Originally Posted by K7SGJ
It sounds a lot like my old Esky V3 Coax (which is 3 years old, crashed a few times, and still flies). With the coax's any kind of hit generally strips the gears and bends the shafts. On mine it's the outer shaft that usually gets messed up (it figures, it's the more difficult one to replace). But sometimes the inner one will bend and , more often than not...BOTH!! I usually pull them out, take off the gears and roll them on a flat table. Any wobble and they are bent and need to be replaced. i've found even I slight bend can cause considerable power loss, short flight times, and reduced lift. This may sound dumb but of course make sure the right blades are on the right places. One time I accidentally put the top blades on the bottom and the bottom blades on top.
I don't fly the coax much these days and when i do its mostly indoors. Sometimes on a calm day I'll open the window (on the second floor) and starting from inside I'll fly it out the window and then back inside again. One time I flew it out the window, landed it on the patio, took off and brought it back in through the window. Another time a gust of wind blew it straight back in through the window and I crash landed it on a soft bed.
These days I mostly use the single rotor outdoors.
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