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Old September 2nd, 2011, 10:35 AM
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Default Tractor/Pressor Array

I found this while rummaging through some ancient notes of mine for my ongoing convert-to-digital project for MTU. Amazingly cringe-worthy artwork accompanied it but I won't submit you to that. Anyway I think the original idea was sourced form some old article from God knows where so if I'm infringing I apologize in advance. But I do know I've refined it like so many house rules are to get it to work better IMTU so here you are:

Tractor / Pressor Arrays TL-10+

An extrapolation of repulse technology designed to attract as well as repel an object with a tightly focused beam instead of a “wall”. The array is first developed at TL-10 and further advances increase efficiency to allow for affecting larger masses. Ship mounted arrays are used by tugs, rescue craft, and some types of warships. Ground arrays are used to help landings of craft too large for normal in-atmosphere operations or in asteroid belts for mining operations.

Craft dedicated to use of these devices often have secondary and tertiary power sources to bring online if increased power if needed. When actively maneuvering while another object is held by the array’s beam the combined mass of both craft must be taken into account for determining maneuver G’s and agility. Secondary drives may be used to maintain maneuvering acceleration, but usually only tugs and rescue craft have this capability.

Because the array is more efficient with larger masses than smaller, the lowest size target that can be “hit” with the beam is 50 tons; anything smaller won’t allow the beam to “stick”. The maximum range of a beam is Short and the target will be moved at 1.5G (this is enough to lift the ship off most worlds safely as well as provide the resistance needed to land them on size 8 (-) without problems) while under the influence of the beam. Multiple arrays from multiple sources may be combined to increase the power of the beam in order to target masses larger than the individual beams would be rated for. For example 2 Code D Bays could be combined to affect up to 2000 tons, or 2 Code G ground facilities could be used to help land a 20,000 ton ship.

CODE Tonnage Turret/Bay? Max Mass Price (MCr) TL

A 5 Dual Turret 200 5.0 10
B 10 Dual 400 10.0 10
C 15 Triple 600 15.0 11

D 50 50 Ton Bay 1000 20.0 12
E 100 100 Ton Bay 5000 25.0 13

F 500 Ground Fac. 5000 100.0 12
G 1000 Ground Fac. 10,000 150.0 13


Energy Point cost:

Pulling (or holding locked in beam) = 5% of target mass x target’s acceleration
Repelling (or as landing cushion) = 10% of target mass x target’s acceleration

To hit = 8+ on 2D6 DM’s= difference in computer sizes
-target’s agility
(This to hit roll is only used for when the device is used in combat to capture an enemy craft...most commonly this is to "grab" and slow down a smuggler or some such ship trying to evade a revenue cutter and just shooting up the target isn't desired.)

When a turret size is indicated that means the entire turret is used for the single array, i.e., a triple turret is only going to have one Class C Array.
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Old February 3rd, 2012, 07:32 PM
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How fast can they switch modes? I.e. can they be used in "landing mode" after the vessel has been brought in to hold it stationary in mid-air? To do that would require the ability to switch from push to pull to push very quickly.

What is the reasoning behind the 50Td limit? That seems awful high to me, as even at a 1:1 volume/density (water, iirc), you are looking at 675m^3 ~ 675 Tonnes. Since it has a hard time grabbing smaller masses, I would suggest having it hit on a 12+, with a mod of -1 per 10Td.

The power formula is nice but does it mean to include the 1.5g accel imparted to the target as well? And did you intend for the same amount of power to impart identical acceleration regardless of displacement of the target? Essentially, if I grab a small planetoid, and somehow have the power, I can tow it with my 50Td smallcraft? Even though it well out masses me and is significantly more displacement? Yes you put tonnage limits in there but limits are meant to be ignored- ask any pc.
Also- I presume target accel is in g's but it's not stated definitively. Hopefully not in m/s/s?

Why is it more expensive to push rather than pull? That I don't get.

Back to Td issues, a 50Td ship grabbing a 600Td ship and pushing it around kinda breaks a few physics rules doesn't it? Maybe if the smaller had 6g drives and the target had less......

Not trying to nit pick here- devious players and all that. figure out how to break the rules first and you can prevent the little bast....i mean those wonderful pc's from breaking them for you
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Old February 4th, 2012, 05:40 AM
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Just as an aside, Tractor beams are canonical - They're in MT.

100Td Bays MCr40, EP=200, Mass=70
TL16 UCP=2 Max=Near (Planetary)
TL17 UCP=4 Max=Far (Far Orbit)
TL18 UCP=6 Max=Far (Far Orbit)
TL19 UCP=7 Max=Far (Far Orbit)
TL20 UCP=8 Max=Far (Far Orbit)

50Td Bays, MCr35, EP=100, Mass=35
TL20 UCP=3 Max=Far (Far Orbit)
TL21 UCP=5 Max=Far (Far Orbit)

They pull UCPx10,000 Metric Tons; this approximates UCPx1,000Td for the high-guard wonks (but figure armor tonnage should be x10, probably more for high tech armors, and fuel tonnage x1/10, just for rough comparson)

UCP's from MT RM p.72; ranges from MT RM pp.90 & 93; allowed mass from MT RM p.95. EP figured from MT MW, at EP=MW/250
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Old February 4th, 2012, 08:23 AM
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They are also in TNE and T4 - although their order of discovery is reversed, tractors first then repulsors.

They are turret mounted IIRC - have to go dig out the books to check.
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Old February 4th, 2012, 02:07 PM
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Quote:
Originally Posted by mike wightman View Post
They are also in TNE and T4 - although their order of discovery is reversed, tractors first then repulsors.

They are turret mounted IIRC - have to go dig out the books to check.
Only mention of them I can find in TNE core is in the skill section. (p.120) But since it wasn't released free, I don't have the FF&S PDF to check it.
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Old February 5th, 2012, 10:04 AM
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Quote:
Originally Posted by aramis View Post
Only mention of them I can find in TNE core is in the skill section. (p.120) But since it wasn't released free, I don't have the FF&S PDF to check it.
FF&S p59, Tractors from TL-12, Repulsors & Manipulators from TL-16.
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Last edited by Starviking; February 6th, 2012 at 09:37 AM.. Reason: Closed quote tag
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