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Discussion in 'SpaceX' started by malcolm, Jun 8, 2018.
Elon Musk on Twitter
bungees attached to rollers on rails/ tracks? Step up from treadmill... Velcro/ magnetic shoes ala Lego Movie?
It’s a scene from 2001: A Space Oddysey. I’m almost certain it’s a rotating wheel on its side, with the camera mounted to the wheel so that it “feels” stationary.
For trips between Earth and Mars a slow thermal barbecue roll makes sense and could provide some artificial gravity. Don't know if SpaceX has finalized their plans for BFR/BFS solar panels, but maintaining proper orientation and support would be a major factors. Would like to hear more details from Elon.
That 2001 film set was built like a Ferris wheel: the axis of rotation was at right angles to the ground so the actors could easily and realistically remain upright while moving. To film that scene the camera was bolted the floor, the camera operator and the director were strapped to their chairs, and they moved around the set while the actor remained at the bottom of the set while moving.
What Elon’s tweet appears to be saying is that the BFS will have a section with an internally rotating wheel that passengers can run or walk on in a similar manner. Which would be pretty cool but I think will take some practice to learn how to do.
And I love Elon’s followup tweet: the man definitely knows his classic sci-fi.
So exactly as I had presumed. Except the director and cameraman. Poor guys! I’m sure they had a headache!
Uh, shouldn’t take any practice at all. When not under acceleration (which is most of the time), you are in free fall. If they set the ship to spin radially, there will be apparent gravity towards the outer skin of the ship. It will appear that the outer skin is “down” as you walk around the outer skin from the inside.
I am assuming they will rotate the entire ship, although, I guess, they could just rotate a wheel, but that strikes me as more complicated. But maybe it isn’t.
If BFS is 9 meters in diameter, it requires a 14 RPM spin rate to generate 1g at the skin.
SpinRate=.235 rotations per second
Given that 6.64 m/s is about 15 MPH, if you sprint, you generate your own gravity equivalent force. Mobile exercise bike might be the way to go.
Of course, the track radius would be less than the outside diameter.
It seems like it would be really weird to have one's head moving at roughly half the speed of their feet (2 meter tall person typing). (One quarter the force at one's head also)
Ah, you might be right.
Recumbent bicycle might work well. Keeps most of the body near the outer diameter, easy to get velocity, low impact on people/ spacecraft. Computer tells you which way to pedal (CW vs CCW)
I would assume 1/4 g or something, not a full g.
Sure, I just used that for reference. 1/4 the force is 1/2 the velocity or 7 RPM.
Actually, if you’re heading for Mars, set it to Martian gravity, about 1/3 g, IIRC.
Perhaps, but structural or control issues (with weight moving around all the time) might limit the max G.
It will be interesting to see how much solar coverage a Mars transport vehicle needs. Body mount of course is an ideal solution for a thermal+gravity roll if there’s ebough surface area.
Slip rings on a solar drive mechanism are old hat though, so there could pretty easily be a sun-facing array bolted on the back/front of a spinning body.