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Search took 0.00 seconds. Search: Posts Made By: coopec43
Forum: Construction, Maintenance & Refit 30-11-2018, 14:02
Replies: 47
Views: 7,183
Posted By coopec43
Re: Steering sheaves / pulleys

Thanks for that but it sounds like conduit?


The experts have specifically warned me against that as you cannot monitor the condition of the cable and they pointed out that you don't use plastic...
Forum: Construction, Maintenance & Refit 28-11-2018, 20:55
Replies: 47
Views: 7,183
Posted By coopec43
Re: Steering sheaves / pulleys

Thank you thunderhoof.


Your post is very reassuring coming from someone with first-hand knowledge of the matter: been their, done that.

3. Easier to install. Leading wire rope around
your...
Forum: Construction, Maintenance & Refit 27-11-2018, 02:57
Replies: 47
Views: 7,183
Posted By coopec43
Re: Steering sheaves / pulleys

My yacht is a center cockpit so the steering cable is quite long and the yacht has a large unbalanced rudder.

I have decided to use Dyneema instead of SS cable so sheave diameter is not so...
Forum: Construction, Maintenance & Refit 27-11-2018, 02:27
Replies: 47
Views: 7,183
Posted By coopec43
Re: Steering sheaves / pulleys

I'm not familiar with your ^ symbol. But could you solve the equation to find a result? Please.

Just Now The penny dropped! The "2" is supposed to be a power? ie "squared".

I just had a...
Forum: Construction, Maintenance & Refit 27-11-2018, 00:33
Replies: 47
Views: 7,183
Posted By coopec43
Re: Steering sheaves / pulleys

This formula came from an excellent article on the elasticity of SS cable which I have bookmarked for my future reference.

According to my calculations (can someone check me?) a 100kg load on a 4...
Forum: Construction, Maintenance & Refit 26-11-2018, 14:28
Replies: 47
Views: 7,183
Posted By coopec43
Re: Steering sheaves / pulleys

I think I have it worked out.

Some yachts are aft cockpit and have their pedestal virtually over the top of the quadrant so only need about 3 ft of steering cable. We know all cables stretch under...
Forum: Construction, Maintenance & Refit 25-11-2018, 23:53
Replies: 47
Views: 7,183
Posted By coopec43
Re: Steering sheaves / pulleys

Apparently others have no objection to cast iron sheaves on boats.


https://stainlessdirect.co.uk/index.php?main_page=product_info&cPath=210_218&products_id=1203


Clive
Forum: Construction, Maintenance & Refit 25-11-2018, 21:35
Replies: 47
Views: 7,183
Posted By coopec43
Re: Steering sheaves / pulleys

Why does Edson stipulate ¼ in. cable if the loads are so light?

Of course the yacht must be able to withstand an extreme event like a grounding or a Force 12 Gale.
Forum: Construction, Maintenance & Refit 25-11-2018, 19:56
Replies: 47
Views: 7,183
Posted By coopec43
Re: Steering sheaves / pulleys

Sorry your maths are wrong!


Did you read the article?


If you have a look at the Edson table I posted above you would see what you are suggesting is wrong.
Forum: Construction, Maintenance & Refit 25-11-2018, 16:52
Replies: 47
Views: 7,183
Posted By coopec43
Re: Steering sheaves / pulleys

Well I didn't know this.


"With suitable alloying, the corrosion resistance of cast iron can equal to or exceed that of stainless steel and nickel (Ni) based alloy. Since outstanding properties...
Forum: Construction, Maintenance & Refit 25-11-2018, 15:27
Replies: 47
Views: 7,183
Posted By coopec43
Re: Steering sheaves / pulleys

I'm getting advice from Taskers and feel quite confident of their experience.
My yacht is not a racing yacht but a heavy cruising yacht. I think Rostan equipment is too light and expensive.
...
Forum: Construction, Maintenance & Refit 25-11-2018, 15:01
Replies: 47
Views: 7,183
Posted By coopec43
Re: Steering sheaves / pulleys

Rowglide QUOTE If I got 4000lbs of pull on a cable, that would translate to roughly 1/18th of that at the rim of a 36" wheel (https://www.cruisersforum.com/forums/tags/wheel.html) (sprocket is 2")...
Forum: Construction, Maintenance & Refit 25-11-2018, 14:37
Replies: 47
Views: 7,183
Posted By coopec43
Re: Steering sheaves / pulleys

That's when you need a strong steering system! Tidal currents can be very strong in places.

Of course if you happen to run aground the stresses on the steering could be enormous too.


Clive
Forum: Construction, Maintenance & Refit 25-11-2018, 14:31
Replies: 47
Views: 7,183
Posted By coopec43
Re: Steering sheaves / pulleys

Thanks for that. Originally I was going to use SS cable but have now switched to Dyneema.


Clive
Forum: Construction, Maintenance & Refit 25-11-2018, 14:29
Replies: 47
Views: 7,183
Posted By coopec43
Re: Steering sheaves / pulleys

The yacht riggers said that too but they said I'd get a more positive feel at the helm if I used 10 mm.


I agree 7/19 SS cable will break down if the pulleys are too small. I have now decided to...
Forum: Construction, Maintenance & Refit 25-11-2018, 14:24
Replies: 47
Views: 7,183
Posted By coopec43
Re: Steering sheaves / pulleys

The article which I gave the link to says you get mechanical advantage from the wheel as well as the quadrant is 80/1. They went on to say when the force at the rudder is 3700 lb the force at the...
Forum: Construction, Maintenance & Refit 25-11-2018, 14:09
Replies: 47
Views: 7,183
Posted By coopec43
Re: Steering sheaves / pulleys

I don't know where you got the 200lbs from because you haven't taken the mechanical advantage of the quadrant into account. (According to the article 3700lds equates to 46ilb at the wheel)

Did you...
Forum: Construction, Maintenance & Refit 24-11-2018, 23:32
Replies: 47
Views: 7,183
Posted By coopec43
Re: Steering sheaves / pulleys

Well it depends on the size of boat!

On a 43 ft yacht the loads on steering components could be several thousand pounds

Rudder Loads on the Modern Cruiser
To do their jobs, rudders must cope...
Forum: Construction, Maintenance & Refit 24-11-2018, 21:54
Replies: 47
Views: 7,183
Posted By coopec43
Re: Steering sheaves / pulleys

No. It is just yellow paint.
Forum: Construction, Maintenance & Refit 24-11-2018, 21:36
Replies: 47
Views: 7,183
Posted By coopec43
Re: Steering sheaves / pulleys

I am building up my sheaves for a 43ft yacht I am building. I am using 4 in. pulleys but with rope (Dyneema?). Like you I found Edson and Lewmar prices a joke.

I question your decision to use...
Showing results 1 to 20 of 20

 
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