Hi Tom,

I should clarify that I actually agree with most of what has been said here, I just come to a slightly different conclusion.

To me, the limiting factor on the drive performance is the tech level, which determines the maximum jump achievable. After that, the size of the drive versus the size of ship it has to jump determines the actual performance. Hence the way jump performance fluctuates when drop tanks are added or dumped (High Guard p.27, for example makes clear that the actual drive rating changes depending on whether the drop tanks are present or not).

So, if your jump-4 drive was TL-13, it would never give better performance in a smaller hull. If it was TL-14, then it might give jump-5 in a smaller hull, if it was big enough and the power plant was at least factor 5.

Cheers,
Jim


On Sun, 6 Oct 2019 23:10 Thomas RUX, <xxxxxx@comcast.net> wrote:
Hello again James,

My understanding is that the drive rating is the maximum range. The 300 ton hull using a 400 ton hull J4 drive would make a four parsec jump using less fuel and if there was enough fuel for at a single one parsec jump then the hull would be sort of J5 capable.

Tom Rux
On October 6, 2019 at 11:39 AM "James Catchpole (via tml list)" <xxxxxx@simplelists.com> wrote:

Correction, to be clear I meant dropping the hull size may indeed give an improvement.

On Sun, 6 Oct 2019 19:37 James Catchpole, < xxxxxx@googlemail.com> wrote:
Hi Tom,

I would have to say no, that isn't the case.

In Book 2 of the LBB all the drives are standard and the performance depends on the hull size they are fitted into. The implication is that stripping such a drive from one hull and fitting it into a different size hull will give a different performance. 

Also, the performance rating of the LBB designs with drop tanks indicates that the same drive will give different performance depending on the current volume it has to jump.

Hope that helps.

Cheers,
Jim 

On Sun, 6 Oct 2019 19:15 Thomas RUX, < xxxxxx@comcast.net> wrote:

Hello all,


Back in when I picked up Traveller my impression, which was reinforced by the GM, has been that a J4 drive has a maximum range of four parsecs regardless of the hull size that it is installed in.


Can a J4 drive built for a 400 ton hull allow a 300 ton hull to make a five parsec jump?


Tom Rux

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