Morgan Ohlson ) writes:
Decide on a sail maker sail.

If I choose a couple of standard (common dinghies) sails. Can the sail maker
(dealer) tell
1. how large mast bending it's designed for (his standard CAD pattern for
that dinghy)?

for a dingy you usually suspend a 50 lb weight from the middle of he luff
position on the mast and measure the deflection for the sail maker. if you
use a mast off a one-design boat (eg a Proctor mast off a Wayfarer) the
sail maker probably has a pattern to go with the mast but it will be the
sail area used on the one-design boat.

2. if it's a weak or strong wind sail?

you can discuss the weight of sail cloth used.


3. Is it usually possible to choose the sails reef technique and /or
fastening method?

4. Can a tube GRP mast match an aluminum one in matter of stiffness? ...or
will it get way to big radius to match?

Morgan O.


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On 11 Oct 2004 15:49:58 GMT, William R. Watt wrote:

Morgan Ohlson ) writes:
Decide on a sail maker sail.

If I choose a couple of standard (common dinghies) sails. Can the sail maker
(dealer) tell
1. how large mast bending it's designed for (his standard CAD pattern for
that dinghy)?

for a dingy you usually suspend a 50 lb weight from the middle of he luff
position on the mast and measure the deflection for the sail maker.

That must go for a stayed mast. How about an unstayed?


if you
use a mast off a one-design boat (eg a Proctor mast off a Wayfarer) the
sail maker probably has a pattern to go with the mast but it will be the
sail area used on the one-design boat.

Yes, and that is my question.... does the maker know what kind of sail
pattern he has. If I like to make a mast I need data... just knowing wich
mast it may suit isn't much information to me... what I can see from here.


2. if it's a weak or strong wind sail?

you can discuss the weight of sail cloth used.

....and the profile?


Morgan O.

Morgan says:

Yes, and that is my question.... does the maker know what kind of sail
pattern he has.

If he doesn't, he isn't much of a sail-maker.

If I like to make a mast I need data... just knowing wich
mast it may suit isn't much information to me... what I can see from here.

Before you design the mast, talk to a sailmaker. Custom sails are more
expensive than sails for an established class, which will already have patterns
available. It may be much cheaper to buy a pre-made rig for a known boat.

Steve
Stephen C. Baker - Yacht Designer
http://members.aol.com/SailDesign/pr...cbweb/home.htm

On 11 Oct 2004 21:09:45 GMT, Stephen Baker wrote:

Morgan says:

Yes, and that is my question.... does the maker know what kind of sail
pattern he has.

If he doesn't, he isn't much of a sail-maker.

If I like to make a mast I need data... just knowing wich
mast it may suit isn't much information to me... what I can see from here.

Before you design the mast, talk to a sailmaker. Custom sails are more
expensive than sails for an established class, which will already have patterns
available. It may be much cheaper to buy a pre-made rig for a known boat.

Steve
Stephen C. Baker - Yacht Designer
http://members.aol.com/SailDesign/pr...cbweb/home.htm

Finding a matching

sail area (main and jib)
AND ratio (hight & foot)
AND mast length from base to boom
AND proper stayes (non-stayed)
AND (the most difficult) a self tacking, bomed jib

Is probably to many factors to find a standard rig.

So I must design something myself. I think I manage the mast best!

My present plan include designing just the rig and sail-plan. From that find
the best ´look-alike¡ sails from some large scale produced boat and make the
needed adjustment.

....and a proper design of the mast according to length and appropriate
bending at a (set) wind strength.

Morgan