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Old Jan 06, 2011, 03:56 AM
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And if you read the entire thread, you will find that this has been well covered. Cheers.
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Old Jan 06, 2011, 04:18 AM
It only takes one good idea
dag214's Avatar
Fishers, Indiana
Joined Oct 2004
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Originally Posted by matthew73 View Post
And if you read the entire thread, you will find that this has been well covered. Cheers.
Yep!
A complete wing was made and then destroyed to test my design. The wing will work. The attachment points are a bit of a place to watch as they are designed for about 5-6 G's, so in flight i will be fine, but a really bad landing might hurt it.

Thanks, Dag
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Old Jan 06, 2011, 08:11 AM
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im not concerned with the design, it looks reinforced.
more about the materials used, i hope they are strong/stiff enough.
im sure this was discussed in the 600+ page thread....lol
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Old Jan 06, 2011, 08:19 AM
It only takes one good idea
dag214's Avatar
Fishers, Indiana
Joined Oct 2004
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Originally Posted by MrSilvia View Post
im not concerned with the design, it looks reinforced.
more about the materials used, i hope they are strong/stiff enough.
im sure this was discussed in the 600+ page thread....lol
Here is the test of just the spars. Actually I used sand bags and bricks.

The wing is made of balsa spars with pre-preg carbon fiber. The tensile test went to over 300 pounds per spar.

Thanks, DAG
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Old Jan 06, 2011, 08:55 AM
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here is the test of just the spars:d:d:d. Actually i used sand bags and bricks.

The wing is made of balsa spars with pre-preg carbon fiber. The tensile test went to over 300 pounds per spar.

Thanks, dag
wow
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Old Jan 06, 2011, 05:28 PM
I fly, therefore, I crash!!!
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San Jose, CA
Joined Jan 2008
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Believe me, there is not one part of this plane that Dag has not thoroughly researched and if he found "anything" he didn't like it was redone, or will be redone. Dag is VERY thorough!! Which is why I have no doubt that when this plane finally flies, it will be perfect!!

SteveT
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Old Jan 07, 2011, 03:17 AM
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Braunschweig, Germany
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Originally Posted by dag214 View Post
Here is the test of just the spars. Actually I used sand bags and bricks.

The wing is made of balsa spars with pre-preg carbon fiber. The tensile test went to over 300 pounds per spar.

Thanks, DAG
Wow, I missed these pictures. Just amazing work

Rock on Dag!

Cheers Alexander
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Old Jan 07, 2011, 07:38 AM
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United States, FL, Pembroke Pines
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Quote:
Originally Posted by dag214 View Post
Here is the test of just the spars. Actually I used sand bags and bricks.

The wing is made of balsa spars with pre-preg carbon fiber. The tensile test went to over 300 pounds per spar.

Thanks, DAG
Of course, humble as he is, DAG forgot to mention that this is the strength of the internal structure only, on top of that you have the balsa sheathing and the epoxy / fiberglass cloth to add strength!!!

- Birger
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Old Jan 07, 2011, 07:45 AM
It only takes one good idea
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Fishers, Indiana
Joined Oct 2004
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When I designed the wing I look at where the strength really needs to be, then I design for that. The wing my kinds are sitting on was version 2, and was way to strong for the loads it would see. My wing version 4 is where I am at, the weakest points are where the landing gear is attached, and where the wing attaches to the in-board wing, but all are still strong enough for my designed flight needs (I hope). To build a plane this big under 100 pounds is really the biggest challenge, on my other thread my Emmaselle II will be about 45 pounds with a 160" wing.

Rock On!

DAG
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Old Jan 07, 2011, 07:47 AM
It only takes one good idea
dag214's Avatar
Fishers, Indiana
Joined Oct 2004
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Originally Posted by AlexanderB View Post
Wow, I missed these pictures. Just amazing work

Rock on Dag!

Cheers Alexander
Thanks!

My son weighs 112 pounds in that photo. Those spars where way to strong, and the wing section only weight 2.1 pounds.

DAG
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Old Jan 07, 2011, 10:45 AM
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snivilous's Avatar
Joined Jan 2010
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Thanks!

My son weighs 112 pounds in that photo. Those spars where way to strong, and the wing section only weight 2.1 pounds.

DAG
holy
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Old Jan 07, 2011, 01:05 PM
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habitforming's Avatar
USA, KY, Hebron
Joined Dec 2005
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Do the "X"s on the shear webs exist on the newer design? I don't remember noticing those before. I assume that is a strip of carbon tow?
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Old Jan 09, 2011, 06:17 PM
It only takes one good idea
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Fishers, Indiana
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Do the "X"s on the shear webs exist on the newer design? I don't remember noticing those before. I assume that is a strip of carbon tow?
The "X's" were on my earlier design, way over-kill, not on my wing that will be part of the final airframe.

They were CF tow, and added unreal strength. I have leaned so much this past 3 years in applying my theories to my designs. Most RC planes are so over built. But many need to be because of hard landings, that is what breaking most RC planes, at least IMHO.

Thanks, Dag
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Old Jan 09, 2011, 06:22 PM
It only takes one good idea
dag214's Avatar
Fishers, Indiana
Joined Oct 2004
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And I am sure you are all (if interested) following my EII thread on my Emmaselle. The B-36 is very slow now until I get my garage back when it warms up.

Thanks!

DAG

Pics of Emma and the EII, and her in my office designing my next project (not really just drawing Sponge Bob)
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Old Jan 09, 2011, 06:40 PM
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Joined Dec 2002
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How Emma has grown since she was a wee munchkin sitting in Daddy's E1 plane during the build!

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