6G ship acceleration limit

[aramis]

1/10th of a turn is not inconsequential time for coming about; further, it varies across editions quite a bit.

The CT bk 2 round is 1000 seconds, scale is 1mm=100,000m, 1G-turn=100mm/t

Given that there is no slop in the turn-distance using the traveller standard G of 10m/s², 100s seems an awful lot.

10s seems a bit too fast, but... given the Gazelle as shown in S7... 29sq x 1.5m =43.5m long for a 21.75m moment arm.

using 3rpm (180° per 10s), and a 21.75m moment arm, in the calculator at http://www.calctool.org/CALC/phys/newtonian/centrifugal I get 0.2G

punching in your 100s and 1km, I get 0.1G. But I can reject your 100s per 180° (1.8°/sec) as it would notably reduce the vector (above resolution of "ground" scale); heck, my 18°/sec is above threshold....

To keep it below resolution in CT, it has to be under 180° in under 1000/600=1.666s... 108°/sec... for a 6G craft.

For the gazelle, at 5G, 90°/s... prodcing 5.47G at the tip, and thus a net 10.94G tidal force on the hull.

 

[aramis]

Now, in MGT....
The turn is 6 minutes (360 sec), 10km is 1 thrust.

They use a badly broken thrust to change range table. 1G-turn changes position by 648km and vector by 1296km/t. It appears to be ground movement based, not vector...

But, given that 2 thrust to change from 1250km to under 10... that's close enough to 648/G to do the math. it's a slop factor of 46km.

Given that slop factor, and the accell formula that's 353.6 sec of accelleration. We need to be able to come about in 6.4 sec. Gazelle is roughly the same size, so...180°/6.4s=28.125°/s gives 0.5G centrifugal force, and 1G tidal stress.

 

[jshiggin]

By the way the g-ratings quoted for air combat aren't really gravity field generated, they are the result of inertia not gravity - two very different physical principles but confused by the use of the term g when discussion the forces on the airframe/crew.

Well, no. General Relativity says that inertial acceleration and gravitational acceleration are the same, differing only in the frame of reference. You can assume that someone in a centrifuge is stationary, and the universe is rotating around him, and the math all works out the same as if he were spinning and the rest of the universe is (more or less) stationary.

There. Got over my urge to bring Relativity into the discussion at least once a month. For now....