Phils Rig School continued...

This one's better for you..

Hey GRF I've got just the T shirt for you . . . 



Edited by grimupnorth

You're not an engineer as well by any chance are you 'grim'

I'm sure somewhere somebody must have worked that out by now..

The "how big a mast do I need to make this boat do what I want it to?"

Question.

Surely even Lord Bethwaite must have worked that out..

If it's a displacement hull of w length and x beam it'll need some fraction
to equal y mast height because of the requirement to support z sq mtr of
sail area..

And if it's meant to plane, then the wetted surface area drag would have
to be factored into the equation, I'm not a mathematician, nor an
engineer, but there are plenty of the pedants about that would have
worked it all out.. The hull plus crew weight versus the drag coefficient of
the wetted surface... That will all give a sail area requirement, which in
turn will give a mast dimension.

Then all they need to do is come to us at Integrated Rig Systems Inc tell
us how many bits they need and bobs your sisters father probably..

Edited by G.R.F.

A young engineer was leaving the office at 5 p.m. when he found the CEO
standing in front of a shredder with a piece of paper in his hand.

"Listen," said the CEO, "this is important, and my secretary has left. Can you
make this thing work?"

"Certainly," said the young engineer. He turned the machine on, inserted the
paper, and pressed the start button.

"Excellent, excellent!" said the CEO as his paper disappeared inside the machine.
"I just need one copy."

Originally posted by G.R.F. You're not an engineer as well by any chance are you 'grim'

Got me there. Not a naval architect or anything but good
honours in mech eng with a specialisation in fluid
mechanics. Not that I do any engineering nowadays, but .
. .

Originally posted by G.R.F. The "how big a mast do I need to make this boat do what I want it to?" ... If it's a displacement hull of w length and x beam it'll need some fraction to equal y mast height because of the requirement to support z sq mtr of sail area.. ... I'm not a mathematician, nor an engineer, but there are plenty of the pedants about that would have worked it all out..

Ahem, yes they would be the same pedants who would have
asked stupid nitpicking over-detailed anal questions
like:
- unstayed or stayed mast?
- deck stepped or gate?
- spinnaker or not?
- trapeze or not?
- stiff hull or tupperware?

There are other even more pointless questions that these
beige-trousered sandal-wearing propellor-heads would ask,
such as "target crew weight? flat water or waves?
performance or sailability?" but you have already stopped
paying attention by now.

There is no analysis of hull dimensions that will tell
you the 'right' size and spec of rig until you have
answered all these other questions. If it was that easy,
why haven't rigs always been designed to the same
formula?
Oh, that's right, because the whole industry have either
had their heads up their *rses or because it's a
conspiracy set up by the illuminati, who are all 49er
sailors.