Book 4 - Abaddon's Gate

More of the Expanse !

It's quite a big series now. I think 7 books have been released and there are two more to come. I've just finished book 3.

I've really enjoyed the series so far. It's an excellent examination of future space politics, technology, warfare, culture and above all, keeps it about the characters.

And there are space bars too.

I wasn't quite so impressed with Abaddon's Gate as I was with the first two books though. Hopefully it wasn't a sign of the series running out of steam and I'll definitely be returning to this series soon.

The problem with it is that it goes on too long. The book tells of one catastrophe following another. Which is ok, some books work really well like that. But there comes a point where you think there should be no more and that the story should be wrapped up. Adding yet another twist in makes the book outstay its welcome.

And that's the feeling I got with this one. Maybe lose 50 pages from it.

Or that could be my bug addled mind not having the patience for it this time around.

What's next ? Dunno yet. We'll see. I need to read some of my Waterways World magazines at some point too. I have those in mind for filling one of the 52 book slots. But I did want to talk about the physics of these books and why they work.

This series doesn't indulge in inertial compensators like most scifi. It has an excellent engine .... but that's it. Acceleration is acceleration and too much of it is deadly. How deadly ?

We're constantly subjected to a downwards acceleration force of 9.81m/s/s. Call it 1g. We feel the world hauling down on us, we're used to it, we kinda need it sometimes too. I just took a swig from my drink, that 1g keeps the drink in the glass until its time has come.

When we're in the car, every acceleration is a fraction of a G ... despite what it feels like if you have a crazy driver. Working the numbers .... 0 to 60 mph (100kph to make it easy) in 5 seconds works out to a steady 5.56 m/s/s or just over half a G.

Spacecraft go at much higher G accelerations during the early launch and then settle down in the later stages. Peeking at some Saturn V Apollo stats :
Liftoff - 1.25g, ramping up to a max of 3.9g just before Stage 1 shut off;
The Space Shuttle peaked at about 3g;
Soyuz is under 4g.

And a lot of that is so that they don't break the people. Equipment can typically be subjected to much higher accelerations. So if you have something unmanned, it can be thrashed more. We'll come back to that.

In the Expanse, the people are subject to similar g limits depending on where they come from. Earthers are more sturdy due to being used to 1g. Mars are still quite sturdy, if I remember right Mars has 0.6g. The Belters grow up in typically 0.3g or lower so if they don't have muscle and bone supplements, they literally can't go to Earth or they will die, muscles, bones and heart crushed by the gravity. But they can withstand acceleration for a shorter duration.

But ... they can also juice up with steroids and antinausea drugs to withstand that acceleration up to maybe 15g before blood vessels start exploding in their heads. One of the core threads of Abaddon's Gate is a Slow Zone, where they have a maximum speed ... and are dead stopped when they exceed that. As in ... (quick mental math) 120m/s/s or 12g minimum without juice or acceleration crash couches. OUCH.

What does that equate to in, say, Star Trek ? Let's go to another scifi universe first ... The Honorverse talks about up to 500g, with inertial compensators to stop the crew becoming embedded in the bulkheads when they step on the gas.

Let's start with Warp 1 or lightspeed in Star Trek ... Light speed is 299,792,458 m/s.

We'll be generous and say they take 10 seconds to get there ... And then divide by 10 again for 1g = 9.81m/s.

Answer - Warp 1 from stop to c in 10 seconds is .... 3,000,000 g. 3 million g.

Squish !

The Expanse is a smaller universe so far to the point that I've read but they make it make a huge amount of sense. Another bit of silliness is the amount of energy required. The Kinetic Energy equation is 0.5 x Mass x Velocity x Velocity. So that's 0.5 x Mass (Enterprise D was 4.5m tonnes) x 300 million squared. That's a lot of zeroes. I gotta work this out now :-)

Kinetic Energy of Enterprise D at Warp 1 = 0.5 x 4,500,000 x 300,000,000 x 300,000,000 =
202,500,000,000,000,000,000,000 kJ (tonnes to kg conversion balanced by J to kJ conversion)
That would be a lot of GigaWatts to get the ship to warp speed.

And I'm now looking forward to reading more Expanse ! Maybe Rogue One Catalyst first though.

PS Still bugged, so I'll keep the physics book back a little bit.