXzWfesAstl1.99

:D:D:D Interesting how one leaving out little letter like "I" can change the whole meaning. Thanks for noticing!
 
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