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Old September 13th, 2011, 11:24 PM
cryingblackoil cryingblackoil is offline
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Default Air/Raft

Ok. Quick question. There has been some discussion about whether grav technology, specifically air/rafts, can function in deep space without a sizable chunk of mass like a planet to push/pull against. Any thoughts?
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Old September 14th, 2011, 02:23 AM
kilmore kilmore is offline
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I would say yes, as it appears that maneuver drives function without pushing against anything, and if I recall correctly, the maneuver drives work on grav principles. I'd say the gravitic energy is pushing against the ship / air-raft itself.
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Old September 14th, 2011, 03:39 AM
E.D.Quibell E.D.Quibell is offline
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In MT Air Rafts use Standard Grav Drives that push against a gravity well. If you use these on a space craft you lose 50% of you drive potential past 10 diamiters of the planet.

Thruster on the other hand can fit into anything over 20 tons push on themselves, so never lose dirve potential.

In MgT I have no idea though.

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Old September 14th, 2011, 05:45 AM
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Old September 14th, 2011, 07:31 AM
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MgT is based on CT, which, as far as I know, did not have this concept... certainly haven't come across it in any of the MgT books.

I think the authors intentionally left this vague in MgT - especially if one looks at air rafts.

IMTU, gravitic systems 'create gravity' as well as manipulate existing 'gravitic fields' - so no 'external' gravity is required. Of course, this seems less believable, especially for small devices like grav belts', which I suspect is one of the reasons for the other versions of Traveller to make a distinction. For myself, I make it simple and keep gravitics purely in a fictional realm, rather than trying to tie it to real life physics and perceptions - which just means more effort for no real gain, as it will utterly fail for those of us not more gifted than Einstein.

Like all handwaves, there comes the question of suspension of disbelief - but gravitics (gravity control, not gravity) is fantasy, not science.
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Old September 14th, 2011, 11:07 AM
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IMTU, grav only works in a planet's gravity well.

A CT Air/Raft has a rather weak grav system, so is more closely tied to a planet.

IIRC correctly, there was something in the CT description of an Air/Raft as "a light duty grav vehicle that uses null-grav units to counteract gravity for lift and propulsion." If there is no gravity to counteract, there is no propulsion, but there is always some. I describe it to my players as being not enought to work with outside 100 diameters, and halved by 10 diameters.


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Old September 14th, 2011, 11:57 AM
far-trader far-trader is offline
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Originally Posted by BytePro View Post
MgT is based on CT, which, as far as I know, did not have this concept...
Actually it does. As samuelvss notes, the CT grav vehicles can only make orbit, and only very slowly at that (except for the Speeder). Taking 1 hour per planet size digit. And orbit is as far as they can get before they are incapable of further thrust.

Ships and small craft on the other hand can make orbit in minutes and travel between planets at full thrust.

Two very different systems are evident and in use.

As you note, being based on CT, MgT should have similar notes and performance.

Originally Posted by BytePro View Post
I think the authors intentionally left this vague in MgT...
That wouldn't be my first conclusion
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