Jim Michalak's Boat Designs
118 E Randall, Lebanon, IL 62254
A page of boat designs and essays.
(15Jan04) This issue will melt some lead for sink weights. The 1Feb04 issue will rerun the lugsail rigging essay.
THE BOOK IS OUT!
BOATBUILDING FOR BEGINNERS (AND BEYOND)is out now, written by me and edited by Garth Battista of Breakaway Books. You might find it at your bookstore. If not check it out at the....
ON LINE CATALOG OF MY PLANS...
...which can now be found at Duckworks Magazine. You order with a shopping cart set up and pay with credit cards or by Paypal. Then Duckworks sends me an email about the order and then I send the plans right from me to you.
Bob Goad's well worn Mobydink, great homemade oars.
Making Sink Weights
WHY SINK WEIGHTS????....
Tidmarsh Major has been plugging away at the prototype Skat for a while now and sent me some fine photos of his method of pouring the lead sink weights in his centerboard and rudder blade. Why do they need sink weights? They are made of wood and will float up a lot if they are not ballasted to stay down.
Right here I need to say that the pivoting leeboards that I design don't seem to need sink weights. When they are all the way down and snugged up a little bit they usually stay put in ordinary sailing. And when they hit something they pop up maybe 70% and will stay up until you haul them down again. I have designed very few centerboard boats, Skat being one of them and don't consider myself to be expert on ballasting them. My Birdwatcher, the last Bolger design I built before trying my own, has I think about 40 pounds of lead in its centerboard.
But pivoting rudders always need lead weights I'm quite sure. Some will be shown with a large wing nut that you are expected to tighten when afloat. That just doesn't work. Once out on the water in a small boat with the sails already up the last thing you want to have to do is lean over the stern to try to get the rudder down and locked.
And if you think that a clever set of lanyards to pull the rudder up and down will be fine you are quite wrong also. I tried that for a couple of years. Here is what happens. You approach a shallow area or beach with rudder held down by a lanyard that you have cleated to somewhere convenient. Your leeboard starts to bump the bottom and rise on its own. You have one hand on the sail's sheet and another on the tiller. Now you rudder starts to bump the bottom but won't swing upward until you release the lanyard which you can't do in spirited conditions because your hands are already quite full. OK, you take a chance and release the sheet and release the rudder and grab that sheet again. Now your rudder blade swings up and trails behind the boat so now you have no rudder! So eventually I weighted my rudders and they bump along the bottom very nicely and swing full down again as soon as they can. None of you are as persistant as gravity!
MELTING THE LEAD...
This is Tidmarsh's setup.
Looks like maybe a plumber's melting stove with a pail of wheel weights on top. I also use wheel weights which I got from my local tire guy. For heat I use the normal campers propane stove. For a pail I use a coffee can with a handle bolted to it. There is a pour hole on mine about half way up the side of the can so I don't have to tip the can all the way to pour the lead and there is little chance of it sloshing over the top by accident. The pour hole is too small to pass the steel clips of the wheel weights (they float nicely on top of the molten lead).
Here is a photo of Tidmarsh's total set up. Lead melting, fan to blow away any fumes, rudder and leeboard near and ready for the pour, and Volkswagen warmed up and ready to go for more wheel weights if needed.
Here is a close up of the holes prepared for the lead pour:
They are clamped to a metal plate the will form the bottom side of the casting form. Note the screws in the corners of the pour holes. The idea is that the lead will flow around the screws and harden, locking the lead solid to the wood. Use nails or screws that won't rust. I might add here that it is also good to bevel the edges of the holes. The lead will flow into the bevels and form flanges that also help to trap the lead.
Now the lead is poured into the holes, slightly overfull to allow for some shrinkage when the lead cools.
That is about it except sometimes shinkage will cause the lead block to loosen. I found I could put the lead over an anvil and whack it with a hammer. That flattens it a tiny bit but expands it at the perimeter, tightening it in the hole. You might have to trim the lead flush with the wood's surface. Lead likes to clog files and sandpaper so I found a rasp is a good start and something like a 20 grit disk gets it down to where you want it.
...we look at rigging a lugsail.
SHANTEUSE, SHANTYBOAT, 16' X 6', 700 POUNDS EMPTY
Shanteuse is a slight enlargment of the mini shanty Harmonica. Shanteuse is 1' wider than Harmonica and has a 3' extension on the stern to allow a small back porch and a motor mount that is totally out of the living area.
There was a Shanteuse built in Florida by Vince SantaMaria a couple of years back but he stretched his to 24' so I couldn't really call that one a Shanteuse. But here is one by Douglas Snelson in Tennessee that looks to be right to the plans so I will call this one the prototype. He sent a bunch of photos:
I've also made Shanteuse a little heftier. I'm thinking this one will weigh about 700 pounds empty where Harmonica comes in at around 400 pounds. I'm not sure if the extra beef is needed because Harmonica seemed totally adequate to me as far as strenght and stiffness go. But the extra size of Shanteuse is probably going to take it out of the compact car tow class. The plywood bill for Shanteuse looks like six sheets of 1/2" plywood and eight sheets of 1/4" plywood. I would not use fancy materials on a boat like this and am reminded of Phil Bolger's warning to never spend a lot of money building a design that was intended to look cheap. I see pine exterior plywood at my local lumberyard selling for $11 or a 3/8" sheet and this entire boat could be built of it. So the plywood bill would be less than $200 and I'm thinking the entire bill less than $500. The pine plywood looks quite good to me, its main drawback being that it doesn't lay very flat.
These boats can be very comfortable to camp in. The interior volume and shape are not unlike the typical pickup camper or the volume in a full sized van. It's not huge, it's cozy. The top has an open slot 28" wide from front to back on centerline. You can close it over with a simple tarp, leave it open in good weather, or rig up a full headroom tarp that covers the entire boat. I've shown lots of windows but the window treatment can be anything you like. You do need to see out. I would be tempted to cover the openings with screen and use clear vynal covers in the rain or cold. For hard windows I think the best material might be the Lucite storm window replacements sold at the lumberyard. Easily worked, strong, and not expensive.
As for operation, these are smooth water boats. So it is best to stay on small waters that never get too rough. On bigger waters you need to watch the weather very carefully. For power I would stick to 5 or 10 hp but I'm very much a chicken about these things.
Plans for Shanteuse are $35.
Some of you may know that in addition to the one buck catalog which now contains 20 "done" boats, I offer another catalog of 20 unbuilt prototypes. The buck catalog has on its last page a list and brief description of the boats currently in the Catalog of Prototypes. That catalog also contains some articles that I wrote for Messing About In Boats and Boatbuilder magazines. The Catalog of Prototypes costs $3. The both together amount to 50 pages for $4, an offer you may have seen in Woodenboat ads. Payment must be in US funds. The banks here won't accept anything else. (I've got a little stash of foreign currency that I can admire but not spend.) I'm way too small for credit cards.
The Texas Ladybug is getting details (Toto in background):
Out West the Picara project gets its bottom. Winter approaches:
The Deep South Skat is getting done:
Another Picara, this one with a 1' stretch in the middle, going together in Arkansas.
AN INDEX OF PAST ISSUES
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Plyboats Demo Download (archived copy)
Brokeboats (archived copy)
Brian builds Roar2 (archived copy)
Herb builds AF3 (archived copy)
Herb builds RB42 (archived copy)
Barry Builds Toto
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