How Heavy is Reasonable In This Setting And What is TOO Heavy?

[magnemoe]

2 hours ago, Spacescifi said:

Negative matter is VERY weird stuff. I read that it is pushed away when you pull it, but attracted when you push it.

So if you saw a negative baseballl on the ground and picked it up, you would find getting it off you difficult until you found a way to pull it, which would propel the ball in the opposite direction. Let go completetly and the ball will fall upward into space and eventually reach escape velocity LOL!

A star trek more in line with modeen physics that had both localized gravity fields and negative matter would not use impulse drives.

They would use diametric drives, which split the ship in half while it accelerates chasing the other half that is pushed away just ahead.

Using a combo of negative matter and localized gravity fields.

Sounds a bit like an KSP kraken drive

And as negative matter is repulsed by gravity it would only be found as high speed cosmic rays. 

[kerbiloid]

1 hour ago, magnemoe said:

And as negative matter is repulsed by gravity it would only be found as high speed cosmic rays. 

A negative-matter dyno (un)killer.
Jumps from star to star at relativistic speed and unkills the dynos by not hitting.

[Spacescifi]

37 minutes ago, kerbiloid said:

A negative-matter dyno (un)killer.
Jumps from star to star at relativistic speed and unkills the dynos by not hitting.

 

Your joke is wrong.

1g won't be enough to stop something moving that fast.

 

[kerbiloid]

2 minutes ago, Spacescifi said:

1g won't be enough to stop something moving that fast.

Depends on stopping distance. And it begins at weighted midpoint.

Edited October 15, 2020 by kerbiloid

[sevenperforce]

14 hours ago, Spacescifi said:

Necessity is the mother of invention some say.

Plot is also the the mother of invention.

Some kid they had.

[Rakaydos]

On 10/13/2020 at 4:22 PM, Nuke said:

well if you assume the plane is and will remain completely prependicular to the motion vector. and if you assume that impacts will be infrequent. but take this up to near relativistic speeds and every little hydrogen atom represents a lot of energy and the forces on the moon would be fairly consistent. assuming a prependicular starting condition, the first impulse will slant the orbit such that there will be a nonzero prograde component to the force vectors. it will be tiny and would take a long time to build up any meaningful orbital energy.

there will also be natural plane tilt caused by the acceleration of the host planet. the moons will accelerate to keep up and this will tilt in the forward direction. impacts here translate into a retrograde component. managing throttle and velocity might find a breakeven point, but if you wanted to accelerate faster (and you would) you would have to re adjust the orbits of the moons to compensate for any prograde/retrograde force components.  but hey if you are moving a gas giant, so you can probably figure it out and have the tech to make it work. 

You're missing my point. On average, every single point in the orbit will receive the same number of relativistic hydrogen ions. As such, it doesn't alter the plane of the orbit so much as it shifts the plane of the orbit aft. This provides a drag force back on the gas giant due to gravitational coupling, which the fusion candle will have to compensate for.

[Spacescifi]

On 10/12/2020 at 10:25 AM, Nuke said:

just having your anti gravity engines operating asymmetrically can induce rotations. 

i think your real limits are structural. because a big structure is a complicated structure. you even run into this problem in ksp where you get huge oscillations that make things like docking and precision maneuvering impossible. huge cross sections make you susceptible to atmoshperic drag (in low orbits) not to mention space debris and dust at interstellar velocities. 

 

Rotation g-force is where your size limit comes, since we can only build so dense anyway.

If a vessel is the size of the ones seen in scifi (the enterprise, star destroyer etc), simply yawing, pitching, or rolling newtonian style WILL result in crew falling toward the outer walls.

Smaller ones have less of an g force rotation effect at low speeds.

Big ones will make g-force even at liw rotational speeds