I hope the blades aren't too long, or they would break the sound barrier! This might be a problem.
Helicopter on Mars in 2020
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May 15, 2018
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#3
About the Mars helicopter.
Apparently, it needs to work at 3000 rpm. The air on Mars is as thin as 2.5 times as high as the highest any helicopter has gone on Earth, but of course they are designed to work at ground level as well. The Mars copter has the advantage that gravity is lower, of course, but the air as is thin as at 100,000 feet above the Earth (more than 3 Everests).
https://www.popsci.com/mars-helicopter
This will happen in 2020. The Mars "air" is about 1% of what we have on earth. Therefore the helicopter blades will be designed to move about tens times as fast as similar blades on earth.
[the helicopter will be very small--however it may set a record for how high it can go!]