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 Can someone measure the masthead?		  New Topic  Topic Locked
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atgep
Master Marine Consultant

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1009 Posts
Initially Posted - 04/23/2004 :  18:13:53  Show Profile

I just got the rig back up last weekend rigged now for a spinnaker. I am unhappy with the interference between the headstay and the spin halyard. I found a metal shop who is willing to make me a spinnaker crane. I need to know the width of the head casting (truck) . I believe it to be around 2 inches but want to get a good fit. If I get this completed I will ask how much for a small run of them if people are interested. Thanks, Tom.
PO of 1988 Wing HN 5775
"Cote d'Azure"
Fleet 25
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Mark Maxwell
Captain

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USA
329 Posts
Response Posted - 04/23/2004 :  22:30:33  Show Profile
I can do it for you tomorrow. Boats in my driveway so it's easily done.
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dlucier
Master Marine Consultant

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Virgin Islands (United Kingdom)
7583 Posts
Response Posted - 04/23/2004 :  22:49:05  Show Profile
Tom,

These might help...





These are the plans I drew up for my crane. You can probably extrapolate the dimensions you need from them.

If you want these emailed to you, just let me know.
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atgep
Master Marine Consultant

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1009 Posts
Response Posted - 04/23/2004 :  23:14:23  Show Profile
Thanks. That is similar to what I was going to make. Is the width of the truck casting 2 inches? I am going to meet with the welder on Mon. He will do the work on the spot and told me it should take less than an hour to fab one up. Then I can drop the mast for fitting. If all go as planned it should be done for about $40. If I can do the finish work, grinding, burnishing, I will,to save the $$$. Thanks again, Tom.
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Frank Hopper
Past Commodore

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Pitcairn Island
6776 Posts
Response Posted - 04/23/2004 :  23:16:06  Show Profile  Visit Frank Hopper's Homepage
<blockquote id="quote"><font size="1" face="Verdana, Arial, Helvetica" id="quote">quote:<hr height="1" noshade id="quote"><i>Originally posted by dlucier</i>
<br />These are the plans I drew up for my crane. You can probably extrapolate the dimensions you need from them.
If you want these emailed to you, just let me know.
<hr height="1" noshade id="quote"></blockquote id="quote"></font id="quote">
It looks like a great item for the Mainsheet Cat 25 tech section, how about it? I stole the pictures, just give me a bit of text about the project. I think a lot of people would like to replicate it.
Please
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dlucier
Master Marine Consultant

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Virgin Islands (United Kingdom)
7583 Posts
Response Posted - 04/24/2004 :  00:27:31  Show Profile
<blockquote id="quote"><font size="1" face="Verdana, Arial, Helvetica" id="quote">quote:<hr height="1" noshade id="quote"><i>Originally posted by atgep</i>
<br />...Is the width of the truck casting 2 inches?...<hr height="1" noshade id="quote"></blockquote id="quote"></font id="quote">

I can't locate my notes from the project, but I believe the truck casting width is 1 3/4" (the drawing is fairly detailed with 1/8" squares) and you can see this in the top illustration (top view).

This is what I can remember from the project...

The crane was made from a piece of stainless steel and a stainless steel U-bolt (bow eye) from the boat store. The crane attaches at the clevis pins for the spinnaker block and forward sheaves. The original clevis pins were not long enough to span the new 2" width and I couldn't locate ones that would fit, so I purchased a couple of stainless steel bolts that had a minimum 2 1/2" smooth shoulder (5/16" diameter, I think). I then cut off the threaded portion of the bolt, filed the end smooth, and then drilled a small hole for a cotter pin. Very easy and cheap.

I remember I had a problem with the hole alignment after the piece was cut, drilled, and bent, that required some additional tweaking. This was caused because I made the crane to exact dimensions, but when I bent the pieces to form the U, the bends were a hair off which threw off the hole alignment a little. If I were making it again, I would probably bend it first, mark the holes from the mast truck itself, then drill.
Edited by - dlucier on 04/24/2004 00:50:13
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Happy D
Admiral

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921 Posts
Response Posted - 04/24/2004 :  10:30:06  Show Profile
My mast truck measures 1 3/4" wide. Actualy mine is 1.735" - 1.740".
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Mark Maxwell
Captain

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USA
329 Posts
Response Posted - 04/25/2004 :  02:14:06  Show Profile
Mine is the same, 1 3/4" X 11 1/4"
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atgep
Master Marine Consultant

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1009 Posts
Response Posted - 04/25/2004 :  08:47:18  Show Profile
Thanks for the legwork. I am going to have one built and will inqure about a price for a small run on them. First step is to get down there and get the thing made.

Tom.
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dlucier
Master Marine Consultant

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Virgin Islands (United Kingdom)
7583 Posts
Response Posted - 04/25/2004 :  08:49:09  Show Profile
Keep in mind that my measurements are for a standard rig masthead truck. The upper part of the tall rig masthead truck may be the same, but then again, maybe not.
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Frank Hopper
Past Commodore

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Pitcairn Island
6776 Posts
Response Posted - 04/25/2004 :  10:27:51  Show Profile  Visit Frank Hopper's Homepage
It is certainly not the same shape!
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