Thanks for all the work! So you're saying my mistake was in using "Fossil" then instead of other Stages? Given that errata I'd submit then the Fossil is misleading, especially since it is -2 to TL. I mean I can understand the reason for it, since we could have been working on electric cars for the past century on Earth instead of IC, imagine if we were on a world where fossil fuels were not abundant. But if it was a separate line of research or something, I'd make it so that you could add it to other stage mods. Perhaps now that this errata is there, we should also add in that that is allowed? And why is there the penalty to armor for Fossil anyway? (I get why it has less SoundProof, that's cool.) Maybe the default Motive TLs should be adjusted a bit as well. I know they are supposed to be when the tech becomes widely available, but if Fossil vehicles are going to be available two TLs ealier (maybe that should be just 1?), I have no problem with 'widely available' happening at "Early".
I wouldn't call it a mistake at all. I think with the Makers there are many paths to achieving the final design or product you want. With VehicleMaker I use the following procedure:
1). Come up with a specification. Use either a real world vehicle or set some design goals that you can work towards.
2). Use the VehicleMaker Fillform and design process.
3). Look at the final design and describe it based on the characteristics and components.
You may have noticed that there are no or very minimal descriptions on the components in VehicleMaker. I say this is because its up to the designer to interpret what they mean for a particular design.
Fossil is a good example. It drops the vehicle TL by -2. The "stuff" associated with it takes up 2 tons. It drops armor by -10 and Soundproofing by -10. Its not powerful or reliable enough to power lifters or grav.
Okay here are two possible interpretations of what that means:
Fossil: Internal Combustion Engine
This is probably what you thought of Murdoc. An IC engine powered by fossil fuels, specifically hydrocarbon distillates (gas/petrol or diesel). Its a common form of power pack at lower tech levels. Its major disadvantages are that IC engines are bulky, they require a big engine bay, a radiator, a gearbox to distribute power and a fuel tank, all of which take up two extra tons of volume. They are noisy and the vibration is hard to damp out (-10 Soundproofing). You can interpret the -10 AV as 1). construction techniques and materials at lower TLs are less damage resistant, or 2). Having a big tank of gas and a big engine block and radiator makes it more vulnerable to damage and more likely that a hit by a bullet will do damage. It does not generate enough electrical power to be used with Lifters or Grav.
Fossil: Steam Engine
Here's a different take. A steam engine used at lower TLs but can be refined to build steam cars and steam trucks. Its major disadvantage is the bulk of its fuel which is fossil based (either fuel oil or coal) and the requirement to have a steam generator or boiler alongside either a steam piston engine or turbine. The fuel bunker, boiler and piston/turbine add an extra 2 tons to any design. They are noisy and the vibration is hard to damp out (-10 Soundproofing). You can interpret the -10 AV as 1). construction techniques and materials at lower TLs are less damage resistant, or 2). Having a big container of steam and lots of piping makes it more vulnerable to damage and more likely that a hit by a bullet will do damage. It does not generate enough reliable electrical power to be used with Lifters or Grav.
Okay both of those descriptions of what Fossil is are perfectly valid but very different.
I find the detailed rules on p.500 very valuable for explaining when and if technology is available but they must be used in conjunction with the Technology Table on p. 504.
For example on IC Engines. The table says that Oil and Petrochemicals are widely available at TL5 so thats the Base Tech Level for IC Engines (and GroundCars). We'll have Improved IC Engines at TL6 and Ultimate versions at TL9 (computer controlled pneumatic valve types I assume). TL4 gives us Early IC Engines and TL3 Prototype IC Engines and TL2 Experimental IC Engines (This is about right for Christian Huygens engine which came along in 1673, its just a bit out on the TL Table.).
So a TL9 Ground Car will most likely have an Ultimate IC Engine under the hood, but it could have a Prototype FusionPlus plant or some form of fuel cell or rubberband drive. Its up to the designer to fill in this level of detail. Otherwise we assume that a TL9 GroundCar has an IC engine. Adding Fossil to that TL9 GroundCar does not stop it being an IC engine powered car but it rules out the possibility of FusionPlus or anything else. It tells us that this type of GroundCar is available at TL7 and has a big fossil fuel burning powerplant to achieve the same overall the performance as the TL9 version, but its bigger, noisier and less well protected or more vulnerable.
Its a bit like saying: "I want to produce a car with the same performance of my car in the driveway but I want to do it in Henry Ford's Factory in 1930". I can come pretty close to the same performance, but I'll need a bigger engine and overall what rolls off the production line might look like a hot rod, not a Model T or a modern saloon.
The thing I'm always preaching is don't be bound by the LongName a Maker spits out. Interpret it as suits your need.