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Threedee
Spar 3.5mm x 19.5" Carbon rod - 4g. Good for indoor planes under 32" WS


Bracing 4 x 2mmx11" carbon rods. 4g - Good for indoor planes up to 32" WS


Bracing 4 x 3.5mmx14" Bamboo scewers. 7g - Good for outdoor planes up to 36"



Overall im happy with the results, for an extra 3 more grams i get strength for an outdoor 3D plane.
Names Tuan Dinh aka Paintball_kidz
Dont wear me out


Check out my youtube
http://www.youtube.com/user/paintballkidz
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cncmachineguy
glad to see my weight results are confirmed!

3D thank you for the photos. I was beginning to think maybe I had done my math wrong, but you have demonstrated the bamboo is in fact about half the weight of CF.

You say an extra 3 grams, but you also have 4 x 14" = 56" of support instead of 19.5" in the first pic.
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kevinjt4
Where'd you get that plane from? Is it a mod of some sort? I'm interested in the wing design you have.
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Threedee
Which one? theres 2, if its the first one, I can not show you the plans but its a Clik-X. If its the second one than it can be found here http://www.rcgroups.com/forums/showthread.php?t=623223

And what do you mean when you say is it a mod of some sort
Names Tuan Dinh aka Paintball_kidz
Dont wear me out


Check out my youtube
http://www.youtube.com/user/paintballkidz
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Threedee
I'de like to bump this thread, as i see alot of people with attemps to make there airframe stronger and are complaining about flexing, hopefully this may help newer guys with building a cheap and successful plane.
Names Tuan Dinh aka Paintball_kidz
Dont wear me out


Check out my youtube
http://www.youtube.com/user/paintballkidz
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bshupe
I use the same skewers as well as some that are smaller diameter and length but I embed them in the foam rather than build an exoskeleton with them although clearly your idea works well.
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Midnite Tweeker
Embedding into the foam makes it cleaner and more aerodynamic. But putting struts further from the bending axis like 3D has done makes it stronger.

A possible compromise is to use Kevlar fishline instead of struts. Cut short pieces of rigid plastic pushrod tubing for eyelets and glue them into holes in the same locations where 3D's struts attach. Lace the fishline through the eyelets. Because you can't push a piece of string like you can bamboo or carbon, you will need to use fishline on both top and bottom, left and right, to balance the tension.

Use a small piece of toothpick tied to the end of the line to anchor one end, then lace through all eyelets back and forth-top and bottom, ending back at the original eyelet. Pull tight, then anchor with a tiny dot of CA inside the eyelet. The go back and adjust all sections of the fishline so the tension is equal and wings/fuse/tail are lined up properly. Then add another tiny drop of CA into each eyelet. I have enough tension that each section of line makes a "tink tink" sound like a guitar string when you pluck it.

The fishline is nearly invisible and the total weight of eyelets, CA, and fishline can't be much over 1 or 2 grams.

MT
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phoenix_md
Just adding my 2 cents,

Carbon fiber tubing (3mm) is not that expensive, $1.20 per piece from HK. At this price order a couple of dozen of these and keep them handy.

I recently totalled my first build, an F22 v2 and I found that I could quite easily remove the CF and strip off the excess foam and epoxy with the utility blade.

Now I have the pieces cut to the right length and ready to go for my next F22 v2.

With the low price, the re-usability and the superior performance (less flex, greater strength, etc,) there is really no reason to use anything else.
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squishy
Check out the Fly it Like You Stole it thread...
"Education is not about filling buckets; it is lighting fires." W.B. Yeats

http://www.youtube.com/user/squishy654
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wasimeffendi
sluggish
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squishy
chainsaw
"Education is not about filling buckets; it is lighting fires." W.B. Yeats

http://www.youtube.com/user/squishy654
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LukeWarm
Quote:

3.5mm x 19.5" Carbon rod - 4g.
4 x 3.5mmx14" Bamboo scewers. 7g

Quote:

you have demonstrated the bamboo is in fact about half the weight of CF.

Did I miss something, I thought 7 grams is heavier the 4 grams.

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Just adding my 2 cents,
Carbon fiber tubing (3mm) is not that expensive, $1.20 per piece from HK. At this price order a couple of dozen of these and keep them handy.
I recently totalled my first build, an F22 v2 and I found that I could quite easily remove the CF and strip off the excess foam and epoxy with the utility blade.
Now I have the pieces cut to the right length and ready to go for my next F22 v2.
With the low price, the re-usability and the superior performance (less flex, greater strength, etc,) there is really no reason to use anything else.

I mostly use Bamboo skewers for quick repairs. For building purposes, Bamboo skewers are a cheaper alternative to the more the flexible, lighter Carbon fiber rod.

We found the extra 300's tail was too flexible. Running a extra 1 inch by 8 inch piece of foam down the tail shaft , fixed the problem. Lean it up against the vertical and horizontal tail shaft to form a triangle. The shaft was then stiff, but aerodynamic. We tried other ways, but one good bump, and we had to reglue everything to tighten it back up. On a 3D plane, Very stiff is best, But this is foam your dealing with. After we modified the tail shaft, the extra 300 was stiff enough to fly well. Foam is lighter than Bamboo.
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Jedimaster711
if you guys are looking for low cost i am trying to make a plane with dollar trees posterboard
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Dabrudda
Embedding the bamboo into the foam with epoxy might work better. I use bamboo skewers from Walmart and 3/16" wooden dowels from HD or Lowes. Can't beat the price on either. The combination of the dowel/skewer and epoxy are strong and rigid.

I made a post a while back about cutting slots with my dremel.
http://www.rcpowers.com/community/threads/cutting-carbon-fiber-or-bamboo-spar-slots-with-dremel.14072/#post-149857
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