High Guard
to Traveller Fourth Edition (T4)
Conversion
Rob Flammang, one of the members of the Traveller Mailing
List, posted these rules back in February 1997. They
provide guidance for conversion of Classic Traveller Book 5
(High Guard) starship designs to T4 format ships as
designed by the QSDS rules in the main rulebook. The rules
are posted here as an unmodified html file - it is hoped to
format them sometime later to an Acrobat PDF. In the mean
time, thanks to Rob's kind permission, here is the solution
for everyone missing the simplicity of High Guard.
Well, I've been promising for a long time to post some
rules for the conversion of High Guard USP's to T4 USP's.
The advantages to using High Guard (and Book 2) to design
starships are:
1) it's easier than any of the methods currently in print;
2) you can actually easily design ships that are compatable
in price and capability with the ships listed in the T4
rulebook.
I've been lobbying for a HG-like ship design system for
nearly a year now. If you ever plan to resurrect High Guard
(or anything like it), Marc, feel free to use this system
or any system based on or inspired by it. It's all yours.
These rules are not yet complete (two items have yet to be
finished: meson screens and repulsers), but I figured I'd
go ahead and post what I had. Please, please, please send
me lots of advice and criticism.
Coming soon to a post near you: T4 USP's for:
Type A Free Trader
Type A2 Far Trader
Type R Subsidized Merchant
Type S Scout Courier
Type Y Yacht
The Patrol Cruiser
The Mercenary Cruiser
The Lab Ship
The Safari Ship
Ad Astra class Liners
Kinunir class Battle Cruisers
Unicorn class Close Escorts
The Gunned Gig
The Transport Pinnace
Lightning class Cruisers
Rampart class Fighters
The Armed Launch
The Fuel Shuttle
Zhodani Shiva class Patol Frigates
The Rock
The Pebble
Leviathan class Merchant Cruisers
Converting
from High Guard USPs to the new USPs in Marc Miller's
Traveller.
TONS
The T4 tonnage is the same as the HG tonnage. Take the
Tonnage USP value directly from the HG USP.
For the hull type, use the following table to go from the
HG configuration USP to the T4 USP:
HG USP T4 USP
1 Needle/AF
2 Wedge/AF
3 Cylinder/SL
4 Box/SL
5 Shere/SL
6 Dome/SL
7 Close Structure/No SL
8 Planetoid/No SL
9 Planetoid/No SL
VOLUME
Volume is equal to tonnage times 14. V = 14 * T.
COST IN MCR
Same for T4 as in HG.
CREW
Same for T4 as in HG.
PASSENGERS HIGH/MEDIUM
Same for T4 as in HG.
PASSENGERS LOW
Same for T4 as in HG.
CARGO
Should be listed in tons; same for T4 as in HG. If you list
it in
cubic meters instead, then multiply the HG USP for cargo by
14 to get
the T4 USP.
CONTROLS
For starships, Mil Std/Bridge. For small craft, Mil Std or
Mil
Std/Bridge if you include a small craft bridge. If the HG
computer USP
is A, B, C, D, E, F, G, H or J, then add "/fib" to the T4
USP.
TECH LEVEL
Same for T4 as in HG.
SIZE RATING
Use the table below to convert from the HG USP size rating
to the T4
USP:
HG size USP T4 size USP
0 7
1-9 8
A-J 9
K-Q 10
Q-X 11
Y 12
JUMP RATING
Same for T4 as in HG.
G RATING THRUSTER PLATES
Same for T4 as in HG.
POWER PLANT RATING
Same for T4 as in HG. To get the power plant rating in MW,
multiply
the power-plant USP by the ship's tonnage, and multiply
that by 2.5.
Power in MW = 2.5 * Tonnage * PP.
FIRE CONTROL RATING and SENSOR
RATINGS
I suggest getting these from the HG "computer" USP using
the following
table:
HGComp T4-fire-control T4-SensorUSP's (A P J)
0 0 0 0 0
1 1 2 2 2
2 2 4 4 4
3 3 6 6 6
4 4 8 8 8
5 5 10 10 10
6 6 12 12 12
7 7 14 14 14
8 8 16 16 16
9 9 18 18 18
A 1 2 2 4
B 2 4 4 8
C 3 6 6 12
D 4 8 8 16
E 5 10 10 20
F 6 12 12 24
G 7 14 14 28
H 8 16 16 32
J 9 18 18 36
R 1 2 4 2
S 2 4 8 4
ARMOUR
I show below two versions of HG-to-T4 armor conversion. The
first is
from the following official sources: HG to Striker, then
Striker to
FFS. But the conversion from HG to Striker, while official,
is also
very arbitrary. So I have substituted the arbitrary
HG-Striker
conversion with my own arbitrary and easy HG-T4 direct
conversion.
