WebLetter 39An Occasional Publication for the Home Boat BuilderGlen-L Marine Designs - 9152 Rosecrans Ave. - Bellflower, CA 90706 In this issue
GLEN-L Update
Barry Witt Mississippi River
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Designer's Notebook: Conventional plywood or Stitch and Glue construction?Plywood boats are commonly built by two methods, conventional and Stitch and Glue. Conventional plywood boatbuilding has been used since plywood became practical for boat use. It's a modification of the methods used for the old conventional planked boats that seem to last forever. Stitch and Glue, although most think it is new, has been around quite some time. Its popularity, however, really took hold when the marine epoxies were developed. Both conventional and Stitch and Glue building methods are reviewed under the listings Boatbuilding Methods on the GLEN-L website. What's the best method? It depends on the type of boat, not all boats are practical for Stitch and Glue (S&G) construction; the method is impractical for hulls designed for cold-mold or diagonal plywood strips. Our plans utilize S&G methods for many small boats using sheet plywood. The contours of the planking are given, so you don't need to determine the shape from marking it out from a framed boat as would be required for conventional building. S&G eliminates fairing, a task that most builders find confusing, though, after a little experience it isn't really much of a problem. S&G is popular with first time builders as a boat is formed very quickly after the parts are cut out. This boosts confidence and stimulates the itch to do more. Some don't like the fact that applying the epoxies and taping seams is a smelly, messy project; and epoxies can be toxic for some. Although epoxies are currently used on S&G and conventional plywood boatbuilding glue bonding, it's not as extensive as the glue, fillets, and fiberglass reinforcements of S&G boats. Cost to build is predominate in most builders minds. At first glance, S&G seems to be more expensive and it possibly is, by a little. Many check the GLEN-L "Stitch and Glue Kits", see the price and blanche. But such a kit provides the fastenings and bolts, the "FASTENING KIT" used on conventional construction plus any bolts required. Also included is epoxy to use as a coating, with or without additives (furnished) for gluing or forming fillets; you can even make fillers for patching screw holes or other minor imperfections. Fiberglass laminates to bond the seams and copper wire to "stitch" the seam together, even the tools for application, rollers, squeegee, and brushes are included. S&G eliminates much of the solid wood, frames and longitudinals typical of conventional methods. Even the stem, the long curved wooden section at the bow, is eliminated in most GLEN-L S&G plans. Subtract the items not needed in S&G and the costs to build come quite close. It is possible to take shortcuts on conventionally built boats that are not desirable for S&G methods. Glues can be substituted for epoxy and encapsulation can be eliminated. Cheaper fasteners used and fiberglassing eliminated or polyester resin used. On smaller "throw away" boats, this may be satisfactory but in the long run comparing the two methods on equal terms is the only fair way. Durability? Either conventional or S&G methods have excellent life, particularly when epoxy encapsulated. Dry rot will always be a problem if rainwater collects in the bilge. Epoxy inhibits this but over a period of time under soggy conditions the wood can rot. Obviously, keep the bilge dry and most of the possible problems are eliminated. |
Progress on daboat has been better than progress on the website... So I figured it was time to revamp the site and add the latest pictures. There is a link below.
The latest launch date looks like October or November.
I haven't looked at these older pictures in a long while and had forgotten how much work I have done. The big jobs are finished...
Check it out. www.daboat.com
John Higgins
Poxy-Shield The boatbuilder's epoxy the best product for your project |
We received a letter from Ken Johnson who recently completed the Cracker Box, "built as a gentleman's racer". Since we frequently have questions about giving "my boat a classic wood look", I have added links to a few other projects from our Customer Photos section that have been given a classic wood appearance. Perhaps they will give other builders an idea of the possibilities.
Malahini by Jeff Pierce - Jeff is using wood veneer over the hull plywood.Cracker Box by Ken
Johnson
Malahini by Tom Lynch -
Tom is also using wood veneer over the hull plywood.
Monaco by Bill
Yonescu
Overniter by Owe
Pedersen
Rebel by Dominik
Papas
All of the Rivieras
Ski Tow by Greg
Squirt by Ron Shady
Squirt by Dan
Schmock
Squirt by Carst R.
Kok
Tiny Might by Michael
Sabin
Zip by Doug Hodder
For really good information on applying veneer see Mark Bronkalla's site.
Also his comments on the Boatbuilder Connection.
Subject: How Fast? Tiny Titan does 32 mph
Date: 9-11-02
My Tiny Titan goes 32mph using a stock 1998 15HP Evinrude and alum.
three-blade 9.5X12.5 prop on a full 6 gal tank. I weigh 165LBs. The boat is
heavy, with 1/4 in. decking, solid 3/4 in. fir frames, a seat and trim. The
cavitation plate runs 3/4 inch above the surface, motor is on the third
notch.
Many first-time drivers have run my boat successfully (on the second notch). A
20HP would be too much for beginners. Alf Marshall
Subject: glen-l website
Date: Sun, 01 Sep 2002 19:15:44 -0400
Just writing to say how impressed I am with your website. I'm new on
line (but have played with computers for a long time), and yours is the first
site I've visited that is easy to use and get around in.
By the way, your photo of Mr. Melvin's Cabin Skiff looked awfully
familiar. That looks like Wood Duck, I thought. The next photo was a different
view of the same boat - and sure enough, it's Wood Duck. He keeps the boat
at the marina here, for part of the year, at least. It's been here for two
or three years. Again, I was impressed by your website. I hope others check it
out & learn something.
