Chotu's Rigging Thread - Time to Go Fast

[Tupaia]

That price for custom sheaves is not unreasonable.


With regards to the reefs.

How many sheaves are there at the end of your boom?
If you only have 3 then out-haul, reef and reef, only allows for two reefs
If you have 4 then out-haul, reef, reef, reef, it would be silly not to have all three roved.

[Chotu]

Originally Posted by Tupaia

That price for custom sheaves is not unreasonable.


With regards to the reefs.

How many sheaves are there at the end of your boom?
If you only have 3 then out-haul, reef and reef, only allows for two reefs
If you have 4 then out-haul, reef, reef, reef, it would be silly not to have all three roved.

5 sheaves at the end of the boom.

[Chotu]

Originally Posted by neilpride

Around 90 bucks by sheave, custom made, not bad...

that does sound pretty good. And that includes shipping. And an expediting fee. And expedited shipping

[smj]

Originally Posted by Chotu

I’m shooting for a 5 inch pre-bend with a 3.5ft-4ft rake. On a 65ft spar section.

just in case some of the discussion above talking about those quantities has any bearing on anything

Didn’t the mast come with a mainsail? If so then the sail should determine the pre bend if you plan on using it?

[Chotu]

Originally Posted by smj

Didn’t the mast come with a mainsail? If so then the sail should determine the pre bend if you plan on using it?

It did.

which I guess only complicates things more.

maybe the sailmaker and Rigger can work together on that.

they are already doing a re-cut of the jib

[Chotu]

Mainsail: 3 reef points. Sail maker just let me know.

[CarlF]

$90 delivered for a custom made delrin sheave with oil bronze bearing seems a great price.

When you mount them pay attention to their instructions that the axle has to be perfectly perpendicular to the box walls or the sheave will rub on the box and never be satisfactory.

Although you really only need this on the masthead sheaves. The other's aren't as loaded. But finding excactly the right pre-made sizes for the others - in stock - to save maybe $50/sheave delivered seems hardly worth it.

[Chotu]

Originally Posted by CarlF

$90 delivered for a custom made delrin sheave with oil bronze bearing seems a great price.

When you mount them pay attention to their instructions that the axle has to be perfectly perpendicular to the box walls or the sheave will rub on the box and never be satisfactory.

Although you really only need this on the masthead sheaves. The other's aren't as loaded. But finding excactly the right pre-made sizes for the others - in stock - to save maybe $50/sheave delivered seems hardly worth it.

Yeah. I am very impressed with the quality of the product. Or at least I think I will be from what I saw on his website.

I don’t have any control over the axle actually. It just fits into these places that are the same size as the axle. It slides into place. Some sheave boxes are welded into the mast or whatever. There are holes throughout the thing and you just slide the pin into the holes then you put a little cap on it. And close the mast up completely.

There aren’t any adjustments to make.

I’ll try to take some pictures of that when I put the sheaves in

[Sailorman Ed]

Summary of sheaves:
$1036 from Ed at ZephyrWorks in WA.

He made some for me, I was very pleased with the results

[Tupaia]

Originally Posted by Chotu

5 sheaves at the end of the boom.

So put the lines in for all three reefs and the out-haul. Its a no brainer.

[Chotu]

Originally Posted by Tupaia

So put the lines in for all three reefs and the out-haul. Its a no brainer.

But that’s not what was suggested. So there might be a little bit more to this I think.

Like Rslifkin was talking about.

[rslifkin]

Originally Posted by Chotu

But that’s not what was suggested. So there might be a little bit more to this I think.

Like Rslifkin was talking about.

Being that you have enough sheaves, if you can reasonably rig all 3 reefs without the extra lines and clutter becoming a problem, then it won't hurt to do it. The 2 lines for 3 reefs method is mostly for when you don't have enough sheaves to route a 3rd reefing line or when you can't handle the extra lines otherwise (in terms of routing, clutches, etc.).

[Chotu]

OK. I think he was mentioning that it’s just a lot of drag having all of those lines everywhere. Makes it more difficult to manage

I guess I will check tomorrow morning. We have a meeting tomorrow morning about several things. I will find out what the story is

[rslifkin]

Originally Posted by Chotu

OK. I think he was mentioning that it’s just a lot of drag having all of those lines everywhere. Makes it more difficult to manage

I guess I will check tomorrow morning. We have a meeting tomorrow morning about several things. I will find out what the story is

Yup, that's one of those things that goes into deciding if the extra line clutter causes a problem. You can always rig all 3 and remove one later if you decide it's more of a pain than it's worth.

[Tupaia]

Originally Posted by s/v Jedi

I have the feeling you are absolutely right, but I’m having trouble envisioning how the luff is pulled away from the mast…

I obviously am missing clues because I’m having trouble hoisting our main which I think has the same kind of trouble, but then again, I can reed just fine.

Why do have cats kicked up booms? Because there’s no room for the aft end? Mine is almost horizontal (sail cut up a bit at the leech) but the end of the boom goes up higher for each reef point, to keep it away from the water, which should not be a problem for a cat…

Excuse sketch. As can be seen the distance x is shorter than y so if the reef clew is pulled down before the sail / batten is allowed to lay on the boom it will have the effect of trying to pull the luff away from the mast z. Positioning the battens above the reef points allows the sail to flake onto the boom before being pinned. Having a down haul line on the luff allows it to be pulled down onto the boom before snugging down the leech line.
None of this occurs on vertical masts and horizontal booms typically found on monos.