WebLetter 12
An Occasional Publication for the Home Boat Builder
Glen-L Marine Designs - 9152 Rosecrans Ave. - Bellflower, CA
90706
In this issue
Glen-L Update
Website:
- Visitors to our site comment on how much they like it. But we can't do
it alone. We depend on your input: in the Project Registry, the Customer Photos
pages, and articles for the Web Letter. There is much talk on the internet
about "community", we would like to be a part of your boatbuilding
community by providing a place for dialog. Each morning when we open the email
we hope for an article or new entries for the Project Registry. If you think
boatbuilding is a worthwhile endeavor, won't you contribute? Add your
project or answer queries on the Boatbuilder Connection. Other builders are
intersted in what you have to say.
- If you read the last WebLetter, you know that I invited builders to send
photos of their boats in "exotic" locations (family and boat on
vacation). No response...
- Missile... I received two photos of the Missile, a boat that is no longer
in the catalog but that was one of our most popular boats in the 50's.
Unfortunately, I lost the email (or letter?) that came with them, so I
don't know who sent them. I've searched my browser "Trash"
and "Sent" folders but found nothing. If you sent these photos,
please let me know. I plan to add a Missile page to the web site and would like
to use your photos.
- We edited the Boatbuilder Connection again, filing useful information in
the archives. Check the archives for questions and answers on specific Glen-L
designs. There is a lot of good information concerning performance and other
topics.
- In the "unfinished business" category: Work has stopped on the
PowerYak test model because of increased demand for frame kits. I would like to
say we are going to start again within a month, but...
The Fife was featured in the last issue of "Boatbuilder" magazine.
Many of you have asked whether I have yet run the Fife with an electric motor
until the battery ran out, and how long it ran; well, no I haven't. But
it's on the list.
Barry Witt
Editor
Inboard Motor Installation: Angles & Layouts
In response to questions concerning "how to
determine shaft angle", "...distance of the propeller from the
rudder", "...distance from bottom of the boat to propeller", we
are re-printing Chapter 11 from our book INBOARD MOTOR
INSTALLATIONS.
CHAPTER 11
Shaft Angles & Layouts
The layout for a straight shaft inboard
installation requires consideration of several variables. With the many
variations possible in the size, power, and weight of the motor, this will also
cause a variation in the size of propeller that can be used. This in turn can
alter the strut angle and drop, and position of the hole in the boat for the
shaft. As can be seen, a change in one element can lead to a change in another
part of the procedure, with many variations possible in the same boat. To fix
things in order to provide a starting point, it is therefore essential that the
diameter of the propeller to be used be known, along with the specific motor,
in order to determine the shaft angle and the shaft hole position.
The proper way to determine the accurate position
of the various units that constitute the inboard motor installation is to make
a full size layout, or a physical substitution or "mockup" of the
entire propulsive system. This is the point where many individuals will throw
up their hands in despair and shout, "I ain't no blankety-blank
engineer or draftsman. How in blue blazes do you expect me to understand this
kind of nonsense? The heck with this business, I'll do it my way".
This type of person then goes out and punches a hole in the bottom of the boat
at some point where he thinks that it "looks right", and hopes that
the motor will fit close to the point where the designer intended it to be. The
chances are that he will be WRONG and the boat may turn out to perform in any
manner except the RIGHT one. The layout does take time, BUT it is not
complicated. If a person feels he can install an engine, he should be able to
make a layout as well. So the advice is to stick to it and follow through the
procedures a step at a time by following the text and illustrations
provided.
Continued
New - Epoxy Manual on-line
For a quick source of information about our
POXY-SHIELD and POXY-GRIP epoxy resins, visit our new "EPOXY" pages.
Learn how to handle epoxies safely, mixing procedures, various uses for epoxy,
and much more.
Epoxies are considered indispensable for
boatbuilding by many builders.
- What will it do?
- What fillers should I use?
- How can I control working times?
You may order our $2 "Epoxy Manual" or read it on line.
For the RAG MAN
About sail boats & sailing...
Weather Helm
Most sail boat people agree that a slight weather
helm is desirable in a sailboat. Exactly how much is a "slight"
amount is at times difficult to explain. In fact, we'd better get a basic
explanation of just what this "weather helm" is.
A boat has a weather helm when it tends to head
into the wind when the tiller is released. Small boats may well have a slight
lee helm (the opposite of weather helm or a boat that will head away from the
wind when the tiller is released) in very light airs. A properly set up craft,
however, will tend to head into the wind when a gust comes or with strong
airs.
When you first launch your sailboat, it is very
possible that adjustments will need to be made to bring the hull into the
proper balance. This can be accomplished by shifting the passenger weights fore
or aft, increasing or decreasing the rake or position of the mast or adjusting
the belly in the sail.
