Converting FP and DF from Space 2e?

[DataPacRat]

I've got a statblock for a spaceship from an early edition of GURPS Space, and I'd like to compare it with some spaceships from other settings. Can anyone provide some rough rules-of-thumb to convert the old system's Firepower and Defensive Factor numbers into, well, anything else?


In case it matters, the ship is a slightly tweaked version of the speedster from GURPS Lensman, with the cosmic ray absorption screen shrunk to cover the ship's energy needs of 120 lbs/hr (that is, 1.3 petawatts, almost all of which is for the energy screens), with a one-tenth-normal sized Needler beam stuffed in, and a Meteor Shield explicitly statted in. Said needler has an FP of 20, the meteor shield has a DF of 1 vs matter, and the standard layered energy screens have DFs of 3, 5, 10, and 20.

For example, if I tried using GURPS 3e Vehicles' system to build a single force screen that's no heavier or larger than the combined generators for the layered energy screens, and making it large enough to enclose the 72-yard-long vessel, I get stats of around TL12 Force Screen Generator, FSR 72, Fast Recovery, Energy Screen, Compact: 18,662.4 lbs (9.3312 tons), 933.12 cf (34.56 cy), $37,324,800, 186.624 MW, DR 9600. I have no idea if that's even in the right ballpark, given how the Lensman setting is the source of the term "Lensman Arms Race".

[DataPacRat]

Originally Posted by DataPacRat

I've got a statblock for a spaceship from an early edition of GURPS Space, and I'd like to compare it with some spaceships from other settings. Can anyone provide some rough rules-of-thumb to convert the old system's Firepower and Defensive Factor numbers into, well, anything else?


In case it matters, the ship is a slightly tweaked version of the speedster from GURPS Lensman, with the cosmic ray absorption screen shrunk to cover the ship's energy needs of 120 lbs/hr (that is, 1.3 petawatts, almost all of which is for the energy screens), with a one-tenth-normal sized Needler beam stuffed in, and a Meteor Shield explicitly statted in. Said needler has an FP of 20, the meteor shield has a DF of 1 vs matter, and the standard layered energy screens have DFs of 3, 5, 10, and 20.

Aha; I used Google to search these forums instead of the built-in search, which let me look for "fp" and the like. I found a reference to Compendium II, which had the exact numbers I wanted.

As it happens, force screens of DFs 1, 3, 5, 10, and 20 equate to Vehicles DRs of around 100, 500, 2,000, 30,000, and 30,000,000. And FP of 20 could be a beam weapon doing 200d(10) (or 20d(100)) per turn.

... I'll admit, I'm not sure what in GURPS, outside of Lensman-grade weapons, could punch through a DR of 30 million. Time to start skimming Ultra-Tech, I suppose. :)