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-   -   Suggestions for a small boat vang (http://www.sailnet.com/forums/gear-maintenance/90112-suggestions-small-boat-vang.html)

pick1e 07-25-2012 12:52 AM

Suggestions for a small boat vang
 
I need a point in the right direction for a vang for my 14' Pintail, 122ft SA. I have no idea where to go to get one, I've never mail ordered sailboat stuff before. This boat wasn't made with one so I'd like something complete with the means of attaching to the mast and boom.

Looking around a little bit I've seen some with a sort of harness that attaches to a pin going through the mast/boom. Is this the best type of retrofit to guarantee strength?

Thanks!

MarkSF 07-25-2012 11:19 AM

Re: Suggestions for a small boat vang
 
They sell the vang parts here :

http://www.apsltd.com/c-1114-traditionalvangs.aspx

On my Wayfarer I used the 4:1 Small boat Vang, which has a proper camcleat instead of those V cleats which I don't like.

To attach to the boom most commonly something like the "RWO Heavy Duty Vang Hardware" here is used, to give you a way to quickly disconnect from the boom :

APS - Boom, Mast and Spar Bails, Straps and Tangs

Then a bail or a padeye goes at the mast.

pick1e 07-25-2012 04:15 PM

Re: Suggestions for a small boat vang
 
Thanks very much, that's what I need. I'll stick with the V cleat though, I don't want to spend too much. I only paid $650 for the boat with trailer :cool:

Next question, how to attach the plate to the mast and the strap to the boom? It doesn't seem like screws in aluminum would be strong enough.

SchockT 07-26-2012 01:36 AM

Re: Suggestions for a small boat vang
 
On a boat your size drilling and tapping stainless machine screws into the mast would be more than strong enough. On many dinghies they just use stainless pop rivets, and even they have enough sheer strength to handle the loads. It is a pretty small sail!

MarkSF 07-26-2012 01:56 AM

Re: Suggestions for a small boat vang
 
"On many dinghies they just use stainless pop rivets, and even they have enough sheer strength to handle the loads"

I don't get why rivets are seen as inferior to drill and tap.

I just bought 2750lb shear high-strength stainless steel 1/4" rivets from McMasterCarr.

McMaster-Carr

That means my new whisker pole ring, with 4 rivets, is held on to the tune of 11,000 lbs. You could just about lift the boat by it, if the standing rigging holds on.

The vang on my 31ft boat is held to the boom by 4 of them, and to the mast by 6 of them. Again, you could lift the boat with it.

pick1e 07-26-2012 02:08 AM

Re: Suggestions for a small boat vang
 
I think pop rivets will be what I'll do. For some reason I was thinking you'd have to insert them from the inside somehow. Been a while since I used pop rivets. Standard stainless pop rivets from the hardware store?

dacap06 07-26-2012 07:17 AM

Re: Suggestions for a small boat vang
 
Mark,

Wow! I never knew you could buy high strength, stainless steel rivets! Thanks for a great tip!

I have always liked the idea of rivets better than screws in aluminum. Unless the threading is coarse, of course, or unless you'll need to remove them later.

I wish I understood stainless steel grading better. Does anyone know the advantage of 8-18 such as those rivets are made of vs 316?

Tom

MarkSF 07-26-2012 12:09 PM

Re: Suggestions for a small boat vang
 
I believe that 316 is more corrosion-resistant, but not quite as strong. I use plenty of lanocote between the rivet and the mast, should help stop any corrosion, galvanic or otherwise.

BTW, if you're dealing with the 1/4" s/s rivets, you'll need a riveter with lots of leverage, like this :


Stumble 07-26-2012 07:18 PM

Re: Suggestions for a small boat vang
 
Quote:

Originally Posted by dacap06 (Post 901428)
I wish I understood stainless steel grading better. Does anyone know the advantage of 8-18 such as those rivets are made of vs 316?

The complexities of metal naming are rediculous... But here is a brief primer.

18/8 and 316 are determined by different standards bodies, so there is not a rule that translates between the different organizations.

Secondly 18/8 and 316 are really a group of alloys, not a specific one. Hey refer to any alloy that has the minimum characteristics demanded, and the maximum demanded. But could vary significantly otherwise.

18/8 refers to a group of alloys that have a minimum of 18% chromium, and 8% nickle.

316 refers to the group of alloys that have A minimum of 16% chromium, 10% nickle, 2% molybdenum.

Both have a host of other requirements, and trace metal allowances but those are the major differences.


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