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Topic review - Need Help With Tables of Offsets
Author Message
  Post subject:  Re: Need Help With Tables of Offsets  Reply with quote
yea i read them and thats what I am drawing them up by. but i want to get the insides correct as close as possible as I am wanting to do it completely as framed as I can in cad virtually. I will do some mods when I make an R/C Model but I am trying to do it proper right now so that I understand how they were framed up


Attachments:
Wapama-23sm.png
Wapama-23sm.png [ 133.11 KiB | Viewed 1681 times ]
Post Posted: Fri Jan 06, 2017 1:28 am
  Post subject:  Re: Need Help With Tables of Offsets  Reply with quote
Joe,

The stations were not something that was actually constructed. They were just drafting aids for calculating the Table of Offsets. So they really don't have an "inside." In this plan the station lines are on the outside surface of the planking.

The hull was built up of frames, as shown in drawings 00012a.tiff, 00013a.tiff, 00014a.tiff, 00025a.tiff, and 00029a.tiff. The frames were built up of two layers with 13 futtocks - individual boards curved to the hull shape - as shown in 0014a.tiff.

Unless you plan to model the individual frames don't worry about the inside curvature of the frames.

Looks like there were 84 frames. Frame spacing was 30" (2' 6") center to center. The frames were made up of two layers of 10.5" thick futtocks, or 21" thick. So the gap between frames was 9". See 00025a.tiff.

These really are great drawings!

****

It's too bad the ship wasn't saved. It was the last of it's kind. The National Park Service just let it rot away. That is the fate of many museum ships. The USS Olympia C-6, Dewey's flagship at Manila in the Spanish American War, one of our nation's most historic ships, is in danger of sinking for lack of maintenance and repairs.

For the cost of a single F-22 fighter ($412,000,000 each) all historic ships in the US could be repaired and saved!

Phil
Post Posted: Fri Jan 06, 2017 1:07 am
  Post subject:  Re: Need Help With Tables of Offsets  Reply with quote
yea this is much tougher than the fletcher as the insides of the stations are narrowed and not parallel so will see how it turns out
Post Posted: Thu Jan 05, 2017 1:15 am
  Post subject:  Re: Need Help With Tables of Offsets  Reply with quote
Looks pretty good.

I used the buttock lines as test curves to check the accuracy of the hull surface stretched over the station lines. I used a light cyan like you used for the hull surface because it shades nicely and ripples show up pretty good. The buttock lines from the Table of Offsets were a bright color like red. When the hull was shaded, if the surface was perfect all of the buttock lines were visible. If any part dipped below the surface I knew the surface was a high at that point. Looking at the shaded hull surface from the inside I could see places where the surface was too low (high/low = transverse offset from the center line).

Also, I created vertical longitudinal contour lines (slices or intersection of a vertical plane and the hull surface) at the buttock line positions. Then I looked just at these contours and the buttock lines. If the hull surface is perfect the contours and buttock lines will be identical. Good luck getting that to happen!

Another useful trick is to create horizontal contour lines at different vertical heights. These are like the waterlines, and can be compared to the waterlines from the Table of Offsets. Also, if you just look at the contour lines along the length of the line (bow to stern, etc.) you can clearly see of there are any ripples in the surface - the lines won't be smooth curves but will be "wiggly."

Finally, by changing the light angle on the surface any ripples will show up as shadows.

Phil
Post Posted: Thu Jan 05, 2017 1:08 am
  Post subject:  Re: Need Help With Tables of Offsets  Reply with quote
well I got the basic middle station shape my problem is going to be finding an easy way yo get the rest of them and have a smooth transition between each without having the starved horse look. too bad the inner and outer portions werent the same shape but nooooo that would be too easy hehehe


Attachments:
Wapama-22.png
Wapama-22.png [ 107.27 KiB | Viewed 1701 times ]
Post Posted: Wed Jan 04, 2017 11:19 pm
  Post subject:  Re: Need Help With Tables of Offsets  Reply with quote
Well I got all the image planes made and mated into the proper locations. I took the planes and did intersect curve to them from my loft and the front 90% of the ship turned out beautiful. I still need to figure out the transom area but will take a break for now while I make all my 3D stations. it is always nice to take a break when something is driving you nuts. who knows maybe someone else with tons more experience, while playing with cad will have it figured out while I work on the other stuff


Attachments:
Wapama-20.png
Wapama-20.png [ 186.16 KiB | Viewed 1702 times ]
Wapama-21sm.png
Wapama-21sm.png [ 174.81 KiB | Viewed 1702 times ]
Post Posted: Wed Jan 04, 2017 10:47 pm
  Post subject:  Re: Need Help With Tables of Offsets  Reply with quote
Ok So now I decided to try working with the Buttocks. it makes it tricky as not all hit every station thus i need to do it in sections. once I get it though I can create more stations and wont need the Buttock Lines. this should give me a better hull shape when finished


Attachments:
Wapama-16.png
Wapama-16.png [ 95.05 KiB | Viewed 1721 times ]
Post Posted: Wed Jan 04, 2017 1:18 am
  Post subject:  Re: Need Help With Tables of Offsets  Reply with quote
Ok got a test loft going. looking good but for the transom. will add some buttock lines to my loft to help the shapes more.


