Boat plans

Mystery of the Blue Moon

For my entire 2000 mile cruise around Florida and up the east coast of the US, I was never satisfied with the way the Blue Moons sails were rigged. The staysail, for instance, didnt self-tack without adjustment. The mainsheet was awkward to use. And the mizzen was downright dangerous!

Blue Moon Sails, from left to right: mizzen, main, staysail, jib topsail above the main drawing Tom Gilmer

Being new to gaffers and wooden boats, I blamed myself. I figured I just didnt know how to use the gear properly. But gradually I began to suspect the problem went deeper than that.

And now Im convinced the Blue Moon was rigged all wrong!

For example, lets just look at the worst offender: the mizzen. Referring to the drawing above, the mizzen is the left-most sail -- the one hanging 8 off the Blue Moons stern.

It looks pretty small, right? Just one of the cute little sails that give the Blue Moon its character.

The sail itself is 50 square feet, about the same size as Vintages mainsail. The mast is about 14 tall, the boom 8 long, and the yard 11.

This type of sail is called a standing lug sail, which has a reputation for being powerful and easy to use.

So whats the problem? Check out the mizzen spars, which I have taken off the boat for painting.

Mizzen spars From right to left: Mast (14), Boom (8), Yard (11) photo jalmberg

Notice anything odd? There are virtually no fittings on these spars, except for a couple of small, plastic blocks that have obviously been added fairly recently. There is a 1.5" cheek block at the top of the mast, and a turning block hanging from the boom (not visible in photo.)

Otherwise, the only fittings are the shoulders at the top of the mast, and holes drilled at each end of the boom and yard.

I believe the Blue Moon was built by a builder named Randy Hill down in NC. Ive never met Mr. Hill, though I would love to. I havent been able to track him down, so far. But Mr. Hill knew a thing or two about wooden boats. He knew how to build them strong, and he knew how to rig them simply, without a lot of shiny geegaws screwed into the spars.

But somehow his knowledge was not passed down through all the Blue Moons owners.

Blue Moons Mizzen - click for closer look drawing Tom Gilmer

Someone, at some point, looked at this set of mizzen spars and asked, "How the heck do you hoist up the sail?" and "Where does the dangburn sheet go???"

Lets look at the halyard first. The halyard is the rope used to pull the sail to the top of the mast. To do this, the halyard is led from the cockpit, up through some sort of block at the top of the mast, and down to the top of the sail, where it is tied off. To hoist, you just pull on the loose end of the halyard.

But how was this done before the plastic cheek block was installed?

A mystery.

Next, lets look at the mizzen sheet. You can see from the diagram above that the Blue Moons mizzen sheet is a simple affair. Just a rope attached to the end of the boom, led through a turning block on the boomkin, back up through another turning block on the boom, and into the cockpit. Could not be simpler.

But again, there is no hardware on the boom. No place to tie off the sheet. No turning block. How was the sheet set up before someone screwed a tiny plastic turning block into the boom?

Another mystery.

What is my problem with these small plastic blocks? Simply put, they are unsafe. The two 1.5" screws holding the cheekblock to the top of the mast pulled out in a fairly light wind. Thats how much power this small sail can generate.

And thank King Neptune that they pulled out when they did. Even in a light breeze, it was a heck of a job to pull the yard, sail, and boom, plus a bunch of tangled rope, out of the water and back into the cockpit. Id hate to think what would have happened if it pulled out on a dark night, offshore.

I screwed the cheekblock back into the mast after the first disaster, but never had the nerve to try it again.

There are other problems. Suppose the halyard was set up more securely. What happens when you let the sail down?

Think about it. The only thing holding up the yard, sail, and boom is the halyard. When you slack off on the halyard, the boom drops down onto the boomkin, the sail comes down behind it and starts to drag in the water. Finally the 11 yard comes down, swinging around, uncontrolled, threatening to drag the sail, you, and whoever happens to be hanging onto your feet, down to Davy Jones locker.

Supposing you dont get dragged overboard, how do you get sail ties around all that stuff when its hanging off the back of the boat, out of reach?

Another mystery.

I have some clues: four small holes drilled into the bottom of the boom, and two small footprints in the paint.

Mystery holes drilled into the bottom of the boom photo jalmberg

What were these holes for? I believe there were two pad eyes attached to the bottom of the boom, roughly dividing the boom into thirds.

Pad eyes photo Jamestown Distributors

My first thought was that they were for attaching the end of the sheet and the turning block, but they are in the wrong place for that. The plans show the end of the sheet tied off to the end of the boom, with the turning block close to the middle. But these pad eyes were installed 1/3rd of the distance from either end.

Mizzen boom setup diagram jalmberg

More importantly, I cant see the conservative Mr. Hill depending on four short screws to control all the force generated by the mizzen sail. If he did attach the mizzen sheet to the boom with pad eyes, they would also tend to pull out just when you needed them most. Not the kind of strong and simple construction that he seemed to favor.

So what were those pad eyes for? And how did he hoist and sheet the mizzen without any hardware?

Thats what puzzled me and at least one other Blue Moon owner. But I think Ive finally solved the mystery...

To be continued

>>> Next Episode: Mystery solved!

Helena standing at the bottom of an inlet in Cornwall. The ocean comes back and floats the boats half-hidden behind her. photo jalmberg