Cruisers Forum
 


Join CruisersForum Today

Reply
 
Thread Tools Search this Thread Rate Thread Display Modes
Old 05-03-2018, 16:06   #1
Registered User

Join Date: Dec 2011
Boat: Blue Buoy Del Rey 50
Posts: 156
How much weight can mast support for lifting dinghy?

Our current dinghy weighs with out motor 115lbs to specs not including the Yamaha 25hp eudoro engine on it. We recently aquired a new dinghy that is around 320 to spec not including the outboard weight.

We usually pick the dinghy up and hang it off the side when anchored. We dont have davits and keep the dinghy up on the fore deck when sailing.

Just wondering if its ok for the extra weight to be hanging off the side the line goes to a block on the lower spreaders.

Thanks
__________________

deepthought is offline   Reply With Quote
Old 05-03-2018, 16:19   #2
Registered User

Join Date: Nov 2013
Location: Nice, France
Boat: Hunter Marine 38
Posts: 406
Re: How much weight can mast support for lifting dinghy?

Quote:
Originally Posted by deepthought View Post

Just wondering if its ok for the extra weight to be hanging off the side the line goes to a block on the lower spreaders.

Thanks
So the title should be "How much weight can spreaders support for lifting dinghy?"
__________________

sailormed is offline   Reply With Quote
Old 05-03-2018, 16:29   #3
registered user
 
HankOnthewater's Avatar

Join Date: Dec 2012
Location: West Australia
Boat: plastic production yacht, suitable for deep blue water ;)
Posts: 446
Re: How much weight can mast support for lifting dinghy?

Like you, I have hoisted the dinghy out of the water/alongside using the mainsail halyard or another one, although the dinghy was considerable smaller than your old and new one.

The 25Hp enduro would weigh a little over 50 kg/110 lbs, and that would add up 320+110=430 lbs or about 200 kg.
You didn't say what size/type of boat you have (catfisher 28????), but I imagine that if a yacht or cat is big enough to store such tender on deck, the halyard/sheave/mast will be strong enough to support that.
The only caveat is that the halyard tension would not be in line with the sheave and the sheave could cut into the halyard, and on a cat this misalignment would be even bigger. Regular checks for chafe might be called for.

Edit: oops didn't see the "block on lower spreaders"........ I doubt if many spreaders are designed to take such downward load, OK, not all the 200 kg would be hanging on the spreader, but..... Maybe if the intermediate shroud is terminated on that spreader with a turnbuckle?
__________________
Wishing you all sunny skies above, clear water below, gentle winds behind and a safe port ahead,
and when coming this way check http://www.cruiserswiki.org/wiki/Albany,_Australia
HankOnthewater is offline   Reply With Quote
Old 05-03-2018, 16:43   #4
Registered User

Join Date: Dec 2011
Boat: Blue Buoy Del Rey 50
Posts: 156
Re: How much weight can mast support for lifting dinghy?

The boat is 50ft monohul 22tons mast is around 62ft.

I didnt mean the block was on the spreader but that the block is connected to the mast it is just at the same level as the lower spreaders.

There is shrouds terminate directly to the mast as well at that level.
deepthought is offline   Reply With Quote
Old 06-03-2018, 08:41   #5
Registered User

Join Date: Sep 2010
Location: Boat in Greece, Beach cat in Israel
Boat: Lagoon 400 & Nacra 6.0 beach cat
Posts: 784
Re: How much weight can mast support for lifting dinghy?

Quote:
Originally Posted by deepthought View Post
The boat is 50ft monohul 22tons mast is around 62ft.

I didnt mean the block was on the spreader but that the block is connected to the mast it is just at the same level as the lower spreaders.

There is shrouds terminate directly to the mast as well at that level.
There should not be any problem with the mast.
BUT - check the connection between the block and the mast (aluminium rivets? S/S bolts?). In my eyes this is the possible failure point.
meirriba is offline   Reply With Quote
Old 06-03-2018, 09:02   #6
Registered User

Join Date: Mar 2011
Location: fl- various marinas
Boat: morgan O/I 33' sloop
Posts: 1,259
Re: How much weight can mast support for lifting dinghy?

If your boat has the space, load on the mast should be no issue. Anything big enough to carry 400# hanging off the side has a mast that can easily carry the load. The connection to the block is the vulnerable point
Dave22q is offline   Reply With Quote
Old 06-03-2018, 09:42   #7
Registered User

Join Date: Sep 2017
Location: Langley, WA
Boat: Nordic 44
Posts: 354
Re: How much weight can mast support for lifting dinghy?

The angle between the sheeve and the line can be reduced by using a masthead halyard or a spinnaker halyard rather than a lower block. The halyard and the sheeve should handle 400+ pounds fine.

My concern would be the effort needed to lift that weight. Do you have an electric winch or sufficiently sized winch available? Keep in mind that friction will add to that load.
stormalong is offline   Reply With Quote
Old 06-03-2018, 10:32   #8
Registered User

Join Date: Sep 2007
Boat: GibSea 472
Posts: 353
Re: How much weight can mast support for lifting dinghy?

Quote:
Originally Posted by deepthought View Post
The boat is 50ft monohul 22tons mast is around 62ft.

I didnt mean the block was on the spreader but that the block is connected to the mast it is just at the same level as the lower spreaders.

There is shrouds terminate directly to the mast as well at that level.
My mast is 64 ft, on my 12 tons skoop, and I lift my Carib Rib (150 pounds) easy with a masthead spinnaker halyard. So, I believe no problem for you...
Elie is offline   Reply With Quote
Old 06-03-2018, 13:04   #9
Senior Cruiser
 
philiosophy's Avatar

Cruisers Forum Supporter

Join Date: Apr 2010
Location: cruising New Caledonia
Boat: 1980 Southern Cross 39
Posts: 94
Images: 2
Re: How much weight can mast support for lifting dinghy?

