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Sheave size on sparcraft rig

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ChrisHanse400 View Drop Down
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    Posted: 08 May 2022 at 08:37
good morning all, we had the unfortunate event of our main halyard slipping off the sheave yesterday and our main getting stuck up. Assuming the sheaves are cooked so going to replace so it doesn’t happen again. Anyone done this job on a sparcraft? If so, can you do it up the mast or do you need a crane? And what size are the sheaves for all halyards? 
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Ggerrit View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote Ggerrit Quote  Post ReplyReply Direct Link To This Post Posted: 08 May 2022 at 09:05
Hi,
You can do it in the mast. Note, you need two sheaves. 48510801525 - Delrin Sheave 80x15 
H400 2008 2 cabin
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ChrisHanse400 View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote ChrisHanse400 Quote  Post ReplyReply Direct Link To This Post Posted: 08 May 2022 at 09:54
ah amazing news! Delrin sheaves? Are those the measurements 80x15mm? 
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ChrisHanse400 View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote ChrisHanse400 Quote  Post ReplyReply Direct Link To This Post Posted: 08 May 2022 at 10:38
is that the Sparcraft part number? Just had a google and couldn’t find any 80mm Delrin sheaves. Hopefully find a UK supplier of those. 
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Ggerrit View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote Ggerrit Quote  Post ReplyReply Direct Link To This Post Posted: 08 May 2022 at 12:25
I bought them from the Dutch sparcraft dealer "neutmast"for appr 20 euro incl shipping.
The number is  from the 2018 cataloge.
H400 2008 2 cabin
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Ggerrit View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote Ggerrit Quote  Post ReplyReply Direct Link To This Post Posted: 08 May 2022 at 12:29
H400 2008 2 cabin
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ChrisHanse400 View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote ChrisHanse400 Quote  Post ReplyReply Direct Link To This Post Posted: 08 May 2022 at 12:56
great! Thank you for this. Also very happy they can be replaced while up the mast. I’m assuming go up on kite halyard and Jib halyard for a secondary. You’d have a bit of a fall of Kite halyard went of course but less than falling to the deck right
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DJgun View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote DJgun Quote  Post ReplyReply Direct Link To This Post Posted: 08 May 2022 at 15:04
the problem using jib halyard is you have to pull upwards to get to mast head. So, if  Spinnaker halyard fails you drop at thest twice the distance from jib sheave to masthead. But as you say it would hopefully be preferable to full mast drop.

Good luck.
DJ Sailor Ordinaire
HIN DE-HANJ0331J708
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ChrisHanse400 View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote ChrisHanse400 Quote  Post ReplyReply Direct Link To This Post Posted: 08 May 2022 at 15:10
yeah, I think dyneema strop around the mast head when you come off the topping lift as secondary. 
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Rock View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote Rock Quote  Post ReplyReply Direct Link To This Post Posted: 05 August 2022 at 12:05
Gerrit,

When you mention 2 sheaves, you refer to the other sheave being the sheave for the topping lift, correct?

I.e., better replace them both.

Was there need to replace the Clevis pin, was it worn (in line with a similar post about a 545 recently) ?

Did anybody replace the 2 forward sheaves yet? 
I guess they see less wear, the jib halyard stays tensioned most of the time and  doesn’t see as much  movement as the main halyard.
These seem more tricky to replace while being up in a bosuns chair.

Thanks,
Peter 
Hanse 400e "M-square2" #0241
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