Bronze padeye for Boom Vang?

[William Jarrell]

I have a '76 CD25. I was planning to mount a boom vang with a bail and padeye. I was wondering if a bronze padeye would have the tensile strength.

Also what ratio do you recommend? 3:1 or 4:1

Thanks in advance

Bill



billjarr@mint.net

[D. Stump, Hanalei]

Bill,

Here's what I did...Look at your sail track, buy a stainless steel U-bolt that will fit into the track, probably 1/4" would do just fine. Measure how far up on the mast the mast step will be when the mast is in place(about 2" if I remember right) Drill two holes inside the track to mount the U-bolt, put a backing plate on the studs of the U-bolt inside the mast, and double nut the U-bolt in place. You are done, and now have a very secure place to hook the lower fitting on you vang. Just remember, the bolts inside the mast need to be high enough to clear the step. You don't need a bail, you don't need a deck fitting, a simple U-bolt will do just fine.

Do NOT use bronze for this application - too much force, it would create a safety hazard. FWIW....

Dave Stump
Hanalei

[Anthony P. Jeske]

Bill:
I have a sheet that was prepared by Spartan showing the bail sizes and mounting locations for boom vangs for all Cape Dorys. If you'd like a copy, I can snail mail or fax one to you. I'd be happy to send one to any one else who wants one, also.
God Luck,
Tony Jeske
CD 25-D #141
Carpe Diem
San Diego



ajeske@ixpres.com

[Neil GOrdon]

>>Also what ratio do you recommend? 3:1 or 4:1<<

Either will work for the vang. I'd go for 4:1, as the tackle can be used for all sorts of things... like recovering someone who's overboard, etc.


Regards, Neil
s/v LIQUIDITY
Cape Dory 28 #167



cdory28@aol.com

[M. R. Bober]

I would strongly suggest that you NOT put a bronze fitting in direct contact with your fine aluminum spar. There will be galvanic corrosion. When I installed the vang on TIA MARI, I used bails on both the mast & the boom (obtained from Spartan, who also included mounting instructions).

I would suggest 4:1.
Mitchell Bober
RESPITE
CD330

[Bristol Bronze]

I have a '76 CD25. I was planning to mount a boom vang with a bail and padeye. I was wondering if a bronze padeye would have the tensile strength.

Also what ratio do you recommend? 3:1 or 4:1

Thanks in advance

Bill

Dear Bill,

To answer your question, a Bronze pad eye would be plenty strong enough depending on the alloy of Bronze. All too often the "Mega-marine Stores" are selling brass under the name of "Bronze". Worse yet their fittings are usually in a high zinc, high lead brass that is made in Asia.

The common grades of stainless steel (Type 304 & 316) are stronger than the common grade of Bronze (Silicon Bronze). There are, however, alloys of Bronze that will put stainless steel to shame from the strength point of veiw.

All of this is academic from your point of view. You should never ever fasten any copper base alloy (brass or Bronze) to anything made from aluminum. Copper and its various family of metals is much higher on the galvanic scale of metals than aluminum. By attaching the two metals you will turn the aluminum into a sacrificail anode and it will disappear in no time at all. In your situation you will have to live with stainless steel and the bleeding rust that is sure to follow. I really wouldn't want to have the rusting stainless steel that close to the easily stainable sails on my boat but since you have an aluminum mast on your boat you don't have much choice. Stainless steel is higher on the galvanic scale than aluminum but they are not too far apart and will live together much better than a copper base alloy and aluminum.

If you have any questions I can be reached at 401-625-5224.

Roger W.
Bristol Bronze



info@bristolbronze.com

[Michael Wainfeld]

You may not have to drill the mast. With a regular stainless padeye you can slide 2 washers and nylock nuts down the sailtrack and tighten the bolts. I'm not certain this is strong enough for a 25, but its plenty strong for a Typhoon. Check it out. You can see my arrangement on www.geocities.com/Regalo82
Mike Wainfeld



wainfeld@optonline.net