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How can I reverse a plan to build two wing halves

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brokenenglish08/02/2019 21:21:27
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539 forum posts
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I've always used the "window / bright daylight" method but, think about it... you don't need to tape the whole plan to a window. Nothing on the plan can move, so just hold small sections against the window, as convenient, and mark the few "strategic" points that you need in order to draw enough straight (ruled) lines to build on.

Piers Bowlan08/02/2019 22:02:32
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2118 forum posts
53 photos

I just checked my photocopy of the LMHT plan for distortion. Both wings were spot on with no distortion with their span or chord, compared to the original. I found the overall length of the fuselage was about 2mm longer with the copy but with my sloppy approach to building, well within limits! I also checked the tailplane and various bulkheads and all were good, so it looks like I will be able to sleep at night! The photocopier looked pretty new so perhaps the technology is somewhat better now.

I guess it is horses for courses and as long as you end up with a workable plan it doesn't matter how you achieve it. Personally, I like to keep the plan intact just in case I have to rebuild something at a later date.

Colin Leighfield08/02/2019 22:26:19
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5993 forum posts
2503 photos

I just wipe the plan with meths. It goes transparent, stays that way and dries quickly completely clean.

Stearman6508/02/2019 23:39:17
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Posted by Phil Horne on 08/02/2019 15:20:07:

i have the Moonglow plan but it only shows one wing panel. How can I get a reversed image of the plan to build the starboard wing. Is there a way of treating the paper so I can see through from the other side, therefore getting a mirror image?

I was going to build both wings in tandem on my WM Pilatus Porter P6, so I drew lines where the ribs would be, extending them onto my plasterboard building board, however when it came down to it I just taped the plan to the lounge window & drew the lines on the back.

p21.jpg

p22.jpg

Edited By Stearman65 on 08/02/2019 23:40:24

Phil Horne09/02/2019 01:15:39
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This is a great forum site, you guys have given so many useful tips, I thank you!

Cuban809/02/2019 11:57:22
2904 forum posts
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I think it's a poor show when a designer doesn't give even a simplified view of a second wing on a plan, even if that means going to two sheets and especially where the plan is two sheets already! Both views provided on my Brian Taylor Spitfire plan, but just the one on my latest build, the Dennis Bryant Chippy. Slopping oil or whatever over a plan is a non-starter for me, so I went with the 'up the window' light box method.

Despite the faffing about, it's not difficult and only a few minutes work to get the important stations. I always get a copy of the original plans from my local print shop, not the same quality paper, but well worth the extra few quid as it's helpful to have a clear view of what you're working on when the original is obscured by your workpiece. Being thinner paper does have the advantage of being easier to fold up to get on my printer/copier to produce templates. Unfortunately the machine they use to print locally, doesn't have the facility to do mirror image, hence the window trick.

 

Edited By Cuban8 on 09/02/2019 11:59:03

John Stainforth09/02/2019 12:59:58
329 forum posts
39 photos

Distortions caused by copiers are usually a result not of machine imprecision but of incorrect printer settings. One way to check for distortions is to draw a large circle on the plan with compasses, before copying, including marking the centre of the circle. It is then pretty obvious to the eye whether that is distorted or not after copying. Then one can draw another circle on the copy to see what correction factors have to be applied to the printer.

Steve Hargreaves - Moderator09/02/2019 15:25:02
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Posted by Robert Welford on 08/02/2019 15:46:45:

Use carbon paper under plan and trace through - gives mirror image on reverse side!

This is what I do.....use the carbon paper "carbon side" up though so the lines you draw over on the plan side appear on the rear of the plan....

As others have said all you really need are the spars LE/TE & ribs.....thumbs up

Martin Harris09/02/2019 18:25:02
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9262 forum posts
245 photos

Having thoroughly endorsed the paraffin method, I have worked from copied plans on many occasions, preferring to save the original. I've also used greaseproof paper to trace rib details to ensure mirror images as commercial plans with both wings detailed aren't always accurate!

kc09/02/2019 18:54:15
6417 forum posts
173 photos

Drawing the wing on the back of the plan only works with single sided plans and not with the pullout plans which have something else printed on the reverse. I have never used the carbon paper idea but it's so obvious when someone tells you!

I have always traced the wing plan onto tracing paper to save the original from damage and of course you just turn it over for the mirror image. I used the long rolls of greaseproof paper previously available from Tesco or Boots but in the last year or two the stuff they sell now is hardly translucent and it's brown. Useless for our purposes and you only find out when it's bought and paid for and the box is opened! Does anyone know of a good source now?


Martin Harris09/02/2019 19:01:39
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9262 forum posts
245 photos

My procurement consultant tells me that she bought the roll of "Jane Asher" Greaseproof and Baking Paper in the kitchen from ASDA...

Handyman09/02/2019 21:56:48
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215 forum posts
1 photos

A good printing shop could do you a mirror image of your plan. Just have to learn to read backward writing.

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