Cruisers Forum
 


Join CruisersForum Today

Reply
 
Thread Tools Rate Thread Display Modes
Old 20-09-2011, 08:23   #16
Senior Cruiser
 
S/V Antares's Avatar

Cruisers Forum Supporter

Join Date: Sep 2007
Location: Annapolis, Bahamas
Boat: 1983 Gulfstar 36
Posts: 1,249
Images: 1
Re: Adding Rope Clutch to Mast

You might consider "Nutserts" which aree like rivits but threaded. Much stronger than tapped thinwall mast and easy and you can remove the clutches if needed.

NUTSERTS from Aircraft Spruce
__________________

__________________
Will & Muffin
Lucy the dog

"Yes, well.. perhaps some more wine" (Julia Child)
S/V Antares is offline   Reply With Quote
Old 20-09-2011, 08:39   #17
Registered User

Join Date: Jan 2011
Location: PNW
Boat: custom teak ketch 48' Eastwind
Posts: 607
Images: 9
Re: Adding Rope Clutch to Mast

I find my rope clutches to be a pain in the ass every now and then. It seems like every time I'm in a hurry to get the jib down, the damn line gets a twist in it and jams up at the clutch. I wish there was a quick way to open the clutch and free the line. I'm not sure theyre worth the trouble as they are. It's fine when I've got 2 people on the fordeck but I sail alone most of the time it seems.
Anyone else had this trouble?
__________________

__________________
Geoduck is offline   Reply With Quote
Old 20-09-2011, 08:43   #18
Senior Cruiser

Cruisers Forum Supporter

Join Date: Dec 2006
Location: Seattle
Boat: Cal 40
Posts: 2,401
Images: 7
Re: Adding Rope Clutch to Mast

Quote:
Originally Posted by Geoduck View Post
I find my rope clutches to be a pain in the ass every now and then. It seems like every time I'm in a hurry to get the jib down, the damn line gets a twist in it and jams up at the clutch. I wish there was a quick way to open the clutch and free the line. I'm not sure theyre worth the trouble as they are. It's fine when I've got 2 people on the fordeck but I sail alone most of the time it seems.
Anyone else had this trouble?
Only when new crew coils my braided line instead of doing whatever the proper term for rabbit ears coiling is.

John
__________________
cal40john is offline   Reply With Quote
Old 20-09-2011, 12:23   #19
Registered User

Join Date: Jan 2011
Location: PNW
Boat: custom teak ketch 48' Eastwind
Posts: 607
Images: 9
Re: Adding Rope Clutch to Mast

Quote:
Originally Posted by cal40john View Post
Only when new crew coils my braided line instead of doing whatever the proper term for rabbit ears coiling is.

John
Yeah!
good point - I should know that - old fisherman that I am - we'll see if that works!
Muchas Gracias
__________________
Geoduck is offline   Reply With Quote
Old 20-09-2011, 12:29   #20
Senior Cruiser
 
DeepFrz's Avatar

Cruisers Forum Supporter

Join Date: Mar 2006
Location: Winnipeg
Boat: None at this time
Posts: 7,930
Re: Adding Rope Clutch to Mast

Those nutserts look nice but you need a compressor and special pneumatic tools. A lot of expense for a couple of clutches.
__________________
DeepFrz is offline   Reply With Quote
Old 20-09-2011, 13:25   #21
Senior Cruiser
 
hpeer's Avatar

Cruisers Forum Supporter

Join Date: Dec 2008
Location: Philadelphia
Boat: Murray 33-Chouette & Pape Steelmaid-44-Safara-both steel cutters
Posts: 3,899
Re: Adding Rope Clutch to Mast

Quote:
Those nutserts look nice but you need a compressor and special pneumatic tools. A lot of expense for a couple of clutches.
try a marsen tool, under $200 - manual and worked well for me.

