Welcome to Tesla Motors Club
Discuss Tesla's Model S, Model 3, Model X, Model Y, Cybertruck, Roadster and More.
Register

BFS Centrifuge running track

ecarfan

Well-Known Member
Sep 21, 2013
19,361
14,034
West Vancouver, British Columbia
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.
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.
 
  • Like
Reactions: Grendal

ecarfan

Well-Known Member
Sep 21, 2013
19,361
14,034
West Vancouver, British Columbia
And I love Elon’s followup tweet: the man definitely knows his classic sci-fi. :cool:

AE23F58B-A1E3-45F5-B937-4E0FE1DAB3F9.jpeg
 
  • Like
Reactions: Model 3

ccutrer

Active Member
Sep 3, 2015
1,348
1,228
Eagle Mountain, UT
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.
So exactly as I had presumed. Except the director and cameraman. Poor guys! I’m sure they had a headache!
 

Cosmacelf

Well-Known Member
Mar 6, 2013
8,753
21,504
San Diego
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.

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.
 

mongo

Well-Known Member
May 3, 2017
13,325
40,775
Michigan
If BFS is 9 meters in diameter, it requires a 14 RPM spin rate to generate 1g at the skin.
F=v^2/r, 9.8=v^2/4.5
44.1=v^2
v=6.64 m/s
v=pi×9×spinRate
SpinRate=.235 rotations per second
14 RPM

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)
 

bxr140

Active Member
Nov 18, 2014
2,963
4,545
Bay Area
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.

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.
 
  • Like
Reactions: Grendal

Products we're discussing on TMC...

About Us

Formed in 2006, Tesla Motors Club (TMC) was the first independent online Tesla community. Today it remains the largest and most dynamic community of Tesla enthusiasts. Learn more.

Do you value your experience at TMC? Consider becoming a Supporting Member of Tesla Motors Club. As a thank you for your contribution, you'll get nearly no ads in the Community and Groups sections. Additional perks are available depending on the level of contribution. Please visit the Account Upgrades page for more details.


SUPPORT TMC
Top