Paul Cross
Drummond Island, MI
Subject: La Chatte Built in 1976
Date: Fri, 30 Aug 2002 14:21:20 EDT
I built this boat along with my father and brother when I was 16 in 1976. Over the course of time, we modified the rigging to accomodate a Hobie Cat mast and sails which adapted quite well and added more speed to the boat. I am delighted to find after all these years that you still use the "La Chatte" design which was an extremely fast sailboat in a good wind off the coast of Plymouth, Mass where the Mayflower once sailed.
Hope you add this to your site, thanks, Mark Crociati
Subject: Minimaxed motor? Date: Fri, 30 Aug 2002 14:08:57 -0400
Hi - Just posted this and wondered if you had any advice on the Minimaxed 5HP power recommendation....
Our family had an original (SeaFlea) from 1963 until about 1990 when it finally had more patches than original material. Something surprised me on the new plans though - the 5HP motor recommendation. We ran ours (albeit orginal construction - not S & G: with either a racing 7.5 or a 9.5 and it was perfectly stable. In fact, I'm sure the orginal plans allowed for up to 18HP (!! - yes, that's eighteen).
Corey
Answer:
The original MiniMax would be allowed only 5hp under the current US Boating and
Safety act. The act includes a formula that uses dimensions of the boat to
determine hp. WE cannot recommend more, but many builders use more than the
recommended power. The MiniMaxed will be at least as stable as the
original.
Subject: Scrapers
Date: Thu, 29 Aug 2002 17:18:17 -0700
I read your article about the use of Cabinet Scrapers for boat building. I
ordered some scrapers over the Internet. (Mark
Bronkalla's article in WebLetter
36)
They arrived today. The sharpening shop did not know how to put burrs on them.
As I started to do it myself, I felt a burr on one of them. Of three scrapers,
one was ready to use. The others were not.
I used it on the flat part of the epoxied middle seat. It was much faster than
sanding, and it produced a better finish than sanding does. It took only one
stroke to learn how to use it.
Thanks for the tip!
Larry
Below is the result of your feedback form. It was submitted on Wednesday,
August 28, 2002 at 16:23:52
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name: Philip Crusco
Comments: Late last year I dusted off a copy of Boat Builder from 1973. My 12 year old son became very interested in the Minimax. After a quick internet search we purchased plans and a steering kit and fiberglass kit. Well, my son Anthony and I have just finished the Minimaxed. It was a lesson in patience and overcoming obstacles but I wouldn't trade it for anything. We bonded during this construction project. For your information this is my second Minimax. My father and I constructed a Minimax from your plans and patterns in 1973. All that I need to do is locate a Keller Throttle and we are on the water.
I would recommend this project as a way to help young people work as a team and to learn how to organize and plan your time. Glad you were still there to provide the chance for another generation to build another Minimax.
Subject: Cabin Skiff
Date: Sat, 24 Aug 2002 16:56:39 -0700
From: E T ANDREWS
Hi Guys,
Well, I am finished, for now, with my Cabin Skiff. It has been a great
experience for both myself and my family. Now I can enjoy it. Please check it
out at www.seaputter.com. I would love
to be in your news letter.
Subject: VIRUS IN YOUR MAIL
Date: Sun, 25 Aug 2002 14:04:39 -0500
From: postmaster@mail2.ruraltel.net
----------------------------------------------------------
V I R U S A L E R T
from
N E X - T E C H
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Our viruschecker found the
'Worm/Klez.E'
'Worm/Klez.E'
Although we did a virus check specifically for the Klez virus and came up with nothing, I was worried that we might be still sending the virus (we have had the Klez virus in the past) or that someone else was somehow using the Glen-L site to send email with virus attached. I emailed the experts to ask about it and got the following reply:
"The way Klez works is that it randomly takes any hostname found on the infected machine. This means it could originate from a machine that has sent you an email, or even browsed your site. Looking at the error message you included, it appears to have originated from an aol user, not from your server."
You can get your computer scanned for the Klez virus for free at http://www.trendmicro.com/free_tools/. Note: When we last had the Klez virus, we used Norton utilities with current virus files, it did not prevent our getting it and was not able to detect it, even after downloading the latest virus files. The above site found it and deleted it.
Subject: Ocala Tubby Tug Photos Date: Sat, 24 Aug 2002 20:27:40 EDT
24 August 2002. Attached are photos of the Tubby Tug, "Puddle Jumper" on the Silver River. I weigh 180 lbs and I could not flip this boat with my weight from any angle. Great design!
Subject: Tiny Titan photos
Date: Fri, 23 Aug 2002 10:44:00 -0400
Hi,
This Tiny Titan hydro was built in 1966 ( I was 13 at the time). Here are some photos that you may be interested in - still looks good today!
Regards,
Jim Lajewski
Subject: Re: Order
Date: Fri, 16 Aug 2002 10:38:50 -0500
Thanks Gayle. Should get it any day. I appreciate you getting that information for me. I do wish you folks had more material we could use on the boat*. Your service is exceptional and your prices are reasonable and you, by the way, are one of the most responsive and pleasant people I've dealt with in a long time. You are what makes Glen-L Marine Designs successful and it's a pleasure doing business with you.
Sincerely,
David Lefebvre
*Ok, what other products would you like us to offer? - Gayle