Jim Michalak's Boat Designs

118 E Randall, Lebanon, IL 62254


A page of boat designs and essays.

(1Jan09)This issue will rerun a knockdown essay. The 15 January issue will continue the topic.

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.

Left:

Duckworks' Sandra Leinweber paddles her new RioGrande on the Rio Grande.

 


Contents:

 

Contact info:

jim@jimsboats.com

Jim Michalak
118 E Randall,
Lebanon, IL 62254

Send $1 for info on 20 boats.

 

 

Contents


Knockdown Recovery

RECAP....

This is a rerun of the 15sep99 issue which featured a capsize test done by Herb McLeod on his then new AF3. I want to keep this one up front because it demonstrates what you need to do when you capsize a sailboat which is not self righting, but rather is self rescuing. That is you can get it back upright and going again if you are properly prepared and if the boat, like AF3, has ample built in flotation or airboxes to keep it floating high on its side as you recover. A few things I'd like to point out. 1) Herb's tests were done in very benign conditions and if you capsize in really bad conditions recovery could be a lot more difficult or impossible. 2) If you tinker with a design such that you remove flotation or airboxes or enlarge hatches or move them off centerline, etc., the recovery system may not work and the boat may swamp to the point where you cannot recover. 3) If you have a design with no flotation or airboxes at all, such as most any traditional open boat, recovery is about impossible because the boat will swamp completely and be unstable even if it doesn't sink.

And now on to our story...

AF3 CAPSIZE RECOVERY...

Herb McLeod has been sending me some great scans and also some results of capsizing his AF3, both intentional and unintentional. Early this summer he wrote:

"Hi Jim:

I now have 14 days of sailing in on the AF3. Alas, no pictures yet of it sailing on the water for the same reason as ever, no one else around to take a picture. Most days I am the only boat on the lake. Had one sail where we traveled 20 miles in one day. We did a 6.5 mile section that day in 1 hour 10 minutes with the small sail (69 square feet) on a beam to broad reach (lots of wind). Also managed to turn the AF3 on its side that same day. The AF3 floated well was easily uprighted, boarded and bailed out. Everything in the cuddy stayed dry and we managed to not lose any of our gear. But that is not what I am writing about....."

That whetted my appetite and I emailed for more info about the capsize.

"I'd like to hear a bit more about the AF3 capsize. In particular: About what angle did it go over?"

"I do not know because we were not sailing it at the time. We were both standing on the cuddy deck fiddeling with the sail in a good blow and it went over real fast. We have regularly sailed the hull at up to 20 degrees of heel and it does not feel unstable although I like it best at 10 degrees of heal. I have an inclinometer on the boat(overkill I know) so I know that the angle of heel is a real measurement not a guess. When sailing I had one puff that almost caused a knockdown because I had accidently cleated the main sheet. What happened is he boat healed over dramatically and the sail depowered enough that equilibrium was reached and I was able to uncleat the sheet in time to prevent a capsize. Unfortuantly I did not look at the inclinometer, but I was busy at the time.

" How did you right the boat? (Did you use the leeboard?)"

"Gord the fellow I was sailing with uprighted the boat while I swam off after our cooler that was quickly blowing away. The water was shallow so he was standing on the bottom. His comment after was that he was amazed at how easily the boat came back up. The second set of plans for the AF3 that I purchased was for Gord as after that experience he was convinced that he wanted to build himself an AF3 this winter. We will see..."

"How did you reboard the boat?"

"I climbed on from the stern. I have a small step on the stern that also doubles as a support for my mast cradle. Iput my hands on the stern deck and placed my foot on the step and climbed on board. I must take a photo of this step and send it to you. With the step it was easy to reboard and I could walk around in the cockpit with the water in it and bail it out. Gord then reboarded over the side, which was much more difficult and his choice not mine."

"What I will have to do the next time I am out sailing will be to dump the boat in deep water while watching the inclinometer and get you an answer. The water should be warm this week as it is again over 30C today. Unreal for us as it is usually cool, no one has air conditioning here. We were at a folk festival today but came home as it was too hot.

