General > General Technical Chat
Mars helicopter
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floobydust:
I think I found the tech details: Mars Helicopter Technology Demonstrator
Battery is 6 of Sony Li-Ion 18650's 2Ah.
MikeK:
Launch is delayed for some reason.  Now it's no earlier than the 11th.  I wonder if they need more time to charge the batteries.
tszaboo:

--- Quote from: MikeK on April 03, 2021, 01:43:13 pm ---Launch is delayed for some reason.  Now it's no earlier than the 11th.  I wonder if they need more time to charge the batteries.

--- End quote ---
Probably weather. While the winds are much less than in the movies with Matt Daemon, its still a helicopter.


--- Quote ---Assuming that 20% of the power is at the peak load of 510 W and 80% is at a continuous load of 360 W, approximately 90 sec of flight is possible.
--- End quote ---
This is slightly disappointing, but understandable.

What would be the power dinamics of the flight? Martian atmosphere is much less dense, so it would need larger propellers or faster rotation. But on the other hand, if a propeller is in reduced atmosphere, and its moving less air, then there is less friction at the same propeller speed. Soo... With the same electrical power put in (assuming frictionless bearings and such) do you reach the same lift power? Only your propeller is much faster?
RoGeorge:
A larger, stitched view, together with the mothership:
https://apod.nasa.gov/apod/ap210403.html
MikeK:

--- Quote from: RoGeorge on April 03, 2021, 03:16:13 pm ---A larger, stitched view, together with the mothership:
https://apod.nasa.gov/apod/ap210403.html

--- End quote ---

Oh, it still hasn't been dropped yet.
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