I came here because I was asked for solutions, Soban. Solutions are usually grounded in actual need. SARP has shot itself in the foot for more than a decade with values Wes chose because he wanted to statistically +1 the super-high numbers of other settings.
Everytime I've managed to implement some change, it was a downgrade meant to be staggered, because going back to an ideal value was too far off the left field to previously written roleplay. I couldn't fix it then. But I do know it's fixable now because I've proven to myself during my current scenario that it works.
But no, I'm not wildly inconsistent with SARP. As was historically proven (because I'm now that old, yick), SARP has for a long time just been wildly inconsistent with itself and pretended it wasn't. I'm just no longer keen on humoring it.
But there's no sense in saving SARP from itself if it doesn't want to be saved. Then, that is its own business. I'm not asking for anyone's permission; I'm just providing knowledge. If you don't deem it useful to you... well, the phrase that crop to my mind is
sucks to be you. That's not me trying to be mean, it's just me being very... unfiltered. Like I said: beyond this attempt (and this post may be the last in that vein) to help with this topic... I kind of don't care what you do with it..
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Humankind designs stuff that works, and due to resource scarcity, we rarely design in order to overkill. If our objective is to leave Earth to reach the moon, there's actually very little reason to make an thrusters that will propel you. As I mentioned before:
So, by extrapolation, humanity's propulsion technology needs to have advanced to having conventional engines capable of going at a minimum of at least 8kps (28,800 km/h) to deal with an Earth-like environment; and upward to 60kps (216,000 km/h) in order to safely maneuver around the gravity wells featured by all planetary bodies in the Sol system. Reaching and surviving the G-forces implied by the accelerating to such speeds fall under the umbrella of technology relating to life support and gravity control systems.
60 kps accounts for going everywhere around Sol. Like, cross-country, baby!
But the truth is that a freighter going from Earth to Mars doesn't need thrusters that can do much more than escape Earth's gravity and then in turn escape Mars' gravity (0.376 G). Therefore, a civilian freighter with thrusters capable of propelling it at 8kps would be amply sufficient. Even if that freighter would need to maneuver extremely carefully around Jupiter... it actually doesn't need to. Nor should most civilian captains even worry about exceeding Jupiter's gravity because you'd usually just steer clear, or have no business being there.
Regarding combat, nor should that matter much. At 60kps, lasers will hit you. Railguns going at a fraction of c (even 0.05c) will probably get you unless fancy flying is involved. And most missiles will go much faster than 60kps since they don't have to worry about keeping anyone inside alive, and will have hideously unfair power-to-mass ratio advantages (think 315+ kps). So, a civilian has few reasons to invest in better thrusters (investing meaning "spend cash") and spend more fuel than he actually needs to. So, most of the time, civilian access to better equipment like that is limited.
Not that it's impossible, but it likely has something to do with permit and whatnot. A civilian exploration vessel might need those better engines, but they might be chartered with support from the government. Not saying that civilian exceptions won't happen (homebuilt engines, salvage, overclocking, competition flying, etc...)
Otherwise than navigating, military craft do have a good reason for getting the better engines, and it's for aggressive positioning and catching up with other people to intercept or overtake (police cars have better specs than normal cars). The military is pretty big on projection of force, so it matters to them, and their budget it really not on the same scale as civvies.
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All done. Have a good one.