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Ingenuity- Mars 2020 Helicopter, Deployment & Operations
mcaplinger
post Feb 26 2024, 11:42 PM
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QUOTE (serpens @ Feb 26 2024, 03:11 PM) *
the left side of the solar panel is pushed down 90 degrees.

No, you are seeing the remaining part of one of the lower blades. The solar panel is undamaged and undisturbed.

I think the detached blade is consistent with being the whole half of the upper blade, broken at or near the root.

Much clearer image at https://www.flickr.com/photos/semeion/53549974562/


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Disclaimer: This post is based on public information only. Any opinions are my own.
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serpens
post Feb 27 2024, 09:03 PM
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Aah, clear now. I stand corrected.
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Bill Harris
post Feb 29 2024, 04:31 AM
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QUOTE (serpens @ Feb 26 2024, 06:11 PM) *
Yes, the blade end position and nearby impact mark indicate a straight line to Ingenuity's position. But the actual impact sequence is less clear. There seem to be two blade collision points (upper and lower?) and the left side of the solar panel is pushed down 90 degrees. Hard to see anything but a strike by an upper blade segment causing that and Tau's image seems to reveal only the inner section of the blade. Carbon fibre is strong and light but the blade tip speed is around 240mps and the velocity squared dominates in kinetic energy. I may be missing something but the impact outcomes on the blade seem complex, possibly a bend fracture then break at both the bend and the blade root, all at an impressive rotational velocity. Is there a missing part of the blade hiding somewhere?


It can be hard to say or visualize what a copter blade will do when impacting soft substrate at a low angle.
Ginny is down for the count but led a most excellent technology demonstration.

--Bill


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rlorenz
post Feb 29 2024, 11:36 PM
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QUOTE (Bill Harris @ Feb 28 2024, 11:31 PM) *
It can be hard to say or visualize what a copter blade will do when impacting soft substrate at a low angle.


The interaction of the striking blade tip with the sand ripple, and its direct local effects on a composite structure, are indeed not well-constrained.

However, I suspect it is the other blade of that rotor that broke and was flung away. You can see this happen on lots of youtube videos of helicopter crashes, notably those where the blades hit water. The sudden angular deceleration of the rotor causes a huge bending moment at the root of the other blades, which feel strong compulsion from Newton's First Law.......
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