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- Thread starter parmasson
- Start date

CT Adventure #11 "Murder on Arcturus Station" has partial deckplans for the station that is the setting for the mystery.

Most of the Traveller space stations I've seen have not been the classic spinning wheel but rather designs that relied on artificial gravity.

I am sure Stellar Reaches at this very moment is working on deckplans to match that wonderful article they had on Deep Space Stations.

Last source that I could think of surely either SJG or Cargonaught must have done something on orbital starports which is just another name for a Lagrange station.

Here is a question for the board gearhead/physicists: Is it possible to have a Lagrange system when the planet does not have a satellite/moon?

This link has the big math but it also has some pretty pictures for the rest of us. Caution it is a PDF file.

Big Math PDF

Sadly, I possess not the skills of a cartographer, and so am dependent on these good people to provide said deckplans, if they would be so inclined.Originally posted by kafka47:

I am sure Stellar Reaches at this very moment is working on deckplans to match that wonderful article they had on Deep Space Stations.

So, if you like making deckplans and want a challenge, try designing a set for the Deep Space Station described in

This public service announcement has been brought to you by the letters "SR",

Flynn

The station is going to be a spinning wheel station, a fairly big one. I am thinking two miles around the outside of the wheel and 1200 feet or so across. I am thinking five to six decks deep with an open air area in the top (inside) deck. How fast (RPM) would it have to spin to generate 1g and how much would that decrease the closer you got to the center. Is there a rule of thumb that I can apply?

At 600 ft radius, you would need to rotate the outer surface at 95mph to get 1g!

The only rule of thumb would be the formula:

Ar = V^2 / r

where Ar = g (in ft/sec^2 or whatever system you use), V = speed of the spot, and r = radius to that spot.

You mean this? It isn't deckplans, only LBB2 designs, though I intend to design the 1,000-dton station's decks very soon (for Stellar Reaches?).Originally posted by Fritz88:

FYI, if you can get a copy, do so.

Ty, and a good gaming day to you all!

Most sources suggest that, for the comfort of the general public, you need to keep the rotation to 1 rpm or less. 3 rpm causes brief nausea in most people and constant nausea in some people.

At 1 RPM your 1200 foot across station maxes out with an accelleration of 6.5 ft/sec^2, or 1/5g. To get 1 g you need to move a little faster than 2 rpm, and hope your residents have strong stomachs.

ThisOriginally posted by Parmasson:

Man I am in over my head! I am don't now what "^" is asking me to do in Ar = V^2 / r =

Perhaps the question I should ask is how big does it need to be to get my 1-1.5 rpm?

[edit] 4 miles = 1rpm?

Ca = 0.011 * Cr^2 * Cl

Cl = Ca / (0.011 * Cr^2)

Cr = sqrt( Ca / (0.011 * Cl))

where

Ca = centrifugal artificial gravity acceleration at point X (m/s^2)

(This is where you calculate or enter the desired gravity; 1.0 g is 9.81 m/s)

Cl = distance from point X to the center of rotation (m)

(This is the radius of the station.)

Cr = rotation rate at point X (rotations per minute)

I get a radius of about 891 meters = 0.55 miles for 1 G equivalent at 1 RPM.

396 meters = 0.25 miles at 1.5 RPM

Fair warning; any time you see me post math, double check the numbers.

Edit: Or, even better, this page has a graph.

Edit: re-checked my math

What about rather than a wheel with the spin gravity perpendicular to radial you turn it (not quite) 90 degrees. In effect rather than a long single level in a circle your gravity is a series of floors arranged around the center of spin. Like a skyscraper, only after you get to the Nth+1 floor you find yourself back at the 1st floor, if you follow. A diagram would make this so easy to see but I have no quick doodle handy.

Would you be able to make the radius smaller and the rotation faster by turning the floor in this way. In effect what you experience is direct thrust rather than centripital thrust, I think. There would be some centripital to counter (hence my "not quite" 90 degrees for the floors) but intuitively I think I can see this working.

Or is it time to take a nap

After a little second thought I think maybe it won't work but I can't quite get the old gray matter to concentrate and figure it out, long day.

One interesting note I did find while googling is a research paper that notes the minimum open floor space and minimum total floor space for long duration space habitats. Note it is area rather than volume since with gravity it is area that matters. An important concept for Traveller perhaps. At least it makes the stateroom allowances seem too small almost or at the very least quite reasonable. The requirements in the article are 8m2 open area per crew member and 40m2 total area per crew member. It doesn't say but I imagine a part of that is work space. Still the 8m2 of open area per crewmember is about the size of a Traveller stateroom (as half of the 4 dTons, 2 dTons being 3m x 3m = 9m2). I found it interesting.

If I'm indeed following you, it seems that the rotation speed would have to pretty high to add much.

The workspace data

Thanks!