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A note on the masthead sheaves (pulleys):
When they made the T27 type 1's the trend was to use a wire/rope halyard which was part wire and a spliced on section of rope.? The wire sections went through the mast to the top and conncected to a bit of rope.? To accommodate this Tartan installed "V" shaped sheaves in the sheave box (to handle the wire section).? For all rope halyards it is advisable to either re-shape the sheaves as I think Warren Stein described or get new "U" shaped sheaves which are more accommodating for rope.? The "V" shaped sheaves can handle modern rope but expect some chafing of the rope's outer cover in the places it goes through the sheave under pressure.? I think I used to replace my halyards about every 10 years as by then the cover was shot from chafing.? It is not a bad idea to inspect your sheave box if your mast is down to see what condition the original sheaves are in, as they can be abraded by the wire rope and have sharp edges showing if they are badly worn, which will chafe your rope halyard quickly.
Modern ropes like dyneema have made the wire/rope halyard mostly obsolete for boats around 27'.? Even Stay-Set-X did not exist when our boats were made.
As you were.
Caleb D
T27 #328
ny
?
-----Original Message-----
From: fred4936 via groups.io <fred4936@...> To: [email protected] Sent: Tue, Jun 16, 2020 8:12 pm Subject: Re: [T27Owners] Removing old mast wires, and mast cap question I rewired our mast a few years ago. It is a 27-2, so not sure if it is the same. The cap has some screws that go in from the side. Probably habe to be drilled out to get cap off. But you probably do not have to. I rewired mine with it on. I also replaced the two sheaves while it was down. With the sheaves out there was plenty of room. They use clevis pins as axles.? I think I used a snake to pull a messenger through, then pulled down the new harness with it. Zip ties were installed every 2-3 feet with tells left on in groups of three, so they can't slap inside, which was very annoying. There were two harnesses actually. One went all the way up, the other went to the bow light, foredeck light. There was a channel to house the wires, but it only went up the the bow light. The old wiring was not secured. Come to think of it, I may of used the old co-axial cable as the first messenger.
Fred Liesegang
Eagle #662
On Tuesday, June 16, 2020, 06:33:48 PM EDT, j c <anvil3a@...> wrote:
Hay All
This is a bit of a 2 part question I have my Mast down, so was checking the wiring, and found the mast had been rewired (YAAAaaaa). But the old wires where still in the mast just cut about 6" in (BOOoooo), and they are in there good, wont budge, wont pull out, and dont want to pull to hard for messing something else up. does anyone know how the original wires where attached, and how to take them lose? The second question is kind of related to the first, i also would like to run a new radio cable to the mast top and was wondering does the cap on the mast top come off? and if so How? Any help anyone may have would be greatly appreciated. |
