So I took it up for my first ever plane flight on Sunday. Great day. mid 60's. Slight breeze (flag barely twitching). Not a cloud to be seen.
First flight went well. Had some help for pre-flight inspection to make sure I put it together right and got the transmitter set right. Taxied out and took off without issue. Climbed did some clockwise circuits while my coach helped on the trim buttons to dial out some climbing tendency. Then proceeded with some more circuits and a figure eight or two. Then something odd happened. IT was off my left, about 10 o'clock, 15-20 ft up. I was making a tightish right turn, 180 degrees to come flying across the field left to right when, at the end of the turn it very quickly basically did a half roll to inverted. I didn't direct it to do it so far as I know. I don't think it was going slow enough to tip stall. It just rolled. I was totally unprepared for this. I hadn't even attempted a loop yet. I was already into the up elevator since the nose was dipping at the end of the turn. I instinctively hit throttle hold and since I was on the elevator already I yanked back hard and when it was rightside up again flipped off throttle hold and gunned it. Managed to climb out and after a couple of slow passes to get a feel for glide characteristics, landed it and that was it for the first flight.
Little later did a second flight. Did a loop and a roll. Was doing some figure eights when the same damn thing happened as in the first flight, same spot in the field and same orientation. IT rolled inverted. Except this time I was closer to the ground when it did it. I didn't managed to pull it out this time and ended up breaking the prop and bending up the gear a bit.
So... anyone got ideas on why it is rolling to inverted when executing the 180 right hand turn? It has an AS3X receiver in it. That seems to be doing it's job as far as correcting wind effects and whatnot. The turns were low bank turns for the most part, under low to moderate speed. I was tending to use a lot of rudder and only enough aileron and elevator to try to keep it relatively level through the turn without skidding too much.
I did notice that once on the second flight while I was making a left hand turn, this one very wide and high and under medium power, it did the same thing, but I fed in a lot of opposing aileron in time to correct it before it got too crazy.
Any idea on this issue welcome. I'm going to sim a bit tonight and try out the same kind of turn at the same orientation to see if I can replicate the behavior in sim. Wondering if I was at or near stall and didn't realize it. That or else I was feeding incorrect aileron on turn exit and ended up rolling it myself without realizing it.