First of all, suppose the boat has quite a weather
helm. That is, it tends to head into the wind too strongly. The cure would be
to do one or more of the following depending on the severity of the condition.
(1) Decrease the rake of the mast or step the mast farther forward. (2) Shift
the crew farther aft. (3) Pull up the centerboard partly. (4) Decrease the
belly in the mainsail.
If the boat has a lee helm or tends to go away from
the wind, the solution is the reverse of that for a weather helm. Thus, to
correct for lee helm (A) Increase the rake of the mast. (B) Shift the crew
farther forward. (C) Let the centerboard down to its extreme position. (D)
Increase the belly in the mainsail.
From the above it is apparent by careful tuning the
sailboat can be made to have any degree of helm within a reasonable range by a
series or possibly only one adjustment. Trying various adjustments will enable
the sailor to trim his boat not only to his own desires, but also for best
performance.
...glw
Builder Feedback: Utility
Subject: Utility Update
Date: Sat, 26 Jun 1999 18:52:19 -0400
From: Tom Rosling
Just read your newsletter and thought that I would send an update on the
Utility boat project.
I initially had a 9.8hp Nissan engine on the boat but with the combination
of my weight (215) and the seating dictated by a tiller I had a bit of a
problem getting the boat up on plane. I have ordered a 25hp Nissan from Browns
Outboard (outboard@bellsouth.net). Dennis has really worked with me to get the
correct engine and controls at a great price.
Since I was going to a steering wheel on frame two I decided I needed a
windshield. I started by cutting a couple of foam blocks to shape for the
brackets. I covered them with epoxy-glass and then dissolved the blocks with
acetone. I then made some wooden bases to match the curve of the deck and used
epoxy and screws to attach the fiberglass. I attached 1/8"x1 1/2"
aluminum strips to the leading edge of the fiberglass for windshield anchors.
The center support was cut from 3/4" yellow pine. I used 1/4" ply to
form a template for the lexan windshield and cut plastic to shape with a
scoring knife. The windshield was attached to the brackets with 1/4" ss
bolts and acorn nuts. It came out pretty fair. Gives the boat that 1950 look I
wanted.
I'll send you pics of the entire update when I get it completed.
Thanks for your help
Tom Rosling (tom.jo@worldnet.att.net)
Date: Fri, 23 Jul 1999 20:53:44 -0400
Last spring when I sent in a photo of my boat, you
asked that I write up how the project went and any details I thought might be
of interest. So, here it is.
In Aug 1998 I ordered a set of plans for the
11' Utility design. I had decided I needed a small fishing boat I could put
over by myself. I also had a 10hp engine that was the right size, according to
the plans. I ordered the bronze fastening kit and 1/2 gal of epoxy. I guess
that I built too heavy because I needed another 1/2 gal of epoxy and another 2
gross of 1 1/2" #8 screws (I found that the screws you use on house decks
were a cheap source of 1 1/2" stainless steel screws. They will break, so
use them where you're not depending on the screw for much strength). I used
ground fiberglass in all joints.
For the scarf joints, I built a large table and
nailed/clamped the wood with a 12:1 overlap and planed the joint with a
motorized hand plane and a final sanding. The frames and jig built up quickly.
The chine curve at the bow gave me the most trouble. If the curve at the bow
were slightly more gentle and matched the curve from frame 2 to the bow it
would simplify bending. Builders may want to look at this before they get
locked in. The only other problem I had was fitting the sheers to the frames.
You might want to cut some small blocks the final thickness of the sheers and
use them for checking the notches in the frames.
When the hull was completed, I covered it with
polester resin and fiberglass. I have built a lot of boats and the polyester is
very durable. Epoxy has some advantages but the cost is higher. I sealed all
the wood inside the hull with polyester resin, as I have done on all the wooden
hulls I have built over the last 14 years.* I added a
strip of 1/4 ply from the aft edge of the bow to the transom. It smoothed the
look of the sheers. The hull I varnished walnut and the deck, pecan, using
colored Minwax polyurethane. It worked out very well. Trim is polyurethane. I
took about 6mo, to reach this point. With an extra pair of hands now and then
it would have been quicker.
I mounted a 10hp motor I had bought as a backup for
my Renkin 17' Classic. I also put on a downtroller, a fish finder and a
folding bracket for an electric trolling motor (and a big deep cycle battery)
for my 2hp Johnson. Here is a picture of the boat as it looked then.
My weight and the driver's position dictated by
the tiller on the 10hp, combined with the extra gear I wanted to carry,
prevented the hull from easily getting up on plane. As a result, I decided to
put on a 25 hp. It turned out to be a good choice. However, I did have to make
some changes to the boat.
