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Mast Foot TurningBlocks

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Old Racer View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote Old Racer Quote  Post ReplyReply Direct Link To This Post Topic: Mast Foot TurningBlocks
    Posted: 13 January 2022 at 13:43
Our mast has to come off the boat for inspection this year.

This gives us the opportunity to renew the turning blocks at the base of the mast.

I could replace with basically as is with a turning block with a metal shackle to anchor it.

Or would it be worth considering the use of soft shackles with the blocks or go for the low friction blocks and soft shackles.

Has any one done this and or any thoughts on the matter?

Many Thanks
John

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Hanse 320 Olicana Inverkip Scotland
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Wayne's World View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote Wayne's World Quote  Post ReplyReply Direct Link To This Post Posted: 13 January 2022 at 15:06
We use low friction rings to divert a line but I think there is still too much friction once you get closer to 90 degrees and higher. Go with a block. 
Wayne W
Cruising, currently in the Caribbean and will head across the Pacific early 2023
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Brufan View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote Brufan Quote  Post ReplyReply Direct Link To This Post Posted: 13 January 2022 at 16:21
You can go for friction rings... but only for static loads (vang, outhaul, ..) not for halyards since there's too much friction. 
Best for this purpose is roller (needles) blocks but ££££££
Bruno

hanse 355 - 57

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White hull, 2 cabins, Volvo D1-30, Selden rig, removable mainsheet track system (modifications done now), Simrad-Jefa autopilot.
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Martin&Rene View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote Martin&Rene Quote  Post ReplyReply Direct Link To This Post Posted: 13 January 2022 at 16:25
I have used a few Barton Marine ball bearing blocks for the reefing lines on a 341.  They do not have as high a loading capacity as Harken blocks, but much cheaper.
Martin&Rene Hanse 341 Dipper Wheel steering, 3 cabin layout, normally based in Scotland
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samuel View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote samuel Quote  Post ReplyReply Direct Link To This Post Posted: 14 January 2022 at 11:36
Friction rings do create quite a pinch point if turning through 90 degrees. Even with dynema halyards I would expect some movement of the ropes, albeit very small, due to mast movement, sail flex etc. So I would not rule out chaffe.
A decent block , say 65mm diam wheel, gives a better radius & the wheel moves with the rope.
Like Martin & Rene I use Barton blocks, but my boat is smaller than theirs. I do not use roller bearing blocks on the mast base as I suspect the constant load on the delrin might cause distortion. I do, however, use them on the reef lines at the luff & they are 12 mm line ones with 8mm reef lines for friction purposes
That being said I do have a couple of friction rings set loose at the mast base for emergencies, because I have had the old Lewmar turning blocks supplied with the boat break. They were useless & the mainsheet & ST car ones collapsed as well.


Edited by samuel - 14 January 2022 at 11:40
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Old Racer View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote Old Racer Quote  Post ReplyReply Direct Link To This Post Posted: 14 January 2022 at 13:24
Thanks to all for the advice. It is in line with my thoughts, all be it I wanted to check.

Once again thanks for the replies

John 
Hanse 320 Olicana Inverkip Scotland
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Merinalle View Drop Down
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Post Options Post Options   Thanks (1) Thanks(1)   Quote Merinalle Quote  Post ReplyReply Direct Link To This Post Posted: 14 January 2022 at 18:26

I think this old thread may give some ideas:

https://www.myhanse.com/mast-base-blocks-swl-850-kg-and-6-mm-clevis-pin_topic5237_page4.html

I wrote almost eight years ago, that We have used those Rutgerson blocks two seasons, and are really satisfied. Now we have experience from ten seasons, and still we are satisfied with them.

320#166
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