Tianci, I think there is some kind of a misunderstanding. First of all, I did not crash the plane. In a low harrier pass it flamed out and it was like a hard harier landing. The plane was light enough that nothing was broken even cf landing gear was ok. In such a case nobody expects a tube failure. If you weigh the tube it is amazingly light (22 gr) but IMO it should be stronger. Like your comments on the engine box this is my comment on the cf tube. However my intension is to share experiences, exchange information and have a little fun here.. not get into endless disscusions. As you say.. it is more important to be nice.