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Forums / Technical / Mast and Boom Sections  
The discussions for this thread include the following:

Posted: 23 Dec 2008 at 6:42pm
Does anyone know what the original-equipment mast and boom sections were on the Yankee Dolphin circa 1969?

I have to replace the boom gooseneck fitting, which is cracked. I'm pretty sure the boom and gooseneck are original, and the boom sure looks something like a Kenyon "D", but before I order the wrong part I thought I'd give a shout out to the Dolphin community.

Anyone know??
Erik Evens
Los Angeles, CA
"Robin Lee", Yankee Dolphin #118

Posted: 27 Dec 2008 at 12:58pm
Hi Erik
I hope we get some replies here on this subject. There is a new page up in the Technical section on new masts with more to come. Also check out the article on broken gooseneck fittings
Marionette #12

Posted: 29 Dec 2008 at 8:41am
Hi Erik
I should have answered this earlier. Marionette's boom section is also the same as the Kenyon D.
3 3/4 x 2 1/4. Dwyer has it on their website as DM375. My experience with my boom over 12 years is that it works. It does bend a little in a breeze. The potential failure I worry about (the classic failure point in booms) is where the ss vang fitting rubs on the bottom of the boom. There is a small abrasion groove there which I cover with a layer of duck tape and then a layer of adhesive backed ss tape - the stuff used on heating duct joints.

I am working on a new aluminum boom for Passage. When we got her she had, and still has, the original wood boom. What the 'original equipment' was on these boats probably varied a lot.

Shortly, I will have a new page up on booms in the Technical Section on the website

Marionette #12
and Passage, #10

Posted: 29 Dec 2008 at 11:35am
Thanks Ron!

I spent yesterday working on the Dolphin, and among other projects, I took the boom apart and examined, cleaned and lubricated the clew-end fitting and the gooseneck. I mounted a new cleat for the outhaul, replaced the internal outhaul line (the one that was there was old and worn and too large OD and difficult to make fast to the cleat). Then I reassembled all and fashioned a clew attachment that will work with my broken gooseneck fitting until I can replace it. So I guess I'll keep what I have until I replace the entire boom. I'll probably do that once I have all the rigging bits just where I want them...the existing boom thus serves as a full-size mock-up.

My boom flexes as well when the wind is up, and it has a bit of a permanent bend in it, the crown of which is the boom-vang attachment point. I think that I'd go with a slightly deeper section if I were to replace it.

Put on my new JSI sails yesterday. They look very good as far as I can tell, from dockside. All the dimensions seem perfect, and the detailing and workmanship are first-rate. No time for a sail yesterday, but I'm planning for an afternoon jaunt today. I'll report in after I've checked them out.

Erik Evens
Los Angeles, CA
"Robin Lee", Yankee Dolphin #118

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