325-RN Thread Setting Tool / 34604

Blind Rivet Guns and Blind Rivet Kits
__________________
hpeer is offline   Reply With Quote
Old 20-09-2011, 14:58   #22
Senior Cruiser
 
osirissail's Avatar

Cruisers Forum Supporter

Join Date: Feb 2009
Location: A real life Zombie from FL
Boat: Gulfstar 53 - Osiris
Posts: 5,416
Images: 2
Re: Adding Rope Clutch to Mast

Quote:
Originally Posted by S/V Antares View Post
You might consider "Nutserts" which aree like rivits but threaded. Much stronger than tapped thinwall mast and easy and you can remove the clutches if needed.

NUTSERTS from Aircraft Spruce
Okay, what is the metal they are made of? If it is not marine stainless steel they will rust out rather quickly. Something you don't need when they are holding the halyard that is holding up the mainsail or headsail.
- - You have to be very careful when trying to use land or aviation fittings on a salt water vessel.
__________________
osirissail is offline   Reply With Quote
Old 20-09-2011, 15:30   #23
Senior Cruiser
 
hpeer's Avatar

Cruisers Forum Supporter

Join Date: Dec 2008
Location: Philadelphia
Boat: Murray 33-Chouette & Pape Steelmaid-44-Safara-both steel cutters
Posts: 3,899
Re: Adding Rope Clutch to Mast

I used Marson klik rivit nuts. They don't say what kind of aluminum they are, but I doubt that they will rust. Don't know why you would use SS in this application.
__________________
hpeer is offline   Reply With Quote
Old 20-09-2011, 16:13   #24
Senior Cruiser
 
osirissail's Avatar

Cruisers Forum Supporter

Join Date: Feb 2009
Location: A real life Zombie from FL
Boat: Gulfstar 53 - Osiris
Posts: 5,416
Images: 2
Re: Adding Rope Clutch to Mast

Quote:
Originally Posted by hpeer View Post
. . . Don't know why you would use SS in this application.
If you are using stainless steel machine screws to hold the line clutch to the mast then using SS "rivet nuts" would make sense in order to reduce the bi-metallic interaction between aluminum and stainless steel. A problem that usually results in the machine screw corrosion welding to aluminum. Not to mention the huge increase in strength of a ss "rivet nut" versus an aluminum one with aluminum threads.
- - If such an animal - ss "rivet nuts" are not available then the discussion is moot as you can only use what you can get.
- - Strength is a major problem with stainless steel screwed into aluminum. Which is why I prefer to use aluminum pop rivets whenever possible. They fill the hole and expand out behind the mast wall. To remove the item I just use a drill bit to remove the head of the rivet and slide the item off the mast.
- - This might be where mounting an aluminum or stainless steel bracket onto the mast with rivets and then attaching the line clutch with ss machine screws and nuts might be a better solution especially if the mast is not very large.
__________________
osirissail is offline   Reply With Quote
Old 20-09-2011, 16:57   #25
Registered User
 
sabray's Avatar

Join Date: Aug 2008
Location: Wash DC
Boat: PETERSON 44
Posts: 3,169
I used to use these to repair aluminum doors. Attaching the panic bars. Last about a year before they deform. Not sure what grade aluminum it was but it was soft. They would last about a year.granted the loads are very different. The threads would strip out and the aluminum sleeve compressed into itself. These were impact loads being on a door not sheer loads. But wouldn't use them on my boat.
__________________
sabray is offline   Reply With Quote
Old 20-09-2011, 18:59   #26
Senior Cruiser
 
hpeer's Avatar

Cruisers Forum Supporter

Join Date: Dec 2008
Location: Philadelphia
Boat: Murray 33-Chouette & Pape Steelmaid-44-Safara-both steel cutters
Posts: 3,899
Re: Adding Rope Clutch to Mast

I'm gonna try to remember to take a photo of what I did and share it.

Not that I am to be copied, but done is done, right or wrong.

I tend to think I came up with a pretty good solution.

