A medley of missiles

DFW said:
Not according to the description you posted: "no electromagnetic energy, including visible light, can pass through a Portal... "

IR is part of the EM spectrum...
True re: IR's nature but I was wondering if the reason EM energy can't pass from one side of a Portal to the other is because it's being absorbed/shunted by the portal management system as a result of the energy dampening effects.

Otherwise, people would have problems passing through the Portal since the brain (and the rest of a living body nervous system) works off of the flow of electricity as well as biochemistry.
 
SSWarlock said:
True re: IR's nature but I was wondering if the reason EM energy can't pass from one side of a Portal to the other is because it's being absorbed/shunted by the portal management system as a result of the energy dampening effects.

No, in order for that to occur the energy would have to pass through to the other side. Otherwise it just stays in the current space. Energy has to be on one side or the other. There is no in between "space". If it was absorbed it would have to go somewhere. The only "somewhere" is the other side of the portal.

As far as electricity goes, you can't run a wire through the portal and flow electrons across. It says nothing about a battery not going through. There is a difference.
 
Captain Jonah said:
Just send a small very stealthy drone through and relay them to report back every so often or under certain pre programed events.

The drone will still show up like a campfire on a light-less plain. ANY unexplained light source(s) cruising around the system are going to bring on the "police".
 
One thing wonders me. The shockwave missle. After the text in the rules it makes a magnetic pulse. or for real world termeni an EMP. and it does only to glue the sand from the sandcaster? And provit to use it for one round?
 
While you will have to have a hot side on the ship, you should be able to point it in a low risk direction, such as perpendicular to the ecliptic of the system.

Also, it should be possible to manipulate the emissions to be similar to an innocuous piece of space junk, like an asteroid.

Thirdly, the inverse square law is your friend. *Everything* radiates waste heat, and the further away you are from those trying to find stuff, the fainter you'll be and the more brighter emssion sources they'll have on their plate.

And as one last trick, Traveller does have a near perfect stealth technology - the black globe generator, though per previous points it's impossible for it to operate indefinitely or the waste heat build up will cook the ship (indetectably, mind you...) until something goes snap and it shuts down in a blaze of emissions.
 
Not to mention, space is huge. Reliable detection would require not only dealing with massive amounts of data of extreme detection criteria (TL can handle that), but widely dispersed detectors - especially for handling situations where an intruder does not want to be 'seen' (i.e. hides behind local objects or even ships from the point of view of the detection systems).

This and actually doing something about a detection are subject to the STL setting of Traveller. Detection takes time! Consider, in our own system, it takes light ~ 20 to 40 minutes to reach Jupiter. And about four to six hours to reach Pluto.

That is just the detection and communication delay - as intercepting vessels need to be 'close' enough to be useful. Even if extremely high power weapons at near light speeds can be used, the situation becomes quite untenable, very, very quickly.

All, in all, getting away undetected is hardly a deterrent to piracy. The biggest deterrent will just be limiting space travel to defensible regions within a system. Between solar bodies, this would mean something like patrolled space transit corridors - which, still, by and large, would be subject to the potential for successful pirate raids.
 
The Ancient installation in the Pocket automatically determines energy levels at the site of each portal and alters the energy of all objects passing through a Portal to match that of the receiving Portal...

Velocity reduction effects slow everything traveling at greater than 100 meters per second to that speed. As a result, no electromagnetic energy, including visible light, can pass through a Portal...

Electronics connections are also severed by a Portal. Wire connections simply cease to function.

Ugh. Remind me not to go through one. That's gonna do some serious stuff to the fastest bits of your nervous system....

If a photon can't go through the portal, it would have to be reflected away (the portal would have a mirrored surface) or else shunted by the portal itself into the energy sink as heat.

I don't have the original, so can't say how it was described, but there must be some way of absorbing 'rogue' energy, because the kinetic energy associated with something entering the portal at 200m/s has to go somewhere.

Assuming the object leaves at the proper speed it's clearly not going out as kinetic energy unless the object loses some mass somewhere.

If it was absorbed it would have to go somewhere. The only "somewhere" is the other side of the portal.
Not necessarily. It could be absorbed in the act of passing through the portal - there's no in between but there is an instantaneous discontinuity, which must be the point at which you spontaneously lose velocity relative to the portal. If it can absorb that and shunt it to a planetary heat sink, why not an IR photon?


That said, if you've got access to ancient technology, I don't think this is a terribly relevant conversation - this sort of technology essentially allows you to tell the laws of physics to sit down and shut the hell up.

1) The no-energy-passing-through is a feature of trying to match the entrance and exit velocities to 100m/s. Take away that requirement (if you're not bothered about what happens to the stuff you dump, unlike a transport system) and you can dump heat, light and used coke cans somewhere in interstellar space with impunity.

