AnotherDilbert wrote: ↑Sat Dec 01, 2018 8:55 pm

steve98052 wrote: ↑That's interesting; I'll have to take another look at its numbers. Does that include the translation between

*GURPS* and regular

*Traveller* technology levels?

Price is decreased by 50% per GURPS TL. Since there are more Traveller TLs it might be 33% per Traveller TL?

As I remember the

*GURPS* scale, one TL difference cuts the production cost in half, a second TL cuts it in half again, but after that the price doesn't continue dropping. The trade value doesn't follow the same scale; each TL adjusts the value by a ratio of 3:2, except for the top end of the scale, where it's 2:1, because top TL worlds are the only source for top TL products.

Because the

*GURPS* and regular

*Traveller* scales don't follow equal steps, the 33% rule wouldn't give matching results. Here's a chart of levels that matter for space vehicles, regular

*Traveller* left, jump in parentheses:

8 = 8 (no)

9, 10, 11 = 9 (possible, routine, Junp-1)

12, 13 = 10 (Jump-3, Jump-4)

14 = 11 (Jump-5)

15 = 12 (Jump-6)

To make the scales match, one could split

*GURPS* TL9 into early, middle, and late, and TL10 into early and late.

To convert the early, middle, and late partial levels seems to work best if they are calculated as fractional levels. Since half levels make the math smoother, TL9 could be split into 8.5, 9.0, and 9.5, and TL10 into 10.0 and 10.5 -- half steps from 8 through 11.

The production cost rule of 100%, 50%, 25%, stable, split into half levels, works out to 100%, 71%, 50%, 35%, 25%, stable.

The trade value rules of 3:2 doesn't split into half levels as a small number ratio, but it's not too far from 5:4, so that could be used for the final half levels after using the 3:2 ratio for whole levels. Since the top two levels are a full step, there's no need to split the 2:1 ratio between them.

Having two separate scales, for production costs and trade vales, is a complication, but how big a complication depends on what you're trying to use the rules for. I suppose the main purpose would be to price out a fleet (merchant or combatant) of ships built at an assortment of levels.