I'm an Aussie, working on Duke of York Island, off the coast of Papua
New Guinea, as a volunteer teacher. I'm teachiung maritime studies;
navigation, boat building, fisihing etc. The school is dirt poor... me
too.
My boys and I have managed to salvage a GRP eighteen foot trailer
sailer. The deck is pretty buggered, and has been removed (by the
surf) but the hull, and centreboard (which is lead, about 150kg and
which I removed) aren't too bad. I intend to fit a keel, and make a
work boat for the school out of it; to teach the kids fibre glass
repair, and FAD deployment, and other boaty things.
I'm not exactly sure whether I should treat this as a displacement or
planing hull. Therefore, I'm not exactly sure what size outboard to
use. Banana boats are ubiquitous here, and everybody speaks in Yamaha,
40 hp terms, but that'd push the arse out of this little boat, and she
would be trying to climb her own bow wave.
Any help would be appreciated, and since I haven't got ready access to
the net (we haven't even got a telephone), replies copied to
would be appreciated.
Size of outboard? Central or offset?
Rigs, spars and sails from native materials? Bamboo/kokonas?
What else should I ask?
Tenk yu tru... That's Pigin for thanks a lot.
Geoff P

On 15 Apr 2004 13:51:30 -0700, (Geoff P) wrote:

I'm an Aussie, working on Duke of York Island, off the coast of Papua
New Guinea, as a volunteer teacher. I'm teachiung maritime studies;
navigation, boat building, fisihing etc. The school is dirt poor... me
too.
My boys and I have managed to salvage a GRP eighteen foot trailer
sailer. The deck is pretty buggered, and has been removed (by the
surf) but the hull, and centreboard (which is lead, about 150kg and
which I removed) aren't too bad. I intend to fit a keel, and make a
work boat for the school out of it; to teach the kids fibre glass
repair, and FAD deployment, and other boaty things.
I'm not exactly sure whether I should treat this as a displacement or
planing hull. Therefore, I'm not exactly sure what size outboard to
use. Banana boats are ubiquitous here, and everybody speaks in Yamaha,
40 hp terms, but that'd push the arse out of this little boat, and she
would be trying to climb her own bow wave.
Any help would be appreciated, and since I haven't got ready access to
the net (we haven't even got a telephone), replies copied to
would be appreciated.
Size of outboard? Central or offset?
Rigs, spars and sails from native materials? Bamboo/kokonas?
What else should I ask?
Tenk yu tru... That's Pigin for thanks a lot.
Geoff P
150 KG is a really heavy centerboard for an 18 foot boat, so it
probably isn't something that planed under sail ordinarily.


Rodney Myrvaagnes J36 Gjo/a


"The buck stops There."

Geoff P ) writes:

Rigs, spars and sails from native materials? Bamboo/kokonas?
What else should I ask?
Tenk yu tru... That's Pigin for thanks a lot.

use whatever wood is available cheap locally. light wieght and aloft is
important. bamboo is fine. the surface has silica in it and is quite
strong and abraision resistant. however the inside is soft and will get
softer and weak if wet, and rot if damp. so seal cracks and paint to
keep out water. probably should be cut and left ot dry out before use.

to save money look at native sailing rigs. no metal parts. governments and
the UN publish material on cheap rigs for fishing boats in developing
countries. Check with your local economic developement office.

sail size (power) depends on total weight of boat and contents (called
"displacement"). you can weigh the boat using a long enough lever and an
ordinary bathroom scale, a good exercise for students. Boatbuilder TF
Jones weighs his boats this way. the usual guidelines are 1) sail area
2.25 times the wetted surface area of the hull in light winds, 2) square
root of sail area 1-1.3 times the cube root of displacment in brisk winds.
But usually people compare to other boats of the same shape and weight.

a crab claw sail would be traditional for the area and provide most power
per square foot of cloth, but more work to change tacks. best for long
tacks in steady winds. for easier tacking (short trips, harbour sailing) a
sail with the front edge attached to the mast is best. I favour sprit
sails (cheap, simple, no metal hardware needed) for which there is info on
my web page. They are not very easy to reef. I've tried to describle the
step-by-step design of a small sailboat on my webiste (with lots of
numbers) in an article on a 15ft Solo cruiser. It shows what should be
considered. I'm an amateur, not a marine architecht or professional
designer. I used what I found in books on marine architechture and
sailboat design.

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On 15 Apr 2004 13:51:30 -0700, (Geoff P) wrote:

I'm not exactly sure what size outboard to
use. Banana boats are ubiquitous here, and everybody speaks in Yamaha,
40 hp terms

===========================

Anything in the 5 to 15 hp range should be fine for puttering around
at displacement speeds.