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T20 - Traveller for the D20 System Open discussion on the D20 version of Traveller!

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Old December 12th, 2020, 05:34 PM
Werner Werner is offline
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Default The Federation Campaign

This is a T20 Campaign based on warp drives powered by antimatter power plants. The warp drives are different from the Jump Drives in that they have variable speeds and those variable speeds have varied energy input requirements, generally higher speeds require higher energy inputs. There are three types of warp drives, Warp-1 with a warp range of 0 to 100c, Warp-2 with warp range of 0 to 500c, and Warp-3 with a warp Range of 0 to 2,500c. Now the thing to remember is that Warp 1, 2, and 3 are drives not speed factors, velocity is measured in multiples of the speed of light. (Although technically the ship is in a warp bubble and is not really moving at all, space is just contracting in front of the ship and expanding behind the ship, but as far as the layman is concerned the ship is moving at a multiple of the speed of light.)

Warp ships can change warp speed and direction while at warp, a ship can even warp at sublight speeds. The constraining factor is how empty the space is that the ship is warping through, if through a standard vacuum, a ship warps at a normal speed, if passing through a nebula, a ship warps at half speed, if within 100 diameters of a gravitational mass of 1 Earth density, the ship drops out of warps and must use a maneuver drive to travel within.

Jump Drives and Warp Drives
TypeTLCostSizeMassEPSpeedFuel
Jump-19MCr41 ton1.35 tons0.55 tons
Jump-211MCr61.5 tons2.025 tons110 tons
Jump-312MCr82 tons2.7 tons1.515 tons
Jump-413MCr102.5 tons3.375 tons220 tons
Jump-514MCr123 tons4.05 tons2.525 tons
Jump-615MCr143.5 tons4.725 tons330 tons
Warp-117MCr610 ton13.5 tons1/2/3/4/520/40/60/80/100 c
Warp-218MCr820 tons27 tons2/4/6/8/10100/200/300/400/500 c
Warp-319MCr1030 tons40.5 tons3/6/9/12/150.5/1/1.5/2/2.5 kc

Warp-1 Drive: Consists of Warp rings one at the bow and the
other at the stern of the ship, together, these warp nacelles
generate the warp bubble around the ship. Cost is Cr6, requires 10
ton of space, a variable supply of EP per round depending on warp
velocity. A Warp-1 drive requires 1 EP per round per multiple of 20
times the speed of light, thus when traveling from 0 to 20 times
the speed of light 1 EP per round is required, when traveling from
20 to 40 times the speed of light 2 EP per round is required, and so
up to a maximum of 100 times the speed of light. Not available
before TL 17.
Warp-2 Drive: Consists of Warp rings one at the bow and the
other at the stern of the ship, together, these warp nacelles
generate the warp bubble around the ship. Cost is Cr8, requires 20
tons of space, a variable supply of EP per round depending on warp
velocity. A Warp-2 drive requires 2 EP per round per multiple of 100
times the speed of light, thus when traveling from 0 to 100 times
the speed of light 2 EP per round is required, when traveling from
100 to 200 times the speed of light 4 EP per round is required, and so
up to a maximum of 500 times the speed of light. Not available
before TL 18.
Warp-3 Drive: Consists of Warp rings one at the bow and the
other at the stern of the ship, together, these warp nacelles
generate the warp bubble around the ship. Cost is Cr10, requires 30
tons of space, a variable supply of EP per round depending on warp
velocity. A Warp-3 drive requires 3 EP per round per multiple of 500
times the speed of light, thus when traveling from 0 to 500 times
the speed of light 3 EP per round is required, when traveling from
500 to 1000 times the speed of light 6 EP per round is required, and so
up to a maximum of 2500 times the speed of light. Not available
before TL 19.

