Reply
 
Thread Tools Search this Thread Display Modes
 
Old 01-18-2019, 10:49 AM   #21
Guru
 
psneeld's Avatar
 
City: Ft Pierce
Vessel Name: Freedom
Vessel Model: Albin 40
Join Date: Oct 2011
Posts: 22,728
Quote:
Originally Posted by Pack Mule View Post
Hmm I have a small sailboat winch , itís not self tailing and Iím not sure I could mount it without doing some welding on the davits. Do you think the one winch would be enough? Would it just need two blocks?
in the middle with the two leads in different directions will work coming up...but a non electric power both ways might not work.


if the lift isn't too high, then one side at a time might work....winch mounted in the middle.....no necessarily welded.
__________________
Advertisement

psneeld is offline   Reply With Quote
Old 01-18-2019, 10:49 AM   #22
Senior Member
 
Ex Sailor's Avatar
 
City: Toronto
Join Date: Nov 2015
Posts: 271
Quote:
Originally Posted by Pack Mule View Post
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 .



I would take out the swivels and shackles and just bolt ( not too tight but tight enough ) the blocks to the Davits.



My .02 CAD
__________________

Ex Sailor is offline   Reply With Quote
Old 01-18-2019, 10:58 AM   #23
TF Site Team
 
Pack Mule's Avatar
 
City: Paris,TN
Vessel Name: William
Vessel Model: Outer reef 32
Join Date: Jan 2013
Posts: 3,642
Quote:
Originally Posted by Ex Sailor View Post
I would take out the swivels and shackles and just bolt ( not too tight but tight enough ) the blocks to the Davits.



My .02 CAD
I’ve removed all the swivels and replace the lines with new. It works much better now but still too much of a lift for my wife and I . Looking to lighten the load now.
__________________
Marty
Pack Mule is offline   Reply With Quote
Old 01-18-2019, 07:35 PM   #24
TF Site Team
 
Pack Mule's Avatar
 
City: Paris,TN
Vessel Name: William
Vessel Model: Outer reef 32
Join Date: Jan 2013
Posts: 3,642
These are the blocks Iím looking at for each side. Over kill or about right ? Dinghy weight is about 200 lbs with motor.
Attached Thumbnails
AB829C35-C11D-4C90-8AD4-15073D92A99E.jpg   F83200DC-0B6D-4F0E-9E12-F0F70E95E22A.jpg  
Pack Mule is offline   Reply With Quote
Old 01-18-2019, 07:40 PM   #25
Guru
 
cappy208's Avatar
 
City: Cape Cod
Vessel Name: Slip Aweigh
Vessel Model: Prairie 29
Join Date: Oct 2013
Posts: 1,214
Rigging on davits

In an earlier post I mentioned the way to reeve the blocks so they donít twist under both load and no load. It works. But you MUST reeve them correctly.

https://www.harken.com/content.aspx?id=3901

The rule of thumb for blocks is: The larger the sheave diameter is proportional to the lessened friction. And the better quality blocks with better bearings. Sorry. Canít help with which is quality and which is not.

Itís been 20 years since I had to buy blocks. But definitely Donít get ones with delrin or nylon bearings. Stainless or bronze bearing/bushing only.
cappy208 is offline   Reply With Quote
Old 01-18-2019, 08:01 PM   #26
Guru
 
OldDan1943's Avatar
 
City: Aventura FL
Vessel Name: Kinja
Vessel Model: American Tug 34 #116
Join Date: Oct 2017
Posts: 6,741
Dont forget to determine, if the blocks will permit raising the small boat properly to its "up" position.
Also, a 6 to 1 block system will take a whole more line than a 4 to 1. You will be using only 2 blocks lifting the boat from the center point???

May I encourage you to look around at existing davit systems.... you may get some better ideas incorporating an electric winch. No need to work up a sweat putting the boat into the water and taking it out of the water.
__________________
The meek will inherit the earth but, the brave will inherit the seas.
OldDan1943 is offline   Reply With Quote
Old 01-18-2019, 08:28 PM   #27
Guru
 
cappy208's Avatar
 
City: Cape Cod
Vessel Name: Slip Aweigh
Vessel Model: Prairie 29
Join Date: Oct 2013
Posts: 1,214
Consider weaver davits and only lifting the outboard side. But this only works on swim platform. And as Dan says: You could probably get away with 4 to 1 on the bow, and 6 to 1 on the outboard end. The weight is not exactly divided in half. Itís more like 1/3, 2/3.
cappy208 is offline   Reply With Quote
Old 01-18-2019, 08:49 PM   #28
TF Site Team
 
Pack Mule's Avatar
 
City: Paris,TN
Vessel Name: William
Vessel Model: Outer reef 32
Join Date: Jan 2013
Posts: 3,642
Quote:
Originally Posted by cappy208 View Post
Consider weaver davits and only lifting the outboard side. But this only works on swim platform. And as Dan says: You could probably get away with 4 to 1 on the bow, and 6 to 1 on the outboard end. The weight is not exactly divided in half. Itís more like 1/3, 2/3.
We don’t have a swim platform . What we have is working ok and even better since I removed all the swivels. I like the set up I just want to make sure that adding more sheaves is worth the bang for the buck.
__________________
Marty
Pack Mule is offline   Reply With Quote
Old 01-18-2019, 08:52 PM   #29
Guru
 
OldDan1943's Avatar
 
City: Aventura FL
Vessel Name: Kinja
Vessel Model: American Tug 34 #116
Join Date: Oct 2017
Posts: 6,741
Quote:
Originally Posted by cappy208 View Post
Consider weaver davits and only lifting the outboard side. But this only works on swim platform. And as Dan says: You could probably get away with 4 to 1 on the bow, and 6 to 1 on the outboard end. The weight is not exactly divided in half. It’s more like 1/3, 2/3.
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?
__________________
The meek will inherit the earth but, the brave will inherit the seas.
OldDan1943 is offline   Reply With Quote
Old 01-18-2019, 09:09 PM   #30
Guru
 
cappy208's Avatar
 
City: Cape Cod
Vessel Name: Slip Aweigh
Vessel Model: Prairie 29
Join Date: Oct 2013
Posts: 1,214
Quote:
Originally Posted by Pack Mule View Post
We donít have a swim platform . What we have is working ok and even better since I removed all the swivels. I like the set up I just want to make sure that adding more sheaves is worth the bang for the buck.


