Jim Michalak's Boat Designs

1024 Merrill St, Lebanon, IL 62254


A page of boat designs and essays.

(1 August 2017) This issue will set up a rowing boat. We review taped seams in the next issue.

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:

Tom Mannix's crew waits for the captain in her new Mixer.


Contents:

 

Contact info:

jim@jimsboats.com

Jim Michalak
1024 Merrill St,
Lebanon, IL 62254

Send $1 for info on 20 boats.

 

 

Rowboat Setup

I've been showing photos of Max Wawzyniak's Oracle prototype for the past few month. The project was done a while back but we were frozen in until about the first week of March. Then it all burst out then and we had a day in the 70'sF and it was time to launch. That particular day the wind was gusting to 30 and no testing was going to get done but it was a good day to take photos and also to set the boat up in the way I like to see it done.

We went to Washington County lake here in Illinois which is about a mile long and with many arms, steep hills around and a shallow launch ramp in a protected area. A very nice rowing lake.

The first thing I must say to those who are finishing a new rowing boat is to not install the rowlocks in the shop! I usually show a rowlock location on the drawing but that is just my best guess at the time I drew the boat. If you have a little patience you can get it just right the first time by following this essay.

Max unloaded his new Oracle and showed me his gear. He had made a low rowing seat, 3-1/2" high, and had some nice 8' oars. The seat looks low but you will usually have a cushion on top and this is a low sided boat. This seat turned out to be just right for Oracle.

Next the boat was placed in the water tied loosely to the dock. Max climbed in and we looked for the seating position that would provided a level boat.

Here he is too far forward and you can see that the bow is down and the stern is up. I might add that it really takes two people to get this just right - one to be the skipper, and another to watch for the correct trim since seeing the trim from inside the boat can be difficult.

Here he is too far aft. The bow is up and the stern is down:

Here he is with his weight located properly for a level boat. At this time he marked the seat location on the bottom of the boat so he could easily repeat the location in the future.

Sitting in the properly trimmed boat Max holds the oars comfortably and notes where they cross the wale.

At those points he places a large C clamp in position to simulate the rowlocks.

Now for a test row using those C clamps as thole pins. If the clamps are large enough you might pass the oar through the opening or you might tie the oars to the clamps. In this case Max was just careful to keep the oars against the clamps.

At this point you can shift things around. Once you find the best place for the oarlocks, note the position and install the lock sockets. In this case Max used common sockets mounted outside the wale. He screwed them into position for now, to replace the screws with small bolts in the future. (Screws have a bad habit of working loose at the worst time.) Sockets mounted outside the wale instead of inside? They function a lot better outside with no chafing on the wale but if you are using the boat as a tender then inside the wale might be better because there will be no metal to gouge the mothership.

Not quite done yet. A good rowing setup will also have cleats inside the hull against which you can brace your feet. It's not a big deal in calm conditions but for rowing hard, and in some conditions all rowing will be hard, the cleats will make a huge difference in the amount of force you can deliver to the oar.

Max didn't install his on his test day but the cleats can be about 3/4" square and 6" long and mounted in a comfortable position. Many rowing boats will have several cleats spaced maybe 3" apart to allow for different sizes of oarsmen. Here is a photo of the cleat in my old Roar2. It was meant to be a temporary fit and was plopped in place with a blob of Bondo. Still temporary after 12 years!

Perhaps just as good as a cleat is the arrangement that Rob Rohde-Szudy made for his Piccup Pram with a rope loop to the seat that captures a bracing bar that rests on the floor of the boat:

Contents


ORACLE

ORACLE, LIGHT ROWBOAT, 15-1/2' X 45" X 80 POUNDS

Oracle might have been called Roar3. It is a bit longer and lower than Roar2 so it looks sleeker. It is actually closer in shape to my Toto canoe. I'm pretty sure it is a visual improvement over Roar2. Hard to say if it is a practical improvement. Being lower sided it might seem less secure but then again my Roar2 has never taken water over the wale in the ten years I've had it and maybe I've been hauling around excess freeboard. Max Wawrzyniak of St. Louis made the prototype. We rowed our boats side by side on a good day recently. I'd say the Oracle was 1/2 mph faster all around going about 4 mph at cruise and 5+ mph on the gps at full effort. It should float two adults quite nicely.

