Spinward Flow
SOC-14 1K
COSTCO had a clearance sale on Magic Carpets™ ... so ...They just cancel out most of the gravitational acceleration, somehow.
![Man shrugging :man_shrugging: 🤷♂️](https://cdn.jsdelivr.net/joypixels/assets/8.0/png/unicode/64/1f937-2642.png)
COSTCO had a clearance sale on Magic Carpets™ ... so ...They just cancel out most of the gravitational acceleration, somehow.
I mean in Traveller Terms. We know the radius of worlds from size 1 to A with their 'gravity', and some Traveller rule sets have higher sized worlds.Without knowing either the mass or the mean density of the world, the question is unanswerable.
If the world’s mass is known, then g = GM ⁄ (r ²), where g is the surface gravity, G is the gravitational constant, M is the world’s mass, and r is the world’s radius.
If the world’s mean density is known, then g = (4π ⁄ 3) Gρr, where g, G, and r are as above, and ρ is the world’s mean density.
A 10 G world means g = 98.0665 m ⁄ s². The gravitational constant G = 6.67430(15)×10⁻¹¹ m³ ⁄ (s² kg). Fill in your choice of M kg (world mass) or ρ kg ⁄ m³ (world mean density), solve for the radius r, and the diameter will be 2r.
In TNE, you can do that to about 18G... at ever increasingly slow accelerations.What happens if you have a 1G acceleration ship and it lands on a 10G world?
My answer:
You just take off. Once Contra-grav is there, the field surrounding your ship is whatever gravity you want and so therefore you can take off and land without issues since you have nullified the local gravity. Escape velocity and mass become irrelevant with Contra-grav technology.
Reference: H. Beam Piper
either Cosmic Computer, Space Viking, or Four Day Planet.
Story/game engineering not SCIENCE fiction.So, basically ...
LBB2 put Sir Isaac Newton in the pilot's acceleration couch for maneuvering around.
MT told Sir Isaac Newton to "take a hike" and locked him outside the airlock as soon as he left.
TNE told Sir Isaac Newton "we don't serve your kind here"before making it rather obvious there was guillotine waiting for him if he lingered for being a public nuisance.
Makes perfect sense.![]()
This section seems to imply that Grav Modules screen a given mass up to a given gravity.Explorers: The added strength required to move and function in greater than 1G is easily understood by most people, and it is formidable.
It is also manageable with sufficiently advanced technology. Technology easily overcomes the problem through the use of grav modules. Heavy duty grav modules
neutralize the pull of gravity, making it possible for an individual to function normally. A standard grav belt is available at TL 12, costs Cr100,000, and can lift 200
kilograms against 1.5 gravities.
There's no magic mass manipulation, just thrust in CT:Looking at Book3, an air/raft uses 4 modules that appear to cancel 8 tons of mass (Nominally more, but note a number to quibble about). These 4 modules provide the nominal thrust for maneuver.
Lift & propulsion is force, thrust.LBB3'77, p17:
Air/Raft (8) CR 6,000,000. Also known as a flier, the air/raft relies on solid state null gravity modules for lift and propulsion. Four independent, individually replaceable modules (CR 1,000,000 each) insure a maximum of safety. Loss of one module reduces lift by one-quarter.
Go back and read the quote. Page 16 not 19... sorry typo. (actually read the page from the tiled pages of the PDF and not the actual books page number)There's no magic mass manipulation, just thrust in CT:
Well that is a simplistic why to look at it. In that there is the function of negating the gravity arrow, and a function of providing an external arrow of thrust. One does not necessarily mean the other . Also note the reduction of felt gravity in the example from Adventure 12.Lift & propulsion is force, thrust.
It's the definition?Well that is a simplistic why to look at it.
CT A12, p17:
A standard grav belt is available at TL 12, costs Cr100,000, and can lift 200 kilograms against 1.5 gravities.
It's lift, a force. No mass manipulation or decoupling from the geometry of curved space-time.CT A12, p17:
The best source of heavy duty grav modules is an airlraft. An available air/raft can be cannibalized to provide four modules, or replacement parts can be bought from a supplier. Each module costs Cr110,000, weighs 30kg, and can lift 200 kg against 2Gs.
I think I get your point too, I just don't see any support for it in CT.To be clear I get your point.
For a world with the same mean density as Earth, I calculated a diameter of 127,243.86 km, or 79,065.669 mi, so your T20 World Builder must be presuming a world with approximately the same mean density as Earth.I mean [the diameter of a 10 G world] in Traveller Terms. […] using my T20 World Builder, a 10G world would have a diameter of 128,000 km?
Page 18....
Grav Modules: Two airlraft grav mod- ules effectively negate local gravity of 3Gs. If one module fails, each action by a character expends one endurance point (regained by resting) and endur- ance or less must be thrown first, and the wearer drops at the rate of 15 meters per second per second. If both fail, the wearer is immobilized and drops at 30 meters per second per second.
Actually both of our suppositions do alter the geometry of Space-Time. Difference is how it does.It's lift, a force. No mass manipulation or decoupling from the geometry of curved space-time.
Which does imply my suppossion...
"The customer is ALWAYS RIGHT ... until computers are involved."as such both of our opinions can be correct.
Or assumes an outscale reaction mass.Actually both of our suppositions do alter the geometry of Space-Time. Difference is how it does.
There are hints of this in several adventures, most especially A12... but CT is maddeningly vague on operational means of the black box technologies.
I expect that’s the point of the vagueness.Honestly this is my point. CT implied several different methods.
MT/TNE listed at least 4.
T5 has 3ish... In a lot of ways it goes back to the CT model.
I will argue the differences, but still this is Traveller, what works at your table might work differently at mine.
Not as far as I can see: Agrav as thrust does not alter or decouple from the geometry of curved space-time anymore than a jet engine or helicopter rotor.Actually both of our suppositions do alter the geometry of Space-Time. Difference is how it does.
I do not see it: "effectively negate" means not really negate, but with the same effect, e.g. by opposing the downwards gravitational acceleration with an upward acceleration.Which does imply my supossion...Grav Modules: Two air/raft grav modules effectively negate local gravity of 3Gs.
Agreed, and both our opinions could be incorrect.Though I must remind you, this is Traveller, as such both of our opinions can be correct.
CT LBB3'77, p17:
Air/Raft (8) CR 6,000,000. Also known as a flier, the air/raft relies on solid state null gravity modules for lift and propulsion.
CT Striker, B3, p8:
K. Grav Generators: A grav vehicle requires grav generators installed in its chassis. Each .02 m3 of grav generators produces 1 ton of thrust and requires .1 megawatts of power from the power plant. They weigh 2 tons and cost Cr100,000 per m3.
TTNE's Contragrav Field (CGF) creates an interesting physics divergence that there's no current way to check: a difference in Inertial mass and gravitic mass.I do not see it: "effectively negate" means not really negate, but with the same effect, e.g. by opposing the downwards gravitational acceleration with an upward acceleration.
Contra-gm negates the gravitational force of over 99% of the vehicle's weight This allows light lift vehicles to actually be buoyant on worlds with sufficiently dense atmospheres.