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Old 18-02-2006, 08:04 AM   #1
Alpha's last child
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Default Eagle basics - Spine detail

Hey guys...

Been reading up about eagles on the board, and there is some great info, but some of the basics have not been documented. Now, maybe I'm slow, but I have these questions, and instead of just asking them, and then having new members and model builders troll through the board trying to find the answer, I thought maybe a "Eagle Basics" theme thread on different sections may be of use. Just trying to be a good board member and helpful at the same time!

(And get my questions answered!)

So, here is my first question. On the Eagle spine, there are raised detail where the horizontal and diagonal sections meet.

Here is a link to shugger's fantastic work on his Eagle spine which shows the raised detail http://public.fotki.com/shrugger/eagle_11/spine01.html

Now, here is the question. One way to make the raised detail is to used bigger tubing, but is it for detailing esthetics only, or does it provide some secondary function, like holding multiple spine parts together? Also, if building the spine in one overall length, what is the best method to attache these raised sections onto the spine.

Thats it for now. If there is a problem linking to your picture shugger, please let me know and I will work out another image. Hopefully, as these questions are answered, I hope to make the different components, and have images of my own to place online.

Thanks in advance...
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Old 18-02-2006, 10:45 AM   #2
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There is a larger gauge of tube slid over the longerons. Where the other parts come together in the joint would be a point of high stress on the longerons so the design incorporates these tubes as local reinforcing to spread the loads. I think it's a nice detail that adds an extra layer of reality to the design.
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Old 19-02-2006, 03:11 AM   #3
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I never knew that the pieces where actually there to "clean up" the wield. Very cleaver, and logical, once its pointed out to you!

Is the tube slit down one side to allow the larger tube to slide over the diagonal pieces?
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Old 19-02-2006, 04:05 PM   #4
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Wish I'd had my camera while building the spine
Tobor however did manage some nice shots while building his.
I think this should answer a few questions. I know he answered
quite a few of mine. Be sure to check out both of his Eagle's
http://www.btinternet.com/~tobor/frame2.htm
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Old 19-02-2006, 11:07 PM   #5
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The tubes aren't really there to clean up the joints. They there to increase the wall thickness of the longerons at key high stress points. They're complete tubes and go in place before any of the other parts are soldered together.
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Old 07-03-2006, 12:04 PM   #6
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After a little research, I finally understood what you meant DX-SFX. Took me awhile, but I got it.

Does anyone know the tube sizes for the relative Eagle models?

What size would be used for the 12"; 22"; 44"?

P.S. Did you get my PM DX-SFX?
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Old 07-03-2006, 01:15 PM   #7
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*
DX is away at the moment - sunning himself in foreign climes!
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Old 08-03-2006, 12:32 AM   #8
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The 44" would be 3/16, 1/4, 5/16. With .028 wall thickness they will telescope
into each other perfectly. http://www.specialshapes.com/
I also used the thinner .014 K&S for any of the
tubes that were soldered at each end (i.e. end doesn't show), as they are
easier to solder, lighter and save alot of time and files to shape.
I know DX doesn't like the K&S because he has access to cool shop tools
that tend to chew it up. But its great when all you've got is a Dremel and
and an endless supply of chainsaw files

The 22" would be half those measurements.
11" would be half again those measurements.
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Old 09-03-2006, 06:03 AM   #9
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Thanks Shugger.

As I don’t usually wok in inches, I decided to make a little table that converts the inches to decimal, and mm.

These are the measurements I cam up with using a pencil, paper and my copy of the Machinery's Handbook (19th Edition!)

If someone can eyeball the measurements, and let me know if they are good, I will make up a fact sheet with the scales and sized.


Here they are:

44” -– Scale
3/16 0.1875 4.763mm
1/4 0.250 6.35mm
5/16 0.3125 7.938mm

22” – Scale
3/32 0.09375 2.382mm
1/8 0.125 3.175mm
5/32 0.15625 3.969mm

12” – Scale
3/64 0.046875 1.190mm
5/8 0.0625 1.5875mm
25/32 0.078125 1.984375mm
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Old 12-10-2006, 12:57 AM   #10
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Default " VS mm

Well
ran off a lot of stuff ran my friends ink in the ground
i have been using both because there are places " work better then mm
work better in others


after a few hours researching i belive most of my stuff i have is thin walled (.014) and not up to the task of building the frame
so after i get a buzz from smiths i should be in the green again
but i do have enough for jigs ( got new stock the scrap would be a mother bear to ture up, and the lack of tools)
might get a small drill press (might be able to make a lot of angle cuts, cambers easier)

if any think a drill press will make it easier please post
YES my own eagle
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Old 12-10-2006, 01:19 AM   #11
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Quote:
12” – Scale
3/64 0.046875 1.190mm
5/8 0.0625 1.5875mm
25/32 0.078125 1.984375mm
Well, technically, that's for an 11" Eagle rather than a 12". Also just noticed that the maths has gone a bit wobbly too. The last two should read 1/16th and 5/64th respectively.
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