Simon's spar is even stronger because of the bend!

That's right, folks! The neutral axis for tension and compression due to
bending has been moved off center, when stressed, more of the boom is in
compression rather than tension. The mid center joint means nothing with
such a clever and knowledgeable repair!

Don't believe me eh? Well check on the design of bridges - why are the spans
arched? Why do arches work for concrete? Concrete or stone block? Why are
engineered beams arched? Press stressed arches are used extensively, they
put the material in the arch more into compression rather than tension. Only
a REAL sailor would know this!! (Look at the undersides of decks of old
wooden ships - it's all arched too!!!)

Once again, the Simple one baits and hooks you all! He has proven many a
time who the simple ones really are!

I hope Bobsprit didn't get heart pangs from posting his silly web pictures.
Good job Simon, as always!

Simon's spar is even stronger because of the bend!

That's right, folks! The neutral axis for tension and compression due to
bending has been moved off center, when stressed, more of the boom is in
compression rather than tension. The mid center joint means nothing with
such a clever and knowledgeable repair!

Excuse me but I believe you are wrong because of the direction the boom is
bent. For it to be "stronger" it would have to be arched up in the middle away
from the pull of the mainsheet and vang.
S/V Express 30 "Ringmaster"
Trains are a winter sport

aah ahaha ahahah haaah haaaaa!!!!

Caught ya!

It's not a loose footed main, there's a rope bolt!

The force is from the sail distributed along the length of the boom. The
boom keeps the sail from pulling up, that's right!, pulling up!! The forces
of the mainsheet in the downward direction are minimal and occur at a point,
not along the boom. The force of the vang, at best only 1/2 downward are on
the front portion of the boom.

Simon has done well.

"SAIL LOCO" wrote in message
...
Simon's spar is even stronger because of the bend!

That's right, folks! The neutral axis for tension and compression due to
bending has been moved off center, when stressed, more of the boom is in
compression rather than tension. The mid center joint means nothing with
such a clever and knowledgeable repair!

Excuse me but I believe you are wrong because of the direction the boom is
bent. For it to be "stronger" it would have to be arched up in the middle
away
from the pull of the mainsheet and vang.
S/V Express 30 "Ringmaster"
Trains are a winter sport

Sidney Greenstreet wrote:

It's not a loose footed main, there's a rope bolt!

The force is from the sail distributed along the length of the boom.
The boom keeps the sail from pulling up, that's right!, pulling up!!
The forces of the mainsheet in the downward direction are minimal and
occur at a point, not along the boom. The force of the vang, at best
only 1/2 downward are on the front portion of the boom.

It's a shelf foot. If my understanding of a shelf foot is correct, the
forces from sail are on the ends of the boom, similar to a loose foot. Since
the mainsheet is mid-boom, and since the boom bends downwards in the middle,
your arch theory is wrong.


--
Wally
www.makearatherlonglinkthattakesyounowhere.com
Things are always clearer in the cold, post-upload light.

Not so!

Check again.

"Wally" wrote in message
...
Sidney Greenstreet wrote:

It's not a loose footed main, there's a rope bolt!

The force is from the sail distributed along the length of the boom.
The boom keeps the sail from pulling up, that's right!, pulling up!!
The forces of the mainsheet in the downward direction are minimal and
occur at a point, not along the boom. The force of the vang, at best
only 1/2 downward are on the front portion of the boom.

It's a shelf foot. If my understanding of a shelf foot is correct, the
forces from sail are on the ends of the boom, similar to a loose foot.
Since
the mainsheet is mid-boom, and since the boom bends downwards in the
middle,
your arch theory is wrong.


--
Wally
www.makearatherlonglinkthattakesyounowhere.com
Things are always clearer in the cold, post-upload light.

SG,

You better not say anymore until You learn about a shelf footed main.
You are WRONG. The sail provides NO upward force at all in the
mid-section of the main.

A Shelf Main is a free footed sail in all respects. The shelf provides
nothing to the TRIM

Ole Thom

Thom Stewart wrote:

A Shelf Main is a free footed sail in all respects. The shelf provides
nothing to the TRIM

So, what is the shelf for? I can see what it is, but not what purpose it
serves.


--
Wally
www.makearatherlonglinkthattakesyounowhere.com
Things are always clearer in the cold, post-upload light.

It collects rainwater.

Cheers MC

Wally wrote:

Thom Stewart wrote:


A Shelf Main is a free footed sail in all respects. The shelf provides
nothing to the TRIM


So, what is the shelf for? I can see what it is, but not what purpose it
serves.


--
Wally
www.makearatherlonglinkthattakesyounowhere.com
Things are always clearer in the cold, post-upload light.

Good Lord. More in compression due to the bend? Is that why the crack is
so wide at the bottom?

Cheers MC

Sidney Greenstreet wrote:
Simon's spar is even stronger because of the bend!

That's right, folks! The neutral axis for tension and compression due to
bending has been moved off center, when stressed, more of the boom is in
compression rather than tension. The mid center joint means nothing with
such a clever and knowledgeable repair!

Don't believe me eh? Well check on the design of bridges - why are the spans
arched? Why do arches work for concrete? Concrete or stone block? Why are
engineered beams arched? Press stressed arches are used extensively, they
put the material in the arch more into compression rather than tension. Only
a REAL sailor would know this!! (Look at the undersides of decks of old
wooden ships - it's all arched too!!!)

Once again, the Simple one baits and hooks you all! He has proven many a
time who the simple ones really are!

I hope Bobsprit didn't get heart pangs from posting his silly web pictures.
Good job Simon, as always!