Morning from Roy, WA Rupert,

In CT LBB 2 1977 p13 "the installed power plant must be of a letter type at least equal of the installed maneuver drive (the power plant letter may be higher than the maneuver drive letter)." The release of CT LBB 5 1979 changed the requirement per p. 23 to  "On any given ship, the power plant number must at least equal the higher of the jump drive number or maneuver drive." In CT Supplement 7 1980 the Express Boat p.9 "Power Plant: None. Jump drives carry power plant capacities and functions." CT LBB 5 1980 p. 22 repeats the requirements from CT LBB 5 1979. CT Supplement 9 1980 p. 12 indicates the design follows Book 2 rules which is CT LBB 2 1979. CT LBB 2 1981 p. 13 "A non-starship must have a maneuver drive and a power plant A starship must have a jump drive and power plant; a maneuver drive may also be installed, but is not required. In all cases, the power plant letter must equal or exceed either the maneuver drive letter or the jump drive letter, whichever is higher."

In CT LBB 2 1979 there is no reference to TL requirements. However cross-referencing CT LBB 2 1979 Jump Drive letter type to the Technological Levels on CT LBB 3 p. 11 a Jump Drive 4 Letter Type Bon a 100 D-ton hull appears to be allowed at TL 9. A Jump 4 Drive Letter Type D on a 200 D-ton hull is also possible at TL 9. A 400 D-ton Jump Drive 4 letter type H is allowed at TL 10. The 600 D-ton hull can install a Letter Type M J-4 drive at TL 11. 800 D-ton hulls installing a J-4 Drive letter type R is a TL 14 system. J-4 drives for 1,000 is Letter type V, 2,000 letter type Y, & 3,000 letter type Z hulls are TL 15. No 4,000 or 5,000 ton hull is capable of mounting a J-4 drive.

In CT LBB 2 1981 the only nod to Technology Level is the Computers table on p. 22. Per p. 14 a Computer's model number indicates the highest level of jump the model can handle. Further CT LBB 3 Technological Levels p. 15 indicates that Jump Drive letter types A through D are available at TL 9. At TL 9 100 and 200 D-ton hulls can install J-4 drives but they are limited to J-3 since the highest Computer model is 3. At TL 10 both a 100-ton and 200-ton hull can mount J-4 drives.

Tom Rux

> On 03/29/2021 7:12 PM Rupert Boleyn <xxxxxx@gmail.com> wrote:
>
>
> On 30Mar2021 0625, Phil Pugliese - philpugliese at yahoo.com (via tml
> list) wrote:
> > Interesting!
> >
> > And it's never been corrected?
> >
> > How many centuries (more than a millennium?) has it been since the
> > 'Type S'  1st appeared?
> >
> > It's only TL9 after all.
> By Books 1-3 it's TL9 (but they also allow jump-6 at TL12, so haven't
> been a good guide to spaceship TLs since the very early 80s). By book 5
> they are TL11 (for the Jump-2).
>
> MegaTraveller made them TL15, because they couldn't fit everything in
> otherwise (gone is the unallocated empty space from the CT version),
> which you'd think would've suggested redoing the design rules, but
> apparently not (good one DGP). TNE retained this (which I think was a
> mistake in an otherwise good set of ship design rules), though it gained
> a good deal of cargo space compared to MT, so you could probably do a
> workable Type-S at a lower TL - Traveller 4 used a design system based
> on TNE's and managed TL12.
>
> GURPS Traveller used (GURPS)TL10, which translates to TL12.
>
> MgT has a Type-S as TL12.
> Overall, the Type-S seems to be considered to be TL12 in most versions
> of Traveller.
>
> As far as I know the crappy air system is a 'feature' dating to
> Supplement 7, dating to 1980. Supplement 7 is weird. It's where the
> X-Boat comes from too, and that means the X-Boat needs no power plant
> (as it write-up indicates), and that means it should have a huge amount
> of empty space, yet its described as cramped and having only ten days
> life support.
>
> --
> Rupert Boleyn <xxxxxx@gmail.com>
>
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