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Air rafts and grav tech

At this point, we all call it air/raft because that's what the books all called it, and we want to avoid confusion because we're not all using the same book (CT, MgT1, 2, T5, TNE, etc) to refer to a thing that's ostensibly common between all the books. What an air/raft is, however, is a bit different depending on which book you're using, I've discovered.

At least in MgT1, the main book calls it 4T when as cargo on a spacecraft, though the price is different if you buy it a la carte (275kCr) or installed on a ship (600kCr). Now Book 1 didn't have hangars for small craft, so with MgT1 book 2 (High Guard), we could make one and maybe guess that the Book 1 ships with a 4T air/raft were including the hangar, though it was directly stated that this was not the case and in any event, the MgT1 HG cost would have been 800k for just a 4T empty hangar that would have allowed a 30m^3 air/raft (converted at the rate of 10m^3 per ton of space per dT per page 4 of MgT1 Supp 5 Civilian Vehicles), but in that book, air/rafts are .8T/8m^3, with a cost of 210kCr. I have no idea how it's broken out in Striker, so will stay away from CT comparisons.

The question I have, which I'm sort of looking for an official answer on, is which is correct, if either, and what are then the 'official' stats on an air/raft? In MTU, there are simply several different models of air/raft, which becomes a generic term like 'car' is today. But the idea that air/raft is a generic term and that there are many different models in different sizes and configurations is pure supposition on my part and implued nowhere in any source.

That said, in MTU, air/raft is a craft with full grav propulsion. You can make a craft much less expensively with grav lifter and flyer-jet propulsion for forward thrust. I borrow the term speeder for this, so one that flies becomes an air/speeder to use the same semantic construction. For about 280k, you can get a 30m^3 air/speeder with 1 full dTon of cargo volume, and it will do 400kph (same as a standard air/raft) with up to 5500kg/5.5 tons. Obviously, this only works in atmospheres with oxygen, where the full grav version works on any planet.

What sounds right from the name 'air/raft' is actually a craft with grav lifter propulsion, using the glider 'drive' (which can actually gives you thrust based on your power plant rating for no clear reason), but that won't work because even at 30m^3, with a pilot and 3 passengers, the top speed is around 160kph with the entire available space as power plant. So, maybe this was the original version of the air/raft, and when full grav drive was developed early in TL8, and the modern vehicle has kept the old name? Bonus that the lower top speed seems more raft-like.
 
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If in doubt go back to CT 77
"Air/Raft (8) CR 6,000,000. Also known as a flier, the air/raft relies on solid state null gravity modules for lift and propulsion. Four independent, individually replaceable modules (CR 1,000,000 each) insure a maximum of safety. Loss of one module reduces lift by one-quarter. The standard air/raft weighs 4 tons and can carry a payload of up to 4 tons including pilot and passengers. Cruise speed is 100 km per hour with unlimited range and endurance. Normally, air/rafts are open topped; the referee may allow a pressurized version or such options as gun mounts, searchlights, crash cushions or larger capacities at higher prices."

LBB:4 reduced the price to CR 600,000

then check the changes in revised edition:
"Grav Vehicles: Grav vehicles are the main transportation of a high technology society. Beyond tech level 10, other vehicle types are rarely seen except in a few specialized situations. All grav vehicles are essentially similar in handling characteristics, and air/raft skill allows its possessor to pilot any grav vehicle. The speeder is somewhat of an exception; if flown at or near its cruising speed, the pilot uses air/raft skill minus 1; if flown slowly (at the speed of an air/raft) there is no subtraction.
Grav vehicles work in any environment and are all capable of reaching orbit (eventually).

Air/Raft (8) Cr600,000, 4 tons. A light anti-gravity vehicle which uses nullgrav modules to counteract gravity for lift and propulsion. An air/raft can cruise at 100 kph (but is extremely subject to wind effects), with some capability of higher speed to about 120 kph. An airlraft can reach orbit in several hours (number of hours equal to planetary size digit in the UPP); passengers must wear vacc suits and interplanetary travel in an air/raft is nos possible. Range in time or distance on a world is effectively unlimited, requiring refueling from a ship's power plant every ten weeks or so. An air/raft can carry four persons plus four tons of cargo. The air/raft is unpressurized and usually open-topped."
 
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If in doubt go back to CT 77
"Air/Raft (8) CR 6,000,000. Also known as a flier, the air/raft relies on solid state null gravity modules for lift and propulsion. Four independent, individually replaceable modules (CR 1,000,000 each) insure a maximum of safety. Loss of one module reduces lift by one-quarter. The standard air/raft weighs 4 tons and can carry a payload of up to 4 tons including pilot and passengers. Cruise speed is 100 km per hour with unlimited range and endurance. Normally, air/rafts are open topped; the referee may allow a pressurized version or such options as gun mounts, searchlights, crash cushions or larger capacities at higher prices."

LBB:4 reduced the price to CR 600,000

then check the changes in revised edition:
"Grav Vehicles: Grav vehicles are the main transportation of a high technology society. Beyond tech level 10, other vehicle types are rarely seen except in a few specialized situations. All grav vehicles are essentially similar in handling characteristics, and air/raft skill allows its possessor to pilot any grav vehicle. The speeder is somewhat of an exception; if flown at or near its cruising speed, the pilot uses air/raft skill minus 1; if flown slowly (at the speed of an air/raft) there is no subtraction.
Grav vehicles work in any environment and are all capable of reaching orbit (eventually).

