Alessandro

are you addressing Ross Roy

or Rolls Royce?

"2 stations" in this whole discussion, 'stations' refers only to underwater profiles of a station

Alessandro is correct that there is a reference to calculus, but only a reference, (almost failed it in first year). That is the reason I moved from 10 stations to 28

What Alessandro describes in his second link is the same as my '5
STEP METHOD', the arithmetic is just laid out differently

'the mere fact of trying is a merit, in my point of view'

like this guy? (my brother did it in about 1964, it now hangs in my front hallway)

😁

Roy

Your memory is still holding well👍!

SIMPSON'S MULTIPLIERS!!

Roy,

Saw BLUE LEOPARD under sail video wow . . .

Roy,

It appears that this vessel will have a BLOCK COEFFICIENT of 0.6.

Yes, a block of wood would be 1.0 and a sharp bow and stern with a fin keel would be approaching zero, but what does 0.6 mean for a full keeled sailboat?

Thanks for any guidance

Ross

I have been struggling with my method of volume calculation. Particularly, how to identify a certain cube in the whole collection of cubes and part cubes. I sat down quietly and thought about it, after looking at BLOCK COOEFFICIENTS, (thanks to Roy for pointing me in the right direction). The calculation for block coefficient, is based on a 3 dimensional cartesian coordinates. X axis is the LENGTH AT WATERLINE, Y axis is the KEEL TO WATERLINE, and Z axis is the WIDTH. If I use 3 coordinates, I can identify any cube.

So in my case:

0 to 28 are choices for X coordinate
0 to 4 are choices for Y coordinate &
0 to 4 are choices for Z coordinate

I will set the ORIGIN at the bottom of the keel, behind the rudder post, on centreline. From there I go up to the waterline, forward toward the bow, and out to port & starboard sides

If I want a particular cube I can identify it's position with 3 numbers

eg 23,3,2. that would give me the cube close to the bow, almost to the waterline, and halfway between the centreline and the gunwale

Thank you Roy for you further thoughts. Actually I enjoy the planning part, the solving of a puzzle, (check some of the discussions between Alessandro and me). As you suggest the goal is stand-off scale sailing. If you go back a few entries you see my transport vehicle, my wife's truck. (yea, it's in her name and she is its driver). The basement here is empty and it's display spot is already picked out. My fear is that I will put it in the water and it will simply turn upside down. (another member here did that with an old carved boat, he caught it before it went under.) You mention earlier that one of your CE:LCP is 4%. Mine is currently calculated at 14%. A full schooner is supposed to be 7% The mast steps haven't been set yet, so that is definitely being shifted. Yes, I can do the calculations, but I need the modellers, like you, to add their personal input. As a wise nanny once said, IN EVERY JOB THAT MUST BE DONE THERE IS AN ELEMENT OF FUN. YOU FIND THE FUN AND SNAP, THE JOB'S A GAME! The puzzle solving is my therapy😁

Aren't these beautiful underwater lines? (WHAT?? it's just a bunch of numbers. Is he smoking that wacki tabaki again?)

The underwater coordinates in a 3D matrix. I now have to finish the formulas to make it work. I have an advantage of knowing how it SHOULD be. Each correction of a formula gets a little closer (as usual click the box in the corner and follow the prompts to open)

I finally got around to weighing the component parts of the boat. I am 2.6% overweight, from calculations. I consider that a great relief.

Without ballast yet
calculated:10.65kg
actual :10.92kg

CONTENTS: 1 SCHOONER, some assembly required

WINCHES:

Given the scale of the vessel and the size of the winches, they can be placed at or below the waterline. More important could be the position fore and aft for balance.

SAILS:

The plan is that the polyester-cotton sails will be only short term. As they pass the test, they will be upgraded to RIPSTOP, MORE WATER RESISTANT. High up weight, like any sailboat can be critical. I am hoping the Ripstop will help with that.

BALLAST:

The ballast, at this stage, is is set for 8 kg.

Be honest with me, is the mast in the right ways? The instructions said to insert tube into hole in keel. (the main spar of the ballast fin)