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blowing up plans - 4/30/2008 9:15:48 PM   
KI8FR


 

Posts: 815
Joined: 2/18/2004
From: Ovid, MI, USA
Status: offline 		Blowing up plans

In the new ama magazine that is a set of plans for a cool looking 60 size plane. I was thinking of blowing up the plans to be something like a 80” and put a gasser on it. What I am asking is, have any one tried this and is there any thing I need to know or plan on before I put the time and money in to doing this? What kind of problems will I run in to?

Stuff like that. Any info would be great.

Thanks
Paul
       Post #: 1

RE: blowing up plans - 4/30/2008 9:41:39 PM   
longdan



Posts: 462
Joined: 10/18/2006
From: Auckland, NEW ZEALAND
Status: offline 		The way I blow up plans (or reduce them) is to scan them at 1:1, then import the scanned image into autoCAD, then draw over them, then use the scale command to increase or decrease the size. Then draw in the structure in the correct size and thickness material that is available / required.
If you just get them enlarged at a copy centre, you will end up with a plan that shows all kinds of oddball material sizes.

(in reply to KI8FR)
       Post #: 2

RE: blowing up plans - 5/1/2008 12:43:53 AM   
Mooney_driver


 

Posts: 57
Joined: 3/22/2004
From: Ellensburg, WA, USA
Status: offline 		What file format do you scan the drawing in oritinally? JPG? PNG? Monochrome?

quote:

ORIGINAL: longdan
The way I blow up plans (or reduce them) is to scan them at 1:1, then import the scanned image into autoCAD,


(in reply to longdan)
       Post #: 3

RE: blowing up plans - 5/1/2008 1:08:31 AM   
longdan



Posts: 462
Joined: 10/18/2006
From: Auckland, NEW ZEALAND
Status: offline 		I find TIFF works quite well, but just about any format will work. Just make sure that the aspect ratio is locked. When I past it into CAD, i use the 'paste special' option, then paste as 'image entity'. It helps to have a known measurement on the original plans. i.e: before scanning, draw two short lines that are say, 6 inches apart. Then you can use the measure command in autocad to determine how much to scale the image to bring it to 1:1. Because when the image gets pasted into cad, it usually comes out at some oddball scale. Then once you have it at 1:1, start drawing over the lines. Use a colour like yellow or blue so that you can see the lines you have drawn against the white background of the plan image. Once you have an outline, and the positions of ribs, formers etc. then copy and paste your lines into a new drawing, scale up or down to required scale and go from there. Don't bother keeping the image of the plans in the drawing because it chews up a lot of memory (at least it does on my pc) and makes zooming, panning and refreshing very slow. I'm not sure what copyright laws are being breached in doing this.

(in reply to Mooney_driver)
       Post #: 4

RE: blowing up plans - 5/1/2008 2:32:34 PM   
Campy



Posts: 3354
Joined: 1/2/2002
From: Baltic, CT, USA
Status: offline 		A copy center can easily enlarge the plans, HOWEVER, then the fun begins.

You will need to go over the plans and measure the dimensions of the wood needed. Decide WHERE you will be measuring to - inside the lines or to the outside of the lines. The lines can get quite thick very fast when enlarging plans.

Use common sense when doing this. You will not need 1/4" thick wing ribs on 99% of your planes for example . 3/32" - 1/8" thick ribs will be adequate for 99% of the planes PROVIDED THE RIB SPACING IS NOT EXCESSIVE. If rib spacing is excessive you will need to adjust the spacing and add ribs.

The same holds true for other areas also - fuselage formers, sheeting, etc.

If you use common sense you should have no problems.

(in reply to longdan)
       Post #: 5

RE: blowing up plans - 5/10/2008 5:45:31 AM   
starcad



Posts: 215
Joined: 12/8/2001
From: Tucson, AZ, USA
Status: offline
quote:

ORIGINAL: longdan

I find TIFF works quite well, but just about any format will work. Just make sure that the aspect ratio is locked. When I past it into CAD, i use the 'paste special' option, then paste as 'image entity'. It helps to have a known measurement on the original plans. i.e: before scanning, draw two short lines that are say, 6 inches apart. Then you can use the measure command in autocad to determine how much to scale the image to bring it to 1:1. Because when the image gets pasted into cad, it usually comes out at some oddball scale. Then once you have it at 1:1, start drawing over the lines. Use a colour like yellow or blue so that you can see the lines you have drawn against the white background of the plan image. Once you have an outline, and the positions of ribs, formers etc. then copy and paste your lines into a new drawing, scale up or down to required scale and go from there. Don't bother keeping the image of the plans in the drawing because it chews up a lot of memory (at least it does on my pc) and makes zooming, panning and refreshing very slow. I'm not sure what copyright laws are being breached in doing this.


Actually there would be no breach in copyright as long as you own the copy of the plans and your making the enlarged version for your personnel use and not selling the enlargement. From what I read and discussed with my lawyer over the years as long as you own a legal copy of the design you can make as many planes as you wish. The big problem is when the copyright is removed or you try to sell multiple copies of the plans to others. You can sell your original copy or give it to someone.




_____________________________

So Many Plans, So Little Time!

(in reply to longdan)
       Post #: 6

RE: blowing up plans - 5/10/2008 1:59:15 PM   
jjscott



Posts: 164
Joined: 7/11/2007
From: Elm Grove, WI, USA
Status: offline 		There is another way that used to be used frequently, but you need to have the equipment to do it. You need a 35mm camera that will fill the frame with the page. Ideally, use slide film, but you can use print film if you don't have the slide film. Take the picture of the plan then project it with a slide projector on the wall. You can move the projector back and forth to get whatever size plane you want. It's harder to do if you use print film because the negative is projected, and it shows the line as white on a dark background. A dark room or basement works. I once did a 1/4 Citabria on my wall outside because I couldn't get the projector back far enough in the house.

The method's not perfect: the lines blow up in width, and you have to be careful of parallax when taking the slide. You may need to ask around to find a relative or friend with a slide projector and good film camera, but this method is cheap and relatively easy. I've used it dozens of times with success. Best is to pencil in the main outlines and structure on the wall, then fill in the details later.

Jim

(in reply to starcad)
       Post #: 7

RE: blowing up plans - 5/16/2008 11:18:35 PM   
alfredbmor



Posts: 911
Joined: 6/1/2005
From: El Paso, TX, USA
Status: offline 		At Kinkos or OfficeMax they have big scanners, scan as Longdan said 1:1
Then go home with the file and start resizing at you pleasure, be aware of the thicknes of materials as they do not need to be the size of the enlarged plans, you may input new values at your computer and check the availability of the stock wood to make better drawings.
Once you have the right drawing go back to kinkos or OffceMax and they will print it for you.
Sometimes some engineering is needed as some areas are a bit weak, then you can play with wood thickness or ad some structural streng on your drawings.
It is fun but takes some time and many drawings.


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(in reply to jjscott)
       Post #: 8

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