Halyards and mast head sheaves on M17
The wire section on my jib halyard is not long enough to reach to the deck at the stem fitting. When the jib is hauled down the top 2 hanks are still up on the forestay. The rope to wire splice is stopped at the masthead. I can get a new longer wire spliced on, or I was thinking about converting to all rope. However in looking at the masthead casting, there is not enough room for wider sheaves to handle rope. The casting only has a 3/4" slot where the sheaves are mounted. Has anyone done this conversion to rope? If so did you have to change the mast head to another casting? Where does Bob get the masts and fittings from? Dwyer or other? Thanks Bill Wickett M17
Bill, I did the conversion to rope when I put on line to lead the halyards and topping lift back to the cockpit for single handing. My M-17 is a '75 so I cannot speak for all the possible mast head configurations, but for mine the sheaves were plastic and in pieces so I replaced the sheaves. Bob at Norsea was kind enough to supply me with new metal (aluminum I think) sheaves and described turning the sheaves to open the slot for the rope halyards. I looked at procuring sheaves at Dwyer and others but could not find the right replacement size. It looks like the rope/line that I used measures about 0.2" diameter. The opening of the sheaves needs to be opened a bit which I did by chucking the sheaves in a drill press and using a flat file to grind the opening a bit larger. Bob did one or two that way for me as examples. If I remember right this is what Bob is doing for the new M boats. Hope this helps. Robbin Bill Wickett wrote:
The wire section on my jib halyard is not long enough to reach to the deck at the stem fitting. When the jib is hauled down the top 2 hanks are still up on the forestay. The rope to wire splice is stopped at the masthead. I can get a new longer wire spliced on, or I was thinking about converting to all rope. However in looking at the masthead casting, there is not enough room for wider sheaves to handle rope. The casting only has a 3/4" slot where the sheaves are mounted. Has anyone done this conversion to rope? If so did you have to change the mast head to another casting? Where does Bob get the masts and fittings from? Dwyer or other? Thanks
Bill Wickett M17 _______________________________________________ http://mailman.xmission.com/cgi-bin/mailman/listinfo/montgomery_boats
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Bill- If this is one of my boats the sheaves for both the main ands jib are 3/8, so if you convert to all line halyards there is plenty of room for 5/16. jerry ----- Original Message ----- From: "Bill Wickett" <billwick@gmail.com> To: "For and about Montgomery Sailboats" <montgomery_boats@mailman.xmission.com> Sent: Friday, November 27, 2009 6:24 AM Subject: M_Boats: Halyards and mast head sheaves on M17
The wire section on my jib halyard is not long enough to reach to the deck at the stem fitting. When the jib is hauled down the top 2 hanks are still up on the forestay. The rope to wire splice is stopped at the masthead. I can get a new longer wire spliced on, or I was thinking about converting to all rope. However in looking at the masthead casting, there is not enough room for wider sheaves to handle rope. The casting only has a 3/4" slot where the sheaves are mounted. Has anyone done this conversion to rope? If so did you have to change the mast head to another casting? Where does Bob get the masts and fittings from? Dwyer or other? Thanks
Bill Wickett M17 _______________________________________________ http://mailman.xmission.com/cgi-bin/mailman/listinfo/montgomery_boats
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Jerry, It is a Bob boat. 2003. All 4 sheaves are .375 wide, with a .142 wide groove. So there is room to turn the groove wider and deeper for 5/16 line. Just have to make sure I ease/radius the remaining edges and also ease the edges on the mast head casting to reduce/prevent any chafe on the lines. I might check around for delrin sheaves that fit, or delrin blanks and turn them at the shop. I can call Dwyer and check their available sizes. Bill On Fri, Nov 27, 2009 at 11:19 AM, jerry <jerry@jerrymontgomery.org> wrote:
Bill- If this is one of my boats the sheaves for both the main ands jib are 3/8, so if you convert to all line halyards there is plenty of room for 5/16.
jerry ----- Original Message ----- From: "Bill Wickett" <billwick@gmail.com> To: "For and about Montgomery Sailboats" < montgomery_boats@mailman.xmission.com> Sent: Friday, November 27, 2009 6:24 AM Subject: M_Boats: Halyards and mast head sheaves on M17
The wire section on my jib halyard is not long enough to reach to the deck
at the stem fitting. When the jib is hauled down the top 2 hanks are still up on the forestay. The rope to wire splice is stopped at the masthead. I can get a new longer wire spliced on, or I was thinking about converting to all rope. However in looking at the masthead casting, there is not enough room for wider sheaves to handle rope. The casting only has a 3/4" slot where the sheaves are mounted. Has anyone done this conversion to rope? If so did you have to change the mast head to another casting? Where does Bob get the masts and fittings from? Dwyer or other? Thanks
Bill Wickett M17 _______________________________________________ http://mailman.xmission.com/cgi-bin/mailman/listinfo/montgomery_boats
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_______________________________________________ http://mailman.xmission.com/cgi-bin/mailman/listinfo/montgomery_boats
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Bill: Samson makes a rope called Amsteel™ that is stronger than steel and in small enough diameters to directly replace you wire halyard. It takes special knotting or splicing to hold, but is worth looking into. ⎈--Gary ☺ On Nov 27, 2009, at 6:24 AM, Bill Wickett wrote:
The wire section on my jib halyard is not long enough to reach to the deck at the stem fitting. When the jib is hauled down the top 2 hanks are still up on the forestay. The rope to wire splice is stopped at the masthead. I can get a new longer wire spliced on, or I was thinking about converting to all rope. However in looking at the masthead casting, there is not enough room for wider sheaves to handle rope. The casting only has a 3/4" slot where the sheaves are mounted. Has anyone done this conversion to rope? If so did you have to change the mast head to another casting? Where does Bob get the masts and fittings from? Dwyer or other? Thanks
Bill Wickett M17 _______________________________________________ http://mailman.xmission.com/cgi-bin/mailman/listinfo/montgomery_boats
Remember, there is no privacy on the Internet!
