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Jun 16, 2011, 08:34 PM
FPV junkie
m_beeson's Avatar

Break-down wings


I was looking for some carbon fiber rod to slip inside the carbon fiber tube

I had to settle for aluminum tube



I smeared a light coat of epoxy glue to the outside of the aluminum tube to snug the tollerances

between the two tubes.



Then I hot glued the one side of aluminum tube to the carbon fiber tube.









Last edited by m_beeson; Jun 16, 2011 at 08:40 PM.
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Jun 16, 2011, 09:04 PM
RTFM
octane81's Avatar
Quote:
Originally Posted by williamjames
Hey guys,

What can be used in place of the glue that comes with the package to attach the motor mount onto the fuselage? Hot glue has failed on me in the past. I've been advised to use 30min epoxy. Any feedback?

Thanks
It might work , but the epoxy gets real hard , and have previously cracked on me due to excess vibrations.
Jun 16, 2011, 09:33 PM
Registered User
Daemon's Avatar
Quote:
Originally Posted by m_beeson
I was looking for some carbon fiber rod to slip inside the carbon fiber tube
I had to settle for aluminum tube
Are you saying you cut the stock carbon joiners in half, and left em
glued into the wing? And then are using a smaller diameter aluminum rod
inside that as joiners? If so, why? Aluminum is not nearly as stiff as the same
diameter carbon and once it bends, it stays bent.

ian
Jun 16, 2011, 10:08 PM
FPV junkie
m_beeson's Avatar
Quote:
Originally Posted by Daemon
Are you saying you cut the stock carbon joiners in half, and left em
glued into the wing? And then are using a smaller diameter aluminum rod
inside that as joiners? If so, why? Aluminum is not nearly as stiff as the same
diameter carbon and once it bends, it stays bent.

ian

yes and no (aluminum tube)

Having that long of a wing is somewhat cumbersome to transport, so I decided to figure out a solution.

The aluminum tube is not nearly as heavy as aluminum rod in the same diameter.




I was looking for some carbon fiber (rod or tube) to slip inside, but the local Hobby Shop didn't have anything that worked,

so I had to settle on Aluminum Tube.

It has withstood some pretty heavy impacts already, and it is pretty convenient.


The protrusions under the wings which insert in the fuselage help to support the structure,

then I use 4 rubber bands lengthwise (2 on each side),

and 2 cris cross (one on each side), and it is a sound structure.



I also supported the wing support rods, much like you did.



After I notched the foam, and epoxied these supports in, I drilled them, and the wing support rods slide through the internal supports.


Thanks ian


Mike
Last edited by m_beeson; Jun 16, 2011 at 10:21 PM.
Jun 16, 2011, 10:25 PM
Registered User
Daemon's Avatar
I'm still not following why you did any of this.
What's wrong with simply pulling the stock uncut carbon joiners out of the wings when
you need to break it down for transportation? That's what most of us do, and it
works just fine. A small diameter aluminum tube simply cannot be as stiff as
the original larger carbon tubes.

ian
Jun 16, 2011, 10:35 PM
Registered User
Quote:
Originally Posted by williamjames
Hey guys,

What can be used in place of the glue that comes with the package to attach the motor mount onto the fuselage? Hot glue has failed on me in the past. I've been advised to use 30min epoxy. Any feedback?

Thanks
Hot glue works very well as long as you put dowel post on the motor mount. i have added 4 pcs. 15mm dowel on the motor mount.
Jun 16, 2011, 10:37 PM
Registered User
Quote:
Originally Posted by octane81
Do you recommend any of these over the included glue?
The included glue work very well. Easy to work with.:
Jun 16, 2011, 10:43 PM
FPV junkie
m_beeson's Avatar
Quote:
Originally Posted by Daemon
I'm still not following why you did any of this.
What's wrong with simply pulling the stock uncut carbon joiners out of the wings when
you need to break it down for transportation? That's what most of us do, and it
works just fine. A small diameter aluminum tube simply cannot be as stiff as
the original larger carbon tubes.

ian
I read the thread for three nights straight, and didn't even touch the latest materials. 500 pages is a lot of reading.

I missed that part, I figured you guys were gluing the wings as a single structure.

Mike
Jun 16, 2011, 10:46 PM
Registered User
Daemon's Avatar
The stock build just uses the carbon tubes as removable joiners, which is
why you don't see much discussion of it.
Some people choose to glue em in, but I've not found the need to do so.

ian
Jun 16, 2011, 10:59 PM
Whats the wrst that can happn?
AdamChicago's Avatar
I put aluminum rod inserts into my stock SW CF tubes and it works great!

The aluminum will hold a bend, but only when the angle of the bend exceeds that of the CF tube before the CF fractures...in otherwords the aluminum has a range of flexibility up to a point and you won't reach that except when you've already broke the CF tubes...and at that point you're probably screwed already

And I know because the video below shows my SW diving (at probably close to 100mph into Lake Michigan with NO DAMAGE!!!) (other than some electrical)

Here's my test...tested, and proven!
http://www.vimeo.com/24755130



Quote:
Originally Posted by m_beeson
yes and no (aluminum tube)

Having that long of a wing is somewhat cumbersome to transport, so I decided to figure out a solution.

The aluminum tube is not nearly as heavy as aluminum rod in the same diameter.




I was looking for some carbon fiber (rod or tube) to slip inside, but the local Hobby Shop didn't have anything that worked,

so I had to settle on Aluminum Tube.

It has withstood some pretty heavy impacts already, and it is pretty convenient.


The protrusions under the wings which insert in the fuselage help to support the structure,

then I use 4 rubber bands lengthwise (2 on each side),

and 2 cris cross (one on each side), and it is a sound structure.



I also supported the wing support rods, much like you did.



After I notched the foam, and epoxied these supports in, I drilled them, and the wing support rods slide through the internal supports.


Thanks ian


Mike
Jun 16, 2011, 11:00 PM
Whats the wrst that can happn?
AdamChicago's Avatar
deleted duplicate post...
Last edited by AdamChicago; Jun 17, 2011 at 08:34 PM.
Jun 16, 2011, 11:14 PM
Registered User
Daemon's Avatar
Quote:
Originally Posted by AdamChicago
I put aluminum rod inserts into my stock SW CF tubes and it works great!
Cept you didn't cut your carbon tubes in half. He did. His smaller diameter aluminum joiners
are taking 100% of the load.

ian
Jun 17, 2011, 12:23 AM
FPV junkie
m_beeson's Avatar
Quote:
Originally Posted by Daemon
Cept you didn't cut your carbon tubes in half. He did. His smaller diameter aluminum joiners
are taking 100% of the load.

ian
Correct,

I have 6" of tube on each side. That seems to distribute the load evenly, and puts the weakest point of the aluminum tube to the center of the wings.

Once it is strapped down with the rubber bands, It is pretty strong. It isn't a junction that concerns me.


However, I have added more weight. Joining the wings as you did was simple and efficient.

Mike
Jun 17, 2011, 12:40 AM
Never fly an A model anything!
jayb1rdz's Avatar
My wing is a single piece......because I am an idiot. I thought the glue had gone off when it hadn't.

No big deal for me. I expect I'll build a second once I have this one properly dialed in with all the electrics giving me my target range.
Jun 17, 2011, 01:08 AM
Fly Chitty Chitty Bang Bang!
EarthOrbiter's Avatar
What type of T Strength's are some using on Al?
The higher the more brittle with less bending


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