257" B-36D Scratch Build 6 a turning and 4 a burning - Page 600 - RC Groups
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Jan 06, 2011, 04:56 AM
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matthew73's Avatar
And if you read the entire thread, you will find that this has been well covered. Cheers.
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Jan 06, 2011, 05:18 AM
Rock On- Damon Atwood
dag214's Avatar
Quote:
Originally Posted by matthew73
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
Jan 06, 2011, 09:11 AM
BoyDrone
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
Jan 06, 2011, 09:19 AM
Rock On- Damon Atwood
dag214's Avatar
Quote:
Originally Posted by MrSilvia
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
Jan 06, 2011, 09:55 AM
BoyDrone
Quote:
Originally Posted by dag214
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
Jan 06, 2011, 06:28 PM
I fly, therefore, I crash!!!
SteveT.'s Avatar
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
Latest blog entry: My hangar...
Jan 07, 2011, 04:17 AM
Scratch Builder
AlexanderB's Avatar
Quote:
Originally Posted by dag214
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
Jan 07, 2011, 08:38 AM
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bdelapen's Avatar
Quote:
Originally Posted by dag214
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
Jan 07, 2011, 08:45 AM
Rock On- Damon Atwood
dag214's Avatar
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
Jan 07, 2011, 08:47 AM
Rock On- Damon Atwood
dag214's Avatar
Quote:
Originally Posted by AlexanderB
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
Jan 07, 2011, 11:45 AM
High Altitude Specialist
snivilous's Avatar
Quote:
Originally Posted by dag214
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
Jan 07, 2011, 02:05 PM
ΜΟΛΩΝ ΛΑΒΕ
habitforming's Avatar
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?
Jan 09, 2011, 07:17 PM
Rock On- Damon Atwood
dag214's Avatar
Quote:
Originally Posted by habitforming
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
Jan 09, 2011, 07:22 PM
Rock On- Damon Atwood
dag214's Avatar
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)
Jan 09, 2011, 07:40 PM
Registered User
How Emma has grown since she was a wee munchkin sitting in Daddy's E1 plane during the build!



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