2) As noted, stay on the other side of the portal and peek through with a densitometer or a sensor with attached recorder that you 'hoist' through every so often, record a few seconds, then withdraw and read. The sensor doesn't need to manouvre or radiate itself as such (one would assume that as described the portal wouldn't)

3) The jump capability of ancient tech is (at least as demonstrated in the secrets of the ancients so far) good enough that you can be as accurate as you like, and the 100D limit is only relevant in that it's the point where everyone else is going to be. Skipping directly into a planetary shadow is probably going to be very easy.

4) It's ridiculously difficult, but you could take the comment about a 'hot' side to its logical extreme - if the narrower the radiating arc, the more intense the radiated power, so you end up with a narrow arc of intense IR radiation.

At its ultimate level (i.e. with ancient technology...) it's feasible that your heat sink starts to resemble a continuously firing, exceptionally high powered IR frequency laser, with an arc narrow enough that you can hide it by pointing it....well....anywhere, really. The odds of a randomly aimed laser beam intersecting with another important object in a system are as near to zero as makes no odds.

One thing wonders me. The shockwave missle. After the text in the rules it makes a magnetic pulse. or for real world termeni an EMP. and it does only to glue the sand from the sandcaster? And provit to use it for one round?
Never made entirely clear, but it's possible that 'sand' is magnetic in and off itself (i.e. not actually what we'd think of as sand), since sandcutter rounds (flung magnets) do pretty much the same thing by the same means.
 
locarno24 said:
If a photon can't go through the portal, it would have to be reflected away (the portal would have a mirrored surface) or else shunted by the portal itself into the energy sink as heat.

You have to think outside the visible EM spectrum.
 
If no EM radiation can pass through, then either it's absorbed by the portal mechanism or reflected, but if it's reflected then it'll appear mirrored, because it'll be reflecting everything - visible, IR, radio, UV, x-ray, gamma, the works.

However, the only bit of this you actually see is the visible, hence you get a perfectly reflective 'surface' at the portal interface.
 
locarno24 said:
If no EM radiation can pass through, then either it's absorbed by the portal mechanism or reflected, but if it's reflected then it'll appear mirrored,

Not necessarily. Some surfaces reflect UV as a visible wavelength. Some reflect visible back as IR, etc. Hence, my earlier comment...
 
Thanks Captain Jonah! The DARPA site is always a good place for such gems...

In the past, I've also found treasures at:
http://www.lanl.gov/
https://www.llnl.gov/

The U.S. SBIR/STTR related web sites also can provide useful RPG fodder...
http://www.acq.osd.mil/osbp/sbir/solicitations/index.htm
http://www.sbir.gov/solicitations/

(The latter two can also be a great lead on income ;) )
 
BP said:
All, in all, getting away undetected is hardly a deterrent to piracy. The biggest deterrent will just be limiting space travel to defensible regions within a system. Between solar bodies, this would mean something like patrolled space transit corridors - which, still, by and large, would be subject to the potential for successful pirate raids.

Absolutely. I actually think the best approach to piracy (which has much historical precedent) is stealth by disguise. Either using a common ship type such as a scout or free trader for piracy, or having the ability to disguise your emissions to *look* like one will work.
 
A good assumption - if nothing else, after loading down your holds with ill-gotten booty, you still have to go somewhere and sell it or you're not achieving much.


Another suggestion for piratical types is the gas giant - a nicely turbulent and thermally active atmosphere to hide in, a continuous source of fuel (so indefinite endurance for a ship as long as the rations hold out), a position some distance from any system's mainworld and yet somewhere that a trader is likely to visit - indeed is more likely to visit in the case of obscure backwaters that won't have the highport infrastructure to refuel a big ship.

Plus it's significantly bigger than a rocky planet - it's not hard to believe that someone who knows the system couldn't jump into its shadow relative to the mainworld.

Of course, system navies aren't always commanded by idiots, so the gas giant becomes a prime area for SDB patrols, but once you've dropped into a jovian's upper atmosphere, looking up, it's a lot easier for you to see them than for them to see you.

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Yes, some GGs are quite hot on their own and have lots of radiation to scramble sensors without the need of the pirates doing anything fancy. Not a safe neighborhood in a system that is poorly patrolled.
 
Not to mention that (at least with the two examples we have to go on!) you can get quite a complex moon system - making local space even more confusing to track, and increasing the possibility of something devious - a lot of moons will complete a significant portion of their orbit in the 1-6 hours plus day-or-so of fuel processor running time that a ship is likely to spend in orbit fuelling up, giving you something either to hide your approach behind, or to put a remote sensor either on or in orbit of.
 
Not only is it a good location for 'hiding' and stealth attacks, it also serves plot fairly well, since long duration stays in the EM and thermal extremes of a Jovian near space environment will wear hard on crew and ships...

Excellent reasons for eye patches and that unhealthy pirate look (hair and tooth loss from impaired immune systems). :)

(Last month I had the pleasure of seeing first hand the UVS payload for the JUNO project - the extreme environment around Jupiter requires the instrument, which will already be mounted in the probe's radiation box, to have highly unusual shielding and even the normal white teflon tape that wraps most space instrument cables is way to conductive for use on this mission...)
 
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