How Does A Jib Work?
 

In article , "James L"
wrote:

Thanks all for the info. I have one more practice session before I join a
novice's race this weekend. Will try to put into effect all your wisdom
passed.

I'm not sure there's a whole lot of wisdom in there, but you're more
than welcome.

Good luck and have fun!

Alan



"Alan Baker" wrote in message
...
In article , "James L"
wrote:

Thank you, but it raises more questions.

Won't the jib interfere with the main sail as it sits right in front of
the
mail sail albeit of smaller size?

It will *affect* the main sail, but the affect is positive when the
sails are trimmed correctly.


When running, doesn't the mail sail block the jib, almost completely?

Yes, if you are running dead downwind (which is slower than running at a
slight angle to the wind) and provided you don't "wing" the jib out to
the opposite side.

That's why the spinnaker was invented. g



What is heeling?

The boat tipping to the side in response to the force of the wind on the
sails.



When you say "above the center of buoyancy" do you mean in front of the
center of buoyancy or are you talking height?

Don't know where you're going here, but I'd say height.


Thanks

"Gianluca" wrote in message
. ..
The main reason for a jib to exist is that its profile combines with
that
of
the mainsail when going upwind in a way that increase considerably the
overall lift. The reason is very aerodynamical and not very easy to
visualise, it has to do with the combination of the fluid flow
circuitations.

On the other courses it's more square metres of sail there to push
more
without adding extra heeling on the boat, since they are at low height
above
the center of buoyancy.

At the beginning of your career you'll find very easy to steer the boa
t
upwind just on how the little red and green lines fly near the luff.


"James L" ha scritto nel messaggio
...
I am a newbie on a Laser Pico. Can someone explain to me what the
jib
sail
does and how it works?





--
Alan Baker
Vancouver, British Columbia
"If you raise the ceiling 4 feet, move the fireplace from that wall
to that wall, you'll still only get the full stereophonic effect
if you sit in the bottom of that cupboard."

--
Alan Baker
Vancouver, British Columbia
"If you raise the ceiling 4 feet, move the fireplace from that wall
to that wall, you'll still only get the full stereophonic effect
if you sit in the bottom of that cupboard."

How Does A Jib Work?
 

No way you can have any benefits in racing the boat from what we said abut
the physics of the problem.

Take as much as you can from the practice session and don't care too much
about "how it works". Be istinctive ;-)


"James L" ha scritto nel messaggio
...
Thanks all for the info. I have one more practice session before I join a
novice's race this weekend. Will try to put into effect all your wisdom
passed.

How Does A Jib Work?
 

Very correct.

Also there is a less visible effect due to the heel angle. If you view the
boat from the top and project the "centers of forces" (approximate) on the
horizontal plane, you see the arm of the moment that turns the nose up
increases with heel angle. This is the reason why heeling has lots to do
with tiller feedback and load.

Put in a practical way, you'd get a lot of load when the boat is too heeled.
Don't let her heel more than what you feel good. If she did, let her point
up slightly and release some load. If she permanently does, you're not
beating high enough.


"Alan Baker" ha scritto nel messaggio
...
In article , "James L"
wrote:

Thank you.

How does it relieve the pressure on the tiller? I do notice a strong
force
on the tiller when there is some wind. I don't remember this on the
Topper
that I used to sail earlier.

Very simply, the jib is set forward of the centre of lateral resistance
(the point about which all the lateral resistance of the hull and
underwater appendages combine to act) and the main is set aft of that
centre. If there's a large force on the tiller caused by the boat
wanting to turn up into the wind, then ease the main a little and trim
the jib a little tighter. If the force is caused by the boat wanting to
turn away from the wind, reverse it: main in, jib eased.



"John R Weiss" wrote in message
news:KebNc.190772$XM6.183421@attbi_s53...
"James L" wrote...
I am a newbie on a Laser Pico. Can someone explain to me what the
jib
sail
does and how it works?

It balances the rig to relieve pressure on the tiller, adds sail area,
and
provides an aerodynamic "slot" in front of the main to accelerate the
airflow and increase efficiency of the main.

Adjust the jib similar to the main -- the luff should be pointing into
the
relative wind except when running before the wind.



--
Alan Baker
Vancouver, British Columbia
"If you raise the ceiling 4 feet, move the fireplace from that wall
to that wall, you'll still only get the full stereophonic effect
if you sit in the bottom of that cupboard."

How Does A Jib Work?
 

Fella, if you want to learn about the physics of sailing, maybe a better bet
than usenet, is your local library, or even Google.

That way, you can save people bashing their heads against a brick wall
trying to understand what your level of knowledge is.

I recommend "Sailing theory & practice - Marchaj" if you know anything about
physics, and something with "for dummies" in the title if you dont.


"James L" wrote in message
...
Thank you, but it raises more questions.

Won't the jib interfere with the main sail as it sits right in front of
the
mail sail albeit of smaller size?

When running, doesn't the mail sail block the jib, almost completely?

What is heeling?

When you say "above the center of buoyancy" do you mean in front of the
center of buoyancy or are you talking height?

Thanks

"Gianluca" wrote in message
. ..
The main reason for a jib to exist is that its profile combines with
that
of
the mainsail when going upwind in a way that increase considerably the
overall lift. The reason is very aerodynamical and not very easy to
visualise, it has to do with the combination of the fluid flow
circuitations.

On the other courses it's more square metres of sail there to push more
without adding extra heeling on the boat, since they are at low height
above
the center of buoyancy.

At the beginning of your career you'll find very easy to steer the boat
upwind just on how the little red and green lines fly near the luff.


"James L" ha scritto nel messaggio
...
I am a newbie on a Laser Pico. Can someone explain to me what the jib
sail
does and how it works?