Just buy one set. Use it on the stern end. The stern end is heavier. (Much more so with the outboard).
cappy208 is offline   Reply With Quote
Old 01-18-2019, 09:17 PM   #31
TF Site Team
 
Pack Mule's Avatar
 
City: Paris,TN
Vessel Name: William
Vessel Model: Outer reef 32
Join Date: Jan 2013
Posts: 3,642
Quote:
Originally Posted by OldDan1943 View Post
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 Iím the only one in the marina with a dinghy . Mostly houseboat dock queens. Here is the motor 2.5 hp Lehr
Attached Thumbnails
4F48489F-7201-442F-B437-C8FF27FC2396.jpg  
Pack Mule is offline   Reply With Quote
Old 01-18-2019, 09:32 PM   #32
Guru
 
OldDan1943's Avatar
 
City: Aventura FL
Vessel Name: Kinja
Vessel Model: American Tug 34 #116
Join Date: Oct 2017
Posts: 6,741
Quote:
Originally Posted by Pack Mule View Post
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.
__________________
The meek will inherit the earth but, the brave will inherit the seas.
OldDan1943 is offline   Reply With Quote
Old 01-18-2019, 10:10 PM   #33
TF Site Team
 
Pack Mule's Avatar
 
City: Paris,TN
Vessel Name: William
Vessel Model: Outer reef 32
Join Date: Jan 2013
Posts: 3,642
Quote:
Originally Posted by OldDan1943 View Post
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.
__________________
Marty
Pack Mule is offline   Reply With Quote
Old 01-18-2019, 11:01 PM   #34
Guru
 
healhustler's Avatar
 
City: Longboat Key, FL
Vessel Name: Bucky
Vessel Model: Krogen Manatee 36 North Sea
Join Date: Oct 2009
Posts: 5,028
Marty: My Admiral couldnít pull the strings for our dinghy davits either, but I didnít 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 1.5Ē 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.
Attached Thumbnails
E2C3AF6C-4FED-4D4A-A02B-1AA59A84F89E.jpg  
__________________
Larry

"When life gets hard, eat marshmallowsĒ.
healhustler is offline   Reply With Quote
Old 01-19-2019, 06:56 AM   #35
Guru
 
psneeld's Avatar
 
City: Ft Pierce
Vessel Name: Freedom
Vessel Model: Albin 40
Join Date: Oct 2011
Posts: 22,728
Larry, if you don't mind, where did you get the winches?
psneeld is offline   Reply With Quote
Old 01-19-2019, 07:12 AM   #36
Guru
 
OldDan1943's Avatar
 
City: Aventura FL
Vessel Name: Kinja
Vessel Model: American Tug 34 #116
Join Date: Oct 2017
Posts: 6,741
Quote:
Originally Posted by Pack Mule View Post
The davits have cleats welded on each side for securing the load.
Using lines that do not stretch?
__________________
The meek will inherit the earth but, the brave will inherit the seas.
OldDan1943 is offline   Reply With Quote
Old 01-19-2019, 07:16 AM   #37
FF
Guru
 
FF's Avatar
 
Join Date: Oct 2007
Posts: 21,349
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 is offline   Reply With Quote
Old 01-19-2019, 07:36 AM   #38
TF Site Team
 
Pack Mule's Avatar
 
City: Paris,TN
Vessel Name: William
Vessel Model: Outer reef 32
Join Date: Jan 2013
Posts: 3,642
Quote:
Originally Posted by OldDan1943 View Post
Using lines that do not stretch?
I’m sure the line stretches some. 7/16 “ Genoa sheet line.
__________________
Marty
Pack Mule is offline   Reply With Quote
Old 01-19-2019, 07:39 AM   #39
TF Site Team
 
Pack Mule's Avatar
 
City: Paris,TN
Vessel Name: William
Vessel Model: Outer reef 32
Join Date: Jan 2013
Posts: 3,642
Quote:
Originally Posted by FF View Post
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.
__________________
Marty
Pack Mule is offline   Reply With Quote
Old 01-19-2019, 08:04 AM   #40
Guru
 
cafesport's Avatar
 
City: Miami
Join Date: Jul 2013
Posts: 619
Try a set of fiddle blocks from a sailboat main sheet or boom Vang. If they donít 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.Click image for larger version

Name:	IMG_0486.jpg
Views:	44
Size:	143.4 KB
ID:	84435
__________________

__________________
Via iOS.
cafesport is offline   Reply With Quote
Reply

Thread Tools Search this Thread
Search this Thread:

Advanced Search
Display Modes

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



» Trawler Port Captains
Port Captains are TF volunteers who can serve as local guides or assist with local arrangements and information. Search below to locate Port Captains near your destination. To learn more about this program read here: TF Port Captain Program





All times are GMT -5. The time now is 03:58 PM.


Powered by vBulletin® Version 3.8.8 Beta 4
Copyright ©2000 - 2021, vBulletin Solutions, Inc.
Search Engine Optimization by vBSEO 3.6.0
Copyright 2006 - 2012
×