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 Masthead measurement?		  New Topic  Reply to Topic
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smd
1st Mate

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25 Posts
Initially Posted - 01/16/2021 :  12:04:39  Show Profile  Reply with Quote
Hi,

Could anyone who happens to have their rig down provide me with some dimensional info on the masthead? Mostly I need to know the angle at the top, so that I can make a shim that will provide a flat surface for a transducer mount. If anyone can measure for me that would be great. I looked for a diagram or template online but couldn't find anything drawn to scale. Thanks.
Steven 1984 C-25 SR/SK

keats
Navigator

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USA
215 Posts
Response Posted - 01/16/2021 :  12:28:49  Show Profile  Reply with Quote
Appears to be a dimensioned drawing in this thread.

http://www.catalina-capri-25s.org/forum/topic.asp?ARCHIVE=true&TOPIC_ID=27742

Note that standard rig and tall rig have different castings. I would imagine the angle is probably the same though.
Tim Keating
1985 C-25 TR/FK #4940
Midsummer
Lake Don Pedro, CA
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smd
1st Mate

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25 Posts
Response Posted - 01/16/2021 :  13:22:47  Show Profile  Reply with Quote
I saw that one, but also noticed that it said it's not to scale. Looks pretty dang through, though. I'll bet it's about right. Thanks.
Steven 1984 C-25 SR/SK
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Lee Panza
Captain

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USA
465 Posts
Response Posted - 01/17/2021 :  21:10:50  Show Profile  Visit Lee Panza's Homepage  Reply with Quote

Will this help?



I don't have the transverse dimensions but this photo should give you a pretty good idea, since the dimensions of the mast extrusion are known:
The trouble with a destination - any destination, really - is that it interrupts The Journey.

Lee Panza
SR/SK #2134
San Francisco Bay
(Brisbane, CA)
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smd
1st Mate

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25 Posts
Response Posted - 01/17/2021 :  23:35:22  Show Profile  Reply with Quote
Lee: that is PERFECT. Thanks so much.
Steven 1984 C-25 SR/SK
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Voyager
Master Marine Consultant

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5231 Posts
Response Posted - 01/19/2021 :  11:25:57  Show Profile  Reply with Quote
This should become tech topic. I’m certain that many C25 boaters would like to create attachments for their mast tops like WiFi repeaters, bird spikes or video cameras , but can’t do the pre-planning because they don’t have the design specifics. This image clearly shows the details. How can members publish articles to the tech topics?
Bruce Ross
Passage ~ SR-FK ~ C25 #5032

Port Captain — Milford, CT
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Lee Panza
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465 Posts
Response Posted - 01/19/2021 :  23:08:36  Show Profile  Visit Lee Panza's Homepage  Reply with Quote
I'll submit something on this to Tech Tips (there are instructions there about submitting). It's true, this area is quite difficult to reach in order to take measurements.
The trouble with a destination - any destination, really - is that it interrupts The Journey.

Lee Panza
SR/SK #2134
San Francisco Bay
(Brisbane, CA)
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smd
1st Mate

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25 Posts
Response Posted - 03/04/2021 :  08:27:47  Show Profile  Reply with Quote
Follow-up here. I made up a little shim/mount that would counter the 6-degree decline of the masthead. I used a piece of teak. But then I was chatting with my upstairs neighbor and he actually fabricated an aluminum version with the CNC machine he has in his apartment. Here's a pic I took during install. Lee Panza, given your engineer-style diagrams, I thought you'd appreciate my neighbor's work (if you look very closely you can see he even bevelled the edge). Anyway, thanks for the helpful info!



-Steven
Steven 1984 C-25 SR/SK
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keats
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215 Posts
Response Posted - 03/04/2021 :  13:43:17  Show Profile  Reply with Quote
Looks like an outstanding piece of work.
Tim Keating
1985 C-25 TR/FK #4940
Midsummer
Lake Don Pedro, CA
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Lee Panza
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465 Posts
Response Posted - 03/06/2021 :  00:32:32  Show Profile  Visit Lee Panza's Homepage  Reply with Quote
That's a nice looking fabrication, Steven. This is considerably more sophisticated than the simple shim you initially seemed to be talking about. But I'm having trouble understanding what I'm seeing. Can you post a couple of other views (and, perhaps, a tad larger)?
The trouble with a destination - any destination, really - is that it interrupts The Journey.

Lee Panza
SR/SK #2134
San Francisco Bay
(Brisbane, CA)
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smd
1st Mate

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25 Posts
Response Posted - 03/07/2021 :  10:23:35  Show Profile  Reply with Quote
The part my neighbor made is far more sophisticated than needed. He did it for fun and practice. I just took a couple of pics when I was aloft, but here you go.

Steven 1984 C-25 SR/SK
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Lee Panza
Captain

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465 Posts
Response Posted - 03/07/2021 :  19:08:15  Show Profile  Visit Lee Panza's Homepage  Reply with Quote
OK, I'll apologize if I'm misinterpreting this, but I'm guessing the dark-anodized component is the Garmin-supplied base to hold the arm, and the part your friend made is the bright-finish tapered-slab adapter between it and the masthead casting. I see that he put a bevel around the top surface. Nice work!

But, does Garmin really think tamper-resistant screws are necessary at the top of a mast?
The trouble with a destination - any destination, really - is that it interrupts The Journey.

Lee Panza
SR/SK #2134
San Francisco Bay
(Brisbane, CA)
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smd
1st Mate

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25 Posts
Response Posted - 03/12/2021 :  15:28:47  Show Profile  Reply with Quote
That's exactly right, Lee, the shiny part is the adapter. And, you know, crows are super smart!
Steven 1984 C-25 SR/SK
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Notice: The advice given on this site is based upon individual or quoted experience, yours may differ.
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