I used that same method to lift my 9.9 Achillies and 8hp yamaha two stroke. I found excessive wear on the main Halyard probably from the sideways load at the Masthead block. Now I use the old block and tackle that the previous owner had for a vang. I have this hung from the same Main Halyard and am able to pull the 9.8Tohatsu and 11 Avon hard bottom. You could do this same possibly with a six part block and tackle instead of a four part and save the constant wear and tear on your Halyard. All that said sounds like your best solution is Davits unless you have a Wind Vane which I assume is the case....Cheers
philiosophy is offline   Reply With Quote
Old 06-03-2018, 14:02   #10
Registered User
 
sailaway68's Avatar

Join Date: Feb 2018
Posts: 1
Thumbs up Re: How much weight can mast support for lifting dinghy?

Quote:
Originally Posted by deepthought View Post
Our current dinghy weighs with out motor 115lbs to specs not including the Yamaha 25hp eudoro engine on it. We recently aquired a new dinghy that is around 320 to spec not including the outboard weight.

We usually pick the dinghy up and hang it off the side when anchored. We dont have davits and keep the dinghy up on the fore deck when sailing.

Just wondering if its ok for the extra weight to be hanging off the side the line goes to a block on the lower spreaders.

Thanks
There should be no problem.
sailaway68 is offline   Reply With Quote
Old 06-03-2018, 19:43   #11
Moderator
 
JPA Cate's Avatar

Join Date: Nov 2011
Location: aboard, cruising in Australia
Boat: Sayer 46' Solent rig sloop
Posts: 13,691
Re: How much weight can mast support for lifting dinghy?

deepthought: Or, you could use your spinnaker halyard, from a mast bale at the top of the mast. That's what we've used. The 12mm halyard has no problem with the weight, even with the engine on. However, our dinghy weighs less than your new one.

Ann
__________________
Who scorns the calm has forgotten the storm.
JPA Cate is offline   Reply With Quote
Old 06-03-2018, 22:57   #12
Registered User

Join Date: Feb 2015
Location: Oakland CA
Boat: Morgan 46 ketch
Posts: 524
Re: How much weight can mast support for lifting dinghy?

No worries! Your mast can easily support enough weight to pull your entire boat over on its side.

Our boat does not have a spinnaker halyard. We usually store the outboard on deck before raising the RIB, but sometimes we want to lift both to the foredeck. We raise our Honda 15 4stroke (110 lbs) + Carib RIB (must be at least 120 lbs?) using our spare jib halyard from the masthead sheave. Before lifting, I grab the RIB painter, pull the RIB toward the bow and make it fast on the bow mooring cleat. The ideal painter length is found by experiment, but this ensures that I as I raise the RIB it stays forward as much as possible so I won't be putting too much sideways strain on the halyard at the sheave. I don't notice any wear on the halyard after doing this for dozens of times in the course of a few years.

My wife helps by pushing outboard on the halyard as I crank up the RIB, keeping it from hanging up on the lifelines. Very important: just before the RIB clears the lifelines I have her move forward to the bow so she won't get run over by the RIB swinging in over the lifelines. Otherwise I might have some marital difficulties! Then since I am at the mast winch I just guide the RIB in with one hand and lower it with the other. A good reason to have your halyard winches at the mast - you can deal with any problems quickly since you are right where the action is.
waterman46 is offline   Reply With Quote
Old 07-03-2018, 17:17   #13
Registered User

Join Date: May 2006
Location: Miami
Boat: Privilege P43
Posts: 139
Re: How much weight can mast support for lifting dinghy?

I would not expect you to have a problem hoisting that load.
We used to carry a jet ski (300 kg dry) on our foredeck and regularly deployed and retrieved it using a spinnaker halyard. Wear and tear on sheave, block and line was minimal.
That being said, with a 25' beam it was not always (or ever) easy to push it outboard; however, temporarily removing lifelines helped.
__________________

emcmia is offline   Reply With Quote
Reply

Tags
dinghy, lift, mast

Thread Tools Search this Thread
Search this Thread:

Advanced Search
Display Modes Rate This Thread
Rate This Thread:

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are Off
Pingbacks are Off
Refbacks are Off


Similar Threads
Thread Thread Starter Forum Replies Last Post
Lifting Keel vs Not Lifting!!! jamescorfu Monohull Sailboats 9 30-08-2017 15:15
How much weight will mast support? dmksails Deck hardware: Rigging, Sails & Hoisting 2 24-04-2016 21:05
How Much Weight In The Bow Is Too Much? KISS Construction, Maintenance & Refit 31 22-10-2014 01:12
How Much Weight Can I Load My Freaking Boat Up With?!??!! NOMN Monohull Sailboats 32 06-06-2013 22:15
How Much Weight Is Too Much ? capngeo Auxiliary Equipment & Dinghy 5 24-09-2010 19:40



Copyright 2002- Social Knowledge, LLC All Rights Reserved.

All times are GMT -7. The time now is 07:21.


Google+
Powered by vBulletin® Version 3.8.8 Beta 1
Copyright ©2000 - 2018, vBulletin Solutions, Inc.
Social Knowledge Networks
Powered by vBulletin® Version 3.8.8 Beta 1
Copyright ©2000 - 2018, vBulletin Solutions, Inc.

ShowCase vBulletin Plugins by Drive Thru Online, Inc.