At summer's end he wrote:

"Hello Jim:

I was glad that I caught you in the other night. It was good to talk to you after so many emails.

I did get out "sailing" this Sunday. I rolled the AF3 solo both ways in deep water. The AF3 seemed stable to well over 30 degrees and I had the distinct feeling that I could have pushed it back upright until the point was reached that the water started to come over the combing of the cockpit. I had my large sail on the boat at the time of the test (103 square feet, 24-foot mast). Winds were almost non-existent. When it was rolled with the leeboard down in the water righting the boat was an easy task as all I had to do was put light pressure on the board. When the leeboard was up out of the water I "walked" with my hands along the chine log (it makes a good grip) to the leeboard and then pulled on the board to pop the boat upright. The comment from the yacht club spectators on the dock was that it came up too easy. They wanted to see me struggle for a while. When righted the boat had 6" on water in the cockpit against the center bulkhead. I pulled myself on board via the stern. I found it easiest to board directly in the middle of the stern because the boat would tend to wallow with the water in the cockpit if I was off to one side or the other. I found turning the rudder 90 degrees and using it as a hand hold helped to reboard. For those with limited arm strength a step on the rudder or a rope step on the stern near the midline would be a great help for reboarding. My son was taking photos I hope some of them turned out. Also asked another boat to take a few photos while sailing maybe we will get you a picture of the AF3 sailing.

I am now off for a week to Jasper Alberta with my son for some hiking and canoeing.

Herb"

WHAT I THINK IT ALL MEANS....

Herb McLeod seems to be the most energetic and organized person I've met.

The scenery of his sailing lake is certainly picture book beautiful. He has warned me that the mosquitoes don't show in the photos.

The capsize with two men on the cuddy deck is no surprise. The boat was not designed for that. In fact the idea behind the slot top cabin is to do all sail handling from inside the slot. You can do that if the snotter attachment is kept within reach of a person with his feet on the boat's bottom. I suspect the high snotter attachment Herb is using is to gain more sail efficiciency. That is true enough but after having snotter tackles fail in one way or another I learned to keep the them well within reach.

Actually the AF3 capsize seems very similar to my experiences with capsizing my old Jinni. Both boats capsize well before they take water over the side. Jinni had less flotation and I think took on more water. I was able to reboard Jinni over the side. It had lower sides and there seemed to be a trick to rolling over the side just as the boat was rolling upright. Then I had to be very careful to not recapsize the boat because of the sloshing cockpit water. And like AF3, Jinni couldn't quite roll upright until I put some weight on the leeboard. The Jinni had three skid/stiffeners on its bottom which I used as a toehold to regain the capsized boat in the same way that Herb used the AF3 external chines as a finger hold. I may add some similar skids to the AF3 drawings.

Herb looks to have gone through all his tests without disturbing any gear because he had it well stowed. Very important.

NEXT TIME...

...More capsize stuff.

Contents


RioGrande

RioGrande, Kayak, 13' X 30", 60 POUNDS EMPTY

Sandra had been boating in a Toto double paddle canoe and in the larger Imresboat kayak. Both of those were designed for lake work but Sandra was making a lot of river trips and some of the rivers were not that lazy. What she had found was that the shorter open Toto was nimble for running rivers but had swamped in larger river waves on occasion. The larger Imresboat was decked over and never swamped and was long and lean, designed for long straight hitches. But on the rivers the current provided the propulsion and quick maneuvering was at times important. Could a compromise be struck? A Toto with an Imresboat deck?

An easy assignment. RioGrande is essentially a Toto (but slightly narrower) with the Imresboat style deck. I suppose it has the same number of parts as Imresboat. The fore and aft volumes are watertight and there should be no way to sink this thing short of destroying it. (Not to say that you could get back into it easily.) As you might imagine compared to Toto there are now more parts to make and those parts all have weight. So I'm guessing RioGrande will weigh perhaps 60 pounds, maybe more, where my original Toto weighed 45 when built of 1/4" plywood. The Leinweber's have proven you can use 1/8" to build these and it will get holed with a good hit from a river rock - they've proven both parts of that. By the way, small kayaks like RioGrande can't have much capacity. This one displaces 250 pounds and, given its empty weight, if you weigh more than 200 pounds you should look for a larger boat.