Last edited by aramis; December 23rd, 2020 at 06:48 AM..
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Old December 12th, 2020, 07:20 PM
Werner Werner is offline
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Warp drives are bulkier than jump drives mainly because they form the warp bubble around the Starship and thus have to go outside the hull of the ship. In this setting, there is an extended period of sunlight exploration and colonization prior to the discovery of the warp drive. The tech level timeline is as follows:
1945 to 1969 Tech Level 6
1970 to 2029 Tech Level 7
2030 to 2099 Tech Level 8
2100 to 2179 Tech Level 9
2180 to 2249 Tech Level 10
2250 to 2319 Tech Level 11
2320 to 2399 Tech Level 12
2400 to 2449 Tech Level 13
2450 to 2499 Tech Level 14
2500 to 2549 Tech Level 15
2550 to 2599 Tech Level 16
2600 to 2649 Tech Level 17
2650 to 2699 Tech Level 18
2700+ Tech Level 19

The Federation was formed when it became possible to have Interstellar government, the invention of the warp drive created an era of expanding empires in which a number of systems banded together and formed the Federation for mutual protection against these expanding empires. Unlike star trek, many ships are of the 100 ton to 1000 ton range. Exploration crews tend to number from 1 to 50, the largest ships are freighters, passenger ships, and military ships. The large ships often carry smaller ships. Ships tend to drop out of warp when they get to close as the warp fields interfere with each other, and these warp fields extend out from the ship quite a bit, the most important reason is empty space is easiest to warp, a warp bubble usually contains about 27 times the volume of the ship, roughly an extra Ship's length in all directions, thus if a small ship gets close enough to a large ship, it can be carried away in the larger ship's warp bubble even if it is outside the hull of the ship, it is an engineering principle that one does not want any part of the ship getting too close to the boundary of the warp bubble as gravitational forces will cause damage to the ship, and if an objects drifts outside the warp bubble the ship will drop out of warp and the object that drifted will suffer damage from gravitational stress. To engage the warp, a ship much be more that 100 lengths from any other object, whether it is another ship, comet, asteroid or something else.

The maneuver drive was used for Interstellar colonization prior to the invention of warp, it is a reactionless drive, it only requires a fusion power plant operate, it can accelerate from 1 to 6-G for as long as the power plant has fuel and can provide the power input the drive needs, because of its minimal fuel requirements. A ship equipped with just a maneuver drive and a large fuel tank can reach a fairly significant fraction of the speed of light, there are also low berths available quite early one, so sleeper ships were often the most common sort of colony ship during this era.
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Old December 12th, 2020, 08:40 PM
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I don't know if this will help since it's not T20, but it is Traveller.

Traveller Prime Directive

If you don't know, Prime Directive is the Role-playing Universe for Star Fleet Battles - a miniatures game based on Star Trek.
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Old December 12th, 2020, 09:44 PM
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Quote:
Originally Posted by Spinward Scout View Post
I don't know if this will help since it's not T20, but it is Traveller.

Traveller Prime Directive

If you don't know, Prime Directive is the Role-playing Universe for Star Fleet Battles - a miniatures game based on Star Trek.
Kind of a new take on the Star Trek idea, but with more realistic aliens. Since it is T20, I think I will use the aliens from D20 Future. The Weren, the Fraal, the TSA, the Mechalus or Aleeren, they should be compatible with T20, toss in the Aslan, the Vargr and so forth. Humans have spread across space for 500 years, many colonies were established and many societies developed in isolation until the development of the warp drive brought them back into contact with each other. In the last 100 years there have been wars and conflicts as each society realizes the potential for Interstellar conquest now that an FTL drive exists, some of these societies have banded together and formed the Federation.

Can you think of other technologies that might fit it? Artificial intelligence, black globe generators are related technology to the warp drive.
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Old December 12th, 2020, 11:31 PM
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Quote:
Originally Posted by Werner View Post
Kind of a new take on the Star Trek idea, but with more realistic aliens. Since it is T20, I think I will use the aliens from D20 Future. The Weren, the Fraal, the TSA, the Mechalus or Aleeren, they should be compatible with T20, toss in the Aslan, the Vargr and so forth.

Can you think of other technologies that might fit it? Artificial intelligence, black globe generators are related technology to the warp drive.
The aliens you mentioned came from Alternity - converted to the d20 system. It changes things if d20 Future only uses Hit Points. T20 uses Stamina and Lifeblood if I remember right. It will have an effect on weapon damage and critical hits.

Equipment and aliens from d20 Star Wars and Starfinder should be closely compatible.

Here's the Starfinder System Reference Document. It could have some things you're looking for.

Also, here's the Starjammer SRD, which looks to be compatible with Starfinder.

