Hi Kelly,
> On 06/25/2020 11:40 AM Kelly St. Clair <xxxxxx@efn.org> wrote:
>
>
> On 6/25/2020 8:04 AM, Thomas RUX wrote:
>
> > T4 FF&S p. 12 indicates "...The energy needed to initiate a jump is equal to 64 MJ per cubic meter per parsec jumped. This energy must be provided to the drive in an hour or less (meaning that a starship must have 0.018 Mw of power plant per cubic meter per jump number." Which is a return to CT LBB 5 HG that the ship's power plant provides energy to the jump drive.
>
> Since I don't have T4 FF&S: is there anything in the rest of that
> section that requires anything but energy? If not, would that not allow
> starships with no fuel tankage of their own to jump after being fed the
> required power by a tender?
Yes I beleive there is more in the section that requires anything but energy.
Here is a copy and paste from my PDF copy of the section pertaining to Jump Drive Operation. In the equations Voljd and Volship the jd and ship are subscripts. I hope that this time I caught all the changes.
T4 FF&S p. 12 Jump Drive Operation
Jump Drive Operation
The jump drive consists of two main components: the drive,
itself, and a lanthanum hull grid. The grid is applied to the
exterior of the ship, and the cost of the grid (and installation)
is included in the cost of the drive. Adding a hull grid to an
existing hull costs Cr150 per m3 of hull. The drive requires a
percentage of the ship's volume equal to 1 plus the maximum
jump number (Equation 2: Jump Drive Volume), while
the grid requires a portion of the hull's total surface area
(Equation 3: Jump Grid Area).
Equation 2: Jump Drive Volume
Voljd = 0.01 x (1+ Jn) x Volship
Equation 3: Jump Grid Area
Grid Area = Total Area x 0.005 x (2 + Jn)
The drive is connected to the hull grid network. The
jump drive requires fuel (liquid hydrogen) and energy (elec-tricity). Practically all of the energy and fuel are consumed in
creating the tunnel through jumpspace. Once the tunnel is
open, the ship must enter jumpspace or risk damage, misjump,
or destruction. The amount of fuel required for a successful
jump is equal to 10% of the displacement of the ship
per parsec of jump distance attempted. The amount of energy
required to initiate a jump is equal to 64MJ per cubic
meter per parsec jumped. This energy must be provided to
the drive in an hour or less (meaning that a starship must
have 0.018MW of power plant per cubic meter per jump
number).
Once in jumpspace, the jump drive maintains a small
bubble of real space around the ship, using power input to
the jump drive from the power plant (0.018MW per cubic
meter per jump number). The fuel remaining in the jump
drive's surge tank is used to create a thin hydrogen atmosphere
around the ship during jump, which helps to delay the
collapse of the jump bubble. If power to the drive is interrupted,
the bubble collapses, causing jump sickness, death of
crew members, misjump, damage, or destruction of the ship
(any or all of these, at the referee's option).
The section above starting with "Once in jumpspace,..." answeres the question.
Drop Tanks
Drop tanks are possible since the fuel is entirely consumed
before jumpspace entry, but drop tanks must be jettisoned
promptly so the ship can enter jumpspace before the tunnel
begins to collapse. The tanks must also be jettisoned so that
they will be far enough away from the ship so as not to interfere
with the jumpspace entry.
Gravity
Gravitational fields interfere with the alignment of the jump
drive. Ships do not usually jump until they're 100 or more
planetary diameters away from the nearest body. Otherwise,
a misjump may occur.
Jump Fuel
Jump drives require a large quantity of fuel to stabilize the
interface with jumpspace. As mentioned above, this fuel is
consumed before the ship actually enters jumpspace. The
fuel requirement is 10% of the ship's volume per parsec
(Equation 4: Jump Fuel). Jump fuel must be pure liquid
hydrogen, or a misjump may occur.
Equation 4 Jump Fuel
Jump Fuel = 0.1 x Jn x VolShip
See Table 4.
Minimum Size
The smallest hull that can safely enter jump space is 1,400
cubic meters.
Tom Rux