I decided that I needed an electric start engine
with remote engine controls so I could move my weight forward. I also designed
and built a windshield to keep any water that comes over the bow, out of my lap
(see details in the Builders Registry section). I had to splice in a section on
the starboard side of the dash (frame 2) to be able to mount the steering
wheel. The lower edge of the original dash was curved on both sides and the
area where the wheel was to fit was too narrow for the steering hardware. I
built a bracket at the rail, to mount the remote engine controls. I moved my
fishfinder to the dash and mounted a speedometer. Since there was not enough
material in the dash to accept a hole the size of the speedometer, I mounted it
in a hand made wooden bezel on the dash. The trolling battery I mounted under
the port side of the drivers seat. As a result, I had to rewire the boat. I
also added an aluminum strip under the bow to minimize wear and tear when I
beach her.
The boat performs very nicely and does not feel
overpowered or too heavy. It accelerates smoothly (read quick like a bunny) and
comes up on plane at about 12 kts. The engine is not broken in so I haven't
tried top end. It does pop right up to about 30 kts. The hull turns very
smoothly and is a joy. It is, however, not a deep vee and the ride can feel
like being pulled off the curb while sitting in a wooden box or driving a late
50's Corvette down a dirt road. If you're looking for a boat that's
easy to build and a joy to run, you may like the Utility. I like mine. To save
two thousand words here are a couple of pictures of the "CLASS OF
'51".
Thanks for your Help. Tom Rosling tom.jo@worldnet.att.net
* We will not agrue with success, but our experience
using polyester resin as a coating has not been as successful as Tom's. We
have found that it has tended to crack when used as a coating without
fiberglass cloth. How about some feedback from other builders?
...brw
Book review: Howard I. Chapelle
This is not a review of a specific book, but of a
specific man, Howard I. Chapelle (1901-1975). The following is from the dust
cover of the latest edition of Yacht designing and
Planning.
Howard Chapelle spent his childhood around the harbor of New Haven,
Connecticut, where he sailed a traditional New Haven Sharpie and began his
career. As a young man he worked for the best boat and yacht designers of the
time and moved on to become a widely esteemed designer and professional naval
architect. Chapelle traveled extensively, working and studying abroad, first to
England's National Maritime Museum, then to Turkey to study their fisheries
and vessels for the United Nations, and later working within the New Maritime
Museum in Singapore. In the United States, he was appointed curator of the
Museum of Transportation at the Smithsonian Institution and was for many years
senior historian there. During his career, he authored an array of classic
books on American small crafts, yacht designing, maritime history, and
traditional vessels.
We have three of his books in our Boatbuilding
Books pages: American Small Sailing Craft, Boatbuilding, and Yacht Designing and
Planning.
Howard Chapelle wrote about subjects he knew well
and obviously loved. If you are interested in the history of boatbuilding, as
well as how-to of traditional construction, his books make great reading. I
particularly like American Small Sailing Craft, which
discusses the development of the various types of traditional sailing boats
from European and even American Indian roots.
Recent email:
Subject: (no subject)
Date: Wed, 7 Jul 1999 00:27:23 EDT
To: info@glen-l.com
Hi my name is Gary Nichols, in 1960 when I was 19 years old I built the Glen
L 13ft tuffy. It was nice to see your name on the internet after 42 years it
brought back a lot of old memories. It is good to see your still in business at
my age of 58 I have told a friend about you and he is planing to order a kit.
He has seen the picture of the boat I built and was impressed. Keep up the good
work.
Gary
Subject: Sissy Do
Date: Mon, 19 Jul 1999 13:11:58 EDT
To: info@glen-l.com
Hi
My name is dave, i built your sissy do boat back when i was fourteen. That
vessel did many things for me, it allowed me to expand my horizons. All the
chines and sheers i cut with a black and decker sabre saw. I was fourteen at
the time and couldn't use a circluar saw, but my cuts were percise. My dad
and I built her over the week of easter break from school. Well, i went on to
form the first Junior BASS sanctioned BASS Club in the state of MD with the
help of Ken Penrod who know runs life outdoors unlimited.
The story behind the vessel is long, it served me from 1982 until in 1996
when i broke it up and took it to the dump, it just could not keep up with my
bass boat!!! i am now going to order plans for its little brother the IMP, to
replace my beer can john boat and has higher horse power rating with much
better safety built in, i do swear by glen-l designs... nothing but the
best!
Thanks for listening
David Robinson
You list the max engine size for the Tunnel Mite as 100 lbs. Normally,
engine max is rated in horsepower. What is the maximum horsepower for this
craft? Is this a stitch-and-glue? When driving the boat, is it a seated or
kneeling position? Thanks for your time. John Z.
