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I use two 4mm carbon tubes, 800mm long.
On the ends I cut M3 inside. You must do this very careful in several steps and make them stable with glue inside.
To prevent breaking the tube, cutting the thread, I pulled over a printed tightly fitting bushing, which I can upload.
Besides my other planes it was flying at the InterEx 2016 in Versiox/Genevahttp://jivaro-models.org/interex_2016/index.html
They were very enthusiastic about of the speed which is possible.
But it is also posssible to land it slowly.
Anyway, I hope you are a experienced pilot ;-)