I replaced the wire/rope halyards on my early (Jerry Montgomery built M17) with 3/8 inch Vectra using the origonal aluminum sheaves and it works great. I have all lines run through turning blocks and led to cam cleats on the aft edge of the housetop. I also have a winch there to tighten the jib halyard. With the very hard fiber, small diameter line, sailing gloves are nice. Whitebeard M17 #14, Griselda ( fin/bulb keel) Lake Livingston, Texas.
From: gmhyde1@mac.com Date: Fri, 27 Nov 2009 15:33:49 -0800 To: montgomery_boats@mailman.xmission.com Subject: Re: M_Boats: Halyards and mast head sheaves on M17
Bill: Samson makes a rope called Amsteel™ that is stronger than steel and in small enough diameters to directly replace you wire halyard. It takes special knotting or splicing to hold, but is worth looking into. ⎈--Gary ☺
On Nov 27, 2009, at 6:24 AM, Bill Wickett wrote:
The wire section on my jib halyard is not long enough to reach to the deck at the stem fitting. When the jib is hauled down the top 2 hanks are still up on the forestay. The rope to wire splice is stopped at the masthead. I can get a new longer wire spliced on, or I was thinking about converting to all rope. However in looking at the masthead casting, there is not enough room for wider sheaves to handle rope. The casting only has a 3/4" slot where the sheaves are mounted. Has anyone done this conversion to rope? If so did you have to change the mast head to another casting? Where does Bob get the masts and fittings from? Dwyer or other? Thanks
Bill Wickett M17 _______________________________________________ http://mailman.xmission.com/cgi-bin/mailman/listinfo/montgomery_boats
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_______________________________________________ http://mailman.xmission.com/cgi-bin/mailman/listinfo/montgomery_boats
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Continuing on this sheave thread from November, I found this company in Port Townsend that makes black delrin sheaves with bronze bushings. Had me a quote back in 3 hours for replacement 1 1/4' x 3/8" sheaves. Has anyone dealt with him? I will be able to use 5/16" line which is the current diameter on my rope/wire halyards. 3/8" will chafe against the side of the mast head casting. http://zephyrwerks.com/ Thanks for everyone's earlier input. Bill On Fri, Nov 27, 2009 at 7:28 PM, Ronnie Keeler <ronkeeler@hotmail.com>wrote:
I replaced the wire/rope halyards on my early (Jerry Montgomery built M17) with 3/8 inch Vectra using the origonal aluminum sheaves and it works great. I have all lines run through turning blocks and led to cam cleats on the aft edge of the housetop. I also have a winch there to tighten the jib halyard. With the very hard fiber, small diameter line, sailing gloves are nice.
Whitebeard
M17 #14, Griselda ( fin/bulb keel)
Lake Livingston, Texas.
From: gmhyde1@mac.com Date: Fri, 27 Nov 2009 15:33:49 -0800 To: montgomery_boats@mailman.xmission.com Subject: Re: M_Boats: Halyards and mast head sheaves on M17
Bill: Samson makes a rope called Amsteel™ that is stronger than steel and in small enough diameters to directly replace you wire halyard. It takes special knotting or splicing to hold, but is worth looking into. ⎈--Gary ☺
On Nov 27, 2009, at 6:24 AM, Bill Wickett wrote:
The wire section on my jib halyard is not long enough to reach to the deck at the stem fitting. When the jib is hauled down the top 2 hanks are still up on the forestay. The rope to wire splice is stopped at the masthead. I can get a new longer wire spliced on, or I was thinking about converting to all rope. However in looking at the masthead casting, there is not enough room for wider sheaves to handle rope. The casting only has a 3/4" slot where the sheaves are mounted. Has anyone done this conversion to rope? If so did you have to change the mast head to another casting? Where does Bob get the masts and fittings from? Dwyer or other? Thanks
Bill Wickett M17 _______________________________________________ http://mailman.xmission.com/cgi-bin/mailman/listinfo/montgomery_boats
Remember, there is no privacy on the Internet!
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Remember, there is no privacy on the Internet!
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participants (5)
-
Bill Wickett -
Gary M Hyde -
jerry -
robbin roddewig -
Ronnie Keeler