I'm sure there will be something to be learned from the criticism, good or bad.
__________________
hpeer is offline   Reply With Quote
Old 20-09-2011, 19:15   #27
Senior Cruiser
 
S/V Antares's Avatar

Cruisers Forum Supporter

Join Date: Sep 2007
Location: Annapolis, Bahamas
Boat: 1983 Gulfstar 36
Posts: 1,249
Images: 1
Re: Adding Rope Clutch to Mast

"Rivnuts", or "Rivit nuts", or "Nutserts" are available in several series Aluminium as well as stainless. The ones I quoted are aluminum. I also use "Pop" rivits for the same application. You can easily dtill them out if you need to change something.

Another link for other types: McMaster-Carr
__________________
Will & Muffin
Lucy the dog

"Yes, well.. perhaps some more wine" (Julia Child)
S/V Antares is offline   Reply With Quote
Old 20-09-2011, 20:09   #28
Registered User
 
sabray's Avatar

Join Date: Aug 2008
Location: Wash DC
Boat: PETERSON 44
Posts: 3,169
Mt concern using a nut insert. Not saying it won't work it's a clever piece. First is the process the aluminum is compressed and folded upon itself to complete the backing. With a blind rivet the metal is stretched and fatigued with a Knut sert it is folded and stretched compressed tortured if you will. the thread machining is loose. Maybe because the threads have already been subject to a large force creating the backer. Given what I have seen I would tap straight into the mast rather then Rely on this in the marine environment. Could be wrong no metallurgist. Just a gut thing
__________________
sabray is offline   Reply With Quote
Old 20-09-2011, 20:35   #29
Registered User

Join Date: May 2008
Posts: 1,967
Re: Adding Rope Clutch to Mast

The reason to use stainless screws here is that steel is much stronger than aluminum. The clutch is designed so that the rope exits close to the mast. This causes the force to be almost entirely sheer force that is perpendicular to the screw. The "pull out" force on the threads isn't really significant.

For a given diameter, stainless steel has a much higher sheer strength than aluminum and solid screws have a much higher sheer strength than hollow rivets.

Stainless can suffer galvanic corrosion with aluminum but Tef-gel works great.

Carl
__________________
CarlF is offline   Reply With Quote
Old 07-10-2011, 13:31   #30
Senior Cruiser
 
hpeer's Avatar

Cruisers Forum Supporter

Join Date: Dec 2008
Location: Philadelphia
Boat: Murray 33-Chouette & Pape Steelmaid-44-Safara-both steel cutters
Posts: 3,899
Re: Adding Rope Clutch to Mast

Here are a couple of pics of what I did to mount rope clutches.
Attached Thumbnails
Click image for larger version

Name:	IMG_2065 small.jpg
Views:	166
Size:	401.0 KB
ID:	32444   Click image for larger version

Name:	IMG_2066 small.jpg
Views:	193
Size:	396.4 KB
ID:	32445  

__________________

__________________
hpeer is offline   Reply With Quote
Reply

Tags
clutch, mast

Thread Tools
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
Mast Came Down, Must Repair Acedude Construction, Maintenance & Refit 7 30-08-2011 14:01
Using a Windlass to Haul Someone Up the Mast callistov42 Deck hardware: Rigging, Sails & Hoisting 15 30-08-2011 08:28
Adding a Mainsail Furler VirtualVagabond Deck hardware: Rigging, Sails & Hoisting 26 10-07-2011 04:34
For Sale: Sailboat Mast Extrusion vientoman Classifieds Archive 0 06-07-2011 12:51
For Sale: 58' Tall Mast / 34' Tall Mast thesparrow Classifieds Archive 0 13-06-2011 13:07



Copyright 2002- Social Knowledge, LLC All Rights Reserved.

All times are GMT -7. The time now is 03:10.


Google+
Powered by vBulletin® Version 3.8.8 Beta 1
Copyright ©2000 - 2017, vBulletin Solutions, Inc.
Social Knowledge Networks
Powered by vBulletin® Version 3.8.8 Beta 1
Copyright ©2000 - 2017, vBulletin Solutions, Inc.

ShowCase vBulletin Plugins by Drive Thru Online, Inc.