As you see in these photos RioGrande has been proven on the Rio Grande. Chuck built two of them, one from wood and another as a foam cored plastic boat. The plastic boat has hard glass/epoxy surfaces and is better at surviving river rock collisions than the wood. No surprise there but don't ask me how he did it. It is a South Texas experiment.

From these photos I gather the boat is loaded deep with supplies and camping gear. That didn't seem to affect it in any practical way but you could not load a Toto this deep safely.

Looks like four sheets of 1/4" plywood, or maybe 1/8" if you are feeling brave. Taped seam construction.

Plans for RioGrande are $25.

Contents


Prototype News

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.

I think David Hahn's Out West Picara is the winner of the Picara race. Shown here on its first sail except there was no wind. Hopefully more later. (Not sure if a polytarp sail is suitable for a boat this heavy.

Here is a Musicbox2 I heard about through the grapevine.

This is Ted Arkey's Jukebox2 down in Sydney. Shown with the "ketchooner" rig, featuring his own polytarp sails, that is shown on the plans. Should have a sailing report soon.

And the Vole in New York is Garth Batista's of www.breakawaybooks.com, printer of my book and Max's book and many other fine sports books. Boat is done, shown here off Cape Cod with mothership Cormorant in background, Garth's girls are one year older. Beautiful job! I think Garth is using a small lug rig for sail, not the sharpie sprit sail shown on the plans, so I will continue to carry the design as a prototype boat.

And a new Down Under Blobster is off cruising under outboard power as it waits for its sailrig.

A view of the Caroline prototype showing a lot of the inside, crew on fore deck. Beautiful color:

And here is another making I think its maider voyage in the Texas 200. (I'm told the Chinese rig will be replaced by the blueprint rig.)

I gotta tell you that on the Caroline bilge panels I made an error in layout and they are about 1" too narrow in places on the prototype plans. I have them corrected but it always pays, even with a proven design, to cut those oversized and check for fit before final cutting.

And a Deansbox seen in Texas:

And in Texas Gordo Barcom has completed the first Laguna and I hope to give a full report soon. Here he blasts along on his first flight:

A Twister goes together in good shape:

Contents


AN INDEX OF PAST ISSUES

THE WAY BACK ISSUE ARCHIVES

15jan09, Aspect Ratio 1, JB Jr

1feb09, Aspect Ratio 2, Mayfly16

15feb09, IMB Capsize, IMB

1mar09, Mizzens, Blobster

15mar09, Lugsail Rigging, Imresboat

1apr09, Laguna, Frolic2

15apr09, Rigging Sharpie Sprits, Sportdory

1may09, Small Boat Rudders, Robbsboat

15may09, Rowing Gear, Roar2

1jun09, A Bimini Boot, Ozarkian

15jun09, Phil Bolger, Vector

1jul09, Rend Lake 2009, Fatcat2

15jul09, Rowboat Setup, Mikesboat

1aug09, Sail Area Math, Family Skiff

15aug09, Beach Designs, Cormorant

1sep09, Taped Seams, Trilars

15sep09, Birdwatcher Cabins, Philsboat

1oct09, Bevels, Larsboat

15oct09, Transom Height, Jonsboat

1nov09, Ballast Again, Piccup Pram

15nov09, Ballast Again2, Caprice

1dec09, Weight Problems, AF4Casa

15dec09, Ballast Again3, Raider

SOME LINKS

Mother of All Boat Links

Cheap Pages

Duckworks Magazine

The Boatbuilding Community

Kilburn's Power Skiff

Bruce Builds Roar

Dave Carnell

Rich builds AF2

JB Builds AF4

JB Builds Sportdory

Hullform Download

Plyboats Demo Download

Brokeboats

Brian builds Roar2

Herb builds AF3

Herb builds RB42

Barry Builds Toto



Table of Contents