I'd like to point something about the way I draw the line on many of my boats. I make card models of my designs which help me check the panel expansions and allow me to get a 3D check of the shape. The models are done in the same scale as the blueprint, in this case 1/8 and the model is fairly large. So I knew that Oracle has nice curves all around. But if you look at the end view in the lines drawing you see all straight lines! In a way this is a throwback to the original "instant" boats which had hull panels made from straight saw cuts. It is easy for a designer to make the jump to more flexible shapes, that is hull shapes which can look like about anything you might imagine being made from plywood. Back when I started drawing boats I noticed some of the nicest shapes in 3D had end views made totally of straight line segments. Don't ask me why. Not only does that give a nice shape, the designer's job is simplified. For example, with Oracle I might start by drawing the top view. Then I might sketch in the side view needing nothing more than an idea of what the stem, midsection, and stern will look like. Next I draw the end view which will include those elements connected by straight lines. In normal mechanical drawing it only takes two views to totally define an object. So without even drawing the side view of the boat the shape is defined. It only remains to go back and figure it out and adjust the top view, etc., etc.. Happy is the designer who gets it right the first time through.

Oracle is built with taped seams using four sheets of 1/4" plywood. No jigs, no lofting.

Oracle plans are $20 when ordered direct by mail from me.

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.

We have a Picara finished by Ken Giles, past Mayfly16 master, and into its trials. The hull was built by Vincent Lavender in Massachusetts. There have been other Picaras finished in the past but I never got a sailing report for them...

And the Vole in New York is Garth Battista's of www.breakawaybooks.com, printer of my book and Max's old outboard book and many other fine sports books. Beautiful job! 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. But he has used it extensively on his Bahamas trip towed behind his Cormorant. Sort of like having a compact car towed behind an RV.

And a Deansbox seen in Texas:

Another prototype Twister is well along:

A brave soul has started a Robbsboat. He has a builder's blog at http://tomsrobbsboat.blogspot.com. (OOPS! He found a mistake in the side bevels of bulkhead5, says 20 degrees but should be 10 degrees.) This boat has been sailed and is being tested. He has found the sail area a bit much for his area and is putting in serious reef points.

Herb McLeod in Canada has finished the first OliveOyl and is now testing..

Contents


AN INDEX OF PAST ISSUES

THE WAY BACK ISSUES RETURN!

MANY THANKS TO CANADIAN READER GAETAN JETTE WHO NOT ONLY SAVED THEM FROM THE 1997 BEGINNING BUT ALSO PUT TOGETHER AN EXCELLENT INDEX PAGE TO SORT THEM OUT....

THE WAY BACK ISSUES

15aug16, Taped Seams, Cormorant

1sep16, Butt Joints, Vireo

15sep16, Old Outboards, Philsboat

1oct16, D'Arcy Ballast, Larsboat

15oct16, D'Arcy Ballast 2, Jonsboat

1nov16, D'Arcy Ballast 3, Piccup Pram

1dec16, Sail Area Math, Ladybug

15dec16, D'Arcy Thoughts, Sportdory

1jan17, AF3 Capsize, Normsboat

15jan17, The Weather, Robote

1feb17, Aspect Ratio, Jewelbox Jr

15feb17, Aspect Ratio 2, IMB

1mar17, Normsboat Capsize, AF4Breve

15mar17, Underwater Board Shape, Harmonica

1apr17, Capsize Lesson, RiverRunner

15apr17, Measuring Leeway, Mayfly16

1may17, Scarfing Lumber, Blobster

15may17, Rigging Lugsails, QT Skiff

1jun17, Rowing1, Mayfly14

15jun17, Rend Lake 2017, Mixer

1jul17, Rowing2, Viola14

15jul17, Rowing3, Vamp

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

Puddle Duck Website

Brian builds Roar2

Herb builds AF3

Herb builds RB42

Barry Builds Toto



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