Many places have step files of their parts putting them together in assembly 2 and kicad fem seeing where they break under load would be a great tutorial.
using cad models to analise if the carbon fiber tube system would support what I would like?
I would like to have a structure a foam wing would cover like a large model airplane.
I would like to know how much the structure could lift.
I would like to know if the foam wings from flying foam or the carbon fiber from dragon plate would break what would break first without distructive testing or run to falure.
I can’t get freecad and assembly2 and fem to work in windows 10 many the tutorials are out of date
What exact is your question? How is your question related to FEM?
The fem tutorials don’t show use like when at what downward wind force my carbon fiber structure would be likely to stress and break. There are places with the step files all ready. Like dragon plate. I’d like to assemble them in freecad then use fem to know when would they fail.
Seams a cool project. How about posting some pictures of the word done already. We are interested in them any time. 
Sounds like a good plan to me. What exactly is your problem? At which point do you fail? If you would like to have help you should post a FreeCAD file of your problem.
bernd
Well here are two dragon plate carbon fiber tube connectors they may not be the 1" inch tube sizes like I would like to connect but this is showing where I get lost at finding where my model plane structure would need more of this product to support it.
I need to use assembly2 to put together a dragonplate frame and parts list to fit the largest flying foam wings.
- Assembley2 , then fem module and what the analisis means so I know when to add more support or that is the plane quadrotor has a max load before the structure starts to fategue.
testing with run to falure or destructive testing is expensive.
Ok I got some of the assembly 2 workbench to assemble some of my parts how to place something mid way down the tube I dont know yet but its progress.
Flying foam is down now so if .5 " in is the biggest tube at dragonplate with the modular connectors then that is what the model planes structure could be made with and tested tether load with fem module.
I think I found my answer this tutorial shows when a small popsicle stick sized bridge would break and then shows how a stronger bridge is almost there but the floor is still need of more reinforcement. They might have done it if the bridge strut was more 3d and the bridge surface was the top like a old style railroad bridge.
https://www.youtube.com/watch?v=9mLYVHHuOZE
The force is in newtons
they flip the forces
How to get the tube ends to fix to the couplings since they taper maby make a tube with a slightly larger outer skin to make it join by faces.
foam wings and carbon fiber spars may be modeled.