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today I went to make a flight with my helicopter (Raptor 30v2). I burned the first tank and everything went well. Noteworthy that recently I had changed clunk line, because I had problems with the engine tuning. When it was time for the second flight, I took off normaly and after 5 minutes, while I made hover at 5-6 meters height, the engine stopped. I landed as long as smoothly I could (I do not know to make autos) and while I wondered why the engine stopped, I observed that header tank was empty and the main tank was almost full. I understood that something didn't go well with clunk line. The reason that stopped the engine, appears in the first photo. I have put a piece of white tube into spoiled tube in order you can see the cut. With this clunk line I had burned only 5 tanks. I placed a new clunk line and I added an extra tube ring for safety as it appears in the second photograph. I consider that possibly it is better. Is it right or not? I am afraid that if this happens again, I 'll not be so lucky.. Does anybody know why the clunk line cutted this way? For what reason? Any suggestions?
Engine is the HEART of an r/c model, but THE PILOT is it's SOUL.