RE: [PSUBS-MAILIST] Carbon Arc Removal of Starboard Thruster Thru Hull

[Brent Hartwig <brenthartwig@hotmail.com>]

Very interesting Jay,  I'm so busy doing it the easy way, that I would see how much more work it would be to calculate every thing out old school style. I would still like to know how to do it. Knowing many ways of how to create and figure some thing out, is very advantages in CAD design.  Many times the software won't let you build some thing in a particular way. So you have to come at it from a different direction.
 
When the power goes out around here. I just go to bed, or go to the very local brew pub. They have lanterns and dancing bears just for such times. There is a sign that says don't buy the bears drinks. But everybody ignores it. I used to work next to the Bear show in Frontier Land, at Disney World, so it's nothing new to me. The river runs right under the bar. So you can just sit there and watch it. You know what the trouble with drinking and watching falling water is, right?
 

Regards,
Szybowski



 

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From: bottomgun@mindspring.com
To: personal_submersibles@psubs.org
Subject: RE: [PSUBS-MAILIST] Carbon Arc Removal of Starboard Thruster Thru Hull
Date: Sat, 22 Aug 2009 08:34:19 -0400

Brent,

Irregular shape volume is regularly calculated by Naval Architects using Simpson’s Rule or a similar means of integrating the volume from a series of area slices.  The area of the slice is multiplied by a factor whose magnitude varies with position (smaller at the ends) and these numbers are summed to obtain the volume which surprisingly comes out pretty accurately with the numbers from a 3-D CAD program results.  TO find the area of the sections on a drawing, a planimeter is used to trace the outline of the slice.  The planimeter’s output (if not the newer digital units) is then multiplied by a scaling factor to obtain the area.  Area can also be found using Simpson’s Rule or one of the other similar methods.

 

The CAD method is much easier and quicker but it is satisfying to have practiced the “old school” way and know that you can arrive at an area or volume when you have no power.

R/Jay

 

 

Resepectfully,

Jay K. Jeffries

Andros Is., Bahamas

 

Save the whales, collect the whole set.

 

 

 

From: owner-personal_submersibles@psubs.org [mailto:owner-personal_submersibles@psubs.org] On Behalf Of Brent Hartwig
Sent: Saturday, August 22, 2009 2:44 AM
To: PSUBSorg
Subject: RE: [PSUBS-MAILIST] Carbon Arc Removel of Starboard Thruster Thru Hull

 

How do you know all this cool stuff Frank? ;}
 
  I guess a alien ship builder has to be a jack of all traits.
 
I'm a furniture maker, I use ever sharps. ;}   Actually I did use a carpenters pencil today when I was tracing the shape of the horizontal base of my original Kittredge built MBT's today onto cardboard.  I needed to make more accurate 3D models of them, and add the 2 to 1 heads into them, so I could obtain the volume of the MBT's when they are attached to the sub.  The stern MBT is a little larger in some ways then the bow MBT, and a little smaller in some ways also. So it will remain to be seen if they hold the same volume.
 
I'm not sure how the Captain figured out the volume, with all these odd 3D shapes. Perhaps it was just one of those make your best guess, and then trial and error things.
 
It was nice to work on the bow MBT today, and continue the filler work, in preporation for making a master mold off of it.

Cheers,
Szybowski