Attachments:
Wapama-15.png
Wapama-15.png [ 86.11 KiB | Viewed 1722 times ]
Wapama-14.png
Wapama-14.png [ 128.01 KiB | Viewed 1722 times ]
Post Posted: Wed Jan 04, 2017 12:25 am
  Post subject:  Re: Need Help With Tables of Offsets  Reply with quote
Ok so I got things all adjusted in my excel file and any changes and repacked it all up so now it is current as to what I have it as now


http://www.proflooney.net/Steamer-Schooner-Wapama.zip
Post Posted: Tue Jan 03, 2017 4:43 am
  Post subject:  Re: Need Help With Tables of Offsets  Reply with quote
Ok I seem top have the Half-Siding Dimension however cant seem to get the Deck Sheer or Plank Sheer Numbers to work
Post Posted: Mon Jan 02, 2017 12:44 pm
  Post subject:  Re: Need Help With Tables of Offsets  Reply with quote
ok found the thayer drawings and put them away til later first i need to get the Wapama figured out
Post Posted: Mon Jan 02, 2017 1:29 am
  Post subject:  Re: Need Help With Tables of Offsets  Reply with quote
I find pics of the thayer but not the drawings I wouldnt mind doing that one also as always wanted an r/dc sailing ship and the hulls should be similar
Post Posted: Mon Jan 02, 2017 12:53 am
  Post subject:  Re: Need Help With Tables of Offsets  Reply with quote
Ok so now i started all over and got my main cirves now I will play around with numbers trying to get the top and bottom of the curves finished up.


Attachments:
Wapama-11.png
Wapama-11.png [ 172.7 KiB | Viewed 3131 times ]
Post Posted: Mon Jan 02, 2017 12:01 am
  Post subject:  Re: Need Help With Tables of Offsets  Reply with quote
well after work this afternoon i am starting over lol I cant seem to get this offset file to work dunno if reading wrong or what but i keep getting the wrong numbers for those 3 i need for each station
Post Posted: Sun Jan 01, 2017 7:09 am
  Post subject:  Re: Need Help With Tables of Offsets  Reply with quote
Thanks. I looked at the site and found plans for the C. A. Thayer! Lots of good photos too.

Phil
Post Posted: Sun Jan 01, 2017 12:15 am
  Post subject:  Re: Need Help With Tables of Offsets  Reply with quote
i found where got from heres some really good shipyard and other photos https://www.loc.gov/resource/hhh.wa0212.photos?st=gallery
and https://www.loc.gov/resource/hhh.ca1521.photos?st=gallery
Post Posted: Sat Dec 31, 2016 4:00 am
  Post subject:  Re: Need Help With Tables of Offsets  Reply with quote
I think the rear is correct though looks like station 10 starts a knuckle around the transom
Post Posted: Sat Dec 31, 2016 3:12 am
  Post subject:  Re: Need Help With Tables of Offsets  Reply with quote
well still screwed up and not correct cause i couldnt figure out some of the dims but also some of the lines from the sketch wasnt sure on cause they blurred together but if I can tweak the transom area it will be really close and will look close enough


Attachments:
Wapama-10.png
Wapama-10.png [ 192.69 KiB | Viewed 3182 times ]
Post Posted: Sat Dec 31, 2016 3:06 am
  Post subject:  Re: Need Help With Tables of Offsets  Reply with quote
as you can see here most of my curves are there just missing the top and bottoms thats where the sheer numbers etc go.

9 1/2 and 10 are off so I need to mess with them but the rest are spot on.


Attachments:
Wapama-09.png
Wapama-09.png [ 178.25 KiB | Viewed 3193 times ]
Post Posted: Fri Dec 30, 2016 9:42 pm
  Post subject:  Re: Need Help With Tables of Offsets  Reply with quote
ok here are the dimensions

sheet 00006a i used for profile on the front plane and also for the stations on the right plane. I didnt cut the sheet I just used the wole sheet but the drawings are different scales thus the different szes.

for profile view:

Length: 3167.24720294in

Height: 2446.57474368in

For the Stations:

Length: 2111.33276274in

Height: 1630.92208528in

using those dimensions when you do the curve files in cad program with the offsets I have in the excel file they match up perfectly
Post Posted: Fri Dec 30, 2016 9:35 pm

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