Air/Raft (8) Cr600,000, 4 tons. A light anti-gravity vehicle which uses nullgrav modules to counteract gravity for lift and propulsion. An air/raft can cruise at 100 kph (but is extremely subject to wind effects), with some capability of higher speed to about 120 kph. An airlraft can reach orbit in several hours (number of hours equal to planetary size digit in the UPP); passengers must wear vacc suits and interplanetary travel in an air/raft is nos possible. Range in time or distance on a world is effectively unlimited, requiring refueling from a ship's power plant every ten weeks or so. An air/raft can carry four persons plus four tons of cargo. The air/raft is pressurized and usually open-topped."
An interesting historical perspective. It seems the benchmark has never been stationary. The historical cruising speed is defintely more in keeping with the raft portion of the name. The slower lift speed to orbit is interesting, perhaps the grav engines that planetside vehicles use require a gravitational field to work with, where spacecraft thrusters don't?

One thing that the game has failed to note is that passengers in an open vehicle will require spacesuits or other environmental protection and breathing air above 3-4,000m on normal terrestrial planets.
 
The '81 version does say "An airlraft can reach orbit in several hours... passengers must wear vacc suits"
I am assuming that goes for the air/raft crew as well :)
 
I'm not sure if there's an iconic speed band for it.

Implied would be a skeletal frame, with minimal gravitational motors, controls, and power.
 
The question I have, which I'm sort of looking for an official answer on, is which is correct, if either, and what are then the 'official' stats on an air/raft? In MTU, there are simply several different models of air/raft, which becomes a generic term like 'car' is today. But the idea that air/raft is a generic term and that there are many different models in different sizes and configurations is pure supposition on my part and implued nowhere in any source.
It is absolutely the case in GURPS Traveller: Interstellar Wars, which lists several Terran and several Vilani models with different performance and price points.

Before then, TNE had several different models as well. The core rule book has a standard open air/raft (note that TNE has this as 'air raft' which no slash), made at TL10, using an MHD powerplant and HEPlaR thruster, displacing 2 DTons. It also has an enclosed air raft, TL12, 3 DTons. The Reformation Coalition Equipment Guide has a TL12 air raft that's open-topped and nominally 3 DTons, but which can have a seal 'lid' mounted, making it enclosed (still 3 DTons), using an MHD powerplant and HEPlaR. The Regency Combat Vehicle Guide had a TL15 'armed air raft' at 3 DTons, using a fusion plant and HEPlaR, fully enclosed. It also had a TL15 convertible air raft that, like the RCEG one, could have a lid fitted. It was TL15, 3 DTons, fusion powered (smaller than the armed air raft's) and using HEPlaR for thrust.

MegaTraveller had open and enclosed air/rafts (made at TL15, because of course they were).

So, firstly, there's no single 'official' air/raft, and secondly, there's no supposition - there absolutely are many different models in various shapes and sizes, and have been since at least MegaTraveller.

What sounds right from the name 'air/raft' is actually a craft with grav lifter propulsion, using the glider 'drive' (which can actually gives you thrust based on your power plant rating for no clear reason), but that won't work because even at 30m^3, with a pilot and 3 passengers, the top speed is around 160kph with the entire available space as power plant. So, maybe this was the original version of the air/raft, and when full grav drive was developed early in TL8, and the modern vehicle has kept the old name? Bonus that the lower top speed seems more raft-like.
The MT air/rafts are capped at 120 km/h, cruising at 90 km/h, much the same as CT. The TNE air rafts are very fast if they have hard tops or the users have protective gear (somewhere between 470-800 km/h at altitude, depending on model), but are capped at 300 km/h if open-topped and the crew aren't in suitable gear. The TNE numbers are higher than I think necessary - air/rafts make life easy enough for PCs already without giving them that sort of high-speed mobility. The standard models should be a flying truck or van, not a medium-lift helicopter replacement (for that you'd want a g-carrier with the armour stripped off).
 
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If in doubt go back to CT 77
"Air/Raft (8) CR 6,000,000. Also known as a flier, the air/raft relies on solid state null gravity modules for lift and propulsion. Four independent, individually replaceable modules (CR 1,000,000 each) insure a maximum of safety. Loss of one module reduces lift by one-quarter. The standard air/raft weighs 4 tons and can carry a payload of up to 4 tons including pilot and passengers. Cruise speed is 100 km per hour with unlimited range and endurance. Normally, air/rafts are open topped; the referee may allow a pressurized version or such options as gun mounts, searchlights, crash cushions or larger capacities at higher prices."

LBB:4 reduced the price to CR 600,000
It also reduced the price of ground cars, hovercraft, helicopters, grav belts, small steamships, and motor boats, all by a factor of ten. ATVs and AFVs got their price knocked down by a factor of 100! I get the impression there was a change in thinking around vehicle availability to PCs between the editions.
 
Going through Space Viking and also Four Day Planet, Piper adds air lorries and air cavalry mounts to the mix in Space Viking and air limousine and again air lorry in Four Day Planet. The closest to an air/raft would be the air lorry.
 
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