Bangladesh Air Force

is there a science or engineering link?

Unable to find one.

(Bangladesh holds a special place in my heart . . . and on the other hand, Saudia Arabia just fielded their first female jet fighter pilot; an amazing development in that part of the world, too).

/In the Newtonian World

Her airplane looks a little out of date.....

The powerplant was operating normally when the aircraft flew into terrain.

A more important question is why is the grass only growing under the plane?

The grasses are not growing under the plane. When during the flight the pilots had to make a crush land they did it on a grass filled land. It was rainy season, the field was muddy & the grasses were loosely bound to soil. When the kite had landed in that manner, nearby villagers rushed there for rescue and/or curiosity. Before the arrival of law enforcing personnel & a cordon was made by them, so many people had walked around it & the grasses were removed by their feet (as being muddy field) from the adjacent places of the kite. Where their feet did not reach, grasses were not removed.

After a large airshow (like Oshkosh) after the aircraft leave, you can easily tell where the aircraft were parked by the green grass/trampled grass patterns. The grass is protected by the wings and fuselage, and stays green and healthy. With the wet conditions for this aircraft, the grass is pushed into the mud and only the grass below the aircraft is safe from trampling.

But not generating thrust. Prop was turning but with the blades bent backwards, it was not pulling the plane forward. Engine was idle or prop was windmilling.

Fortunately, you don't investigate aircraft accidents.

Think about what you said.

You are correct, I do not investigate aircraft accidents. But I have read enough FAA and NTSB reports that indicate when propeller blades are bent backwards the prop is considered to be not producing thrust, and when the prop is bent forwards the prop is under power and generating thrust.

the first photo aircraft was producing power during ground impact.

second aircraft photo, prop was turning, but not generating thrust.

Sorry, I stand corrected.

Obviously I don't investigate aircraft accidents, either.

For I while I did have a free subscription to general aviation accident reports (quarterly publication). Then they went to electronic and I lost track of the source. Not everyone understands, but once you think it through it make sense. A loaded propeller generating thrust is flexed forward and will tend to bend forward when it strikes a solid surface. An unloaded prop does not have this flex and will tend to bend backwards as it strikes the ground. Think of the propeller as an airscrew.

The propeller you have shown does exist in this earth. But the propeller shown in Solar Eagle's post is deformed propeller of PT-6, a pilot trainer plane (made in China) used by Bangladesh Air Force, crushed in a training flight. This is an old type plane & BAF is going to replace these PT-6s shortly so far I have heard.

a prop that produces thrust?? interesting concept

What do they produce if not thrust?