ANSWER: On the Tunnel Mite test model we used a 20 hp motor for
approx 35 mph. Engine hp ratings are determined by a formula in the US Boating
and Safety Act. This formula results in extremely low hp for small hydros and
tunnel hulls, so weight is given instead. The Tunnel Mite is not stitch and
glue.
You kneel when driving Tunnel Mite or the hydros.
--
Barry,
Customer Service
name: mike eaton
City: oshaw
State: on
Country: canada
Comments: ...i once built an 8 ball. i took it out in fairly heavy weather
in lake ontario and lived to tell the tale. it also served as a tender and a
fishing boat and once as an ice chest for beer and wine for a big party. a very
useful craft indeed.
Walt Conrad wrote:
Hi,do I need To waterproof the lumber used in in the boat,or can I coat the
whole thing with epoxy when it's done?If I need to waterproof, what do I
use?
ANSWER: Where epoxy is going to be exposed to sun light, it must be
painted or varnished. In order to paint or varnish, it must be thoroughly
sanded. So... If you intend to coat with epoxy, it is easier if you coat AND
sand prior to assembly.
Instead of epoxy, you can use an anti-rot coating and paint.
I'd like to use fir and built up plywood where I can, is a plywood stem
much weaker than oak?
ANSWER: Douglas-fir is a good boatbuilding lumber, but do not use
construction grade. It must be clear, straight grained, and properly
dried.
Plywood stems are used because they are more dimensionally stable. The use of
oak for the stem can cause the planking junction at the stem to crack, whether
fiberglassed or not.
Is red oak suitible for boat building?
White oak is special order here and costs more. Is it advisable to use fir
in place of hardwood. I've heard oak splits easily. Fir seems like it would
be easier to work with ,plus it's cheaper. I'd use hard wood for the
skeg And outer sheers. I'll be using the boat in Lake Mead NV. Thanks
Walt
ANSWER: It is not recommended as it is more prone to rot.
--
Barry
Customer Service
Ben Packard wrote:
I have built two boats from your collection, but have been unable to get a
nice glossy finish like a Factory made boat has. I'm about to throw
together a Glen-L 13 sail boat, so I've read up on it and it seems like it
requires a Gel Layer to make the effect. If I were to layer epoxy over the
cloth so I can't see the weave bumps, is it possible to sand it into a
glossy finish. I understand it also has to do with the paint used, but the
marine paints I've used are not real durable. Any suggestions? Thanks for
everything.
A Very Happy Customer
-Ben Packard
ANSWER: We fiberglass, covering the weave with resin. The boat is
sanded "level smooth", so there are no runs or bumps or dips, with no
finer than 100 grit sandpaper. Next we use a high-build primer. The one we have
been using is Z-Prime Pro. It is not marine, available at our local paint
store.
We sand the surface using wet and dry sandpaper to 220 or finer grit. For the
final coat we use InterLux Brightside, but any marine or industrial enamel can
be used.
The finish will be no better than the surface it is put on. Allyn usually would
spend 8 hours sanding the primer on a 13' boat. Preparation makes the
difference.
If you have brush strokes or roller stubble showing, check with mfr for
application suggestions.
We generally spray paint, but recently have been rolling with very thin (our
epoxy) rollers. Do not paint in the sun, use thinners recommended by mfr.
We have never used Gelcoat.
--
Barry, Customer Service
Thomas Watson wrote:
When building the Eight Ball, am I restricted to using spruce or mahogany as
listed in the bill of materials? If not, please recommend what other types of
wood are acceptable to use. Thank you, Thomas Watson.
ANSWER: Because of weight, spruce is preferred, especially for the
mast. For the boat hull you can use white oak, lonf-leaf yellow pine, clear,
straight-grain Douglas-fir. Ultimately, this is your boat; the above are
recommended woods, but you can use any wood you choose. It should be relatively
strong and water resistant, and free of knots, splits, and properly
dried.
--
Barry, Customer Service
name: Michael M Farish
Comments: Have built several of your boats over the years and enjoyed them
very much. I appreciate your hard work. I started reading your publications in
the early 60's. Thanks for showing me how to build a boat!
From Guest Book: Friday, July 16, 1999 at 14:47:53
Comments: I am starting with a 14' flat skiff as my first project.
Unfortunately, I found Glen-L a little too late. I have already decided, that
once this project is complete, my next one will be a Glen-L boat! You guys have
a lot more to offer than any other companies I've been to! I'm glad I
found you.
Christopher Day
Build more boats
Glen-L boats, of course
|