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Plan Drawing Meanings

What does it all mean??

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cymaz27/09/2012 20:30:07
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I love looking at the plans that come free with the RCME but I'm puzzled about something.

There are symbols and shapes that are all over the plan that I know nothing about. A black triangle springs to mind.

What do they all mean?? Could the RCME put some sort of permanent legend so people could use it as a reference?? Good for thickies like meface 15

FlyinBrian27/09/2012 20:33:25
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The black triangles normally denote for instance the side outline or doubler out line, normally there is a a note or key somewhere on the plan but if you study the plan for a while you will get the idea.

Pat (rActive) Harbord27/09/2012 20:40:35
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The black arrows usually indicate the extents of a fuselage doubler (often ply). Is there a specific plan you're having problems interpreting? I'll draw up a key for anyone that's interested. Also read through the build article with the plan laid out on the table, you can usually work things out.

and... Dive in, have a go at building something off plan. There is no better way to learn than to have a go. Plenty of us on here will be around to help you if you get stuck.

cymaz27/09/2012 20:48:18
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A key would be really good, I could print it off and pin it above my work bench....please...please...pleaseheart

Edited By cymaz on 27/09/2012 20:48:31

Pat (rActive) Harbord27/09/2012 20:49:55
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Ok, I'll draw something up now

cymaz27/09/2012 20:52:45
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OH I didn't mean you should start right now its nearly cocoa time beer

Pat (rActive) Harbord27/09/2012 22:15:35
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Not a problem, I was looking for a distraction

let me know what you think of this as a starter for 10, happy to add to it as we go along

Oops, just running the spell checker over it

Edited By rActive on 27/09/2012 22:18:04

Pat (rActive) Harbord27/09/2012 22:19:25
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plankey-01.jpg

Biggles' Elder Brother - Moderator28/09/2012 00:21:17
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Very neat, and useful, rActive! Nice one.

BEB

Edited By Biggles' Elder Brother - Moderator on 28/09/2012 00:22:09

cymaz28/09/2012 08:30:46
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Just what was wanted ......BRILLIANTenlightened. Anyone else add to it?????

Pat (rActive) Harbord28/09/2012 15:22:21
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I thank you. I'll dig out some more recent plans along with some oldies to see if there's anything else to add. Actually the problem is deciding what to leave out, I've purposely left out detailed definitions at this stage, but they could be added. E.g. CG what it means, why its important, how to balance etc.

I've got a feeling there's at least 2 books published on the subject of building from plans

kc28/09/2012 19:50:05
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The important thing about the black triangles and the white triangles is to study carefully where they differ. Usually the white shows the fuselage sides while the black the ply doubler which probably stops aft of the wing. But check the whole outline on each plan because sometimes the ply is cut away in unexpected places. So look for differences between white & black, maybe they show a 'ledge' to locate front former, maybe they are different where the balsa may be sanded away or shaped. Also note there could be 'treblers' which are a third thickness of ply or balsa, maybe with a different grain direction.

Sometimes the plan shows one half a wing with wing sheeting, other half without sheeting. Same with fuselage plan view....one half might show view from above, other half from below or under the top structure etc. Section of ailerons are often superimposed. Formers often shown one half with outer sheets and shaped, other half just former outline

Study your plan and as many of the other plans you can find. Spend an enjoyable hour or two studying plan before starting. Ask us if you dont understand. Older plans ( non CAD ) are often clearer than modern as the clever draughtsman used his pens to emphasise important parts better. Study the great David Boddingtons plans and any RCM plans from USA for clear detail.

David Boddington did an article on this in 1970's which was also printed in RCME etc plans handbook into the 1980's. This also specified a lot more including centre line and chain dotted line. .

twinstar28/09/2012 20:04:15
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im sure there was an RCME article a while back on building from plans, what the symbols mean etc, might have been in QEFI, maybe a year or two ago, i will have a rummidge in the box. and post more info i find anything.

Ian Jones29/09/2012 17:45:50
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Posted by rActive on 28/09/2012 15:22:21:

I thank you. I'll dig out some more recent plans along with some oldies to see if there's anything else to add. Actually the problem is deciding what to leave out, I've purposely left out detailed definitions at this stage, but they could be added. E.g. CG what it means, why its important, how to balance etc.

I've got a feeling there's at least 2 books published on the subject of building from plans

Good idea, well done.

Craig Carr29/09/2012 19:09:08
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Posted by twinstar on 28/09/2012 20:04:15:

im sure there was an RCME article a while back on building from plans, what the symbols mean etc, might have been in QEFI, maybe a year or two ago, i will have a rummidge in the box. and post more info i find anything.

 

Yes it was definetely rcme... I'm sure it was a Peter Lowe article. Im certain it was within the last 12 months...

Edited By Craig Carr on 29/09/2012 19:09:32

Anthony Briggs29/09/2012 22:20:45
3 forum posts

There are a dozen copies of David Boddington's book 'Building from Plans', first published in 1989 and again in 1995 at £5.95, available from Amazon at prices from 1p upwards (plus p&p). Surely worth a punt at this price ?

cymaz29/09/2012 22:24:08
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I'M ON IT NOWthumbs up

cymaz29/09/2012 22:29:15
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Just ordered total £2.81 including p&p smile pgift

Mike Rolls30/09/2012 09:56:29
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Just one ppoint - grain direction in ply can sometimes be important - for eaxample dihedral braces which tend tobe long and narrow. With 3-ply being the domnant material we use, such braces are noticeably stonger if the grain on tho outer two ply laminations runs lengthwise.

Mike

Pat (rActive) Harbord01/10/2012 18:16:59
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You are absolutely correct mr rolls, ill update my drawing when I have a moment.

I must say it was/is quite a challenge to write the descriptions as I've been building from plans since I was 8-9 (Kiel Kraft mostly in those days) an just absorb all the information and then make my own "improvements". Difficult to step back.

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