HG USP Official T4 conversion Easy T4
conversion
0 17 0
1 23 10
2 26 20
3 30 30
4 34 40
5 38 50
6 44 60
7 47 70
8 50 80
9 54 90
10 58 100
11 61 110
12 65 120
13 69 130
14 74 140
15 79 150
16 82 160
17 85 170
18 88 180
19 92 190
20 95 200
21 99 210
STRUCTURE
Get the T4 structure USP from the HG tonnage using the
following
table:
HG tonnage T4 structure USP
0+ 0
3+ 1
7+ 2
13+ 3
20+ 4
27+ 5
33+ 6
42+ 7
50+ 8
67+ 9
83+ 10
125+ 11
167+ 12
208+ 13
250+ 14
292+ 15
333+ 16
417+ 17
500+ 18
583+ 19
667+ 20
750+ 21
833+ 22
1,000+ 23
1,167+ 24
1,333+ 25
1,500+ 26
1,667+ 27
1,833+ 28
2,167+ 29
2,500+ 30
2,833+ 31
3,167+ 32
3,500+ 33
3,833+ 34
4,500+ 35
5,167+ 36
5,833+ 37
6,500+ 38
7,167+ 39
7,833+ 40
9,167+ 41
10,500+ 42
11,833+ 43
13,167+ 44
14,500+ 45
15,833+ 46
18,500+ 47
21,167+ 48
23,833+ 49
26,500+ 50
29,167+ 51
31,833+ 52
37,167+ 53
42,500+ 54
47,833+ 55
53,167+ 56
58,500+ 57
63,833+ 58
74,500+ 59
85,167+ 60
95,833+ 61
106,500+ 62
117,167+ 63
127,833+ 64
149,167+ 65
170,500+ 66
191,833+ 67
213,167+ 68
234,500+ 69
255,833+ 70
298,500+ 71
341,167+ 72
383,833+ 73
426,500+ 74
469,167+ 75
511,833+ 76
597,167+ 77
682,500+ 78
767,833+ 79
853,167+ 80
938,500+ 81
LASER BATTERIES
Use the table below to convert from HG laser-battery USP's
to T4
laser-battery USP's. Two T4 laser-battery USP's are given,
one for
beam lasers and another for pulse lasers.
HG USP - Pulse Lasers - Beam Lasers
1 2-1-0-0 1-1-1-1
2 3-1-0-0 2-2-2-2
3 4-2-1-0 3-3-3-3
4 5-2-1-0 4-4-4-4
5 6-3-1-0 5-5-5-5
6 7-3-1-0 6-6-6-6
7 8-4-2-1 7-7-7-7
8 9=4=2=1 8-8-8-8
9 10-5-2-1 9-9-9-9
PLASMA and FUSION GUN BATTERIES
Use the table below to convert HG plasma or fusion gun
batteries to T4
battery USP's:
HG USP T4 USP
1 3-0-0-0
2 4-0-0-0
3 5-0-0-0
4 6-0-0-0
5 7-0-0-0
6 8-0-0-0
7 9-0-0-0
8 10-0-0-0
9 11-0-0-0
MESON GUNS and PARTICLE
ACCELERATORS
Use the table below to convert HG USP's to the T4 battery
USP's for
meson guns and particle accelerators. These conversions
were made by
using the relationship between the HG size USP's, which are
linked to
weapon USPs, and the the T4 structure points.
HG USP Meson Gun Particle Accelerator
1 1-0-0-0 1-1-1-1
2 2-0-0-0 2-2-2-2
3 3-1-0-0 3-3-3-3
4 4-2-0-0 4-4-4-4
5 5-3-1-0 5-5-5-5
6 6-4-2-0 6-6-6-6
7 7-5-3-1 7-7-7-7
8 8-6-4-2 8-8-8-8
9 9-7-5-3 9-9-9-9
A 13-10-7-5 13-13-13-13
B 19-16-13-10 19-19-19-19
C 24-21-18-15 24-24-24-24
D 25-22-19-16 25-25-25-25
E 26-23-20-17 26-26-26-26
F 28-25-22-19 28-28-28-28
G 29-26-23-20 29-29-29-29
H 29-27-24-21 29-29-29-29
J 31-28-25-22 31-31-31-31
K 32-29-26-23 32-32-32-32
L 38-35-32-29 38-38-38-38
M 42-39-36-33 42-42-42-42
N 44-41-38-35 44-44-44-44
P 46-43-40-37 46-46-46-46
Q 50-47-44-41 50-50-50-50
R 52-49-46-43 52-52-52-52
S 58-55-52-49 58-58-58-58
T 62-59-56-53 62-62-62-62
SANDCASTER BATTERIES
Use the table below to convert from the HG USP to the T4
USP. The T4
USP is given for 3 tech levels.
HG USP TL-7 TL-8 TL-10
0 0 0 0
1 1 - -
2 3 1 -
3 6 3 1
4 8 6 3
5 10 8 6
6 20 10 8
7 30 20 10
8 - 30 20
9 - - 30
MISSILE BATTERIES
Use the table below to get the number of missiles that can
be
controlled in flight by a battery at any one time from the
HG USP
factor. Two columns are given for 2 different tech levels.
HG USP TL-7 TL-13
0 0 0
1 1 -
2 3 1
3 6 3
4 12 6
5 18 12
6 30 18
7 60 30
8 120 60
9 180 120
FORCE FIELDS
The flicker rate of the black globe is equal to the HG
force-field USP
time 10%.
NUCLEAR DAMPERS
Set the T4 USD equal to the HG USP plus 1.
And now for the two remaining problems:
REPULSOR BATTERIES
I do not know how repulsors are handled in T4. Despite a
cryptic
reference on page 72 of "Starships", there is no table of
them that I
can find.
MESON SCREENS
I do not know how meson screens are handled in T4. Despite
a cryptic
reference on page 75 of "Starships", there is no USP value
in the
table on p100 that I can find.
(c)1997,1999, 2005 Rob Flammang