I was initially hesitant to post this incident, but I decided if it was useful to anyone else it was worth it.
The engine is a new Lycoming Thunderbolt YO-233-EXP. I had Lycoming run it for two hours in the test cell.
I had been very happy with the engine. It was a smooth efficient running engine. I had not noticed any unusual readings or conditions in the first 20 hours.
The failed Connecting Rod Bolt has a beveled head on one end and threads and a nut on the lower end. The Connecting Rod Bolt failed and the nut and threaded end of the bolt disappeared ( Down in the sump?). The middle of the Connecting Rod is also missing, remaining are two stumps (~1? each) on the crank shaft end of the Connecting Rod and the piston end ( also down in the sump?).
First my good decision.
I chose to fly a race track parallel to the main runway at KMMV offset about five miles. My incident plan was, with an issue at the east end of the racetrack I would head for runway 22 , if the issue was at the west end I would head for runway 04, in the middle I would head for runway 35. In the actual event, runway 35 was about 40 degrees off the left wing at about five miles.
I discovered the Dynon Skyview has data logging.
Map
Oil Pressure
CHT & EGT
Sorry for the poor images they are photos of a printout and I do not know how to rotate them.
As Bubblehead said, that is a long/very short five minutes. In my case, engine failure to touchdown was about five minutes also. Pilot workload also peaks during that period, BIG TIME.
I would have guessed 1-2 minutes to touchdown, but the datalog shows nearly five minutes.
The datalog shows Oil Pressure dropped to near zero in about 30 sec.
The CHT Datelog shows the #3 cyl stopped moving quickly. The vibrations were a result of a three cyl engine running at 2000 rpm.
The CHT also shows that the three cyls were still running when I added throttle to insure I made the field.
I hope this adds to the collective knowledge and may be useful to someone else.
The engine is a new Lycoming Thunderbolt YO-233-EXP. I had Lycoming run it for two hours in the test cell.
I had been very happy with the engine. It was a smooth efficient running engine. I had not noticed any unusual readings or conditions in the first 20 hours.
The failed Connecting Rod Bolt has a beveled head on one end and threads and a nut on the lower end. The Connecting Rod Bolt failed and the nut and threaded end of the bolt disappeared ( Down in the sump?). The middle of the Connecting Rod is also missing, remaining are two stumps (~1? each) on the crank shaft end of the Connecting Rod and the piston end ( also down in the sump?).
First my good decision.
I chose to fly a race track parallel to the main runway at KMMV offset about five miles. My incident plan was, with an issue at the east end of the racetrack I would head for runway 22 , if the issue was at the west end I would head for runway 04, in the middle I would head for runway 35. In the actual event, runway 35 was about 40 degrees off the left wing at about five miles.
I discovered the Dynon Skyview has data logging.
Map
Oil Pressure
CHT & EGT
Sorry for the poor images they are photos of a printout and I do not know how to rotate them.
As Bubblehead said, that is a long/very short five minutes. In my case, engine failure to touchdown was about five minutes also. Pilot workload also peaks during that period, BIG TIME.
I would have guessed 1-2 minutes to touchdown, but the datalog shows nearly five minutes.
The datalog shows Oil Pressure dropped to near zero in about 30 sec.
The CHT Datelog shows the #3 cyl stopped moving quickly. The vibrations were a result of a three cyl engine running at 2000 rpm.
The CHT also shows that the three cyls were still running when I added throttle to insure I made the field.
I hope this adds to the collective knowledge and may be useful to someone else.