The fact is that we don't know anything at this point. From the description, it's as much stall-spiin as power failure. I know waiting is almost unbearable, but wait for the NTSB to publish at least a preliminary report before jumping to conclusions. Please.
This. I'll note that they found no "pre-impact anomalies" anywhere in the driveline, according to the report. There's a lot of data on the stall behavior of highly-tapered wings. It's not pleasant. Depending on the airfoils and twist, they can be benign, but with most combinations they tend towards nasty tip-stall behavior.Not to analyze without all of the facts, but a drop of one wing followed by a drop of the other wing (into the final roll) is certainly consistent with tip stall with a secondary stall of the other tip following correction of the first one. Hopefully they will be able to find the cause, but this is certainly a possibility given the observed deviations. No telling what the tip stall tendency is with that highly tapered wing.
Wow - for a speculative summary, that's hauntingly close. Obviously it was not underpowered but (at least) on the accident flight had a moment where there was inadequate thrust required to overcome drag and maintain altitude. The human factor comment of being unable to recognize and/or react to decaying airspeed (within the given time frame) is spot on. Pushing the nose over and landing off airport at 75 knots would take a lot of discipline but could have made a huge difference in survivability.It looked underpowered. The natural tendency is to pull into a stall. Happened to me. Very hard to force your hand to push the stick forward. A pilot with no experience in marginal powered aircraft has a problem. 11,000 hours in turbine military aircraft may not help in an underpowered aircraft.
It was reported to be the third and final flight before retirement. That implies a known problem. But I haven't read anything about the first two flights climb performance.
That latter sounds like their transmission system needed some rework.Final findings:
Sounds like TV on the front engine, while the rear engine was kept at low power because it skipped teeth at higher power settings...