[swatman260]

After a two week build, I was able to maiden my brand new QQ Yak 54 101 this past weekend. I used my DA 85 for this plane. This engine is about 7 months old and has probably 5-6 gallons of fuel through it.
The first flight lasted about 10 minutes, and was a perfect flight. The plane flew awesome and required only a few clicks of aileron to fly hands off. After the initial shake-down flight, I landed and checked over everything. All seemed to be good, so I re-fueled, let the engine cool down, and then flew again. About 3 minutes into this flight, the engine quit. I didn't have enough altitude or airspeed for a safe recovery and the plane pancaked into the ground. My brand new plane was pretty much destroyed.
Enough grumbling...Here is my question. This was a well broken-in engine that was properly tuned. I have had several other gas engines, so I'm pretty confident that tuning wasn't an issue. It was pretty early in the flight, and I had not been taxing the engine hard, so I don't feel that it was overheating. The fuel lines were still connected after the crash, and didn't have any blockage. Prior to the engine quitting, I was simply flying at about mid-throttle. There had been no significant changes in the throttle position. The motor had not been burbling (in fact, it had been running pretty smoothly), and did not lean out prior to quitting. It sounded as if it just shut off in mid flight. All flight batteries were checked post-crash and had full charges. Does anyone have any ideas as to why this engine would just quit running? I'm sending it back to DA to be checked out, but I'm gonna have a hard time feeling confident with this motor in the future. I don't think that I've ever had one just quit like this with no warning and no carb input. Any suggestion that you guys may have will be appreciated. I'm not trying to bash DA here, just find a solution to my problem.