These might have toys you'd be interested in. And they are mostly d20 compatible.
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Old December 13th, 2020, 09:24 AM
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Quote:
Originally Posted by Spinward Scout View Post
The aliens you mentioned came from Alternity - converted to the d20 system. It changes things if d20 Future only uses Hit Points. T20 uses Stamina and Lifeblood if I remember right. It will have an effect on weapon damage and critical hits.

Equipment and aliens from d20 Star Wars and Starfinder should be closely compatible.

Here's the Starfinder System Reference Document. It could have some things you're looking for.

Also, here's the Starjammer SRD, which looks to be compatible with Starfinder.

These might have toys you'd be interested in. And they are mostly d20 compatible.
Stamina is the same thing as hit points, they are used the same way in T20 as hit points are used in D&D, with increasing levels characters get additional die rolls of Stamina points just as they get hit points in D&D. Lifeblood is simply a way to counteract the increasing stamina points characters get at high levels. Star Trek seems to have better healing than your typical Traveller campaign, and I would expect at TL 19 for medical science to work faster at healing injuries anyway. I'm not sure whether there should be transporters or not, what do you think? I'm leaning towards not, not because some form of transporter is not possible, it's just that people don't trust them, they don't want to get disassembled and reassembled just to get transported from a ship to a planet's surface and back, most would rather take a shuttle if their Starship doesn't land.

There are two reasons not to land a starship in this campaign, for one thing the warp rings get in the way, they have to surround the Starship in order to work properly, and they would tend to compromise the streamlining of the Ship's hull since they stick out.

Another problem is the antimatter power plant, the antimatter that fuels it has to be stored somewhere, and antimatter tends to explode upon contact with matter. People do not want antimatter starships landing amidst their cities, which is why such ships stay in orbit and fusion powered shuttles are used instead. Antimatter is really only needed to power the warp drives of starships anyway, nonstarships with maneuver drives use fusion power plants instead.
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Old December 13th, 2020, 11:39 AM
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Quote:
Originally Posted by Spinward Scout View Post
I don't know if this will help since it's not T20, but it is Traveller.

Traveller Prime Directive

If you don't know, Prime Directive is the Role-playing Universe for Star Fleet Battles - a miniatures game based on Star Trek.
You may also want to look at its successor, Prime Directive d20 which is the redux of the originals. Their universe is slightly different since they can only use the Original Series, Animated Series, the ancient Star Trek Concordance book and the first movie. TNG and the rest do not exist, there. Given the times it reflects, both in universe, game theme and when it was written, it is a more martial game. So we are talking
The Federation details founding members, the Deltans, and a few others
"Errand of Mercy" Commander Kor Klingons. No ridges. Subject species, some LIKE the Klingons just the way they are.
Romulans
Tholians
Gorn
Kzinti (animated series)
Andromedans (from the TOS episode)
plus a few non-canon empires to round out ship designs
Supplements were made for additiona info on the big three.
Prime Directive PD20 Modern at DriveThru RPG
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Last edited by Nathan Brazil; December 13th, 2020 at 11:53 AM..
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Old December 13th, 2020, 12:12 PM
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I was thinking more of the general idea behind the television show rather than recreate the societies, and races of the series. Thi setting takes place in the 28th century to allow 500 years of isolated development history, and then the 100 years after that we have culture clashes and wars as the warp drive makes possible what was previously impossible. Most of the aliens were less developed than humans until contacted by them, so everyone is at approximately the same technological level. The Fraal are the exception, they stayed apart as observers until the humans developed the warp drive. The Fraal serve the same role as the Vulcans did in the Star Trek series, they are also known as the greys and sometimes as the "flying saucer aliens" their saucers have retractable warp rings that retract into the top and bottom of their saucer shaped starships, these are landable starships, the power source is a bit mysterious but its not antimatter. The Aleerans are altered humans, a cyborg race in otherwords.
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Old December 13th, 2020, 01:13 PM
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So, at 100c, Warp 1 is slower that Jump 1.

Jump 1 moves a parsec in 7 days, 100c is 12 days. Jump 3 is faster than 500c (barely).

Not until Warp 3 do they break through and get faster than J6.

Is there combat at Warp speeds?
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